Search results
Results From The WOW.Com Content Network
The name echinoderm is from Ancient Greek ἐχῖνος (ekhînos) 'hedgehog' and δέρμα (dérma) 'skin'. [4] The name Echinodermata was originated by Jacob Theodor Klein in 1734, but only in reference to echinoids. It was expanded to the phylum level by Jean Guillaume Bruguière, first informally in 1789 and then in formal Latin in 1791.
The name comes from the Greek "echinos" (ἐχῖνος) meaning a hedgehog or sea-urchin [5] and "derma" (δέρμα) meaning skin, [6] referring to the spiny cap surface. The noun "derma" is neuter and therefore if the species name is an adjective, it needs to take the neuter ending (example: Echinoderma asperum ).
It is derived from the Greek aster, ἀστήρ (a star) and the Greek eidos, εἶδος (form, likeness, appearance). [94] The class Asteroidea belongs to the phylum Echinodermata. As well as the starfish, the echinoderms include sea urchins, sand dollars, brittle and basket stars, sea cucumbers and crinoids.
Yanjiahella biscarpa is an extinct species of Early Cambrian deuterostome which may represent the earliest stem group echinoderm. [1] [2]This species is known from the Fortunian Yanjiahe Formation (~541.0–534.6 Ma) in Hubei province, China and was first described by Guo et al. [3] who had difficulty in assigning a taxonomy to the animal due to the shared nature of its features between the ...
Eleutherozoa is a subphylum of echinoderms. They are mobile animals with the mouth directed towards the substrate. They usually have a madreporite, tube feet, and moveable spines of some sort. It includes all living echinoderms except for crinoids. The monophyly of Eleutherozoa has been proven sufficiently well to be considered "uncontroversial ...
The entire work is framed in terms of explaining art, its symbols and meaning, to a young audience. The author of the work in the introduction states that the ten-year-old son of his host was the immediate cause of the composition of this work and that the author will structure the book and each of its chapters as if this boy is being addressed.
The brownish scales on the cap and the lower part of the stem and the white gills make the genus Echinoderma quite distinctive, but E. asperum could be confused with other members, such as E. calcicola (which has warts the same colour as the background and non-forking gills which are less crowded) and the rare E. hystrix (which is darker and has dark gill-edges).
The Eocrinoidea were an extinct class of echinoderms that lived between the Early Cambrian and Late Silurian periods. They are the earliest known group of stalked, brachiole-bearing echinoderms, and were the most common echinoderms during the Cambrian. The earliest genera had a short holdfast and irregularly structured plates. Later forms had a ...