The Echinoid Directory

• Test depressed and low conical in profile with flat oral surface and deeply sunken peristome.
• Apical disc dicyclic or hemicyclic (ocular I may be insert), with distinct ring of tubercles on genital plates surrounding periproct. Periproct opening relatively large and circular. Suranal plate distinct in juveniles but not adults.
• Ambulacral plating trigeminate with compounding in echinid style. Pore-pairs offset forming a single broad adradial band.
• One primary tubercle to each ambulacral plate adorally;at the ambitus and subambitally these tubercles alternately offset so as to form a double column of primary tubercles. Above the ambitus primary tubercle on every second compound plate only.
• Interambulacral plates elongate with row of 3 or 4 subequal tubercles on subambital plates. Above the ambitus there is only a single primary tubercle to each plate. Aboral plates rather naked especially adapically.
• Primary tubercles imperforate and strongly crenulate.
• Distinct naked interradial zone adapically.
• Small pits at all interradial and perradial suture triple points; horizontal sutures also slightly incised adapically.
• Peristome small and deeply invaginated, with feeble buccal notches.
• Perignathic girdle strong, with well developed apophyses and auricles that are fused perradially.

Recent; Indo-West Pacific.

Salmacis dussumieri Agassiz, in Agassiz & Desor, 1846, p. 359, by original designation.

• S. dussumieri (Agassiz, in Agassiz & Desor, 1846); Recent, Indo-West Pacific.
• S. erythracis (Clark, 1912); Recent, East Africa coast.
• S. oligopora (Clark, 1916); Recent, Australia.

Euechinoidea; Camarodonta; Temnopleuroida; Temnopleuridae.

Distinguished from Salmacis by the ambulacral tuberculation and the apical disc asymmetry according to Mortensen.

Mortensen, T. 1943. A monograph of the Echinoidea Part III.2, Camarodonta 1. C. A. Reitzel, Copenhagen.