True Kayserops Moroccan Trilobite Natural Double - Two Species

Kayserops megaspina and Kayserops moroccanensis

Trilobites Order Phacopida, Subfamily Asteropyginae

Geological Time: Devonian

Size: Kayserops megaspina: 85 mm long by 77 mm wide, Kayserops moroccanensis: 54 mm long by 27 mm wide on a 75 by 68 mm matrix

Fossil Site: Mount Issimour Alnif , Morocco

Description: An elegant example of a pair of members of the Order Phacopida, Subfamily Asteropyginae with many fine details present. Notice the fine eye facets present on this specimen, and the pustules present on the larger specimen. This one has been incorrectly called “Comura cometa” in the fossil trade, but is in fact Kayserops megaspina (for “big-spined”). The Asteropyginae recently have undergone revision. The trilobite called “Kayserops’ in the fossil trade is actually Metacanthina issoumourensis, a far more commonly-available member of the Asteropyginae. The smaller one is the true Kayserops, distinguished as such by the elongated pygidial spines, which resembles Metacanthina. This is a natural double, affording you an opportunity to have both examples of the genus in one plaque.

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