identification of lobsters

7/30/2019 Identification of Lobsters

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By Shravan Kumar Sharma

LOBSTERS IDENTIFICATION


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General morphology of Lobsters Body consists of two main partsa) Cephalothorax with its appendages.

b) Abdomen with its appendages.

Cephalothorax consists of 14 segments (6

cephalon and 8 thorax)a) Somite 1 ophthalmic somite, carries the eyes,

usually movable and consists of a stalk.

b) Somite 2 antennular spine carries antennules

c) Somite 3

antennal somite, carries the antennaed) Somite 4 to 9 carry mouth parts.

e) Somite 10 to 14 carry 5 pairs of Periopods.


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Abdomen consists of 6 segments (15 to 20)

Dorsal part

tergite Ventral part sternite

Lateral part pleura

From 15 to 19 5 pairs of pleopods are there.

Somite 20 bears the tailfan, which consists of a

pair of uropods and unpaired telson.


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Panulirus homarusAbdomen segments with anterior margins of

transfer grooves.

Antennal plates with 2 pairs of large spines and a

few spinules.

Legs with inconspicuous, irregular spots and

short stripes.

Body with greenish to blackish with numerous

very small, white spots without transfer bands. White and greenish bands present in antennules.


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Panulirus ornatus (Ornate spiny lobster)

Abdomen segments smooth, without a transfergroove with a broad transfer band of a brown

color over the middle and only 2 white blotches

on either side.

Antennular plate with 2 pairs of large spines.

Legs conspicuously and irregularly spotted.

Bluish or greenish spines on carapace yellow.

Anterior part of carapace on and near bases ofthe frontal horns and the anterior spines with a

vermicular patter of pale and dark lines.


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Panulirus polyphagus (Herbst,

1793)

Abdomen smooth, without a transverse groove, a

transverse white band present along posterior

margin of segments.

Antennular plate with 2 large spines, without

spinules.

Legs irregular and inconspicuously blotched.

Antennules broad banded.


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Panulirus versicolor

Abdominal segments without a transfer groove

with a white band along posterior margin,

flannked at either side by a dark band.

Antennular plate with 4 large spines.

Legs and antennules longitudinally striped.

Carapace with a characteristics pattern of dark

blue areas with white lines.

Bases of antennal bright pink not extending on toantennular plate.


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Panulirus penicillatus

Abdomen segments with distinct transverse

grooves and numerous, very small white spots,

but without a pale band along posterior margin.

Two pairs of almost equal spines joined at their

bases on the antennular plate.

Males usually darker than females.


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Genus puerulus First pair of legs not enlarged with no trace of a

pincer without cross bands.

Carapace without a scale-like sculpture.

Tail variously coloured, smooth or with at most 2

transverse grooves.

Two distinct. Widely separated tooth-like frontal

horns, between which the anterior margin of the

carapace is visible.Antennal flagella, although large and firm, quite

flexite.

Flagella of antennules short, shorter than last

segment of antennular peduncle.


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Puerulus sewelli

Carapace angular, with a median and 2 lateral

tuberculate longitudinal ridges behind the transfer

cervical groove and 3 pairs of ridges in front

median postcervical ridge wth 8 small teeth

frontal horns.


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The most common genus coming under the family

Scyllaridae is Thenus


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Thennus orientalis

Widest in front and distinctly narrowing porteriorly

Lateral margin straight with only two teeth.

Fifth segment with a sharp spiniform tooth in themiddle of posterior margin.


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identification of lobsters

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