The Echinoid Directory

Hybochinus Worthen & Miller, 1883, p. 331

Diagnostic Features	Test shape globular; plating strongly imbricate. Apical disc unknown. Ambulacra straight and multiserial; multiple aligned rows and columns of small hexagonal plates, up to ?8 columns. Ambulacral plates imbricating orally, each with a small pore-pair. No tubercles. Interambulacral zones narrower than ambulacral zones; composed of 3-4 strongly imbricate columns of rhomboidal plates. Interambulacral plates with fine granulation only. Lantern present, structure unknown.
Distribution	Lower Carboniferous, USA.
Name gender	masculine
Type	Hybochinus spectabilis Worthen & Miller 1883, p. 331, by original designation.
Species Included	Only the type species.
Classification and/or Status	Stem group Echinoidea; Lepidesthidae. Monotypic; subjective junior synonym of Lepidesthes Meek & Worthen,1868.
Remarks	Similar in all details to Lepidesthes. Jackson, R. T. 1912. Phylogeny of the Echini, with a revision of Palaeozoic species Memoirs of the Boston Society of Natural History 7, 491 pp. 76 pls. Worthen, A. H. & Miller, S. A. 1883 Geological Survey of Illinois 7, p. 331.