Buchia

Buchia crassicollis, copyright Erica Clites.

Belongs within: Pectinida.

Buchia is a genus of mussel-like bivalves known from the Middle Jurassic to the Lower Cretaceous (Cox et al. 1969).

Characters (from Cox et al. 1969): Strongly prosocline, height well exceeding length; highly inequivalve, left valve strongly convex with more or less prominently projecting umbo and prosogyrous beak, right valve flat to feebly convex with its umbo scarcely projecting; right anterior auricle concave tonguelike process which is not in alignment with hinge margin but extends toward left valve and rests in socket in its cardinal area in front of beak; cardinal area an inequilateral triangle of moderate breadth in each valve, with shallow ligamental pit directed backward from beak, pit of left valve with raised margins; ornament of concentric ridges or ribs, occasionally with subordinate radial threads.

<==Buchia Rouillier 1845SY85
    |--B. bulloidesK79
    |--B. crassicollis (Keyserling 1846)SB93
    |--B. donganensis Sha & Yuan 1985SY85
    |--B. fischeriana (d’Orbigny 1888) [=Aucella fischeriana, A. fischeri]SY85
    |--B. inflataK79
    |    |--B. i. inflataK79
    |    `--B. i. crassaK79
    |--B. keyserlingiK79
    |--B. lahuseni [=Aucella lahuseni]SY85
    |--B. mosquensisH79
    |--B. obliquaSY85
    |--B. okensis (see below for synonymy)SY85
    |--B. orbicularisSY85
    |--B. pacificaK79
    |--B. poichiiSY85
    |--B. subinflataSY85
    |--B. subokensis [=Aucella subokensis, B. okensis var. subokensis]SY85
    |--B. subunchensis Sha & Yuan 1985SY85
    |--B. talmatschowiK79
    |--B. terebratuloidesSY85
    |--B. trigonoides (Lahusen 1888) [=Aucella trigonoides]SY85
    |--B. uncitoidesSY85
    |--B. unschensisSY85
    `--B. volgensis (Lahusen 1888) (see below for synonymy)SY85

Buchia okensis [=Aucella okensis; incl. A. canadiana Crickmay 1930, Buchia okensis var. canadiana, A. cascadensis Crickmay 1930]SY85

Buchia volgensis (Lahusen 1888) [=Aucella volgensis; incl. A. occidentalis Anderson 1945, Buchia occidentalis, A. volgensis var. radiolata Pavlow 1896]SY85

*Type species of generic name indicated

References

[H79] Hölder, H. 1979. Jurassic. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A390–A417. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[K79] Kauffman, E. G. 1979. Cretaceous. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A418–A487. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[SY85] Sha J.-G. & Yuan F.-S. 1985. Buchia fauna from Dong’anzhen Formation near Dong’an of Raohe County, Heilongjiang. Acta Palaeontologica Sinica 24 (6): 651–662.

[SB93] Skelton, P. W., & M. J. Benton. 1993. Mollusca: Rostroconchia, Scaphopoda and Bivalvia. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 237–263. Chapman & Hall: London.

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