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Topsent, 1892b

Species Overview

Hymerhabdia typica Topsent (1892b) is a thin yellow or orange, hispid crust, recognizable only after microscopic examination. It occurs in southern deep water.

Taxonomic Description

Colour: Yellow or dark orange.
Shape, size, surface and consistency: Thinly encrusting with bumpy and slightly hispid surface. Size 2 x 1.5 x 1 cm. No apparent oscules.
Spicules: (Hymerhabdia typica spics) Tylostyles, smooth, straight, with well-developed heads: 500-800 x 3-13 µm. Rhabdostyles and centrotylote oxeas, smooth, strongly recurved and spirally twisted: 120-300 x 4-5 µm.
Skeleton: The tylostyles are erect on the substrate, with their heads embedded in a layer of rhabdostyles and curved oxeotes.
Ecology: Deep water, from 15 m downwards.
Distribution: Mediterranean, Azores, Roscoff.
Etymology: typicus (Greek)= conformable, referring to the thin shape following the contour of the substrate.
Type specimen information: The type is in the Monaco Museum, with a slide in the Paris Museum.


This species differs from its congener H. intermedia in the smaller rhabdostyles and the possession of centrotylote oxeas in stead of strongyles. The latter are less strongly curved.
Source: Carballo and Garcia-Gómez, 1994

Hymerhabdia typica