Labidocera pectinata   Thompson I.C. & Scott A.,  1903 (Copepod)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Calanoida
Family:Pontellidae

Description
Size: length 1.5-1.7 mm (male), 2 mm (female).

The proportional lengths of the cephalothorax and abdomen are as 3 to 1.
The cephalon and 1st thoracic segment are separate but thoracic segments 4 and 5 are fused together. The head is armed with sidehooks, the eye-lenses are large, as is usual in this sex, and the rostrum consists of a pair of spines; there is no rostral or ventral lens. The posterior thoracic margins are asymmetrical; on the left side the margin is armed with a single simple backwardly-directed spine, whereas on the right side it is produced in a prominent lobe-like process that terminates in three unequal spines.
The abdomen consists of five segments.

The furcal rami are symmetrical and bear the usual five setae, of which four are distally placed and the fifth arises from the external margin at the junction of the middle and distal thirds. The 2nd seta is about twice the length of the others. The 1st segment of the abdomen is armed on the right side, distally, with a straight spine.The 1st antenna on the left side is unmodified and consists of the usual twenty-three free joints. The right antenna is modified to form a grasping organ and the middle joints are somewhat swollen; the knee joint is, as usual, situated between the 18th and 19th segments.

The 17th segment bears on its upper surface a claw-like process bent sharply at a right angle near its base. The 18th segment is armed with a toothed plate, carrying a number of subequal needle-like teeth; this plate is prolonged proximally over the 17th segment and terminates distally in a sharp point. The 19-21st segment bears a delicately curved toothed plate, that bears needle-like teeth in its proximal three-fourths and terminates distally in a spinous process.

In the 1st swimming leg the 1st basal segment bears a single internal seta. The exopod consists of three segments that bear 1, 1 and 2 marginal spines and 1, 1 and 4 setae respectively; the end-spine is long, measuring one and a half times the length of the distal segment, and is finely serrated. The endopod consists of two segments, bearing respectively 3 and 6 setae; the endopod reaches as far as the level of the joint between segments 1-2 and 3.

The 2nd and 3rd swimming legs closely resemble each other. In both the exopod consists of three segments and the endopod of two only. The segments of the exopod bear 1, 1 and 3 marginal spines and 1, 1 and 5 setae respectively; while the segments of the endopod bear 3 and 8 setae respectively. The marginal spine on the 2nd segment of the exopod of leg 2 is large and reaches as far as, or even slightly beyond, the base of the proximal spine on exopod 3.

In the 5th pair of legs, the right leg is modified to form a claw. The 2nd joint bears a claw-like process proximally and is considerably swollen; on the upper margin there is a single straight spine near the base of the claw-like process and a single tooth, shaped like a champagne cork, about the middle of its length. The 3rd segment is curved and tapering and terminates in two unequal seta-like processes. The left leg ends in a segment that is almost like a hand; on the inner aspect is a curved process, on the proximal side of which lies a swollen prominence clad in hairs. Distally the segment bears a long slender spinous process and three others more seta-like. The penultimate segment is rectangular and forms a projection distally, owing to the terminal segment being articulated at the distal inner angle; a small spine is situated at the distal outer angle and a small seta arises from the inner margin about the middle of its length.


Synonym (s)
Labidocera pectinata Thompson and A. Scott, 1902
Labidocera similis Cleve, 1903
Labidocera pectinata Sewell, 1912
Labidocera pectinata Sewell, 1914

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Pelagic, Reef Associated, Estuarine, Coastal

Biogeography


• Kerala, Off Trivandrum Coast INDIA
• Maharashtra, Malad Creek (Lat: 20) (Long: 72) INDIA
• Maharashtra, Mumbai Harbour (Lat: 13.18) (Long: 80.38) INDIA
• Maharashtra, Bassein Creek INDIA
• Maharashtra, Thane Creek INDIA
• Karnataka, Netrani Island (Lat: 14.01) (Long: 74.32) INDIA (Record: 10/05/2006)
• Kerala, Vendurutti INDIA
• Kerala, Kochi Backwaters INDIA (Record: 01/1969-02/1969)
• Bay of Bengal INDIA (Record: 09/1997-08/1998)
• Tamil Nadu, Vellar Estuary (Lat: 11.48) (Long: 79.76) INDIA (Record: 09/1997-08/1998)
• Andhra Pradesh, Vishakhapatnam INDIA
• Maharashtra, Mumbai, Port (Lat: 18.9) (Long: 72.66) INDIA
• Maharashtra, Versova INDIA
• Maharashtra, Mahim INDIA
• Goa, Off Aguada INDIA (Depth: 5 mts)
• Gujarat, Saurashtra Coast (Lat: 20.84) (Long: 68.83) INDIA
• Gujarat, Saurashtra Coast (Lat: 22.50) (Long: 70.33) INDIA
• Orissa, Burhabalanga Estuary (Lat: 21.45) (Long: 87.06) INDIA (Record: 10/1991 - 08/1992)
• Southwest Coast INDIA (Record: 17/06/1987-10/07/1987)
• Arabian Sea (Lat: 16) (Long: 62) INDIA (Record: 12/09/1991-23/09/1991) (Depth: 200-500 mts)
• Arabian Sea (Lat: 23) (Long: 73) INDIA (Record: 12/09/1991-23/09/1991) (Depth: 200-500 mts)
• Maharashtra, Mumbai Harbour (Lat: 18.70) (Long: 72.85) INDIA (Record: 09/1984-11/1985) (Depth: 2.5-14 mts)
• Maharashtra, Dharamtar Creek (Lat: 18.86) (Long: 73.02) INDIA (Record: 09/1984-11/1985) (Depth: 2.5-14 mts)
• Tamil Nadu, Mandapam INDIA (Record: 07/2008-12/2008)
• Tamil Nadu, Keelakarai INDIA (Record: 07/2008-12/2008)
• Goa, Mandovi and Zuari Estuary INDIA
• Goa, Cumbarjua canal INDIA

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Page last updated on:2011-10-27

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