Arachnoides
Encyclopedia
Arachnoides is a genus of sea urchin
within the family
Arachnoididae
, found in the Indo-Pacific
oceans. The base is flat and the upper surface is convex .
Sea urchin
Sea urchins or urchins are small, spiny, globular animals which, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. They inhabit all oceans. Their shell, or "test", is round and spiny, typically from across. Common colors include black and dull...
within the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...
Arachnoididae
Arachnoididae
Arachnoididae is a family of echinoderms of the order Clypeasteroida.-Genera:* Ammotrophus H. L. Clark, 1928* Arachnoides Leske, 1778* Fellaster Durham, 1955* Fossulaster Lambert & Thiery, 1925* Monostychia Laube, 1869...
, found in the Indo-Pacific
Indo-Pacific
The Indo-Pacific is a biogeographic region of the Earth's seas, comprising the tropical waters of the Indian Ocean, the western and central Pacific Ocean, and the seas connecting the two in the general area of Indonesia...
oceans. The base is flat and the upper surface is convex .
Species
- Arachnoides placenta (Linnaeus, 1758) Australia to Philippines
- Arachnoides tenuis H. L. Clark, 1938 Western Australia
- Arachnoides zelandiaeArachnoides zelandiaeArachnoides zelandiae, or the snapper biscuit, is an echinoderm of the family Arachnoididae, endemic to New Zealand. Maximum width is 100 mm.-References:...
Gray, 1855 New Zealand