Late Oligocene decapod crustaceans from the Trbovlje Formation of Slovenia, with a description of two new species of hymenosomatid crabs Author Gašparič, Rok Author Hyžný, Matúš Author Hitij, Tomaž Author Šoster, Aleš text Palaeontologia Electronica 2024 a 4 27 1 1 16 http://dx.doi.org/10.26879/1312 journal article 294473 10.26879/1312 8d351e9f-9cd6-44e9-bfc1-5f5cb767a157 1094-8074 10962373 71FEB770-6EE3-4621-B752-872A1CBDB605 Genus HALICARCINUS White, 1846 Type species. Cancer planatus Fabricius, 1775 , by original designation. Remarks. Hymenosomatidae MacLeay, 1838 , comprises 24 genera and over 130 species ( Poore et al., 2016 ) of which Halicarcinus White, 1846 , was the most diverse and morphologically heterogeneous. Poore et al. (2016) have revised Halicarcinus and reassigned the species to seven genera to accommodate the diversity previously encompassed in the genus. Currently Halicarcinus includes seven species characterised by the complete hymenosomian groove, well-developed epistome, rostrum developed as median tubercle with paired pseudorostral elements, strongly curved gonopod 1, pleomeres 1-5 free, pleomere 6 fused to telson (pleotelson), pereopodal dactylar teeth shorter than in other genera, and propodi of male chelipeds frequently swollen and barrel-like ( Naruse and Komai, 2009 ; Poore et al., 2016 ).