Chelonibia patula   (Ranzani,  1820) (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

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

Size: Maximum basal diameter 25-30 mm

Color: Shell white in color.

Shell: Shell is conical, thin and fragile; loosely cemented to the carapace of the host leaving no impression when removed; parietes thin, and slightly convex; radii broad and smooth with oblique summits; hexagonal orifice covered with thick opercular membrane carrying the elongated opercular valves in the middle.

Scutum: Narrow and elongate without longitudinal furrow; growth lines deeply sculptured; articular ridge feebly developed; articular furrow wide and shallow; adductor pit distinct; occludent margin slightly inflected with conspicuous square ridge gradually widening downwards from the apex.
Tergum: Sub-triangular with truncated summit; successive growth lines differentiated by burrows; carinal margin convex, articular ridge developed; articular furrow obliquely striated. The tergoscutal valves translucent without any pigmentations; comparatively narrow than that of Chelonibia testudinaria.

Mouth parts- Labrum: Highly hairy with a shallow median notch; a row of 22-23 prominent teeth on either side of the labral crest; mid lateral surfaces with numerous, obliquely directed setae.

Mandible: With five teeth, third and fourth teeth seldom bifid; dorsal edge of the last three teeth studded with a row of few minute teeth; below the fifth tooth, the lower edge is provided with a number of strong spines, few of which minutely serrated at the base; margins with fine setae, and numerous strong spinules.

Inner maxilla: Cutting edge straight with three long and stout upper spines followed by a row of 10-12 small spines of varying length in the centre; below these a pair of slender spines, almost equal in length with the upper spines; lower edge with a number of short and slender spinules with very finely pectinated tips; lower margin highly arched with numerous setae; upper margin and the body surface near the cutting edge bears long setae.

Synonym (s)
Chelonibia patula Darwin, 1854
Chelonibia patula Nilsson-Cantell, 1938a
Chelonibia patula Nilsson-Cantell, 1934b
Chelonibia patula Pilsbry, 1916
Chelonibia patula Ranzani, 1818

Common Name (s)
Economic Importance and Threats

Habitat:  Estuarine, Coastal


• Tamil Nadu, Chennai (Lat: 13.09) (Long: 80.29) INDIA
• Tamil Nadu, Chennai INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Tamil Nadu, Parangipettai INDIA
• Tamil Nadu, Pulicat Lake INDIA
• Maharashtra INDIA
• Tamil Nadu, Tuticorin INDIA
• Tamil Nadu, Pamban INDIA

Literature Source(s)
  • NillssonCantell, CA (1938) Cirripedes from the Indian Ocean in the collection of the Indian Museum, Calcutta Memoirs of the Indian Museum The Manager of Publications, Delhi 13 29587 Available at - NIO, RC, Kochi
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • 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 -
  • Marine Biological Station, Chennai, Tamil Nadu (2003) Checklist of marine fauna of Tamil Nadu Department of Environment, Government of Tamil Nadu Available at -
  • 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 -

Page last updated on:2010-07-02

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