Echinothrix calamaris

Scientific Name:-
Echinothrix calamaris

Common Name:-
The Hatpin Urchin

Malayalam Name:-
Kadal pencil/Kadal chena




Test and spines black coloured. Test firm and flattened. Slender, large, needle like, hollow, cylindrical, easily brittle spines. Primary tubercles perforate and crenulate. Cavity of primary spines large. Externally the spines with transverse series of thorns. Large spines confined to broad interambulacrum and banded at the tip. Secondary spine fine, needle like, scattered among the primary spines. Ambulacra distinctly bulging aborally, with naked interambulacral areas between them apically. Longitudinal ridging evident. Periproct with a tubular extension. Pore pairs arranged in arcs throughout.


Not recorded


From Kerala coast, this species was reported from Vizhinjam and Kovalam (Jayakumari, 2004 and James, 2007).


Shallow intertidal region of depth 10m


Echinus calamaris Pallas, 1774; Astropyga calamaris (Pallas, 1774); Cidaris calamaris (Pallas, 1774); Cidaris calamaria (Pallas, 1774); Diadema calamaria (Pallas, 1774); Diadema calamare (Pallas, 1774); Diadema calamarium (Pallas, 1774); Echinus calamarius Pallas, 1774; Diadema desori (L. Agassiz & Desor, 1846); Astropyga desori (L. Agassiz & Desor, 1846); Echinothrix desori (L. Agassiz & Desor,1846); Echinothrix desorii (L. Agassiz & Desor,1846); Echinothrix annellata Peters, 1853; Garelia aequalis Gray,1855; Garelia clavata Gray, 1855; Savignya frappieri Michelin, 1862; Diadema frappieri (Michelin, 1862); Echinothrix aequalis A. Agassiz, 1863; Echinothrix aperta A. Agassiz, 1863; Echinothrix scutata A. Agassiz, 1863; Echinothrix clavata Bolsce, 1865


Clark, A. M and F.W.E. Rowe 1971. Monograph of shallow-water Indo West Pacific echinoderms. London. 238 pp.
James, D. B. 2007. Echinoderms of the West Coast of India. Fishing Chimes, 27(7): 19- 21.
Jayakumari, M. 2004. Studies on the ecophysiology of echinoderms along the coast of Kerala. Ph.D. Thesis submitted to the University of Kerala,. 226pp.
Sastry, R. K. (2007). Echinodermata of India: An annotated check list . Rec. zool. Surv. India. Occ. paper No.271: 1-387

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