Eurhodia, D' ARCHIAC & HAIME, 1853

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 : 652

GENUS EURHODIA D’ ARCHIAC & HAIME, 1853

Emended diagnosis: Small to medium-sized eurhodiids with rounded to elongate test, usually with concave oral region, although a few species have only depressed midline. Anterior paired petals tulip- or leaf-shaped; posterior petals bowed and often largest. Poriferous zone with reduced or normal primary tubercles. Outer columns of pore-pairs in posterior petals sometimes wider than inner columns. Periproct supramarginal, transverse, with subanal shelf. Posterior region of test sometimes truncated. Five to nine interambulacral plates between basicoronal plate 5 and base of periproct. Naked zone usually deeply pitted. Peristome longitudinal, pentagonal (except for Eu. relicta , which has oval peristome). Bourrelets pointed, bourrelet 5 reduced. Anterior paired phyllodes with five to 13 phyllopores per half; occluded plates always present, sometimes forming inner column. Sphaeridial pits may be placed near buccal pores or throughout phyllodes, along inner column of pores.

Included species based on present analysis: Eu. morrisi (type species), Eu. baumi , Eu. calderi , Eu. cravenensis , Eu. elliptica comb. nov., Eu. holmesi , Eu. matleyi , Eu. navillei , Eu. patelliformis , Eu. relicta , Eu. rugosa and Eu. thebensis .