Octolasmis grayii var. pernuda   Annandale,  (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Size: Capitular length 4.5 mm, breadth 3.5 mm; peduncle length 5.5 mm and breadth 0.9 mm.

Color: Specimens with egg lamellae are reddish brown.

Capitulum: Bonnet shaped with a protruding lobe; body highly transparent especially near the apex and occludent region. Valves almost absent; represented only by outlines of their growth as thin plates when stained.
Peduncle: Usually longer (6 mm) than capitulum, cylindrical, slender and soft.
Cirri: Few basal segments of the 4th, 5th, and 6th cirri scaly.
Caudal appendages: Unsegmented, slender and very long, reaching half the length of the sixth cirrus; upper end with a bunch of long hairs; with few scattered hairs along the posterior margin.
Mouth parts: (i) Labrum: Distinctly bullate, with a row of 15-20 conical teeth closely spaced in the middle of the crest.
(ii) Mandible: Narrow with five sharp teeth including the inferior angle; fifth teeth smaller and usually wavy on either side and produced into one or two sharp spines; cleft between fourth and fifth teeth very narrow and moderately deep; superior margin with six clusters of fine hairs; a row of fine hairs along the whole inferior margin; body surface covered with fine hairs concentrating more numerously towards base of last 3 teeth.
(iii) Inner maxilla: Cutting edge below upper pair of long and stout spines, notch shallow, usually a minute spine present below upper pair; lower edge below notch bears 7-8 long and slender spines with minute spinules interspaced; a slender and short spine present in the notch; superior margin sinuous, bearing seven clusters of long fine setae in each; posterior margin slightly arched with numerous fine setae; body surface covered with minute setae arranged in transverse rows.

Synonym (s)
Dichelaspis grayii var. pernuda Annandale 1909a

Common Name (s)
Economic Importance and Threats



• Tamil Nadu, Parangipettai INDIA (Record: 17/05/1970) (Depth: -(36.57-54.86) mts)
• Tamil Nadu, Chennai Coast 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

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