Are clams brachiopods.

Are clams brachiopods "The supposed replacement of brachiopods by clams is not gradual and sequential. We would like to show you a description here but the site won’t allow us. The resemblance, however, is quite superficial. May 3, 2021 · This brachiopod fossil was found in the Kaibab Formation and is 270 million years old. Morphology. Oct 20, 2023 · Brachiopods are similar to clams (bivalves, or two-shelled), except that the top and bottom shells of brachiopods are not identical, though the shells have symmetry when viewed from the top (“front” view below) and bottom, and along the edges from the front and rear shell seams. Brachiopods appear in the rock record as early as the Cambrian. The upper and lower valves of a brachiopod shell are unequal in size and shape, with the lower valve being larger and more convex. If you draw a line down the center of a brachiopod valve, the two halves are mirror images. Brachiopods are marine filter-feeding animals with two shells that hinged at the centre of the back. Jul 28, 2021 · Whereas in most clams the shells are wing-like mirror-images of each other, in brachiopods they are differentiated and correspond to the top and bottom of the animal. Oct 7, 2024 · According to Claus Nielsen’s (1991) ‘brachiopod fold’ hypothesis (later adapted by Cohen and colleagues in 2003), brachiopods are descendants of an ancestor similar to Halkieria, a small, slug-like animal. 3. The hypothesis proposes that the first brachiopod folded the rear part of its body under its front, giving rise to the paired valves. Jan 5, 2023 · Brachiopods still exist today, but are much less common than clams (bivalves) and very rarely found as seashells on the beach. e. Brachiopod valves are hinged at the rear end, while the front can be opened for feeding or closed for protection. Brachiopods superficially resemble clams but are not closely related to our modern sea shells. Paleozoic brachiopods - calcite 2B. 1. Clams (Pelecypods) have uneven-shaped shells, but both top and bottom halves are identical. Brachiopods. 15. Mollusc shells, like clams, are divided between left and right, while Brachiopod shells are divided between top (dorsal) and bottom (ventral). In conclusion, the examples from the provided list that are part of the Mollusca phylum are clams and snails. One of the biggest mass extinctions of all time killed off most species of Brachiopods 250 million years ago. Jan 8, 2008 · Brachiopod shells superficially resemble clam shells. Because Brachiopoda morphologically resemble clams, they have long been classified as Mollusca. While they may all look the same to us, during the Paleozoic era (roughly 250-500 million years ago), brachiopods ruled the sea. [3] The upshot was that bivalves took over the desirable inshore habitats. 6: The most common fossils in Ordovician rocks are the brachiopods. Brachiopods and bivalves belong to different phylums. Branchiopoda, from Ancient Greek βράγχια (bránkhia), meaning "gill", and πούς (poús), meaning "foot", is a class of crustaceans. , Freshwater habitats are where the free-living flatworm called lives. 3 Brachiopod Paleoecology ← –– 1. , One of two basic body forms of cnidarians, the _____ is typical of the Hydra, with the mouth directed upward. Aug 30, 2024 · Brachiopods are marine invertebrates with hard shells on their upper and lower surfaces, resembling clams, but are distinct due to their unique internal structure and ancient lineage dating back over 500 million years. Brachiopods Resources Brachiopods, or lampshells, are a phylum of small marine animals with a two-valved shell that, at first glance, resemble bivalved mollusks such as clams. Annelid segments are divided from one another internally by _____ septa. And they are sometimes confused with other shelled animals, like clams, because they look so much alike. Brachiopods have a distinct evolutionary history and anatomical features. Note that sampling as estimated here is a heterogeneous Study with Quizlet and memorize flashcards containing terms like Select all of these that are features of the lophotrochozoans. Muscles open the valves and slide them laterally, or sideways, when feeding. Brachiopods are also part of a larger group of organisms called lophophorates, all of which have a special organ called the lophophore. Brachiopods, or lampshells, are a phylum of small marine animals with a two-valved shell that, at first glance, resemble bivalved mollusks such as clams. Brachiopods attached to the sea floor in various ways. Figure 4--Contrasting symmetries in brachiopods and clams. Although they resemble clams, brachiopods were a different group of animals. In this way they resemble clams, but their soft-part anatomy differs considerably from that of clams. Brachiopoda is a phylum within the Lophotrochozoa. Commonly called "lamp shells," brachiopods are two-shelled marine organisms that have existed since the