Acasta sulcata spinosa   Daniel,  1955 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Size: Basal diameter 6.5 mm; height 7.5 mm

Color: Pale white with a tinge of flesh color

Shell: The edge of the cup-shaped basis is crenated. Externally the parietes are provided with small calcareous projections. The bases of the inner surface of the parietes are ribbed. The carino-lateral parietes are very narrow, about 1/20th the width of the laterals. Scutum with the adductor ridge conspicuous and the articular ridge feebly developed. Tergum with the spur broad and square. The number of segments in the anterior and posterior rami of the cirri is as follows:
I cirrus- 15,6; II cirrus- 9,6; III cirrus- 11,10; IV cirrus- 14,19; V cirrus- 23, 23; VI cirrus- 27,28.
In the first pair of cirri the anterior ramus is thrice as long as the posterior. The second pair of cirri are very short and the third cirrus is about twice the length of the second but smaller than the first. The anterior ramus of the fourth cirrus is provided with recurved spines pointed downwards but are absent on the posterior ramus as is present in the typical form of Acasta sulcata Darwin.
The anterior ramus of the fifth cirrus is provided with recurved spines which is a peculiar feature for this species. The anterior ramus of the sixth cirrus also, in segments 9-20 has a single recurved spine. Each segment bears three pairs of spines.
Mouth parts: Labrum has a deep notch with three teeth on either side, but the outermost pair is placed lower than the peripheral margin.
Mandible with sixth teeth including the lower angle, the distance between the first and second teeth being almost equal to that between the second and third. The fourth and fifth teeth are very near to one another and to the basal margin. The lower margin bears fine hairs.
Inner maxilla with the free edge straight and with a pair of long spines at the apex and at the base. Five pairs of shorter spines are placed in between the longer pairs. Basis is cup-shaped with the orifice moderately small and toothed.

Synonym (s)
Acasta sulcata var. spinosa Daniel 1955

Common Name (s)
Economic Importance and Threats

Habitat:  Coastal


• Tamil Nadu, Tuticorin INDIA (Record: 25/11/2001)
• Tamil Nadu, Chennai, Royapuram INDIA (Record: 13/01/1951)

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:2012-05-21

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