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Echinoidea source details
Vaziri, M. R. & Arab, A. L. 2013. Echinoids of the Genus Tetragramma Agassiz (Phymosomatoida) from the Aptian Sediments of the Basab Region, Northwest of Kerman, Iran. Journal of Sciences, Islamic Republic of Iran 24, 149-155.
168915
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The echinoid fauna of Basab area (Aptian), northwest of Kerman, is fairly rich and diverse, represented by Pygaulidae, Acropeltidae, Emiratiidae, Toxasteridae, Holectypidae, Stomechinidae and Saleniidae. Four regular echinoid species, among which three are new, assigned to genus Tetragramma Agassiz, are described and illustrated in the present paper. The new species are Tetragramma basabensis, T. depressum and T. tetratuberculatus. The diagnostic features of the species are chiefly the number of interambulacral tubercles on ambital plates, the size of apical disc and peristome, and also horizontal and vertical outlines of the test. The Tetragramma specimens occur in association with a rich orbitolinid fauna and macro-invertebrates consisting of bivalves, brachiopods, corals and gastropods. Associated micro-macro fauna suggest an Aptian age for the sediments.
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Tetragramma basabensis Vaziri & Arab, 2013 † (original description (unavailable nomenclaturally))
Tetragramma depressum Vaziri & Arab, 2013 † (original description (unavailable nomenclaturally)) Tetragramma tetratuberculatus Vaziri & Arab, 2013 † (original description (unavailable nomenclaturally))
Iran for Tetragramma basabensis Vaziri & Arab, 2013 †
Iran for Tetragramma depressum Vaziri & Arab, 2013 † Iran for Tetragramma tetratuberculatus Vaziri & Arab, 2013 † Distribution Basab area, north-west of Kerman City, Iran [details] Distribution Basab area, north-west of Kerman City, Iran [details] Distribution Basab area, north-west of Kerman City, Iran [details] Etymology Refers to its type region (Basab area). [details] Etymology Refers to its four interambulacral tubercles on ambital plates. [details] Original description Test highly inflated, weakly subpentagonal in outline and ranges in size from 38.5 to 39.3 mm in diameter and 15.1 ... [details] Original description Horizontal outline subcircular, discshaped, 40.2 mm in diameter and 12.9 mm in height. Upper surface low arched, ... [details] Original description Horizontal outline circular, 33.1 mm in diameter and 14.1 mm in height. Test relatively inflated in profile, upper ... [details] Type material no type designated; 4 specimens mentioned, figured one is KUIC 12039 [details] Type material no type designated; 3 specimens mentioned, figured one is KUIC 12034 [details] Type material no type designated; 2 specimens mentioned, figured one is KUIC 1420 [details] Type material no type designated; one specimen mentioned (KUIC 1428). [details] Type material no type designated; one specimen mentioned (KUIC 1432). [details] |