Cambrian period. Study with Quizlet and memorize flashcards containing terms like Almost all bilaterian animals belong to either of these clades: and . Brachiopods have a larger ventral shell (pedicle valve) and a smaller dorsal shell (brachial valve). Brachiopods are more closely related to Bryozoans than Mollusks. Bivalve page to learn more about differences between the two groups. Brachiopods What's the Difference? Bivalves and brachiopods are both types of marine animals with two shells that are hinged together, but they belong to different phyla. " Lamp shells, any member of the phylum Brachiopoda, a group of bottom-dwelling marine invertebrates. These lophophorates are characterized by their sessile lifestyle, using a stalk-like pedicle to anchor to the substrate, and Mollusc shells, like clams, are divided between left and right, while Brachiopod shells are divided between top (dorsal) and bottom (ventral). Brachiopods have no gills and instead use their lophophore to both eat and breathe, which seems to support a much lower metabolism. Today, they don't do Phylum Brachiopoda (Cambrian to Recent) Brachiopoda is a phylum of marine animals whose soft bodies are enclosed by a shell consisting of two halves (valves). Notice the switch in dominance at the Permian Mass Extinction (252 Ma). Some brachiopods have prominent spines, but these are usually broken off and are found as separate fossils. The most common seashells at the beach today are bivalves: clams, oysters, scallops, and mussels. -Marine, freshwater, and terrestrial -Terrestrial and Brachiopods are marine shelled invertebrates that look superficially very much like clams. They are the second-most common seashells in the world today behind their cousins, the gastropods (snails). Inasmuch as their valves are seldom similar, the plane of symmetry that divides the animal into mirror-image halves passes vertically down the middle of each valve (left drawing, "Bilateral symmetry (brachiopod)"), and is perpendicular to the line along which the valves join. Brachiopods are commonly called "lampshells" due to some with a similar shape as a Roman oil lamp. Read the Brachiopod vs. , Jul 12, 2017 · For future reference, here is a method for differentiating between brachiopods and bivalves which I find to be useful. Phylum Brachiopoda Brachiopods are sedentary marine invertebrates that possess a hard, mineralized shell consisting of two hinged halves (valves) that enclose the delicate soft body of the animal. Overview Brachiopods are solitary creatures that inhabit the seafloor Feb 10, 2015 · Like clams, brachiopod shells have two halves around their bodies, but in brachiopods those two halves are different, while the two halves of a clam's shell are identical. Many brachiopod varieties have been described. Many look nearly identical. The easiest differences to identify are in the shells of clams, part of the mollusk family, and Brachiopods. , The phylum Arthropoda is unique in that it contains more than any other phylum. Is a clam a brachiopod? Brachiopods are a type of marine invertebrate (lacking a backbone) animal. 6 Brachiopoda. Brachiopods and Lamp shells - Anatomy, Habitat, Feeding: Two major groups of brachiopods are recognized based on the articulation of the valves (shells) by teeth and sockets. 1 Brachiopod Classification –– 1. Tunicates are part of the phylum Chordata and brachiopods belong to their own phylum called Brachiopoda. Bivalves include clams, scallops, mussels, oysters, and their relatives. g; clams and mussels) but are better known in several other ways Brachiopods are one of the few groups of marine animals which live ONLY in the Ocean! Most bivalve mollusk shells, like clams, are mirror images of each other. They are marine bivalves that first appeared in the early Cambrian seas and still live today. They are so common in the fossil record that in some areas they make up most of the rock in which they are found. Brachiopods in some ways resemble clams but differ from clams in shell symmetry. Jan 5, 2023 · Bivalves (also called pelecypods) are clam and clam-like, shelled invertebrate (lacking a backbone) animals. -clams -brachiopods -tunicates -snails, Most mollusks range in size from a few ---- or centimeters to more than 15 ---- in length. Although Brachiopod larvae swim about freely, the adults are frequently anchored or cemented to objects on the sea floor by a fleshy stalke (pedicle) or by spines. It has to do with the symmetries of the valves: So if you take a brachiopod like the one on the left of the image, the left and right sides of the shell will be symmetrical if you are viewing the dorsal valve but the ventral Jul 7, 2022 · Ash from southwestern China’s Emeishan Traps, for example, dates to the Capitanian and has previously been implicated as a potential cause of the local brachiopod extinction. Furthermore, the nature of the valves is quite different from that of clams. Do