Tirons of the world: a review of ‘ tironid’ amphipods, description of new genera and species, and establishment of a new subfamily Tironinae Stebbing, 1906 stat. nov. (Crustacea, Synopiidae) Author Just, Jean text Zootaxa 2022 2022-05-23 5139 1 1 89 http://zoobank.org/145cb6f5-2ea8-40b0-9cca-3e942aa4a5b9 journal article 95147 10.11646/zootaxa.5139.1.1 8ab25605-ec09-4d57-9dbd-7da2b032e5e8 1175-5326 6572023 145CB6F5-2EA8-40B0-9CCA-3E942AA4A5B9 Key to species of Minitiron gen. nov. 1. Maxilla 1 palp reduced, half-length of outer plate, with a single simple seta; inner plate narrow, pointed, nearly as long as outer plate, with spaced row of small setae along medial margin; mandible with long simple seta in place of palp................................................................................................ M. bellairsi ( Just, 1981 ) - Maxilla 1 palp reaching to about apex of outer plate setal spines, with a few apical peg-like setae, inner plate stout, subequal in length to outer plate, with a few apical setae on apex, mandible without seta in place of palp.......................... 2 2. Maxilliped outer plate concave medially to pointed apex...................................................... 3 - Maxilliped outer plate with normal truncate or rounded apex................................................... 4 3. Coxal plate 1 twice as long as broad, anterior margin broadly pointing in middle, rounded distally; pereopod 7 basis posterior margin evenly convex with regular crenation.............................. M. galeatus ( Hirayama, 1988 ) comb. nov. - Coxal plate 1 about 1.5 longer than broad, widest distally, anterior margin nearly straight............................................................................................... M. thompsoni ( Walker, 1904 ) comb. nov. 4. Head lateral front lobe rounded truncate; coxal plate 1 anterior margin broadly rounded; coxal plate 3 distal half widening to near twice width of proximal half, with rounded anterodistal projection........... M. caecus ( Ledoyer, 1979 ) comb. nov. - Head lateral front lobe pointed or rounded right angle; coxal plate 1 anterior margin not broadly rounded; coxal plate 3 anterior margin straight, posterior margin with projection in distal half.................................................. 5 5. Maxilla 1 inner plate margins parallel, apex blunt with 3 pectinate setae; coxal plate 1 wide-angle rounded, anterior margin with broad 90% triangular projection; coxal plate 3 with angular, slightly crenate posterior margin and midposterior projection; pleonites 1–3 posterodistal corners acute................................. M. ovatibasis ( Hirayama, 1988 ) comb. nov. - Maxilla 1 inner plate tapering, apex blunt with a few setae; coxal plate 1 anterior margin straight; coxal plate 3 midposterior projection broadly rounded wide-angled; pleonites 1–3 posterodistal corners rounded................. M. orpheus sp. nov.