Nemocardium

Nemocardium bechei, copyright James St. John.

Belongs within: Cardiidae.

Nemocardium is a genus of cockles with shells bearing a radial sculpture of narrow ribs, usually no wider than they are high, with the posterior ribs more prominent than those elsewhere on the shell, at least early in ontogeny (Schneider 2002).

<==Nemocardium
    |  i. s.: N. alatum (Suter 1917) [=Protocardia alata] F27
    |         N. centifilosum S59
    |         N. patulum (Hutton 1873) [=Cardium patulum, Protocardia patula; incl. P. sera Hutton 1873] F27
    |         N. semitectum Marwick 1926 F27
    |--N. (Nemocardium) S02
    |    |--*N. (N.) semiasperum [=Cardium semiasperum] F27
    |    `--N. (N.) bechei (Reeve 1847) S02
    `--N. (Pratulum Iredale 1924) P61
         |--N. (*P.) thetidis (Hedley 1902) P61, MG-H11 [=Cardium striatulum thetidis F27]
         |--‘Pratulum’ hemimeris (Tate 1887) [=Cardium hemimeris] DK08
         `--N. (P.) pulchellum (Gray 1843) P61 (see below for synonymy)

Nemocardium (Pratulum) pulchellum (Gray 1843) P61 [=Cardium pulchellum F27, Protocardia pulchella F27; incl. C. striatulum F27]

*Type species of generic name indicated

REFERENCES

[DK08] Darragh, T. A., & G. W. Kendrick. 2008. Silicified Eocene molluscs from the Lower Murchison district, Southern Carnarvon Basin, Western Australia. Records of the Western Australian Museum 24 (3): 217–246.

[F27] Finlay, H. J. 1927. A further commentary on New Zealand molluscan systematics. Transactions and Proceedings of the New Zealand Institute 57: 320–485.

[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.

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

[S02] Schneider, J. A. 2002. Phylogeny of cardiid bivalves (cockles and giant clams): revision of the Cardiinae and the importance of fossils in explaining disjunct biogeographical distributions. Zoological Journal of the Linnean Society 136: 321–369.

[S59] Stohler, R. 1959. Range extensions of some west N. A. marines. Nautilus 72 (4): 127–130.