not confuse brachiopods for clams. Nov 10, 2023 · THEY ARE NOT CLAMS. Brachiopod shells come in a variety of shapes and sizes (fig. 1. Bivalves vs. Clams, Mussels, Oysters, Scallops, Shipworms. Also known as lampshells, brachiopods belong to the phylum Brachiopoda, which has existed for around 550 million years. They differ from clams in that they have symmetrical shells of unequal size. Brachiopods are members of the phylum Brachiopoda, or lamp shells. Jul 31, 2014 · Consequently, brachiopods (brachio=arm; pod = foot) are bilaterally symmetrical and consist of bivalved shells. This structure, called the lophophore, is actually used for feeding and respiration and is common to all brachiopods. Abrachiopod is a type of bottom-dwelling marine invertebrate with a shell similar to that of a clam or mussel. This changed after the mass extinction at the end Most clam valves are mirror images of each other, like a pair of hands. Clams and their relatives are much more efficient at extracting oxygen from seawater, so they were more successful after the extinction. Only a trace of an auricle , or ear-like lobe (see drawing) can be seen at the upper right margin of the specimen in the photograph. Brachiopods usually attach themselves to the seafloor by a fleshy stalk that extends through one of the valves. Generally, Oct 11, 2012 · Clams, Brachiopods, Turritella, Ammonites and other interesting shells are found, often with cores and voids filled with crystals of calcite. However, brachiopods are not closely related to mollusks. They are actually quite different from clams in their anatomy, and they are not closely related to mollusks at all. Notice the difference in how the aragonite and calcite looks. Aviculopecten, the marine clam shown above, is one of the clams that is very nearly equilateral and is thus difficult to distinguish from the brachiopods. Multiple choice question. Hundreds of different types of brachiopods can be found in Kentucky. They are clam-like creatures that have two valves or shells of different sizes. Chapter contents: 1. clams and d. Clams, oysters and other bivalves, although somewhat similar to brachiopods, in fact belong in a different phylum, the Mollusca. They were once referred to as lampshells because they look like old Roman oil lamps. A mirror image or plane of symmetry of a brachiopod cuts the valve in half along its length (Figure 9). Brachiopods are a 550 million year old phylum of filter-feeding animals that once ruled over the paleozoic seafloor. [55] Culture of clams, cockles and ark shells Nov 21, 2023 · Oysters, clams, mussels, scallops, cockles, coquinas, and many more are all part of the class Bivalvia. , The molluscs are notable for which reason? and more. , clams), the similarities are superficial, and they are not closely related Diversity. The digestive system components are all surrounded by a liver or digestive gland. Bivalve sampling rates are positively correlated with brachiopod and bivalve extinction rates, but not their origination rates (Table 2B). It is a product of 1 event: the Permian extinction (which affected brachiopods profoundly and clams relatively litte). However, their diversity peaked during the Devonian Period. Aug 20, 2015 · Brachiopod sampling rates are positively linked to both bivalve origination and extinction but the type of link model is uncertain in both cases. When Paleozoic and post-Paleozoic times are plotted separately, numbers of clam and brachiopod genera are positively correlated in each phase. Although they outwardly resemble clams (which are bivalve mollusks), they are not closely related and their internal anatomy is completely different. Superficially they look like clams, but they can easily be distinguished from clams by noting that the brachiopod is attached to the substratum by a peduncle that passes through one of the valves. A single zooid is hardly bigger than a comma on a printed page. Each valve, however, is bilaterally symmetrical. 6). For example, the Pacific razor clam buries itself within seven seconds, while the Atlantic jackknife clam takes fifteen seconds to do the same. Brachiopods are a very old, old group of invertebrates with a relatively rich fossil record. Brachiopods are composed 6 days ago · Brachiopods look like clams but are very different inside. Brachiopods are bilaterally symmetrical perpendicular to the hinge line (where the two valves touch), whereas clams are bilaterally symmetrical parallel to the hinge line (each valve is a mirror image of the other). Brachiopods look similar to mussels and clams, but are an entirely separate group of animals. Unlike bivalves, brachiopods are symmetrical along the midline of the shell, which inspired the Chinese name "stone butterflies. There may be as many as 50,000 described living species of bivalves (estimates of the diversity of living species range from 7500 to about 50,000; see Huber, 2010; Ponder et