The Echinoid Directory

Goniosigma Fell, 1964, p. 201

Diagnostic Features	Test low domal. Apical disc unknown. Ambulacra about half the width of the interambulacra; plating trigeminate. Pore-pairs obviously offset in arcs of three forming an adradial band. Each plate with a prominent adradial primary tubercle; wide perradial zone with just sparse secondaries and miliaries. Interambulacral plates much wider than tall. A distinct central primary tubercle with two smaller flanking secondaries on either side on ambital plates. Smaller miliaries and granules scattered over remainder of plate. Strong epistromal ornament of ridges, forming rather distinct zig-zag pattern (parallel to plaste sutures) interradially. Peristome unknown. Spines and lantern unknown.
Distribution	Oligocene, New Zealand.
Name gender	neuter
Type	Echinus enysi Hutton, 1873, p. ** by original designation.
Species Included	Only the type species.
Classification and/or Status	Euechinoidea; Camarodonta; Temnopleuroida; Trigonocidaridae. Monotypic.
Remarks	Philip (1969) suggested that Goniosigma enysi belonged to Grammechinus. However, Grammechinus is a toxopneustid and lacks sculpting. Fell, H. B. 1964. Oligocene echinoids from the Trelissic Basin, New Zealand. Transactions of the Royal Society, New Zealand 4(15), 201-205, pls 1-4. Philip, G. M. 1969. The Tertiary echinoids of South-Eastern Australia IV. Camarodonta (2). Royal Society of Victoria Proceedings 82, 233-275, pls 3-16.