CLASSIFICATION OF CAPRELLA
PHYLUM :- ARTHROPODA (Jointed appendages.)
CLASS :- CRUSTACEA (Exoskeleton thick, antennae 2 pairs, jaws 3 pairs.)
SUB-CLASS :- MALACOSTRACA (Free-living Crustacea with compound eyes, biramous antennules. mandibles. 8 thoracic and 6 abdominal segments having appendages. )
ORDER :- AMPHIPODA (Carapace absent. body elongated and laterally compressed.)
GENUS :- . Caprella
It has cosmopolitan distribution. Specially found in U.S.A., Alaska to Santa Barbara.
HABIT AND HABITAT
Caprella lives in association of seaweeds, hydroid and polyzoan colonies.
GENERAL CHARACTERSTICS OF CAPRELLA
- It is a known as no-body crab with peculiar and extremely slender body and limbs.
- Body has elongated segments, consisting of cephalothorax and abdomen.
- First thoracic segments fuse with head forming cephalothorax containing eyes, antennules and antennae. Antennae are shorter than antennules.
- First antennae longer than the second.
- Thorax has six free segments and contains heart.
- Gills confined to third and fourth free thoracic segments on which the legs may be wanting while the rest have sub-chelate walking legs.
- Abdomen reduced to a small knob bearing a pair of rudimentary legs in the male.
- Male is smaller than the female. Structure of male is like female.
- It resembles in colour and form with polyzoan hydroid to which it mimics. It holds on by 3 pairs of long posterior prehensile thoracic legs.
The animal contains elongated cephalothorax and all above features, hence it is Caprella.