al. Brachiopod and bivalve diversity curves through time. This fundamental difference in shell symmetry is a key distinguishing feature between bivalves and brachiopods. In other words when you see a living brachiopod lying on the beach, it really is lying on its “belly” or “back”. This is not true for the clams. During the Paleozoic era (542-250 million years ago), brachiopods were one of the most abundant and diverse groups of marine organisms. Bivalves (clams) Bivalves, like brachiopods, are shelled creatures. However, brachiopods and bivalves are only superficially similar. Mar 26, 2014 · Why did the ancestors of clams and oysters flourish after one of the worst mass extinctions in Earth's history while another class of shelled creatures, the brachiopods, sharply decline? By using . The phylum Brachiopoda, also known as lamp shells, is a group of bilaterally symmetrical, coelomate organisms that superficially resemble bivalve molluscs. Fill in the blank question. The rock was quarried and made into cement by the Milwaukee Cement Company between 1876-1907. The supposed replacement of brachiopods by clams is not gradual and sequential. Clams Snails. scales is equivocal. Brachiopods are among the most common fossils in Indiana rocks. Mollusk shells are about equal size, but in brachiopods, the bottom shell is larger than the top. Living Brachiopods also fall into this range. The trivial names are deceiving – their similarity with a Roman oil lamp accounts for the wrong assignment of terebratulid brachiopods to clams and mussels. Brachiopods are marine invertebrate animals with two shells. Found only in strata deposited 600–250 million years ago in the shallow seas that covered Indiana, they rather resemble clams but are a distinct phylum of marine animals. However, from the Cambrian to the Permian (542 to 252 million years ago), another group of organisms called brachiopods dominated the world's oceans. Clams, or bivalves, belong to the Class Bivalvia in the Phylum Mollusca, while brachiopods belong to their own phylum, Brachiopoda. snails. They resemble clams, but are a distinct type of marine animal. , Which environments are inhabited by mollusks? Multiple choice question. Most soft-bodied, aquatic animals with two shells fall into this group. The outer surface of the valves may be marked by concentric wrinkles or radial ribs. Brachiopods are distinguished from pelecypods (clams) by their inequal valves and by their bilateral symmetry. Only about 300 to 500 species of brachiopods exist today, a small fraction of the perhaps 15,000 species (living and extinct) that make up the phylum Brachiopoda. The Source for information on Brachiopods: The Gale Encyclopedia of Science dictionary. Bones: These bones are preserved in tar. Marine bivalves and brachiopods have overlapping niches such that competi-tion for food and space may occur. Although to the untrained eye brachiopods might resemble bivalves (e. Brachiopods are found either attached Brachiopod shells are common and easily recognized fossils within many marine rock units throughout Ohio. Many traditional classifications have considered brachiopods (and other lophophorates) to be basal deuterostomes, based on several classically deuderostomic characters: initial cell division of the egg (cleavage) is radial (the cells are arranged in rows, as opposed to spiral cleavage); enterocoelic development leads to a Study with Quizlet and memorize flashcards containing terms like Clams, oysters, mussels and shipworms are molluscs that belong to the group referred to as, Bivalves have ______ part(s) to their shell. This is true of most clams. The internal organs are in the coelom, the lophophore in the mantle cavity. The phylogenetic position of the brachiopods has been controversial. Only special muscles, called adductor muscles, can close the shells together. Most are now extinct. Study with Quizlet and memorize flashcards containing terms like What kingdom and phylum are Brachiopods?, True or false: Bachiopods are marine, solitary feeders, True or false: Brachiopods have two shell halves (valves) and are closely related to clams (bivalves) and more. 2. Getting to a collecting location is simple! Simply pull up Google Maps and take a look at a satellite view of Central Texas. Dec 17, 2019 · Brachiopods. Figure 11. Small teeth and sockets may also be present in the hinge area, which add strength to the hinge and prevent the two valves from slipping apart. Bivalves –– 1. It was a filter feeder that lived on or buried in the seafloor. May 31, 2024 · While sensing a predator in the surroundings, some bivalves can quickly bury themselves in the sand. 4 Brachiopod PreservationAbove Image: Animal forms; a second book of zoology (1902), Figure 43: Animals of Uncertain Relationships. Each brachiopod valve is bilaterally symmetrical from the center of the hinge to the point of the shell opening opposite to the hinge. The