Demospongiae of ANT XXIV / 2 (SYSTCO I) Expedition — Antarctic Eastern Weddell Sea Göcke, Christian Janussen, Dorte Zootaxa 2013 3692 1 28 101 3KNRY Topsent, 1901 Topsent 1901 [151,581,1586,1612] Demospongiae Niphatidae Hemigellius Animalia Haplosclerida 49 77 Porifera species bidens    Haliclona bidens(Topsent, 1901): Koltun 1964, 101.   Plumocolumetta bidens(Topsent, 1901): de Laubenfels 1936: 54.   Material. 1 specimenfrom station 048-1 (SMF 11793), 602.1 m, 70° 23.94' S, 8° 19.14' W, 12.01.2008.   Description.Specimen a tube-shaped fragment with a smooth surface. Choanosomal skeleton a poorly organized anisotropic reticulation; ectosomal skeleton of radial oxea bundles. Spicules oxeas, 600–690 x 15–20µm and sigmas with bifurcated ends, 40 µm in length and 16 µm in width.   Remarks.This well characterized species has been described and illustrated in detail by several authors, including Topsent (1901), Hentschel (1914), Koltun (1964) and Campos et al. (2007a). Our specimen accords well with those prior descriptions. The sigmas with bifurcated ends, so far only known from this species, are an absolutely distinct character differentiating the species from all other sponge taxa (Desqueyroux-Faúndez & Valentine 2002).