Early Frasnian acanthodians from Central Iran

• Autorzy: Hairapetian V. , Valiukevicius J. , Burrow C.J.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

Acanthodii; Central Iran; Climatiidae; dental element; Diplacanthidae; Early Frasnian; Frasnian; Iran; Ischnacanthiformes; acanthodian; paleontology; histology; Devonian; systematics

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2006
• Tom: 51
• Numer: 3
• Opis fizyczny: p.499-520,fig.,ref.

Twórcy

autor

Hairapetian V.

• Department of Geology, Faculty of Sciences, Esfahan University, 81746, Esfahan, Iran

autor

Valiukevicius J.

autor

Burrow C.J.

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