Two new species of the previously monospecific genus Guipuzcosoma Vicente & Mauriès, 1980 from Spain, with establishment of Guipuzcosomatidae fam. nov. (Diplopoda: Chordeumatida) Author Antić, Dragan University of Belgrade-Faculty of Biology, Institute of Zoology, Studentski Trg 16, 11000 Belgrade, Serbia & Serbian Biospeleological Society, Trg Dositeja Obradovića 2, 21000 Novi Sad, Serbia Author Mauriès, Jean-Paul 0000-0002-0575-6937 Muséum National d’Histoire Naturelle, Dpt. Origines & Evolution, Section Arthropodes, 61 rue Buffon F- 75005 Paris, France mauries. jean-paul @ wanadoo. fr; https: // orcid. org / 0000 - 0002 - 0575 - 6937 mauries.jean-paul@wanadoo.fr text Zootaxa 2022 2022-01-26 5093 2 142 168 journal article 2406 10.11646/zootaxa.5093.2.2 ffbad455-ad57-4fa5-8efa-d18cc2d12e40 1175-5326 5905141 31913C5B-A8D5-4A30-8D9E-4C7C9E953E1E Genus Guipuzcosoma Vicente & Mauriès, 1980 Guipuzcosoma Vicente & Mauriès, 1980: 10 , 12, 13, figs 7–12. Guipuzcosoma — Mauriès (1986: 251 , 252, figs 4–6). Type species : Guipuzcosoma comasi Vicente & Mauriès, 1980 , by original designation. Diagnosis . In addition to the above-mentioned combination of characters, the genus Guipuzcosoma clearly differs from all other chordeumatidan genera by very characteristic posterior gonopods whose coxotelopodites have a pair of striking distomesal horns. Short description. Medium-sized chordeumatidans, with body length 7–10 mm , and with 30 rings (including telson) in adults. Body rings with dorsolateral humps, bearing stout, long and trichoid macrochaetae ( Haasea - type ). Head with frontal side slightly concave in males, convex in females, with 12–17 ommatidia. Legs without tarsal papillae. Pregonopodal legs 3–7 not enlarged; coxa 7 with mesal bump, no other peculiarities. Leg-pair 10 in males with coxal sacks and with short triangular trochanteral bumps; leg-pair 11 in males with coxal sacks and with short nippled coxal process. Anterior gonopods: gonopodal sternum poorly developed and poorly chitinized, mainly membranous. Coxites wide in lateral view, with two pairs of angiocoxites, the second pair being twobranched with striking anterior branch composed of a few very long flagelloid processes. Colpocoxites strongly developed, massive, chitinized, only with rounded membranous remnants, distal parts strongly curved anteriad in the form of long horns. Posterior gonopods: gonopodal sternum poorly developed, membranous, only with anterior pair of concave bulges chitinized; coxotelopodites well-developed, massive, looking more robust than the anterior gonopods, distally with long setae, subdistally with pigmented remnants, mesally with two striking horns. Leg-pair 3 in females with sternal lobes. Vulvae unique, with poorly chitinized postgenital membranous structure, strongly developed and wrinkled; mesal valves of bursa completely fused, only with anterior fissure as evidence of former separation, posteriorly forming striking unpaired medial structure. Distribution. Known only from a few localities in the provinces of Alava, Gipuzkoa and Navarre , northern Spain ( Fig. 12 ).