Echinoidea name details
original description (unavailable nomenclaturally)
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. page(s): 152-153; fig. 5A-D, 7g-i [details] Available for editors
From editor or global species database
Distribution Basab area, north-west of Kerman City, Iran [details]
Etymology Refers to its four interambulacral tubercles on ambital plates. [details]
Original description Horizontal outline circular, 33.1 mm in diameter and 14.1 mm in height. Test relatively inflated in profile, upper surface low arched, margin rounded, lower surface nearly flat. The apical disc is known only by its scar. Primary tubercles perforate, crenulate, two vertical rows in each ambulacrum. At the ambitus, ambulacra are 7.5% of the test diameter. They are relatively narrow and straight. Interambulacral plates are long and narrow. There are four equal primary tubercles on each ambital and adoral plate of the interambulacra. The pore pairs are biserial on both adapical and adoral surface, whereas uniserial at the ambitus. In profile, the ambitus lies at mid-height. The peristome is large and circular in outline and occupies about one third of the test diameter. [details]
Type material no type designated; one specimen mentioned (KUIC 1432). [details]
From editor or global species database
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