Oswaldella terranovae Pena Cantero & Vervoort 1996
Oswaldella terranovae Peña Cantero & Vervoort, 1996 (Fig. 17 a–f) Material examined. ANT XV/3: 48-27, several stems, up to 110 mm high; 48-31, few colonies, up to 80 mm high, some on stone; 48-33, several colonies, up to 170 mm high, some on stone; 48-34, one colony, up to 150 mm high, on sponge...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://zenodo.org/record/5935023 https://doi.org/10.5281/zenodo.5935023 |
| Summary: | Oswaldella terranovae Peña Cantero & Vervoort, 1996 (Fig. 17 a–f) Material examined. ANT XV/3: 48-27, several stems, up to 110 mm high; 48-31, few colonies, up to 80 mm high, some on stone; 48-33, several colonies, up to 170 mm high, some on stone; 48-34, one colony, up to 150 mm high, on sponge, with developing gonothecae; 48-36, few colonies, up to 120 mm high, with gonothecae; 48-50, several stems, up to 100 mm high; 48-63, several stems, up to 170 mm high; 48-210, several stems, up to 70 mm high, on stone and gravel, with developing gonothecae; 48-276, several stems, up to 110 mm high; ANT XVII /3: 111-5, several stems, up to 130 mm high, on gravel, with gonothecae; 111-6, several stems, up to 100 mm high; 111-7, several stems, up to 120 mm high, with developing gonothecae; 111-9, few stems, up to 60 mm high, with gonothecae; 111-18, few colonies, up to 210 mm high, with gonothecae; ANT XXI /2: PS65/251, few colonies, up to 115 mm high, on gravel and stone; PS65/278, few stems, up to 130 mm high; PS65/281, few colonies, up to 110 mm high, with gonothecae. Remarks. [Note: Recently, Peña Cantero and González Molinero (2018) demonstrated that the ubiquitous Oswaldella stepanjantsae Peña Cantero, Svoboda & Vervoort, 1997 is a junior synonym of the uncommon Oswaldella terranovae Peña Cantero & Vervoort, 1996]. Among the abundant material examined, we found some small fragments with caulinar apophyses in spiral arrangement forming three longitudinal rows (Fig. 17e). In one case, a transition between triseriate and biseriate arrangement has been observed. Hitherto, triseriate apophyses are extremely rare amongst members of the family Kirchenpaueriidae (cf. Peña Cantero 2007), only documented in a single Antarctic representative of the genus Oswaldella: Oswaldella laertesi Peña Cantero, 2007, in which the triseriate disposition is constant. The fragments studied are clearly referable to O. terranovae because up to six axillary nematophores have been observed on the caulinar apophyses, and the abcauline ... |
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