Genus Jenkina BrØndsted, 1931 TYPE SPECIES. — Leucandra hiberna Jenkin, 1908 by subsequent designation (Laubenfels 1936). DIAGNOSIS. — Jenkinidae with a simple tubular body and a sylleibid or leuconoid organization of the aquiferous system. The choanoskeleton is composed of the unpaired actine of subatrial spicules and, occasionally, the proximal part of radial diactines that cross the sponge wall. DESCRIPTION BrØndsted (1931) proposed the genus Jenkina for a group of sponges described by Jenkin (1908a) and by himself from Antarctica. These sponges are wellcharacterized by an inarticulate choanoskeleton that contains unpaired actines of subatrial spicules and occasionally radial diactines, which cross the thin choanoderm and protrude from the external surface of the sponge. The thin choanosome frequently lacks a typical leuconoid aquiferous system, and some doubt remains about the division between the genera Breitfussia and Jenkina.

Published as part of Borojevic, Radovan, Boury-Esnault, Nicole & Vacelet, Jean, 2000, A revision of the supraspecific classification of the subclass Calcaronea (Porifera, class Calcarea), pp. 203-263 in Zoosystema 22 (2) on pages 230-231, DOI: 10.5281/zenodo.5392175