Siphonosphaera brachysiphonia DUMITRICA 1978

• Main Author: Dumitrica, Paulian
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Chromista; Radiozoa; Polycystina; Nassellaria; Collozoidae; Siphonosphaera; Siphonosphaera brachysiphonia; Antarc*; Antarctic; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.10590614; http://treatment.plazi.org/id/591287900A43DE031B7B9507FF03FD39

Siphonosphaera brachysiphonia Dumitrică, 1978 Figs. 1 a-h 1978b Siphonosphaera brachysiphonia Dumitrică nov. sp., p. 235, pl. 5, fig. 1. 1982 Siphonosphaera arkys Su nov. sp., p. 276, pl. 2, figs. 3, 4. 1990 Collosphaerid sp. A – Abelmann, p. 690, pl. 1, fig. 2. 1992 Siphonosphaera magnisphaera ? Takahashi, part. – Lazarus, p. 795, pl. 2, figs. 9-10; pl. 5, figs. 13-14, non figs. 11-12. 1999 Siphonosphaera arkys Su. – Tan & Chen, p. 139, pl. 5, fig. 41. 2001 Trisolenia sp. - De Wever et al., p. 170, Fig. 104.2. Description . Shell spherical, exceptionally ellipsoidal with thin wall perforated by a small number (some 10-15 or more) of wide pores with margins prolonged outside in very short tubes. Surface of test covered with numerous and dense minuscule pits. These pits disappear on the tubes, their surface remaining smooth. Dimensions : Diameter of shell 120-180 μm. Etymology . From the Latin brachys – short and siphon – tube, pipe. Remarks . Siphonosphaera arkys Su resembles perfectly Siphonosphaera brachysiphonia Dumitrică (see Figure 1 i-h) by its shape, number, shape and length of tubes and pitted surface of shell, and is undoubtedly a junior synonym of the Badenian species. These pits were considered pores by Su, but they are certainly just a superficial ornamentation. The same species was illustrated by Abelmann (1990, pl. 1, fig. 2) as collosphaerid sp. A from the Middle Miocene of the Antarctic area (Maud Rise, Weddell Sea). A very close species to S. brachysiphonia Dumitrică is Siphonosphaera magnisphaera Takahashi, 1991 (not Lazarus 1992) by being spherical, by having pitted surface except the borders of pores, but differs from the Badenian species by being larger (having a diameter of 190-197 μm) and by having a much more perfect spherical shape. Under the same name Lazarus (1992) illustrated from Antarctic area (Kerguellen Plateau, ODP Leg 120) two morphotypes: a larger morphotypes (pl. 5, figs. 11, 12) and a smaller one (pl. 2, figs. 9, 10 and pl. 5, figs. 13, 14). The larger morphotype differs ...