Thyasira flexuosa Montagu 1803

• Main Authors: Negri, Mauro Pietro, Corselli, Cesare
• Format: Text
• Language: unknown
• Published: Zenodo 2016
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Bivalvia; Lucinoida; Thyasiridae; Thyasira; Thyasira flexuosa; Greenland; Pacific; Norway; Petersen; Morton; Montagu; Suo; Palermo; Eusebio; Northern Norway
• Online Access: https://dx.doi.org/10.5281/zenodo.6082177; https://zenodo.org/record/6082177

Thyasira flexuosa (Montagu, 1803) Fig. 7 d–f Tellina flexuosa Montagu, 1803 (p. 72). ? Ptychina biplicata Philippi, 1836 (p. 15, pl. 2, fig. 4). Axinus flexuosus Montagu—Hidalgo 1917 (p. 160). Thyasira flexuosa (Montagu) — Tebble 1966 (p. 79, text-figs. 5a–b); Di Geronimo & Panetta, 1973 (p. 103, pl. 2, fig. 13). Thyasira flexuosa flexuosa (Montagu, 1803) — Nordsieck 1969 (p. 78, pl. 13, fig. 48.00). Thyasira flexuosa (Montagu, 1803) — Barash & Danin 1992 (p. 265, fig. 284); Cossignani et al. 1992 (fig. 312); Poppe & Goto 1993 (p. 83, pl. 14, fig. 1); Petersen 2004 (p. 74, fig. 63); De Frias Martins et al. 2009 (p. 89, fig. 327). ? Thyasira biplicata (Philippi, 1836) — Giribet & Peñas 1997 (p. 86, fig. 98); Repetto et al. 2005 (p. 308, mid right fig.); Oliver et al . 2016 (online resource). Thyasira ( Thyasira ) flexuosa (Montagu, 1803) — Oliver et al. 2002 (pp. 24, 65; pl. 2, fig. A; pl. 4; pl. 6, fig. A; pls. 7–8; pl. 9, figs. C–D; pl. 10, fig. B; pl. 13, figs. A–B, H; text-fig. 6); Oliver et al . 2016 (online resource). Diagnostic characters . Pentagonal shell; two shallow posterior radial depressions, the dorsal one shorter and narrower; typically two-folded posterior margin. Prodissoconch: shell type ST-2D; length about 170 µm; inequilateral (more expanded posteriorly), roundish D-shaped outline; convex profile; surface smooth; rim-like P-2 with few weak commarginals, barely separated from P-1; transition to the nepioconch well marked. Remarks . The relationship of T. flexuosa with T. biplicata (Philippi, 1836) is still unclear, because some authors (e.g. Nordsieck 1969; Poppe & Goto 1993) regard this latter as a junior synonym of Montagu’s species, while some others (e.g. Giribet & Peñas 1997) consider it as a valid taxon with a different distribution. Occurrence . Box-corer samples BC67 (1 specimen), BC71 (5), BC72 (18); core BC72 (6). Maximum height: 6 mm. Distribution and habitat . The species ranges from northern Norway to the Gulf of Mexico and the Azores into the Mediterranean; it is also present in the northern Pacific. The species dwells on mud and sand from the intertidal zone to below 2000 m depth, being both chemosymbiotic and suspensivore (Nordsieck 1969; Barash & Danin 1992; Poppe & Goto 1993; Oliver et al. 2016). Fossil record. Miocene to Recent (Monterosato 1872; Monegatti & Raffi 2001); Pliocene? of northern Italy (Tabanelli 2008 sub T. biplicata ); Pleistocene and Holocene of the North Sea and Denmark (Petersen 2004). : Published as part of Negri, Mauro Pietro & Corselli, Cesare, 2016, Bathyal Mollusca from the cold-water coral biotope of Santa Maria di Leuca (Apulian margin, southern Italy), pp. 1-97 in Zootaxa 4186 (1) on pages 33-34, DOI: 10.11646/zootaxa.4186.1.1, http://zenodo.org/record/165288 : {"references": ["Montagu, G. 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Keterpress Enterprises, Jerusalem, pp. 1 - 405.", "Cossignani, T., Cossignani, V., Di Nisio, A. & Passamonti, M. (1992) Atlante delle conchiglie del medio Adriatico. L'Informatore Piceno Editore, Ancona, 120 pp.", "Poppe, G. T. & Goto, Y. (1993) European Seashells. Volume II. (Scaphopoda, Bivalvia, Cephalopoda). Verlag Christa Hemmen, Wiesbaden, 221 pp.", "Petersen, K. S. (2004) Late Quaternary environmental changes recorded in the Danish marine molluscan faunas. Geological Survey of Denmark and Greenland Bulletin, 3, 1 - 268.", "De Frias Martins, A. M., Borges, J. P., Avila, S. P., Costa, A. C., Madeira, P. & Morton, B. (2009) Illustrated checklist of the infralittoral molluscs off Vila Franca do Campo. Acoreana, Supplement 6, 15 - 103.", "Giribet, G. & Penas, A. (1997) Fauna malacologica del litoral del Garraf (NE de la Peninsula Iberica). Iberus, 15 (1), 41 - 93.", "Repetto, G., Orlando, F. & Arduino, G. 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(2001) Taxonomic diversity and stratigraphic distribution of Mediterranean Pliocene bivalves. Palaeogeography, Palaeoclimatology, Palaeoecology, 165, 171 - 193. http: // dx. doi. org / 10.1016 / s 0031 - 0182 (00) 00159 - 0", "Tabanelli, C. (2008) Associazioni di paleocomunita batiali a molluschi bentonici nel Pliocene della Romagna. Quaderno di Studi e Notizie di Storia Naturale della Romagna, 26, 1 - 80."]}