First record of a living species of the genus Janulum (Class Demospongiae) in the Southern Hemisphere Author Kelly, Michelle Author Erpenbeck, Dirk Author Morrow, Christine Author Soest, Rob Van text Zootaxa 2015 3980 2 255 266 journal article 10.11646/zootaxa.3980.2.6 93c6c6a8-9f68-49db-8ac5-75663b8da7c2 1175-5326 236017 A09C107C-3F36-44A3-AE6D-339D0D2E4ED9 Genus Janulum de Laubenfels Janulum de Laubenfels, 1936 : 79 . Type species. Janulum spinispiculum ( Carter, 1876 ) ( type by original designation). Diagnosis. Encrusting sponges with a smooth or lobed to columnar, distinctly punctate surface, with a firm to crisp, fragile texture in life. Colour in life ranges from pale yellow to cream to translucent pale blue. Choanosomal architecture consists of a single category of peculiar spined strongyles arranged in a delicate isodictyal reticulation of single spicules. Ectosome a tangential isodictyal reticulation. Spined strongyles are straight or bent abruptly at each end; typically ends bend to the same side of the spicule but may also bend to opposite sides. Strongyles possess sharp concave spines concentrated in the middle of the strongyle, ends are rounded, smooth, slightly expanded. Spines project perpendicular to the shaft and are aligned in what appear to be short linear spiralling arrays. A few spicules, often thin and immature, may be entirely smooth (modified and expanded from Vacelet (1969) and Boury-Esnault et al. (1994 )).