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Itagnostus interstrictus (WHITE, 1874)

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Itagnostus interstrictus (WHITE, 1874)


Here is a Agnostid Trilobite of the species Itagnostus interstrictus from the middle Cambrian of Utah. This species till 2012 known as Peronopsis interstricta.
In 2012 Elena Naimark publisched a extensive revision of 116 species of the familie of Peronopsidae. In this publication is the species P. interstricta reassigned to the the Genus Itagnostus Ípik, 1979. It is interesting that Ípik established this taxaon as a subgunus of Peronopsis. The Typespecies was Peronopsis (ltagnostus) elkedraensis (Etheridge Jr,1902).

It appears contradictory because Jell & Adrain, 2002 classify the genus Itagnostus including its type species as a junior synonym of  Peronopsis, fide Robison, 1988.

Jell, P.A. & Adrain, J.M. 30 8 2002: Available generic names for trilobites. Memoirs of the
Queensland Museum 48(2): 331-553. Brisbane. ISSN0079-8835.

Naimark, E. B. (2012). Hundred species of the genus Peronopsis Hawle et Corda, 1847. Paleontological Journal, 46(9), 945–1057.doi:10.1134/s0031030112090018

Ípik, A.A., Middle Cambrian Agnostids: Systematics and
Biostratigraphy, Canberra, 1979, pp. 5–187.

Robison 1988. Trilobites of the Holm Dal Formation (late Middle
Cambrian), central north Greenland. Meddelelser
om Gr°nland, Geoscience 20: 23-103.



Millard Co., Utah, USA 
Size trilobite:about 9 mm long
Age:Middle Cambriun, Wheeler Fm. (about 518 Mill. Y.)

15,95 EUR

7 % VAT incl.

Shipping time:3-4 Days

Product no.: 10387

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Itagnostus interstrictus (WHITE, 1874)Itagnostus interstrictus (WHITE, 1874)
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