Pecten

Great scallop Pecten maximus, copyright Steve Trewhella.


Belongs within: Pectinoidea.

Pecten is a genus of scallops that is first known from the Upper Eocene. The valves of the shell are distinctly unequal, with the right valve being strongly convex and the left valve only slightly convex, flat or concave. Pecten species are free-living on the surface of the substrate. Some members of the genus grow relatively large and are commercially significant.

Finlay (1927) separated the New Zealand species Pecten novaezelandiae as the type of a new genus Notovola on the basis of it having a more inflated right valve with higher and flatter ribs than Pecten maximus, together with weaker cardinal teeth. This generic distinction is not generally accepted by recent authors.

Characters (from Cox et al. 1969): Radial ribs well developed and on right valve usually wider than interspaces, radially striate, grooved, or nearly smooth; hinge with cardinal crura extending from each side of ligamental pit.

<==Pecten Müller 1776 RC78 [incl. Notovola Finlay 1927 P61]
    |--*P. maximus [=Ostrea maxima] P61
    |--P. aduncus O75
    |--P. burnetti A27
    |--P. chathamensis A27
    |--P. comptus M’Coy 1844 F71
    |--P. convexus W27
    |--P. costatostriatus Marshall 1918 F27b
    |--P. deformis Gabb 1864 F27b
    |--P. delicatulus W27
    |--P. devinctus A27
    |--P. fumatus Reeve 1852 MG-H11
    |--P. giganteus Münster in Goldfuss 1833 non Lima gigantea Gray 1825 (not preoc. if in dif. gen.) RC78
    |--P. hectori Hutton 1873 F27b
    |--P. huttoni A27
    |--P. irradians TH59
    |--P. islandicus CS77
    |--P. jacobeus P75
    |--P. medius Lamarck 1819 F27a
    |--P. meridionalis F27a
    |--P. missouriensis Shumard 1855 W77
    |--P. mitis Dana 1849 F71
    |--P. novaezelandiae Reeve 1852 P61 [=*Notovola novaezelandiae F27a]
    |    |--P. n. novaezelandiae P61
    |    `--P. n. rakiura Fleming 1951 P61
    |--P. opercularis BK77
    |--P. roemeri [=Neithea roemeri] S02
    |--P. schlernica Finlay 1927 [=P. zitteli Woehrmann & Koken 1892 non Hutton 1873] F27b
    |--P. sectus Goldfuss 1836 F27b
    |--P. semiplicatus Alth in Favre 1869 F27b
    |--P. striatocostatus Goldfuss 1833 F27b
    |--P. tenuicostatus Mighels & Adams 1842 (see below for synonymy) J49
    |--P. triphooki F27a
    |--P. waihaoensis A27
    |--P. yahlensis F27b
    `--P. zitteli Hutton 1873 F27b

Pecten tenuicostatus Mighels & Adams 1842 [=P. tenuicostata Mighels & Adams 1841 (n. n.); incl. P. magellanicus Gmelin 1843] J49

*Type species of generic name indicated

REFERENCES

[A27] Allan, R. S. 1927. The geology and palaeontology of the Lower Waihao Basin, south Canterbury, New Zealand. Transactions and Proceedings of the New Zealand Institute 57: 265–309.

[BK77] Barel, C. D. N., & P. G. N. Kramers. 1977. A survey of the echinoderm associates of the north-east Atlantic area. Zoologische Verhandelingen 156: 1–159.

Cox, L. R., N. D. Newell et al. 1969. Treatise on Invertebrate Paleontology pt N. Bivalvia vol. 1. The Geological Society of America, Inc. and The University of Kansas.

[CS77] Cramp, S., & K. E. L. Simmons (eds) 1977. Handbook of the Birds of Europe, the Middle East and North Africa: The Birds of the Western Palaearctic vol. 1. Ostrich to Ducks. Oxford University Press: Oxford.

[F27a] Finlay, H. J. 1927a. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.

[F27b] Finlay, H. J. 1927b. New specific names for austral Mollusca. Transactions and Proceedings of the New Zealand Institute 57: 488–533.

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1–167.

[J49] Johnson, R. I. 1949. Jesse Wedgwood Mighels with a bibliography and a catalogue of his species. Occasional Papers on Mollusks 1 (14): 213–231.

[MG-H11] McEnnulty, F. R., K. L. Gowlett-Holmes, A. Williams, F. Althaus, J. Fromont, G. C. B. Poore, T. D. O’Hara, L. Marsh, P. Kott, S. Slack-Smith, P. Alderslade & M. V. Kitahara. 2011. The deepwater megabenthic invertebrates on the western continental margin of Australia (100–1100 m depths): composition, distribution and novelty. Records of the Western Australian Museum Supplement 80: 1–191.

[O75] Owen, R. 1875. On fossil evidences of a sirenian mammal (Eotherium aegyptiacum, Owen) from the nummulitic Eocene of the Mokattam cliffs, near Cairo. Quarterly Journal of the Geological Society of London 31: 100–105.

[P75] Por, F. D. 1975. Pleistocene pulsation and preadaptation of biotas in Mediterranean seas: consequences for Lessepsian migration. Systematic Zoology 24 (1): 72–78.

[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.

[RC78] Roth, B., & E. V. Coan. 1978. Nomenclatural notes on Hinnites giganteus (Gray). Veliger 20 (3): 297–298.

[S02] Scott, R. W. 2002. Albian caprinid rudists from Texas re-evaluated. Journal of Paleontology 76 (3): 408–423.

[TH59] Turner, H. J., Jr & J. E. Hanks. 1959. Infestation of Pecten irradians by Polydora. Nautilus 72 (4): 109–111.

[W27] Waghorn, R. J. 1927. The geology of the Ruakokopatuna Valley, southern Wairarapa. Transactions and Proceedings of the New Zealand Institute 57: 226–234.

[W77] White, C. A. 1877. Report upon the invertebrate fossils collected in portions of Nevada, Utah, Colorado, New Mexico, and Arizona, by parties of the expeditions of 1871, 1872, 1873, and 1874. U.S. Geographical Surveys West of the One Hundredth Meridian 4 (1): 1–219, pls 211–221.

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