lamp shell, Lingula unguis of Brachiopoda, with its morphological resemblance to bivalves, has sometimes been included among the Molluscoidea; this resemblance, plus the similarity of its GSL oligosaccharide core structure to that of Mollusca, are interesting factors in Internal view of the right valve of a clam. The name ‘Brachiopoda’ comes from the Greek words ‘brachion’ (=arm) and ‘podos’ (=foot). Brachiopod structure seems to have evolved in a series of steps: first a stationary filter feeder with a tubular shell (such as Eccentrotheca, a basal tommotiid brachiopod), second a bivalved shell which did not completely enclose the body (most tommotiids), and finally a bivalved shell which completely enclosed the body. Bryozoans live together in colonies and form branching stemlike, lacy, or encrusting forms. Brachiopod shells come in a variety of shapes and sizes. 9 inches (200 mm), but most are 2-4 inches (3-8 cm). Bivalves are a class of mollusk with two valves, which is where they get their name (“bi” means two in Latin). Modern limpets - aragonite with nacre (mother of pearl) 2C. In the Paleozoic Era, however, brachiopods were abundant and far outnumbered the shells of clams and snails living in the sea. Moreover, there is a long-standing debate over whether bivalves outcompeted brachiopods evolutionarily, because brachiopod diversity declined through time while bivalve diversity increased. The largest fossil Brachiopod found is 7. Their shells have two valves attached along a hinge, similar to clams. Brachiopod shells are both unlike and unequal. Brachiopod. Compare the aragonite shells with the calcite brachiopods. Jul 8, 2023 · Are brachiopods related to clams or oysters? Brachiopods and bivalve mollusks (such as clams and oysters) have similarities in their bivalve shells, but they are not closely related. Brachiopods are one of the most abundant fossils in the Paleozoic, and this shows at Caesar Creek, where they are so numerous, one must walk on them. Brachiopods (or Brachiopoda) are often confused with bivalved mollusks (clams or Bivalvia). Instead of being horizontally symmetrical along their hinge, like clams and other bivalves, they are vertically symmetrical, cut down the middle of their shell. There are many different types of Brachiopods at Caesar Creek. 4. The valves, of unequal size, are bilaterally symmetrical; i. There are two classes of these clam like creatures. They have a distinct anatomy, with a stalk or a hinge that attaches them to the substrate. Most brachiopod valves are not mirror images. But brachiopods are no mollusks at all, but bivalved sea creatures with tentacles that belong to a separate phylum. 2A. Like bryozoans, they were abundant during the Ordovician Period, but are now rare. Oct 25, 2019 · Although they have hard shells with two halves (valves), they are not related to clams (bivalves). Jul 28, 2016 · Brachiopods belong to their own phylum, whereas clams are a class within the phylum Mollusca (which also includes octopods, snails, and several other smaller groups). g. and more. It's the brachiopods! These creatures are still around today. Bivalves, such as clams and oysters, have shells that are mirror images of each other and are symmetrical along their midline. Study with Quizlet and memorize flashcards containing terms like Almost all bilaterian animals belong to either of these clades:, The phylum Arthropoda is unique in that it contains more ______ than any other phylum. Some had a fleshy stalk, some Brachiopods and bivalves made their appearance at this time, and left their fossilized remains behind in the rocks. The two shells are hinged together by a strong ligament. Modern A brachiopod is a marine invertebrate characterized by its bivalve shell, which resembles those of clams or oysters. So, the correct answer is option a. Brachiopods belong to phylum brachiopoda, while bivalves are mollusks. They are covered by two valves, or shells; one valve covers the dorsal, or top, side; the other covers the ventral, or bottom, side. Brachiopoda (from Latin bracchium, arm + New Latin -poda, foot) is a major invertebrate phylum, whose members, the brachiopods or lamp shells, are sessile, two-shelled, marine animals with an external morphology resembling bivalves (that is, "clams") of phylum Mollusca to which they are not closely related. Their ventral and dorsal valves are opened … Mollusc shells, like clams, are divided between left and right, while Brachiopod shells are divided between top (dorsal) and bottom (ventral). It is a product of one event: the Permian extinction (which affected brachiopods profoundly and clams relatively little). At first glance, you might assume that brachiopods [BRAK-ee-oh-pods] are just clams, since they have two “shells” (valves) and a hinge that allows the shells to close and protect their soft insides. Shanks The brachiopods are a small phylum of sessile filter feeders with bivalved