Identification key for World Caleidoscopsis species 1. Epimeral plate 3, posteroventral angle with a tooth; urosomite 1 with 1 dorsal tooth, small or long..................... 2 - Epimeral plate 3, posteroventral angle rounded, without a tooth; urosomite 1 with 2 small dorsal teeth, not reaching half-length of the urosomite 2..................................................... Caleidoscopsis tikal (J.L. Barnard, 1967) 2. Coxa 5 subtriangular, as long as wide; epimeral plate 3, posteroventral angle with moderate tooth, not exceeding end of urosomite 1.......................................................................................... 3 - Coxa 5 subrectangular, longer than wide; epimeral plate 3, posteroventral angle with a well-developed tooth, exceeding end of urosomite 1................................................... Caleidoscopsis simplignathia (J.L. Barnard, 1962) 3. Urosomite 1 not covering urosomite 2, with 1 small dorsal tooth; urosomite 2 with 1 small dorsal tooth, not exceeding halflength of urosomite 3.................................................................................. 4 - Urosomite 1 covering part of urosomite 2, with 1 long dorsal tooth; urosomite 2 with 1 very long dorsal tooth almost reaching the end of urosomite 3....................................................... Caleidoscopsis karamani sp. nov. 4. Antennae 1–2 flagellum with short articles, as long as wide; pereopod 7, basis 1.5x longer than wide; uropod 3, outer ramus with long article 2, about 40% of total length of ramus........................................................ 5 - Antennae 1–2 flagellum with long articles, at least 2x longer than wide; pereopod 7 basis thinner, 2x longer than wide; uropod 3, outer ramus with short article 2, about 25% of total length of the ramus......... Caleidoscopsis inermis (Ledoyer, 1986) 5. Antenna 1 simple, not geniculate; maxilliped palp, article 4 longer than 3; pereopods 5–7, propodus longer than dactylus...................................................................... Caleidoscopsis copal (J.L. Barnard, 1967) - Antenna 1 geniculate, folded up; maxilliped palp article 4 shorter than 3; pereopods 5–7, propodus shorter than dactylus............................................................................... Caleidoscopsis carlosi sp. nov.

Published as part of Do Nascimento, Priscila S. & Serejo, Cristiana S., 2023, New findings of the family Pardaliscidae from the deep-sea southwestern Atlantic the genus Caleidoscopsis Karaman, 1974, pp. 139-157 in Zootaxa 5256 (2) on page 156, DOI: 10.11646/zootaxa.5256.2.3, http://zenodo.org/record/7745475