Octolasmis cor var. A   (Aurivillius),  1893 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Image copyrights: Ocean Science and Technology Cell, CUSAT, Kochi

Size: Capitular length 3-3.5 mm, breadth 2 mm; peduncle length 3.5 mm and breadth 1.0 mm.

Capitulum ovoid, slightly compressed, semitransparent, smooth in young and dotted with symmetrically arranged chitinous points in old specimens; close to apex, carinal margin slightly depressed; carinal margin of occludent segment of the scutum near the apex bears brown to orange pigments. Carina narrow and feebly developed, almost straight and proportionately longer with growth; basal end branched and turned upwards towards the scutum, inner base where the branches emerge depressed into triangular concavity.
Tergum completely absent. Scutum with two arms; vertical occludent arm almost linear; considerably broader in the middle than at its base; basal arm broader in the middle than at its base with the extremity usually truncate; in larger specimens the basal arm becomes heavier and unequally bifid at the extreme. Peduncle cylindrical, slightly wrinkled; usually longer than the capitulum, becoming broader along the base; smooth in young specimens; in adults with chitinous points as in the capitulum in adults.
Caudal appendages laterally compressed with rounded tip bearing dense apical fringe of hairs extending down the posterior margin; reaches the first basal segment of the sixth cirrus with tufts of hairs reaching third basal segment of sixth cirrus.
Mouth parts: Labrum: According to Annandale (1909) the labrum is neither bullate nor with a row of chitinous teeth above, but minutely ornamented with chitinous points in some individuals. Daniel (1955c) described the labrum as bullate but he has not mentioned about the presence of teeth. Fernando (2006) observed the labrum is distinctly bullate with a row of 20-23 prominent conical teeth usually larger at extremities of crest than at the centre. Newman (1960b) confirmed the presence of bullate structure and a row of the fine teeth in much the same manner as Octolasmis angulata.
Mandible: With five teeth, not including inferior angle; first teeth larger than rest; almost equal in size and widely separated from first. In some specimens base of fifth teeth support one or two small additional teeth; superior margin slightly sinuate at two regions, each with a cluster of fine hair; inferior angle with fine hair; body of the mandible covered with minute setae.
Inner maxilla: Cutting edge almost straight; upper spine larger and longer than the following double row of about 8-10 spines; spines interspersed with numerous spinules; superior margin sinuate at five regions with clusters of 2-3 setae in each; inferior margin slightly arched and bears a pair of clusters of 2-3 fine setae in each; body surface covered with fine setae.

Synonym (s)
Dichelaspis cor Aurvilius 1893
Dichelaspis maindroni Annandale 1909
Dichelaspis maindroni Gruvel 1902
Octolasmis cor Arudpragasam 1967
Octolasmis cor Barnard 1924
Octolasmis cor Newman 1960

Common Name (s)
Economic Importance and Threats



• Tamil Nadu, Chennai (Lat: 13.09) (Long: 80.29) INDIA
• West Bengal, Sundarbans (Lat: 21.5) (Long: 88.17) INDIA
• Kerala, Kochi Backwaters INDIA (Record: 2006)
• Tamil Nadu, Parangipettai INDIA (Record: 2002)
• Arabian Sea (Record: 2006)
• Bay of Bengal (Record: 2006)
• West Coast INDIA (Record: 2006)
• Tamil Nadu, Gulf of Mannar INDIA (Record: 2003)
• East Coast INDIA (Record: 2006)

Literature Source(s)
  • Mandal, AK and Nandi, NC (1989) Fauna of Sundarban mangrove ecosystem, West Bengal, India Fauna of Conservations 3 35431 Available at - NIO, Goa
  • Jeffries, WB; Voris, HK and Chang Man Yang (1985) Growth of Octolasmis cor (Aurivillius, 1892) on the gills of Scylla serrata (Forskal, 1755) The Biological Bulletin (Woods Hole) 169 (1) 291-296 Available at - Zoological Records
  • Jeffries, WB; Voris, HK and Chang Man Yang (1982) Diversity and distribution of the pedunculate barnacle Octolasmis in the seas adjacent to Singapore Journal of Crustacean Biology 2 (4) 562-569 Available at - Zoological Records
  • Mohan RSL; Dey, SC and Bairagi, SP (1998) On a resident population of the Ganges river dolphin, Platanista gangetica Journal of the Bombay Natural History Society 95(1) 39820
  • Jothinayagam, JT (1987) Cephalopoda of the Madras cost (Zoological Survey of India) Technical monograph no 15 The Director ZSI, Calcutta 85
  • 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
  • Marine Biological Station, Chennai, Tamil Nadu (2003) Checklist of marine fauna of Tamil Nadu Department of Environment, Government of Tamil Nadu Available at - http://tnenvis.nic.in

Page last updated on:2012-05-22

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