The Echinoid Directory

• Apical disc large in proportion to test; hardly raised above the corona.
• Periproct offset to posterior right from anterior-posterior axis; larger than suranal plate.
• Plates of the apical disc with a fine, dense ornament of pustules.
• Ambulacral plating unigeminate except immediately adjacent to the peristome where the lowest two or four elements are bigeminate.
• Interambulacral tubercles imperforate and crenulate; mamelons enlarging adapically.

Danian to Recent, worldwide.

Salenocidaris varispina A. Agassiz, 1869, by original designation.

• S. minima (Agassiz & Desor, 1846) [includes Salenidia danica Ravn, 1928]; Danian of Europe.
• S. pellati (Cotteau, 1860); Eocene of south west France.
• S. hastigera A. Agassiz, 1869; Recent.
• S. miliaris A. Agassiz, 1869; Recent.
• S. brachiata Mortensen, 1931; Recent.
• S. pacifica (Doderlein, 1885); Recent.
• S. incrassata Mortensen, 1931; Recent.
• S. varispina Agassiz, 1869; Recent.

Salenioida; Saleniidae; Saleniinae.

Monophyletic.

Distinguished from Salenia by its less cap-like disc and uniserial ambulacral plating. Resembles Pleurosalenia in ambulacral structure but differs from that genus by having a low apical disc with pustular ornamentation.

Agassiz, A. 1869. Preliminary report on the Echini and starfishes dredged in deep water between Cuba and Florida reef by L. F. De Pourtalès, Assist. U.S. coast survey. Bulletin of the Museum of Comparative Zoology, Harvard College, 1 (9), 253-308.

Mortensen, T. (1935). A Monograph of the Echinoidea. II, Bothriocidaroida to Stirodonta. C. A. Reitzel, Copenhagen.

Smith, A. B. & Wright, C. W. 1990. British Cretaceous Echinoids. Part 2, Echinothurioida, Diadematoida and Stirodonta (1, Calycina). Monograph of the Palaeontographical Society 101-198, pls 33-72. (publication number 583, part of volume 143 for 1989).