The Echinoid Directory

• Test large and discoidal, with sharp margin.
• Internal supports well developed as dense honeycomb meshwork around periphery.
• Apical disc central with four gonopores.
• Elongate lunules present in all five ambulacra.
• Interambulacral zones all disjunct adorally; separated by enlarged first post-basicoronal ambulacral plates.
• Basicoronal circlet small and pentastellate; interambulacral elements projecting.
• Periproct oral; opening bounded by first pair of post-basicoronal interambulacral plates; situated midway between the peristome and the margin.
• Food grooves bifurcate at edge of basicoronal plate; finer distal branches well developed.
• Ambulacra a little narrower than interambulacra at ambitus.

Late Oligocene to Recent, Japan and south China coast south to Cambodia.

Astriclypeus mannii Verrill, 1867, p. 311 by monotypy.

• Astriclypeus mannii Verrill, 1867; Miocene to Recent, Japan, Taiwan China coast to Cambodia.
• A. integer Yoshiwara, 1903; Miocene to Pliocene, Taiwan and Japan.
• A. waiwulunensis Wang, 1983; Upper Oligocene, Taiwan.

Clypeasteroida; Scutellina; Scutelliformes; Scutellidea; Astriclypeidae.

Monophyletic.

Easily distinguished by its five ambulacral lunules and lack of an anal lunule.

Shigei, M. 1986. The echinoids of Sagami Bay Maruzen Co, Tokyo.

Nisiyama, S. 1968. The echinoid fauna from Japan and adjacent regions, Part II. Palaeontological Society of Japan, Special Paper 13, 1-491, pls 19-30.

Verrill, AE., 1867. Notes on the Radiata in the Museum of Yale College, with descriptions of new genera and species. No. 2. Notes on the Echinoderms of Panama and the West Coast of America with descriptions of new genera and species.Transactions Connecticut Academy Arts & Sciences, 1(2), 251-322.

Wang, C.C. 1983. A new species of Astriclypeus from the Wuchihshan Formation near Chilung, Taiwan. Bulletin of the Central Geological Survey of Taiwan 2, 113-120.