Iophon unicorne Topsent 1907

• Main Authors: Göcke, Christian, Janussen, Dorte
• Format: Other/Unknown Material
• Language: unknown
• Published: 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Poecilosclerida; Acarnidae; Iophon; Iophon unicorne; Antarctic; Burton; Antarc*
• Online Access: https://zenodo.org/record/6145176; https://doi.org/10.5281/zenodo.6145176

Iophon unicorne Topsent, 1907 (Fig. 3 F) Iophon unicorne Topsent, 1907: 72. Boury-Esnault & van Beveren 1982: 87–89, fig. 25. Desqueyroux & Moyano 1987: 49. Desqueyroux-Faúndez 1989, 120, pl. 3, figs 17 a–d, pl. 12, figs. 68–70. Pansini et al. 1994: 75. Gutt & Koltun 1995: 231. Cattaneo-Vietti et al. 1999: 540. Campos et al. 2007 b: 745, figs. 10–17, tab. 2. Synonymy: Iophon spatulatum Kirkpatrick, 1907: 276, 1908: 29–30, pl. 21, figs. 5, 5a–c, pl. 25, figs. 5 a–d. Koltun 1964: 58, pl. 10, figs. 1 – 9, 1976: 182. Desqueyroux 1975: 64, pl. 3, figs. 36–40. Sarà et al. 1990: 254. Barthel et al. 1997: 48. Material. Several fragments of probably about 3 specimens from station 048- 1 (SMF 11807, 11812, 11845), 602.1 m, 70 ° 23.94 ' S, 8 ° 19.14 ' W, 12.01. 2008. Material examined for comparison: Iophon flabellodigitatum Kirkpatrick, 1907: BMNH 1908.2. 5.153, holotype, wet specimen, BMNH 1908.2.5.153.C, holotype, slide, BMNH 1908.2.5.153.K, holotype, slide, Colln of the National Antarctic Expedition HMS “Discovery”, described in Kirkpatrick 1908. Description. Our fragmentary specimens are massive sponges, overgrowing bryozoans. Skeleton consisting of an anisotropic reticulation of anisoxeas, not very well preserved in specimens, with a tangential ectosomal crust of tylotes. Spicules anisoxeas with the point on one end usually characteristically bent, 410–510 x 15 µm, slightly curved acanthotylotes with slender tyles at each end, usually bearing small terminal spines, 280–340 x 10 µm, palmate anisochelae with distally oriented spines on the top of the side with short alae, 15–17.5 µm, and bipocilla 10–12.5 µm. Remarks. This species has been recorded and documented several times (Topsent 1907; Burton 1929; Koltun 1964; as I. spatulatus, Boury-Esnault & van Beveren 1982, Campos et al. 2007 b) and can therefore be considered well-known. However, the taxonomy of the species is still problematic: Burton (1929) united all Antarctic Iophon spp. under the name of Iophonopsis radiatus (Topsent, 1901). This ...