Conchoderma indicum   Daniel,  1953 (Barnacle)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Arthropoda
Class: Maxillopoda
Order:Pedunculata
Family:Lepadidae

Description
Size: Length of capitulum 2.4 mm; breadth of capitulum 1.2 mm; length of peduncle 1.8 mm; breadth of peduncle 0.9 mm
Capitulum is broadly oval, somewhat bulbous, gradually blending into the peduncle, occludent margin being sinuous and tapering inwards at the apex, carinal margin broadly convex with the apical end being protuberant. Capitular membrane thickened, valves very thin and brittle and embedded in membrane.
Valves: Scutum is almost triangular and is not ‘Y’ shaped with the occludent side being moderately arched with the upper carinal side being sinuous and the lower carinal side being straight. The apical end of the scutum is beaked.
Tergum is not present as a valve but the membrane at the place where it occurs in the other species of the genus is considerably thickened.
Carina is present as a very thin streak and it is displaced more towards the upper half of the capitulum.
Peduncle is transparent.
Cirri: The number of segments in the anterior and posterior rami of the cirri is as follows:
I cirrus-6,6; II cirrus-10,10; III cirrus-14,14; IV cirrus-14,14; V cirrus-16,16; Vi cirrus-17,17.
The first pair of cirri is far removed from the other pairs. The anterior margins of both rami are protuberant. The 2nd pair of cirri has 10 segments in each rami, the basal 6 segments are highly protuberant along the anterior margin. Each segment bears 5 pairs of spines along the anterior margin and two pairs of smaller spines at the distal tip of the posterior margin. The last segment of both rami bears 3 long spines of which one is pectinate. The 3rd to the 6th pairs of cirri are alike in shape and structure, with the anterior margins protuberant. Each segment bears six pairs of spines along the anterior margin and is provided with 4 pairs of shorter spines at the distal tip of the posterior margin.
Filamentary appendages: there are 6 filamentary appendages on each side arranged at the basal articulations of the 1st to the 6th pairs of cirri.
Mouth parts: (i) Labrum: Broad and fringed with a number of hairs.
(ii) Mandible: bears 5 teeth at the free edge and the upper margin of the 2nd tooth bear 4 spines.
(iii) Maxilla: five stepped, the lowermost step bearing only slender bristles, while the middle three bears three pairs of spines, the uppermost bearing only two pairs of spines; and the apical tip of the free edge is provided with a single large spine.


Synonym (s)
Conchoderma indicum Daniel 1953

Common Name (s)
Economic Importance and Threats

Ecology

Biogeography


• INDIA (Record: 2006)
• Tamil Nadu, Krusadai Island INDIA (Record: 1951)

Literature Source(s)
  • Fernando, SA (2006) Monograph on Indian Barnacles Ocean science and technology Cell, Kochi 9-199 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org

Page last updated on:2012-05-21

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