Lepas gnanamuthui   (Daniel),  1971 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Size: Capitular length 14.0-14.4 mm; breadth 10.0-10.2 mm with the peduncle measuring 5.0-5.3 mm, in length and 3.5-3.6 mm, in breadth.

The capitulum is greatly swollen. The valves are placed rather distant from each other, excessively thin, brittle and covered by thin chitinous membranous base and is inwardly deflected at the apical region; the basal margin is strongly reflexed and produced into a rounded disc under the umbone. The tergum is flat with the scutal margin hollowed at the upper part and the occludent margin moderately arched outwards; the carinal margin is straight for most of its length except at the apical region where it is arched. The carina is angularly bent with the upper and lower parts of almost equal length; the upper part has a bluntly pointed apical tip and is broad at the base i.e., at the region of the umbo; it is concave within and furnished externally with a central ridge which is narrow at the apical end and comparatively broad at the base; the lower part is flat, almost of equal width with a slightly expanded semicircular base.
The peduncle is short, with wrinkled surface and devoid of spines. The labrum is bullate and fringed with a number of hairs. The palp is provided with several long setae on inner margin. The mandible bears six teeth including inferior angle and the entire lateral surface is clothed with strong setae; the lower margins of all teeth, upper margins and lateral surfaces of fourth, fifth and sixth teeth are armed with several strong denticles; upper margins of second and third teeth bear several weak denticles; the inferior angle (or sixth tooth) is provided with four prominent spines at tip of which one pair is very long. The first maxilla is stepformed, with the first step separated by a deep excavation and armed with one long stout spine followed by several thin and shorter spines; the three regular steps below bearing a row of spines. The lateral surface is clothed with numerous spinules. The superior and inferior margins bear numerous long and thin hair like setae. The second maxilla is elongated and clothed with long hair like spines along the entire margin.
The cirri are moderately long and only slightly curved. The number of segments in the rami is as follows:
Cirrus I: 10-11,11-12; Cirrus II: 12-14; 12-14; Cirrus III: 12-14; 12-14; Cirrus IV: 15-16; 15­ 16; Cirrus V: 16-18; 16-18; Cirrus VI: 19-20; 19-20.
The first cirrus have very unequal rami, the posterior ramus being two-thirds, as long as the anterior. The segments of both rami are protuberant and bear plumose setae along margin of entire segment. The second and third pairs of cirri are alike in shape and structure. The segments are not protuberant and bear long non-plumose setae. The fourth, fifth and sixth paires of cirri are alike in shape and structure. The anterior margin of each segment is protuberant at upper part which bears a pair of very long setae (longer than the length of the segment), a pair of moderately long setae below (slightly longer than the width of the segment), and several pairs of short setae. At the posterior distal end each segment is armed with two pairs of long, stout, curved spines, of which one pair is longer and stouter than the other and several pairs of thin straight spines below. Laterally, numerous fine bristles occur in the middle and at the posterior margin of each segment in lengthwise rows.
The caudal appendages are smooth with rounded summits. There are four filamentary appendages on either side. The penis is long, tapering distinctly annulated and bears setae and spines scattered over surface and at tip.

Synonym (s)
Lepas gnanamuthui Daniel 1971

Common Name (s)
Economic Importance and Threats



• Andaman and Nicobar Islands, Great Nicobar Island INDIA (Record: 2006)

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

Back to Search