GAMMARUS

CLASSIFICATION OF GAMMARUS

PHYLUM :- ARTHROPODA (Jointed appendages.)

CLASS :- CRUSTACEA (Thick exoskeleton, antennae 2 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 :- . Gammarus (The sand flea) )

GEOGRAPHICAL DISTRIBUTION

  • Gammarus is found in salt, brackish and fresh-waters. It is mainly a scavenger, eating dead and decaying animals and vegetation.

HABIT AND HABITAT

  • Gammarus is found in salt, brackish and fresh-waters. It is mainly a scavenger, eating dead and decaying animals and vegetation.

GAMMARUS

GENERAL CHARACTERSTICS OF GAMMARUS

  • Commonly called as sand-flea or fresh-water shrimp.
  • Body is bilaterally compressed and differentiated into head, thorax and abdomen. 
  • First thoracic segment is fused with head and without carapace 
  • Study of Museum Specimens Head appendages are antennules, antennae, mandibles, maxillulae, maxillae.
  • First fused thoracic segment contains maxillipedes without epipodites and 7 free thoracic segments contain walking legs. First 2 pairs of legs are subchelate, the remaining are non-chelate, of which the first 2 pairs are directed forwards and the last three backwards. Second third pairs usually prehensile.
  • Coxopodites of walking legs contain branchiae.
  • Third and fourth abdominal segments are flexed ventrally. First three and the last three segments bear swimming pleopods and jumping uropods, respectively. The first three pairs of pleopods bear multiarticulate rami.
  • Last three abdominal segments have bunches of small hairs. Posteriorly abdomen ends in a telson having deep cleft. 
  • Heart is thoracic. 
  • Sexes are separate. Fertilization is external. Eggs and embryos are carried by female which in tum are carried by males.
GAMMARUS

IDENTIFICATION

  • The animal has no carapace and contains all above features, hence it is Gammarus

GAMMARUS
GAMMARUS
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