Rhyncholampas, AGASSIZ, 1869

Souto, Camilla, Mooi, Rich, Martins, Luciana, Menegola, Carla & Marshall, Charles R., 2019, Homoplasy and extinction: the phylogeny of cassidulid echinoids (Echinodermata), Zoological Journal of the Linnean Society 187, pp. 622-660 : 651

GENUS RHYNCHOLAMPAS AGASSIZ, 1869

Emended diagnosis: Small to large cassidulids of varying test shape. Anterior paired petals tulip- or leaf-shaped; posterior petals bowed. Paired petals with unequal number of pores in a and b columns (difference up to four pore-pairs in anterior paired petals, up to ten pore-pairs in posterior paired petals). Poriferous zones with three or more reduced primary tubercles. Periproct transverse, with prominent aboral hood. Posterior region of test sometimes truncated. Six to ten interambulacral plates between basicoronal plate 5 and base of periproct. Interambulacrum 5 naked zone usually wide, finely pitted, although pits vary from absent to large. Bourrelets bulged or pointed; bourrelet 5 often convex, projecting towards peristome. Outer column of anterior phyllodes with five to 12 phyllopores per half; posterior phyllodes with eight 12 phyllopores per half; occluded plates often scattered. Phyllopores in large specimens often disorganized throughout phyllodes. Sphaeridia concealed by thin layer of stereom (fossils could have lost pit covering or pits in some species possibly open).

Included species based on present analysis: Rl. pacifica (type species), Rl.alabamensis , Rl. ayresi , Rl.chipolana , Rl. ericsoni , Rl. evergladensis , Rl. falconensis comb. nov., Rl. fontis , Rl. globosa , Rl. gouldii , Rl. mexicana , Rl. riveroi , Rl. rodriguezi , Rl. sabistonensis , Rl. smithi and Rl. trojana comb. nov.