Reappraisal of species attributed to Halicarcinus White, 1846 (Crustacea: Decapoda: Brachyura: Hymenosomatidae) with diagnosis of four new genera and one new species from New Ireland, Papua New Guinea Author Poore, Gary C. B. Author Guinot, Danièle Author Komai, Tomoyuki Author Naruse, Tohru text Zootaxa 2016 4093 4 480 514 journal article 10.11646/zootaxa.4093.4.2 70a997e1-3680-457f-86ce-c288168b0cf0 1175-5326 258478 5E0BF4DB-04EA-4A9A-BF47-901DF84FFD39 Halicarcinus planatus ( Fabricius, 1775 ) ( Figs 1 d, 2) Cancer planatus Fabricius, 1775 : 403 . Hymenosoma Leachii Guérin, 1832 , in Guérin-Méneville 1829–1837 : 10, pl. 10 fig. 1 (see Low et al. 2013 for citation ). Hymonosema [sic] leachii— Guérin 1838 : 22–23 . Halicarcinus planatus— White 1847 : 33 –34. — Melrose 1975 : 34 –39, figs 12, 13 (for extensive synonymy). — Gorny 1999: 372– 379 (distribution). — Diez & Loverich 2009: 389–401 (reproduction). — Poore 2004 : 394 , fig. 121d. — Webber 2010 : 181 , 226. — Aronson et al . 2015 : 2 –4, fig. 2 (distribution). Halicarcinus pubescens Dana, 1851 : 253 . Elamene [sic] mexicana H. Milne Edwards, 1853 : 224 . Elamena mexicana— Tavares & Santana 2015 : 103 , fig. 3B. Halicarcinus patagoniensis Melrose, 1975 (unnecessary replacement name for Halicarcinus pubescens Dana, 1851 ). Material examined . Lectotype of Hymenosoma leachii Guérin, 1832 , in Guérin-Méneville 1829–1837 , herein selected. Côtes de Nouvelle-Hollande (southern Australia ), MNHN IU-2000-647 (B647), (male, 10 mm , dry). Holotype of Elamena mexicana H. Milne Edwards, 1853 . ‘ Côtes du Mexique ’ (see remarks below). MNHN IU-2000-655 (B655), (male, 7.3 mm , dry). Other material. Kerguelen I., NMV J8080 (male, 10. 6 mm ); MNHN IU-2014-0000 (B25953), ( 1 male , 17.0 mm; 1 ovigerous female, 15.0 mm). Australia . Macquarie I., NMV J7543 (1 ovigerous female, 12.0 mm). New Zealand , Campbell I., AM P.36830 ( 1 male , 20 mm ; 1 ovigerous female, 20 mm ) selected from numerous specimens at NMV and AM; MNHN IU-2014-0000 (B25960), ( 1 male , 15.0 mm, several males and females). Distribution . Widespread throughout the subantarctic islands, southern New Zealand and South America (Gorny 1999), Deception I., South Shetland Is ( Aronson et al . 2015 ). The only Australian occurrence is at subantarctic Macquarie I. Remarks . In her discussion of the homonymy of Halicarcinus pubescens Dana, 1851 , from Patagonia ( Argentina ) with Hymenicus pubescens Dana, 1851 , from New Zealand that she placed together in Halicarcinus , Melrose (1975: 253, 254) proposed the replacement name Halicarcinus patagoniensis Melrose, 1975 , for the former. Halicarcinus pubescens Dana, 1851 , is now considered a junior synonym of H. planatus and Hymenicus pubescens Dana, 1851 , is now Neohymenicus pubescens ( Dana, 1851 ) following Lucas’s (1980) revision. Melrose (1975: 34) included Hymenosoma leachii Guérin, 1832 , as a questionable synonym of Halicarcinus planatus . Having looked at a type specimen we can confirm this but doubt that the type locality ‘ les côtes de la Nouvelle-Hollande ’ (southern Australia ) recorded by Guérin (1838) is correct; the species has not otherwise been recorded from southern Australia . Tavares & Santana (2015) proposed Elamena mexicana H. Milne Edwards, 1853 , as a synonym of Halicarcinus planatus . We agree with this and with their conclusion that the most likely type locality for this taxon is not Mexico but Peru or Chile . It clearly has a similar rostrum and preocular pseudorostral lobes, which are demarcated from the carapace by a distinct hymenosomian groove, and relatively wide maxillipeds 3 that cover almost the entire buccal cavern. a1 a2 a b c