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In many brachiopods, a stalk-like pedicle projects from an opening near the hinge of one of the valves, known as the pedicle or ventral valve. The pedicle, when present, keeps the animal anchored to the seabed but clear of sediment which would obstruct the opening. Brachiopod lifespans range from three to over thirty years.
The stalk (or pedicle) is a long white extension of the body, that emerges at the apex from between the valves, and not, as in articulate brachiopods, from a special opening in the dorsal valve. At the rear end, that is deepest in the sea bed, the skin (or epithelium ) secretes a glue-like mucus that binds to the substrate's particles, thus ...
The pedicle valve is the one that the pedicle, or hold-fast stalk, attaches to. [1] The brachidia, which hold the lophophore, the ciliated feeding arms, are looped, as in the Orthida . The Short hinge line helps distinguish the pentamerids from the ancestral orthids from which they are obviously derived. [ 1 ]
Lingulata shells are composed of a combination of calcium phosphate, protein and chitin. This is unlike most other shelled marine animals, whose shells are made of calcium carbonate. The Lingulata are inarticulate brachiopods, so named for the simplicity of their hinge mechanism. This mechanism lacks teeth and is held together only by a complex ...
Terebratalia is a genus of brachiopods belonging to the family Terebrataliidae. [1] Terebratalia** is a genus of brachiopods, marine animals with hard "shells" on their upper and lower surfaces, similar to bivalve mollusks. These organisms are part of the phylum Brachiopoda, which are often referred to as "lamp shells" due to their resemblance ...
Atrypa is a genus of brachiopod with round to short egg-shaped shells covered with many fine radial ridges (or costae). Growth lines form perpendicular to the costae and are spaced approximately 2 to 3 times further apart than the costae.. The pedunculate valve is slightly convex, but oftentimes levels out or becomes slightly concave toward the ...
Terebratalia transversa. (Sowerby, 1846) Terebratalia transversa or the North Pacific Lampshell is a species of marine brachiopod in the family Terebrataliidae. [1][2] A two-valved shelled species, they are most frequently found in tidal habitats in the Pacific Northwest of the United States. [3][4][5] Terebratalia transversa radial symmetry ...
Siphonotretida. Siphonotretida is an extinct order of linguliform brachiopods in the class Lingulata. The order is equivalent to the sole superfamily Siphonotretoidea, itself containing the sole family Siphonotretidae. Siphonotretoids were originally named as a superfamily of Acrotretida, before being raised to their own order.