LEPAS

CLASSIFICATION OF LEPAS

PHYLUM :- ARTHROPODA (Jointed appendages.)

CLASS :- CRUSTACEA (Thick exoskeleton, antennae 2 pairs)

SUB-CLASS :- CIRRIPEDIA (Sessile adults without compound eyes and antennae, with carapace and
mandibular palps and with 6 pairs of biramous thoracic limbs)

ORDER :- THORACICA (Non-parasitic, carapace of calcareous plates and 6 pairs of thoracic
appendages.)

GENUS :- Lepas (The goose barnacle or ship barnacle)

GEOGRAPHICAL DISTRIBUTION

  • Cosmopolitan. Specially found on Pacific coast, North of San Francisco, Bay of Fundy.

HABIT AND HABITAT

  • Lepas is the most familiar cirripede found attached to floating seaweeds, logs, turtles and ships between tide-marks. It is a planktonic filter feeder.

LEPAS

GENERAL CHARACTERSTICS OF LEPAS

  • Commonly called as goose barnacle or ship barnacle because barnacle geese were once thought to hatch from them.
  • Animal is composed of bilaterally compressed vermiform and unsegmented body, the capitulum, and a peduncle.
  • Peduncle or stalk is much narrower than the rest of the body and without scales. The peduncle is long and stout and acts a hold-fast organ. 
  • Body is flattened and covered by calcareous plates consisting of a pair of scuta at the stalk end, a pair of small terga at the opposite end, and a median dorsal carina lying along the hinge.
  • Capitulum encloses the viscera and itself is encased in a bivalved carapace in which above plates are embedded. 
  • Six pairs of cirriform many-jointed, biramous thoracic appendages fringed with tuft of setae arise from the thorax
  • Mouth is ventral and anterior end is provided with mandibles and two pairs of maxillae. Antennae and paired eyes are absent. 
  • The outer plates of mantle are not fused to form a peripheral wall. 
  • Lepas is hermaphrodite but is having cross fertilization.
LEPAS

IDENTIFICATION

  • The Animal contains stalk, body, 6 pairs of thoracic appendages and all above features, hence it is Lepas

LEPAS
LEPAS
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