The mantle lobes are small and not reflected on to the shell.
2.
Nutrients are transported throughout the coelom, including the mantle lobes, by cilia.
3.
The physical distinctive criteria are two mantle lobes on the first half of the body on each side.
4.
Prionodesmacea have a prismatic and nacreous shell structure, separated mantle lobes, poorly developed siphons, and hinge teeth that are lacking or unspecialized.
5.
Teleodesmacea on the other hand have a porcelanous and partly nacreous shell structure; Mantle lobes that are generally connected, well developed siphons, and specialized hinge teeth.
6.
The shell is added to in two ways; the valves grow larger when more material is secreted by the mantle at the margin of the shell, and the valves themselves thicken gradually throughout the animal's life as more calcareous matter is secreted by the mantle lobes.
7.
The larvae of inarticulates swim as plankton for months and are like miniature adults, with valves, mantle lobes, a pedicle that coils in the mantle cavity, and a small lophophore, which is used for both feeding and swimming except that genera have survived for a year in aquaria without food.
8.
It is very thin, fragile and transparent . Shell colour is greenish or yellowish . The shell aperture has a mouth membrane which runs from the umbilicus along the inside of the outer lip . The animal is pale to dark grey or black, paler forms have large dark grey areas . The mantle lobe is very large . Genitalia : Penis with appendix, joins vagina below the insertion of spermatheca duct.
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