Buchia

Buchia crassicollis, copyright Erica Clites.

Belongs within: Bivalvia.

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 1845 SY85
    |--B. bulloides K79
    |--B. crassicollis K79
    |--B. donganensis Sha & Yuan 1985 SY85
    |--B. fischeriana (d’Orbigny 1888) [=Aucella fischeriana, A. fischeri] SY85
    |--B. inflata K79
    |    |--B. i. inflata K79
    |    `--B. i. crassa K79
    |--B. keyserlingi K79
    |--B. lahuseni [=Aucella lahuseni] SY85
    |--B. mosquensis H79
    |--B. obliqua SY85
    |--B. okensis (see below for synonymy) SY85
    |--B. orbicularis SY85
    |--B. pacifica K79
    |--B. poichii SY85
    |--B. subinflata SY85
    |--B. subokensis [=Aucella subokensis, B. okensis var. subokensis] SY85
    |--B. subunchensis Sha & Yuan 1985 SY85
    |--B. talmatschowi K79
    |--B. terebratuloides SY85
    |--B. trigonoides (Lahusen 1888) [=Aucella trigonoides] SY85
    |--B. uncitoides SY85
    |--B. unschensis SY85
    `--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

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.

[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.