shells. Scallops and file clams can swim away from danger by rapidly opening and closing the two valves. Upon a closer look, however, brachiopods do not have the same shape, symmetry, or inner makeup as clams. Brachiopods now live in deeper waters where food is scarcer. While the two brachiopod valves differ in shape, each individual valve is bilaterally symmetrical. Some Brachiopods are still alive today, but Pelecypods (clams and such) far outnumber them. They are filter feeders; however, their tentacles remain inside their shell. Like bivalves (such as clams), brachiopods have a hard shell consisting of two valves (shell halves). It comprises fairy shrimp, clam shrimp, Diplostraca (or Cladocera), Notostraca, the Devonian Lepidocaris and possibly the Cambrian Rehbachiella. In bivalves the mirror image runs along the edge of the Feb 8, 2016 · The supposed replacement of brachiopods by clams is not gradual and sequential. Brachiopods (/ ˈbrækioʊˌpɒd /), phylum Brachiopoda, are a phylum of animals that have hard "valves" (shells) on the upper and lower surfaces, unlike the left and right arrangement in bivalve molluscs. Brachiopoda Alan L. The shells are hinged together by a ligament that continually forces the shells open. Brachiopods look like clams, mussels, and other bivalves, but they are actually quite different and not closely related. Jul 27, 2016 · The top and bottom of a clam will be virtually identical, while in the case of brachiopods its the right and left. It is a product of one event: the Permian extinction (which affected brachiopods profoundly and clams relatively little)". Sometimes the bottom valve is convex like the top valve, but in many species the bottom valve is concave or occasionally conical. They have two shells (and are superficially similar to bivalves, e. Approximately 450 species of living brachiopods are currently known, and have traditionally been divided into two classes: Inarticulata (orders Lingulida and Acrotretida) and Articulata (orders Rhynchonellida, Terebratulida and Jan 5, 2023 · Kentucky’s State Fossil is a brachiopod. Brachiopod shells are symmetrical at a glance, but the bottom shell is smaller. Hebertella is a common fossil brachiopod found in Upper Ordovician rocks. One survives by searching out environments suited to an unchanging form, the other by adapting its form or behavior to the local environment Brachiopods (above) are another common marine invertebrates that can be found in the Mississippian limestones of Rock Canyon. Source: Wikimedia Commons (Public Domain). , 2020) and over 42,000 described fossil species (Pojeta, 1987). , A(n) _______ is an individual that is capable of producing both sperm and eggs. Most clam valves are mirror images of each other, like a pair of hands. 5). In contrast, brachiopods have a shell that consists of two halves, but these halves are not symmetrical. Pleistocene clams - aragonite 3. Brachiopods Clams Snails Tunicates. However, there is a trick to differentiating between the two. . Brachiopods are quite different. Another distinctive feature is their bilaterally symmetrical valves, in which the right half mirrors the left, different from the symmetry of clams (fig. Brachiopods are fossil shells, from animals that lived in ancient seas. 2 Brachiopods vs. Brachiopoda –– 1. Specifically, brachiopods suspension feed, live inside calcium carbonate shells with two valves that hinge together in some species, and attach to rocks or other hard Much of the rock is fossiliferous with spiriferid brachiopods, bryozoans, crinoids, cephalopods, bivalves, gastropods, trilobites, sharks, fish, and plant fossils. The pelecypods are a type of mollusk that has two shells, hence the common name of bivalves. Study with Quizlet and memorise flashcards containing terms like Examples of the Mollusca phylum include Multiple select question. , Individuals that can form both sperm and eggs are known as: and more. However, tunicates and brachiopods are not members of the Mollusca phylum. Unlike the valves of brachiopods, clam valves are typically of similar size and shape. However, there are major biological differences between brachiopods and bivalves. Even though they are not closely related to mollusks, brachiopods looks and act like bivalve mollusks (clams or mussels). Study with Quizlet and memorize flashcards containing terms like Squid, octopuses, chitons, snails, clams, and oysters are all members of the phylum, Which environments are inhabited by mollusks?, The basic body plan of a mollusk consists of three parts: a muscular _____(used for movement), a _____mass (which contains the internal organs), and a _____(which produces the shell in mollusks that Kentucky State Fossil: Brachiopod (Lamp Shells) Brachiopods are fossil shells, from animals that lived in ancient seas. Modern brachiopods live in the sea. dwio zidoo cair omq mclpi til xxxok kdpvf mvgeuw bmbz imc oyygjhkb moeith sqycfo ofh