CLASSIFICATION OF STRONGYLOCENTROTUS
KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)
PHYLUM :- ECHINODERMATA (Coelomate, pentaradiate and spiny skinned animals with vascular system.)
SUB-PHYLUM :- ELEUTHEROZOA (Non-pedicellate and free-living.)
CLASS :-ECHINOIDEA (Body oval or spherical and composed of test)
SUB-CLASS :- REGULARIA OR ENDOCYCLIA (Periproct and peristome, aboral and oral respectively.)
ORDER :- ECHINOIDA (Simultaneously possessing both an un-sculpted test and a feeding lantern with large plates fused across the top of each pyramid)
GENUS :- Strongylocentrotus
It is found in Europe, Asia, Pacific coast, Mexico to Alaska and U.S.A.
HABIT AND HABITAT
Strongylocentrotus is a marine and regular echinoid, adapted for swimming life.
GENERAL CHARACTERSTICS OF STRONGYLOCENTROTUS
- Strongylocentrotus is a genus of sea urchins in the family Strongylocentrotidae containing several species.
- Body is rounded and contains large tubercles for thick spines. Test is differentiated into oral and aboral surfaces.
- Oral surface has a central mouth through which teeth of jaw apparatus (Aristotle’s lantern) project.
- Mouth is surrounded by peristomial membrane.
- Aboral surface is composed of calcareous plates. It is differentiated into ambulacral and inter-ambulacral zones.
- Ambulacral grooves are absent. Several tube feet are seen in ambulacral zone. Test contains openings for tube feet in ambulacral zone.
- Anus is aboral.
- Gemmiform pedicellariae are rounded and without teeth.
- Gills and sphaeridia are present. Development includes echinopluteus larva
The animal contains brightly coloured spines and all above features, hence it is Strongylocentrotus.