Genus Trichorhina Budde-Lund, 1908 Type species Bathytropa thermophila Dollfus, 1896 = Trichorhina tomentosa (Budde-Lund, 1893) Key to the Trichorhina species from the Ibero-Balearic region. 1. Granular dorsal integument............................................................................. 2 1’. Smooth dorsal integument.............................................................................. 3 2. Trapezoidal telson................................................................ T. hispana (Dollfus, 1893) 2’. Triangular telson............................................................ Trichorhina cascaisensis sp. nov. 3. Pleon retracted in relation to pereon, small neopleura........................................................ 4 3’. Pleon not retracted in relation to pereon, large neopleura...................................................... 5 4. Fifth antennal segment thickened............................................... T. anophthalma Arcangeli, 1935 4’. Fifth antennal segment not thickened............................................ T. buchnerorum (Verhoeff, 1942) 5. Ocular apparatus formed of multiple ommatidia........................................ T. silvestrii Arcangeli, 1936 5’. Without ocular apparatus............................................................................... 6 6. Scale-setae along longitudinal lines......................................................... T. ornata sp. nov. 6’. Scale-setae along irregular transverse lines................................................. T. solorzanoi sp. nov.

Published as part of Cifuentes, Julio, Bernabé, Iván Escarabajal- & Da Silva, Luís P., 2025, The genus Trichorhina Budde-Lund, 1908 (Crustacea, Isopoda, Platyarthridae) in the Ibero-Balearic region, with descriptions of three new species, pp. 341-370 in Zootaxa 5725 (3) on pages 342-368, DOI: 10.11646/zootaxa.5725.3.2, http://zenodo.org/record/17869158