Acanthoniscus, Gosse, 1851

Rodríguez-Cabrera, Tomás M. & de Armas, Luis F., 2023, Taxonomy of the enigmatic genus Acanthoniscus Gosse, 1851 (Isopoda: Oniscidea: Armadillidae), from Jamaica, with the description of a new species, Nauplius (e 2023006) 31, pp. 1-25 : 21

Finally, both species of Acanthoniscus can be easily identified using the following key:

1. Cephalothorax with upper margin of frontal shield forming angulate lateral lobes and a small, triangular median lobe, dorsal surface with two small posteromedian spiniform tubercles; dorsal surface of pereon tergites with only a pair of small posteromedian spiniform tubercles between larger spines, no paramedian spiniform tubercles present; uropod sympodite “subtriangular,” with a slightly convex outer margin, medial-posterior angle not reaching distal margin of pleotelson; uropod endopodite long, widely surpassing distal margin of sympodite; pleotelson ending in two prominent triangular projections separated by a deep notch ..................................................................... A. spiniger

-. Cephalothorax with upper margin of frontal shield forming rounded lateral lobes and a well-developed, deeply notched frontal lobe (forming two triangular projections), dorsal surface with a pair of small paramedian spiniform tubercles and three medium-sized, club-like posteromedian spines; dorsal surface of pereon tergites with three medium-sized posteromedian spines, and one (pereonites 2–7) or two (pereonite 1) pairs of paramedian spiniform tubercles; uropod sympodite “subtrapezoidal,” outer margin widely convex and produced (forming an almost square angle), medial-posterior angle approximately at same level or slightly surpassing distal margin of pleotelson; uropod endopodite short, not reaching distal margin of sympodite; pleotelson ending in two small triangular projections separated by a shallow notch .................... A. richardsonae sp. nov.