| Summary: | Key to described Halirages species amended after d’Udekem d’Acoz, 2012 including Halirages spongiae sp. nov. Lörz, Nack & Tandberg 1. Ep3 with strong posteromedian and posteroventral tooth (posterior border forming an angular protrusion) (Example A). 2 – Ep3 with posteroventral tooth only (posterior border rounded, but can have a minute posteromedian protrusion) (Example B). 4 2. Pereionite 7 with 0–1 posterodorsal tooth; pleonite 1 and 2 with 1 posterodorsal tooth. 3 – Pereionite 7 and pleonites 1–2 with 3 posterodorsal teeth. H. nilssoni Ohlin, 1895 3. Telson distally truncated and slightly concave; ventral border of coxae 1–2 smooth; posterior border of basis of P5–7 with very weak crenulations; carpus of Gn1–2 equal to propodus. H. fulvocinctus (M. Sars, 1859) – Telson pointed, with large distal tooth flanked by 2 pairs of small lateral subdistal teeth; ventral border of coxae 1–2 and posterior border of basis of P5–7 distinctly serrate; carpus of Gn1–2; distinctly longer than propodus. H. stappersi d’Udekem d’Acoz, 2012 4. Ventral lobe of head produced into a sharp tooth; carpus of P1–2 about 4× as long as broad or narrower; at least some segments of pleon with posterodorsal tooth; telson pointed; bathyal and abyssal species. 5 – Ventral lobe of head bluntly subquadrate; carpus of P1–2 a bit less than 2× as long as broad; pleon smooth, segments without posterodorsal tooth; telson truncated; infralittoral species. H. mixtus Stephensen, 1931 5. Eyes present. 6 – Eyes absent. 8 6. Eye small and subreniform; coxa 1 with anteroventral corner forming a square angle; ventral border of coxa 1 with about 10 weak crenulations; posteroventral corner of basis of P7 bluntly angular; pereionite 7 (but never 6) and pleonites 1–2 with posterodorsal tooth; tip of telson with a single distal tooth. H. cainae d’Udekem d’Acoz, 2012 – Eye large, tip of telson tridentate. 7 North Atlantic, on continental shelf breaksNorth Atlantic, East off Iceland 7. Eye large and subreniform; coxa 1 with anteroventral corner pointing ...
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