The Echinoid Directory

• Apical disc large with smooth to weakly granular plates; pitting well developed along sutures. Ocular plates not projecting.
• Periproct small and diamond-shaped; generally smaller than suranal plate.
• Ambulacral zones narrow with one primary tubercle to every two pore-pairs throughout.
• No sphaeridial pits in ambulacral zones.
• Interambulacral tubercles weakly crenulate.

Late Jurassic (Tithonian) to Early Palaeocene (Danian) of Europe and North Africa.

Hyposalenia stellulata L. Agassiz, 1838, by subsequent designation of Smith & Wright, 1990, p. 174.

• Hyposalenia valleti de Loriol in Pictet, 1868; Tithonian of France.
• H. stellulata (L. Agassiz, 1838); Valanginian and Hauterivian of France and Switzerland.
• H. favrei de Loriol
• H. lardyi Desor, 1856; Aptian of France and England.
• H. wrightii Desor, 1856; Lower and Upper Aptian of England, Switzerland and France.
• H. radians Smith & Wright, 1990; Lower Albian of England.
• H. studeri (Agassiz & Desor, 1846); Lower Albian to Middle Cenomanian of England; Late Albian of France.
• H. clathrata (Woodward, 1856); Late Albian to Early Cenomanian of England and France.
• H. phillipsae (Whitney & Kellum, 1966); Albian, Texas, USA
• H. pulchella (L. Agassiz, 1838); Cenomanian of France and England.
• H. heliophora (Agassiz & Desor, 1846); Danian of Belgium, The Netherlands, Denmark and Northern Germany.

Salenioida; Saleniidae; Hyposaleniinae.

Paraphyletic.

Distinguished from other Salenioida except Goniophorus by having the periproct symmetrically displaced to the posterior. Pseudosalenia has a similar apical disc but has perforate interambulacral tubercles. A plesiomorphic grade by exclusion of Goniophorus, which differs from Hyposalenia in having sphaeridial pits in its ambulacra.

Desor, E. 1855-1858. Synopsis des échinides fossiles, lxviii + 490 pp., 44 pls. Reinwald, Paris.

Smith , A. B. & Wright, C. W. (1990) British Cretaceous Echinoids Part 2. Palaeontographical Society Monograph no. 583 143, 101-198, pls 33-72.