Leptaxinus subovatus Jeffreys 1881
Creators
Description
Leptaxinus subovatus (Jeffreys, 1881)
Fig. 7 j–l
Axinus subovatus Jeffreys, 1881 (p. 704, pl. 61, fig. 8).
Axinulus subovatus (Jeffreys, 1881) — Nordsieck 1969 (p. 80, pl. 13, fig. 48.13).
Leptaxinus (L.) subovatus (Jeffreys) — Di Geronimo 1974 (p. 156, pl. 3, fig. 2).
Thyasira (Parathyasira) subovata subovata (Jeffreys, 1881) — Payne & Allen 1991 (p. 513, figs. 48–50, 53 a–b). Thyasira (Parathyasira) subovata minuta Payne & Allen 1991 (p. 515, figs. 51–52, 53 c–d). Thyasira (Parathyasira) subovata (Jeffreys, 1881) — Giribet & Peñas 1997 (fig. 100). Thyasira subovata Jeffreys, 1881 — Oliver et al. 2002 (p. 60, pl. 25, figs. A–B).
Leptaxinus subovatus (Jeffreys, 1881) — Repetto et al. 2005 (p. 310, bottom right fig.).
Diagnostic characters. Oval, oblique shell; long anterior side; roundly angular posterior side; outer surface with uneven and rather coarse growth markings; right valve hinge with 1 cardinal tubercle and 2 lamellar lateral teeth; left valve hinge with 1 cardinal tubercle. Prodissoconch: shell type ST-2D; length about 120 µm; roundish Dshaped outline; low convex profile; surface smooth; P-2 absent; transition to the nepioconch poorly marked.
Remarks. The specimens at hand appear to be more similar to the subspecies minuta Payne & Allen, 1991, than to the nominal species of Jeffreys, in having an oval (not subtriangular) shell with rounded (not wedgeshaped) posterior angulation. We follow Oliver & Levin (2006) in preferring the genus Leptaxinus Verrill & Bush, 1898 for the present taxon, rather than Thyasira Lamarck, 1818, for the presence of both cardinal tubercles and lateral teeth.
Occurrence. Box-corer samples BC10 (2 specimens), BC66 (2), BC67 (3), BC72 (5); cores BC21 (1), BC72 (5). Maximum length: 2.5 mm.
Distribution and habitat. Leptaxinus subovatus is distributed troughout the Atlantic, from Iceland and Faroes to Cape Verde, Angola and Argentina, and in the Mediterranean; it is found in the 200–4000 m bathymetric interval, reaching shallower depths at arctic latitudes (Payne & Allen 1991; Poppe & Goto 1993; Di Geronimo et al. 2001; Sneli 2005).
Fossil record. Pliocene of northern Italy (Tabanelli 2008).
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Thyasiridae
- Genus
- Leptaxinus
- Kingdom
- Animalia
- Order
- Lucinoida
- Phylum
- Mollusca
- Scientific name authorship
- Jeffreys
- Species
- subovatus
- Taxon rank
- species
- Taxonomic concept label
- Leptaxinus subovatus Jeffreys, 1881 sec. Negri & Corselli, 2016
References
- Jeffreys, J. G. (1881) On the Mollusca procured during the ' Lightning' and ' Porcupine' Expeditions, 1868 - 70. Part III. Proceedings of the Scientific Meetings of the Zoological Society of London, 49 (3), 693 - 724. http: // dx. doi. org / 10.1111 / j. 1096 - 3642.1881. tb 01327. x
- Nordsieck, F. (1969) Die europaischen Meeresmuscheln (Bivalvia) vom Eismeer bis Kapverden, Mittelmeer und Schwarzes Meer. Gustav Fischer Verlag, Stuttgart, XIII + 256 pp.
- Di Geronimo, I. (1974) Molluschi bentonici in sedimenti recenti batiali e abissali dello Jonio. Conchiglie, 10 (7 - 8), 133 - 172.
- Payne, C. M. & Allen, J. A. (1991) The morphology of deep-sea Thyasiridae (Mollusca: Bivalvia) from the Atlantic Ocean. Philosophical Transactions of the Royal Society of London, B, 334, 481 - 562. http: // dx. doi. org / 10.1098 / rstb. 1991.0128
- Giribet, G. & Penas, A. (1997) Fauna malacologica del litoral del Garraf (NE de la Peninsula Iberica). Iberus, 15 (1), 41 - 93.
- Oliver, P. G., Killeen, I. J. & Ockelmann, K. W. (2002) The Thyasiridae (Mollusca: Bivalvia) of the British continental shelf and North Sea oilfields. An identification manual. Studies in Marine Biodiversity and Systematics from the National Museum of Wales. BIOMOR Reports, 3, 1 - 73.
- Repetto, G., Orlando, F. & Arduino, G. (2005) Conchiglie del Mediterraneo: 1770 specie illustrate con distribuzione e frequenza. Amici del Museo " Federico Eusebio ", Alba, 392 pp.
- Oliver, P. G. & Levin, L. (2006) A new species of the family Thyasiridae (Mollusca: Bivalvia) from the oxygen minimum zone of the Pakistan margin. Journal of the Marine Biological Association of the United Kingdom, 86, 411 - 416. http: // dx. doi. org / 10.1017 / s 0025315406013270
- Verrill, A. E. & Bush, K. J. (1898) Revision of the deep-water Mollusca of the Atlantic coast of North America, with descriptions of new genera and species. Part I. - Bivalvia. Proceedings U. S. National Museum, 20 (1139), 775 - 901. http: // dx. doi. org / 10.5479 / si. 00963801.20 - 1139.775
- Poppe, G. T. & Goto, Y. (1993) European Seashells. Volume II. (Scaphopoda, Bivalvia, Cephalopoda). Verlag Christa Hemmen, Wiesbaden, 221 pp.
- Di Geronimo, I., Rosso, A., La Perna, R. & Sanfilippo, R. (2001) Deep-sea (250 - 1,550 m) Benthic Thanatocoenoses from Southern Thyrrenian Sea. In: Faranda, F. M., Guglielmo, L., Spezie, G. (Eds), Mediterranean Ecosystems - Structures and Processes, Springer, Milano, pp. 277 - 288. http: // dx. doi. org / 10.1007 / 978 - 88 - 470 - 2105 - 1 _ 36
- Sneli, J. - A. (2005) Amphi-Atlantic distribution of marine Mollusca based on the results of the BIOFAR investigations. BIOFAR Proceedings, 2005, 88 - 93.
- 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.