Orbiculoidea winsnesi Gobbett 1963
Orbiculoidea winsnesi Gobbet, 1963 (Fig. 2A) 1963 Orbiculoidea winsnesi Gobbett: 46, pl. 1, figs 4, 5. Material. One dorsal valve from LD-04 (NHMUK PI BE 3238). Description. Shell outline is subcircular, with its length slightly greater than the width. The dorsal valve is inflated to an apex, which...
| Main Authors: | , , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
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Zenodo
2016
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| Online Access: | https://doi.org/10.5281/zenodo.10883072 http://treatment.plazi.org/id/C53B0B4D8054E82F6C1FFACA894C22DF |
| Summary: | Orbiculoidea winsnesi Gobbet, 1963 (Fig. 2A) 1963 Orbiculoidea winsnesi Gobbett: 46, pl. 1, figs 4, 5. Material. One dorsal valve from LD-04 (NHMUK PI BE 3238). Description. Shell outline is subcircular, with its length slightly greater than the width. The dorsal valve is inflated to an apex, which is located about a third of the diameter from the anterior margin. Shell smooth, except for fine concentric growth lines. Remarks. Extant solitary discinids are sessile, epifaunal invertebrates that attach to hard surfaces with a suckerlike pedicle (Mergl 2010). They have been attaching to shelled invertebrates since the Ordovician (Mergl 2010), and one of the specimens described herein is attached to an ammonoid. Discinids are suspension feeders, and their co-occurrence with lingulids in laminated black shales has led some authors to interpret them as being tolerant of low-oxygen conditions (Savoy 1992; Hallam 1995; Mergl 2010). Mode of life. Surficial, stationary, attached, suspension feeder (Mergl 2010). Published as part of Foster, William J., Danise, Silvia & Twitchett, Richard J., 2017, A silicified Early Triassic marine assemblage from Svalbard, pp. 851-877 in Journal of Systematic Palaeontology 15 (10) on page 854, DOI:10.1080/14772019.2016.1245680, http://zenodo.org/record/10883052 |
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