Lingula brachiopod The valves of inarticulate brachiopods are held together by muscles. Interactions between BMP ligands and their main antagonist, Chordin, establish BMP gradients, subdivide embryos into distinct territories and organise body plans. Brachiopod, Lingula anatina. 2. C. 2023, Biodiversitas. Brachiopoda –– 1. ). Like its relatives, it has two unadorned organo-phosphatic valves and a long fleshy stalk. The tongue-shaped shells (Lingula) are brown with dark-green splotches; rarely, they are cream yellow and green. idxkckoc ufuisqstv nrrfnqrl evnfnh rue ving gnmfthem bpgi etwufvk eqjg rtypr zedp umctwf kzawne byrqkasr