Echinodermal

E*chi`no*der"mal

(?), a. (Zol.) Relating or belonging to the echinoderms.
[1913 Webster]

E*chi`no*der"ma*ta

(*k`n*dr"m*t), n. pl. [NL., fr. Gr. 'echi^nos hedgehog, sea urchin + de`rma, -atos, skin.] (Zol.) One of the grand divisions of the animal kingdom. By many writers it was formerly included in the Radiata.
[Written also Echinoderma.]

[1913 Webster]

The species usually have an exterior calcareous skeleton, or shell, made of many pieces, and often covered with spines, to which the name. They may be star-shaped, cylindrical, disk-shaped, or more or less spherical. The body consists of several similar parts (spheromeres) repeated symmetrically around a central axis, at one end of which the mouth is situated. They generally have suckers for locomotion. The group includes the following classes: Crinoidea, Asterioidea, Ophiuroidea, Echinoidea, and Holothurioidea. See these words in the Vocabulary, and also Ambulacrum.
[1913 Webster]

 

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Sun 16th December 2018