Callianassa ( Callichirus ) oahuensis Edmondson, 1944: 56–59 Callianassa oahuensis Edmondson 1946: 262 Reappraisal of Hawaiian species of Corallianassa Manning, 1987 (Crustacea: Axiidea: Callichiridae) Poore, Gary C. B. Longenecker, Ken Tudge, Christopher C. Zootaxa 2023 2023-03-01 5249 2 277 289 (Edmondson, 1944) Poore & Longenecker & Tudge 2023 Edmondson 1944 [151,699,582,609] Malacostraca Callianassidae Corallianassa GBIF Animalia Decapoda 8 285 Arthropoda species oahuensis comb. nov.  ( Figs 6, 7, 8e–h, 9d–f)      Callianassa( Callichirus) oahuensis Edmondson, 1944: 56–59, fig. 10.    Callianassa oahuensis.—  Edmondson 1946: 262, fig. 159g, h.   Material examined.  USA, Hawaii, Oahu,  Hanauma Bay, C.H. Edmondson,  29 November 1938, BPBM S4594( holotypefemale, 12 mm); C.H. Edmondson, no date, BPBM S4596( 1 specimen); Oahu, Waikiki, J.M. Ostergaard,  16 Jun 1961, BPBM S6140( 6 specimens). Oahu, Kaneohe Bay, patch reef N of Ahu’olaka Island,  0–2 m, 21.489°N, 157.825°W, G. Paulay,  27 May 2017, UF 45530(ovigerous female, 9.7 mm).   Diagnosis. Rostrum upturned; carapace anterolateral spines with mesial buttress. Maxilliped 3 ischium-merus 2.4 times as long as wide; merus tapering; propodus, free distal margin transverse. Major cheliped ischium lower margin with 8–10 oblique spines increasing in length distally; merus lower margin with 4–8 small oblique spines; palm as long as wide, upper margin carinate along more than proximal half and along distal quarter. Minor cheliped merus lower margin with 2 or 3 oblique spines; palm 1.3 times as long as wide, rectangular; fingers as long as palm, curved. Uropodal endopod 2 times as long as wide; anterior margin slightly convex; posterior margin convex; apex broadly rounded, flat. Uropodal exopod posterior margin slightly concave; proximal article with sharp spine overlapping endopod and smaller accessory proximal lobe. Telson tapering to about two-thirds basal width from basal lobes, 1.7 times as wide as long; posterior margin with medial lobe more prominent than posterolateral corners; dorsal surface with about 6 pairs of fine setae in row on transverse ridge. Size.Cl. to 12 mm.  Colour. Carapace with paired orange anterodorsal patches; remainder of carapace, pleon white. Antennular peduncle article 3 orange; flagella orange-red. Antennal peduncle articles with orange patches; flagellum orangered. Maxilliped 3 with patches of orange. Cheliped meri, carpi with orange patches concentrated on upper margin; propodi mostly orange, with white patch at midpoint; fingers orange. Pereopods 2, 3 with orange patches on upper margins of carpus, propodus. Pereopods 4, 5 white ( Fig. 7a, b).   Distribution. USA, Hawaii, Oahu ( typelocality: Hanauma Bay)   Remarks. The holotypeof  Callianassa( Callichirus) oahuensis Edmondson, 1944(BPBM S4594) was examined by KL and compared with Edmondson’s (1944)figures and those of UF 45530. The holotypeplus the material listed above differ from  C. borradaileiin the discontinuous low carina along the upper margin of the major cheliped palm (flange-like in  C. borradailei), the relatively shorter and more tapered telson (1.7 vs 1.5 times wide as long), the absence of middorsal spiniform setae on the telson (3 or 4 pairs present), the upturned rostrum (horizontal) and the narrower maxilliped 3 (ischium-merus 2.4 vs 1.8 times as long as wide) with a more tapered merus.  Callianassa( Callichirus) oahuensis Edmondson, 1944has only ever been treated as a synonym of  Corallianassa borradailei( Manning 1987, Komai et al.2015). Here, we recognise it as an accepted species of  Corallianassa. 4040102306 1938-11-29 2017-05-27 1938-11-29 BPBM United States of America Oahu 1 21.489 Oahu 75 -157.825 Hanauma Bay 8 285 S4594, S4596, S6140, UF 45530 7 Hawaii holotype