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The Classification of the Acidaspidae

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
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Extract

Since Dr. J. M. Clarke's1 attempt in 1890 to subdivide the Acidaspidae (= Odontopleuridae) by means of the characters of the occipital ring and its spines, several other methods of classification of the members of this family have been proposed. Van Ingen,2 in 1901, adopted Clarke's names for the subgenera which he raised to the rank of genera, but he slightly modified their definitions and preferred to use the name Acidaspidae for the family, as is general in Europe, dividing it into four main groups comprising six genera. Raymond,3 in 1916, was led to criticize Clarke's principle of classification, pointing out the unnatural association of species which resulted from its application, and he accordingly desired to alter the definitions of the genera as given in 1913 in the second edition of Zittel-Eastman's “Textbook of Palaeontology ” (vol. i, p. 722). Special attention was paid to the characters of the pleurae, as in Barrande's old scheme.

Type
Original Articles
Information
Geological Magazine , Volume 62 , Issue 9 , September 1925 , pp. 416 - 430
Copyright
Copyright © Cambridge University Press 1925

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References

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page 417 note 2 The form figured by Wigand, (Zeitschr. deut. geol. Gesell., xl, 1888, p. 99, t. x, figs. 21, 22) as A. cf. ovata Emmr. does not seem to belong to this subgenus at all, but his A. mutica Emmr. is a good example of it. It seems that A. tuberculata Conr. (Hall, Palaeont., New York, vol. iii, 1861, p. 368, pi. lxxix, figs. 1–14) is a rather peculiar representative of it. Beecher has described the larval form of this species (Amer. Journ. Sc. Ser. 3., vol. xlvi, 1893, p. 144, pi. ii, figs. 1–7).Google Scholar

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page 419 note 2 Ibid., p. 739, pi. xxxix, figs. 33–41.

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page 422 note 4 Ibid., p. 726, pl. xxxix, figs. 29–32.

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page 424 note 3 Ibid., p. 116, pl. xvi, figs. 4, 5.

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page 426 note 5 Ibid., p. 707, pl.

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