Cassidulus, LAMARCK, 1801

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 CASSIDULUS LAMARCK, 1801

Emended diagnosis: Small to medium-sized cassidulids with oval test; oral region concave. Anterior petals tulip-shaped (or rarely straight); posterior petals straight. Paired petals with unequal number of pores in a and b columns (difference up to four pore-pairs in anterior paired petals, up to six pore-pairs in posterior paired petals). Poriferous zones with sparse primary tubercles. Periproct transverse, with prominent aboral hood. Six to eight interambulacral plates between basicoronal plate 5 and base of periproct. Interambulacrum 5 naked zone wide; pits abundant, large or small. Anterior phyllodes with five to ten phyllopores per half; posterior phyllodes with four to seven phyllopores per half; occluded plates lacking. Bourrelets poorly developed or bulged. Sphaeridia concealed by thin layer of stereom (fossils could have lost pit covering or pits in some species possibly open).

I n c l u d e d s p e c i e s b a s e d o n p r e s e n t a n a l y s i s: C. caribaearum (type species), C. anceps comb. nov., C. briareus , C. californicus , C. infidus and C. mitis .