Microxina benedeni Topsent 1901
Microxina benedeni (Topsent, 1901) (Fig. 18, Tab. 14) Microxina benedeni (Topsent, 1901): Koltun 1964: 107, pl. 15, fig. 14 –16, 1976: 196. Desqueyroux-Faúndez & Valentine 2002: 885–886, fig. 7 d. Synonymy: Gelliodes benedeni Topsent, 1901: 16, pl. 2, fig. 3, pl. 3, fig. 5. Gellius benedeni (Top...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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2013
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| Online Access: | https://zenodo.org/record/6145341 https://doi.org/10.5281/zenodo.6145341 |
| Summary: | Microxina benedeni (Topsent, 1901) (Fig. 18, Tab. 14) Microxina benedeni (Topsent, 1901): Koltun 1964: 107, pl. 15, fig. 14 –16, 1976: 196. Desqueyroux-Faúndez & Valentine 2002: 885–886, fig. 7 d. Synonymy: Gelliodes benedeni Topsent, 1901: 16, pl. 2, fig. 3, pl. 3, fig. 5. Gellius benedeni (Topsent, 1901): Burton 1929: 423, 1932: 271, pl. 50, fig. 1, text-fig. 10. Material. 1 specimen from station 048- 1 (SMF 11836), 602.1 m, 70 ° 23.94 ' S, 8 ° 19.14 ' W, 12.01. 2008. Material examined for comparison: BMNH 1928.2. 15.112, “Discovery” Investigations, Antarctic, 1925–1928, stn. 149, R.N. XLII. i., wet specimen. Description. Complete specimen (Fig. 18 A–B) growing on a bryozoan colony. Basis very narrow, growing on bryozoan, and widening towards top. Body form club-shaped with slightly rounded top. Specimen 40 mm long and up to 20 mm wide. Surface distinctive; bearing many thin conules made up of skeletal fibres, running longitudinally throughout epidermis. These hair-like conules reaching a length of about 5 mm with a diameter of about 0.5 mm, occuring quite densely and regularly distributed, about 2 mm apart. On top side, two large oscules present (Fig. 18 B), several additional oscules/pores occuring scattered all over the surface. Inside the sponge a rather large cavity. Colour in ethanol dirty yellowish white, texture very firm and hard. Skeleton: Skeleton (Fig. 18 C–D) plumose with thick solid tracts of oxeas, running mainly towards surface, branching off not very regularly. Tracts piercing the normal surface level and forming erect long conules. Tissue including large numbers of sigmas and sand grains. Spiculation (Tab. 14): Main spicules almost straight oxeas (Fig. 18 E) with sharp ends and a relatively characteristic shape, tapering straightly from thick centres to the ends. Oxeas 760 to 980 µm long and 35 to 42.5 µm in diameter. Microscleres exclusively c-shaped sigmas (Fig. 18 F–G), 47.5 to 62.5 µm in length and 22.5 to 27.5 µm in width. parameter SMF 11836 Topsent (1901) Burton (1929) Koltun ... |
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