Octolasmis angulata   (Aurivillius),  1893 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

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

Size: Capitular length 4 mm; breadth 3.4 mm; peduncle length 2 to 9 mm and breadth 1.2 mm.

Color: Usually transparent and colorless; specimen with egg lamellae appeared pink and bulky.

Capitulum rounded with prominent lobes above the aperture which is sometimes transverse; external surface covered with numerous fine chitinous points.
Tergum: Represented occasionally by a chitinous patch conspicuous owing to its yellowish tint.
Scutum: Various in size and shape from young to old specimens; usually much calcified in grownup specimens; in young, represented only by wide and long vertical branch, with a sinuous branch meeting vertical branch at a wide angle.
Carina: Often quite rudimentary but present in all specimens; in large specimens, dorsal edge faintly sinuous. Annandale (1909) observed a fork at the basal part of the carina in some specimens. Fernando (2006) observed forked carina.
Peduncle: Usually short and stout: occasionally with long and slender peduncle; much broader at base than at its junction with capitulum.
Caudal appendages: Single jointed, compressed, broad and reaching as far as the apex of the pedicel of the sixth cirri; bears a dense tuft of long hairs on tip; several groups of stout and short hairs on posterior edge of distal half.
Mouth parts: Labrum: Annandale (1909) described that the labrum is by no means bullate bearing only a tuft of hairs at the distal extremity. He has not mentioned the presence of teeth. Nilsson-Cantell (1934a), reported the presence of teeth on the labrum in two rows. Hiro (1937a) observed 10-15 strong teeth along the concave margin in a single row. Daniel (1955c) has not described the mouth parts of this species. In the present study the labrum is distinctly bullate with the crest bearing a row of 22-24, closely spaced, small, conical teeth.
Mandible: With 5 teeth, including the inner angle, occasionally bifid, superior margin with three clusters of soft setae; inferior margin slightly sinuous with clusters of soft setae in a row tucked in each sinus of the wavy edge; body surface covered to a greater extent with moderately slender setae interspersed with serially arranged fine short setae.
Inner maxilla: Cutting edge straight, with a double row of 10-12 stout spines decreasing in length and size from above downwards, interspersed with fine spinules; body surface with several transverse rows of stout and short setae denser near lower region; superior margin distinctly wavy with clusters of fine setae equally spaced over half of the length; inferior margin slightly sinous with a tuft of setae placed in a row.

Synonym (s)
Dichelaspis angulata Aurvilius 1894
Dichelaspis angulata Nilson-Cantell 1938a
Dichelaspis aperta Aurvilius 1894
Dichelaspis bullata Aurvilius 1893
Dichelaspis cuneata Aurvilius 1894
Dichelaspis transversa Annandale 1906b
Dichelaspis angulata Annandale 1909a
Octolasmis angulata Nilsson-Cantell 1938a

Common Name (s)
Economic Importance and Threats



• Tamil Nadu, Chennai (Lat: 13.09) (Long: 80.29) INDIA
• Tamil Nadu, Chennai INDIA (Record: 2006)
• Tamil Nadu, Krusadai Island INDIA (Record: 2006)
• Tamil Nadu, Parangipettai INDIA (Record: 2002)
• Orissa INDIA (Record: 2006)
• Maharashtra, Mumbai INDIA (Record: 2002)
• Tamil Nadu, Tuticorin INDIA (Record: 2006)
• Tamil Nadu, Gulf of Mannar INDIA (Record: 2003)

Literature Source(s)
  • 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
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • 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
  • Voris, HK; Jeffries, WB and Poovachiranon, S (1994) Patterns of distribution of two barnacle species on the mangrove crab, Scylla serrata Biological Bulletin (Woods Hole) 187(3) 346-354 Available at - Zoological Records
  • 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
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at - http://tnenvis.nic.in/PDF/coastal%20data.pdf

Page last updated on:2012-05-21

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