Howe, H. J. (1965). Dalmanellidae from the Montoya Group (Ordovician) of trans-Pecos Texas. Journal of Paleontology. 39: 235-247, plate 36.

488645

Howe, H. J.

1965

39: 235-247, plate 36

Publication

Two new species, Diceromyonia crassa and Onniella plicata, and a new subspecies Onniella quadrata variata, are described. Diceromyonia Wang is emended to include individuals in which the diductor muscles do not completely enclose the adductor muscles. Onniella Bancroft is emended to include specimens in which the diductor muscles may completely enclose the adductor muscles. Closely related genera--Heterothina Bancroft, Diceromyonia, Onniella, and Resserella Bancroft--reveal considerable overlap in ventral musculature, making this feature a somewhat unreliable taxonomic character at the familial, generic and specific levels.

Brachiopoda

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