Early Frasnian acanthodians from central Iran

Hairapetian, Vachik, Valiukevičius, Juozas and Burrow, Carole J. (2006) Early Frasnian acanthodians from central Iran. Acta Palaeontologica Polonica, 51 3: 499-520.

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Author Hairapetian, Vachik
Valiukevičius, Juozas
Burrow, Carole J.
Title Early Frasnian acanthodians from central Iran
Journal name Acta Palaeontologica Polonica   Check publisher's open access policy
ISSN 0567-7920
Publication date 2006
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 51
Issue 3
Start page 499
End page 520
Total pages 22
Place of publication Warsaw, Poland
Publisher Instytut Paleobiologii, Polska Akademia Nauk
Collection year 2006
Language eng
Subject C1
260112 Palaeontology
780105 Biological sciences
Formatted abstract
Two vertebrate-bearing horizons in the basal Frasnian carbonate of the Chahriseh section, northeast of Esfahan, yielded microremains of thelodonts, placoderms, acanthodians, actinopterygians, chondrichthyans, and sarcopterygians, considerably expanding the vertebrate faunal list for the strata. Acanthodians comprise a diverse association of climatiids, diplacanthids, and ischnacanthiforms, including the previously recorded climatiid Nostolepis sp. cf. N. gaujensis, as well as one new climatiid genus and several taxa left in open nomenclature. Climatiid Iranolepis ginteri gen. et sp. nov. is diagnosed by having scales with a highly raised medial crown area separated by steep slopes from lateral crown areas; an odontocytic mesodentine of maximum extent in the crown, distinguished by extensive network of fine canaliculi with abundant tiny osteocytes; and a poorly developed stranggewebe system. Other scales with fan-like symmetrically grooved crowns conform to the Diplacanthus-type histologically, and have many characters in common with Milesacanthus antarctica from the Aztec Siltstone of Antarctica. Osseous gnathal elements include mesodentinous tooth whorls from an ischnacanthiform or climatiid, and ischnacanthiform jaw bones with large chambers for vascular canals, distinctly separated cylindrical tooth cusps along the lingual ridge, and wide-based, triangular, weakly striated cusps on the main lateral ridge. The acanthodian association, accompanied by the Frasnian conodonts of the middle Mesotaxis falsiovalis to Palmatolepis hassi zones and zonal thelodonts Turinia hutkensis and Australolepis seddoni, is proving useful for biostratigraphy, showing similarities with assemblages from both Gondwana and the Old Red Sandstone Continent.
Keyword Acanthodii
Dental Elements
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2007 Higher Education Research Data Collection
School of Biological Sciences Publications
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Created: Wed, 15 Aug 2007, 08:39:41 EST