The Echinoid Directory

• Test small, semiglobular with flattened lower surface.
• Apical disc dicyclic. Gonopores marginal; ring of tubercles on inner part of genital plates surrounding periproct. Periproct subcircular; small suranal plate distinct.
• Ambulacra about half interambulacral width. Plating trigeminate, plate compounding in echinid style. Pore-pairs more or less uniserial throughout, not expanded adorally. Each compound plate with a primary tubercle, close to the pore zone. Perradial zone more or less naked.
• Interambulacral plates relatively tall with small central primary tubercle. A few scattered miliries and granules surround the primary, but the interradial zone is more or less naked adapically.
• Primary tubercles imperforate and distinctly crenulate.
• Small sutural pits at all triple junctions and along horizontal sutures, largest immediately beneath the primary tubercles.
• Peristome small, flush with shallow buccal notches. peristomial membrane naked except for buccal plates.
• Spines short and simple.
• Lantern camarodont.

Pliocene to Recent, Indo-West Pacific.

Printechinus impressus Koehler, 1927, p. 97, by monotypy.

• P. impressus Koehler, 1927; Recent, Andaman Sea
• P. javanus Lambert & Jeannet, 1935; Pliocene, Java.
• P. viridis Mortensen, 1942; Recent, Sumatra.

Euechinoidea; Camarodonta; Temnopleuroida; Temnopleuridae.

Treated as a subgenus of Microcyphus.

Distinguished from Microcyphus by the absence of biserial pore zones and the presnece of a distinct primary tubercle. Printechinus differs from Salmacopsis in having vertically elongate sutural pits.

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