Balanus amphitrite amphitrite   Darwin,  1854 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

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

Scutum: Usually flat and occasionally concave between the apex and the basal margin; tergal segment narrowly inflected; basi-tergal angle obliquely truncate. Occludent margin usually toothed, more prominently at the lower half. Growth ridges, according to Henry and Maclaughlin (1975) are low, fine and often crenulate; longitudinal striae occasionally present; inner surface always roughened on upper part; articular ridge prominent and about half the length of the tergal margin; and usually bluntly pointed; articular furrow wide and striated; adductor ridge moderately long and parallel to the occludent margin; adductor muscle pit small, shallow and from oval to nearly circular in outline; lateral depressor muscle pit very shallow and open at the base.
Tergum: Scutal margin prominently denticulated at lower margin; carinal margin protuberant in upper third to half and highly ridged; occasionally protuberant, separated from the rest of the valve by a narrow groove, growth ridges fine, strong and granulated near the lower scutal margin; sometimes very slight longitudinal striae on the carinal side; spur fasciole usually shallow and in level with the carinal and scutal surface of the tergum; sometimes, spur fasciole separated from scutal as well as carinal side by a narrow groove at the lower half; spur usually obliquely truncated in smaller specimens and almost rounded in older specimens; basal margin usually straight on both sides of spur; occasionally slightly concave on scutal side, rarely on carinal side.
Mouth parts-Labrum: Deeply notched with an highly hairy crest; number of teeth varied from 13 to 22 on each side concentrating down into the notch and gradually decreased in size; lateral surface of labrum provided with long, dense and obliquely directed setae.
Mandible: Five teeth, upper three teeth sharp and well developed, the fourth and fifth usually had cusps with the inferior angle slightly spinous; upper and lower margins bear short and fine setae; lateral surfaces along the cutting edge with fine spinules.
Inner maxilla: Cutting edge straight; very rarely the lower edge slightly produced with a pair of long and stout spines; upper pair of spines stout but not shorter than the lower ones; upper and lower margins with fine setae.

Synonym (s)
Balanus amphitrite var. communis Darwin 1854
Balanus amphitrite communis Nilsson-Cantell 1921
Balanus amphitrite forma hawaiiensis Broch 1922
Balanus amphitrite cochinensis Nilsson-Cantell 1938a
Balanus amphitrite venustus Sundara Raj 1927
Balanus amphitrite var. hawaiiensis Stubbings 1963b
Balanus amphitrite var. cochinensis Karande & Palekar 1966

Common Name (s)
Economic Importance and Threats



• West Coast INDIA (Record: 2006)
• Maharashtra, Mumbai INDIA (Record: 2001)
• Maharashtra, Bandra INDIA (Record: 2001)
• Andhra Pradesh, Vishakhapatnam INDIA (Record: 2001)
• West Bengal, Digha INDIA (Record: 2002)
• Orissa, Puri INDIA (Record: 2002)
• Kerala, Kochi INDIA (Record: 1978)
• Tamil Nadu, Pichavaram INDIA (Record: 1976)
• Maharashtra, Madh Island INDIA (Record: 2001)
• Tamil Nadu, Mudasalodai INDIA (Record: 1998)
• East 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 -
  • Pati, SK; Rao, MV; Balaji, M and Pachu, AV (2011) Community Structure of fouling on a sunken vessel from Visakhapatnam harbour, east coast of India Journal of the Marine Biological Association of India The Marine Biological Association of India 53(1) 14-20 Available at - NIO,Goa

Page last updated on:2012-05-22

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