Free Content A new species of Thrombus (Porifera: Demospongiae: Astrophorida) from Trinidad, West Indies

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A new species of the sponge genus Thrombus (Porifera: Demospongiae: Astrophorida) is described from a single specimen collected at a depth of 21.5 m on a hard bottom off Monos Island, located off the northwest coast of Trinidad, W. I. The sponge lives symbiotically with a species of vermetid gastropod, Siliquaria modesta Dall. The associated organisms form a mound measuring 2 m in diameter, covering an area of about 3.2 m2. Named Thrombus sphaeroidocladus, the sponge is the only species of the genus with representatives of all three categories of spicules known for the genus, namely, simple acanthotriaenes, acanthotrichotriaenes and amphiasters. Also diagnostic is the abortive nature of the clads of the simple acanthotriaenes.

Document Type: Research Article

Publication date: January 1, 1999

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