Solidobalanus (Solidobalanus) socialis   (Hoek),  1883 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Size: Diameter of base approx 5 mm; height is half the length.

The walls as well as the basis are permeated by pores; the radii, however, are not permeated. It has a tergum of highly characteristic form. It is hollow; it has a membranous wall within the outer thick wall. The form of the shell is deep-conical; the orifice is slightly toothed and comparatively large; when closed the opercular valves are nearly horizontal, parallel at least to the surface of attachment. The surface of the different compartments is smooth, but it is covered by a mud-like granular substance, which cannot so easily be taken away, and therefore probably is attached to a very thin and rudimentary membrane. The compartments do not show the growth-ridges very distinctly, but the opercular valves do. The internal surface of the parietes is very strongly ribbed in the lower part.
The radii are very narrow, the sutural edges are smooth; summits very oblique and rounded; the alae are rather broad, and have the summits not oblique but straight, and parallel to the basis of the shell; the alae extend only very slightly above the level of the opercular membrane. The parietal tubes are very narrow; in the upper part of the walls they are filled up and solid. The basis is very thin, the layers which compose it are extremely thin and fragile; the tubes of the base run radially outwards from the centre to the periphery of the base; the tubes are extremely narrow, and as the base is too thin to permit of a transverse section, the presence of the tubes is always to a certain degree problematic.
The scutum is triangular; its occludent margin is slightly toothed, which is caused by the projection of the growth-ridges. The articular ridge is not very prominent, but it extends rather far downwards; the adductor ridge is hardly visible, the pit for the lateral depressor muscle and that from the adductor muscle are both very flat. The tergum is well characterized by the length of the basal margin, which surpasses that of the scutal margin; the two parts into which the basal margin is divided by the spur form together a straight line. The spur is horst, broad, and bluntly truncated. The carinal margin is arched; the crests for the depressor muscle are very distinct. The articular furrow is not very deep, but distinct. The apex is not at all beaked.

Synonym (s)
Balanus socialis Hoek 1883
Balanus acneas Gruvel 1905
Balanus acneas Annandale 1906
Balanus acneas Hoek 1913
Balanus acneas Lanchester 1902
Balanus socialis Nilsson-Cantell 1932
Balanus socialis Nilsson-Cantell 1938a
Balanus socialis Hiro 1932
Balanus socialis Stubbings 1963
Balanus socialis Utinomi 1949

Common Name (s)
Economic Importance and Threats



• Tamil Nadu, Gulf of Mannar 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 -

Page last updated on:2012-05-22

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