Anamixilla Poléjaeff, 1883

Borojevic, Radovan, Boury-Esnault, Nicole & Vacelet, Jean, 2000, A revision of the supraspecific classification of the subclass Calcaronea (Porifera, class Calcarea), Zoosystema 22 (2), pp. 203-263 : 232

Genus Anamixilla Poléjaeff, 1883

TYPE SPECIES. — Anamixilla torresi Poléjaeff, 1883 by monotypy.

DIAGNOSIS. — Jenkinidae with a syconoid organization. The thick cortex is supported by many layers of triactines. The choanoskeleton is composed of the unpaired actine of the subatrial spicules, and giant tangential triactines similar to those in the cortex but lying scattered in the choanosome.

DESCRIPTION

In Anamixilla , large triactines form a thick cortex and apparently invade the choanosome ( Fig. 28 ). A similar phenomenon is observed in the Lelapiidae , in which the reduction of the classical choanoskeleton is concomitant with its partial substitution by large cortical diactines. Large diactines have been observed in the oscular region of A. irregularis Burton, 1930 . We have examined the specimen deposited in the British Museum (BMNH 1929.8.30.6) and found that it does not belong to the genus Anamixilla .

Figures

FIG. 28. — Diagram of a transverse section through the wall of Anamixilla torresi Poléjaeff, 1883. Abbreviations: a, atrium; as, atrial skeleton; ss, subatrial spicule; ch, choanosome; cx, cortex (from Poléjaeff 1883).