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Van Soest and Hooper, 1993

Species Overview

Rhabderemia gallica Van Soest and Hooper (1993) is a thinly encrusting sponge of which no further macroscopical details are known. It has distinctive spiculation. Recorded from Roscoff and the Mediterranean.

Taxonomic Description

Colour: Not recorded.
Shape, size, surface and consistency: Encrusting (no further macroscopic details recorded).
Spicules: Megascleres: Rhabdostyles entirely smooth, with compact tightly coiled rhabdose end, (unusually short in the Mediterranean specimens, larger in the Roscoff specimens), sometimes rhabdostyles are deformed into right-angled spicules: 57-102-178 x 4-5 µm; microstyles, rugose, thin, often with small subterminal tyle: 55-70.3-99 x 0.5-1.5 µm. Microscleres: Thraustosigmas, small, irregularly curved: 17-21 µm.
Skeleton: Ectosomal: Not recorded. Choanosomal: Single megascleres erect on the sub-
strate.
Ecology: At intermediate depths (60 m).
Distribution: Mediterranean-Lusitanian, so far known only from French waters.
Etymology: Gallia is the Roman name for France.
Type specimen information: Holotype in the Paris Museum, MNHN DT 115, Ile Grosse, Banyuls, Mediterranean coast of France; paratype also in the Paris Museum, MNHN DCl. 874, Roscoff, N of Ile de Batz, Atlantic coast of France.

Remarks

The species differs from Caribbean R. minutula s.s. in that it possesses thraustosigmata and relatively small megascleres. It shares these characters with the Indian Ocean species R. burtoni Van Soest and Hooper, 1993 (= R. pusilla sensu Dendy, 1922), from which it differs in the entirely smooth condition of the rhabdostyles and the shorter microstyles (up to 135 µm in R. burtoni).
From the Mediterranean-Atlantic R. topsenti Van Soest and Hooper, 1993 (= R. minutula sensu Pulitzer-Finali, 1983) the species differs in having thraustosigmata, which are also considerably larger than the small contorted sigmata of R. topsenti, and the larger microstyles.
Source: Van Soest and Hooper, 1993

Rhabderemia gallica