Homola dickinsoni Eldredge 1980
Creators: name: Ng, Peter K. L.
name: Forges, Bertrand Richer De
name: Martin, Joel W.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Homolidae
Homola
Homola dickinsoni

description: <i>Homola dickinsoni</i> Eldredge, 1980 (Fig. 1F) <i>Homola dickinsoni</i> Eldredge, 1980: 274, figs. 2, 3; Guinot &amp; Richer de Forges 1995: 338, figs. 9g, 13e, 14a, b; Ng <i>et al.</i> 2008: 40; Castro 2011: 34. <i>Homola ikedai</i> — Guinot &amp; Richer de Forges 1981: 536, figs. 2A, A1, pl. 2 figs. 2, 2a, 2b, pl. 8 fig. 1, 1a (not <i>Homola ikedai</i> Sakai, 1979). ? <i>Homola ikedai</i> — Titgen 1988: 144. <b>Material examined</b>. <b>Guam</b>: 1 male holotype (42.0 × 37.0 mm) (BPBM S8595), off Double Reef, 366 m, coll. trap number 49, 6August 1975.— 1 female paratype (32.0 × 26.6 mm) (BPBM S8596), same data as holotype.— 1 female (45.6 × 36.7 mm) (ZRC 1997.0691), Double Reef, 243.8 m, coll. shrimp trap, 30 January 1976.— 1 female (BPBM S10479), Double Reef, 243.8 m, shrimp trap, 30 November 1976.— 1 female (40.0 × 31.5 mm) (ZRC 2001.0758), left tip of Anae and Silver Reef top, Anae Island, coll. shrimp trap, 16 October 1975.— 1 female (BPBM S10477), Oca Point (= Hospital Point), 457.2 m, in shrimp trap number 15, coll. November 1973 - April 1974. <b>Hawaiian Islands</b>: 1 male (40.3 × 33.3 mm) (BPBM S1976.259), Pearl Harbour entrance, O‘ahu, 340 m, coll. “Easy Rider”, E. Chave, in shrimp trawl, 27 September 1976.— 1 male (42.0 × 36.3 mm) (LACM-MBC-5503), reef slope, station FFS-0001, DRS-1, BAIT-1, 23.74°N 166.387°W– 23.734°N 166.381°W, NWI, French Frigate Shoals, 180–250 m, baited trap, coll. R. Moffitt, T. Lotufo, K. Coontz, L. Harris, E. Soto &amp; C. Pittman, 11 October 2006 (photograph voucher JM0038). <b>Remarks</b>. Our specimen agrees well with the original description of the species from Guam by Eldredge (1980) as well as the subsequent redescription and photographs of the paratypes in Guinot &amp; Richer de Forges (1995: figs. 9g, 13e, 14a, b). The only previous record of the species in Hawaii is a report by Titgen (1988) based on two speci- mens collected in 1976 at 338 m depth near the entrance to Pearl Harbor in O‘ahu. Titgen (1988: 144) referred these two specimens to <i>Homola ikedai</i> Sakai, 1979, but after examining one of Titgen’s specimens (a 40.3 mm carapace length male, BPBM Acc. No. 1976.259), Guinot &amp; Richer de Forges tentatively assigned it to <i>Homola dickinsoni</i> instead. As discussed by Richer de Forges &amp; Ng (2007: 32), <i>H. dickinsoni</i> belongs to a group of species that have in common a strongly rectangular carapace and a strong anterolateral tooth. This group includes, in addition to <i>H. dickinsoni</i>, <i>H. ikedai</i> from the western Pacific, <i>H. eldredgei</i> from the Indian Ocean (Seychelles), and <i>H. coriolisi</i> from New Caledonia and the Loyalty Islands (see Richer de Forges &amp; Ng 2007; Cleva <i>et al.</i> 2007). <i>Homola dickinsoni</i> is morphologically similar to the relatively smaller <i>H. ikedai</i> (see Guinot &amp; Richer de Forges 1995: 340) and can be misidentified. Richer de Forges &amp; Ng (2007: 33) separated <i>H. dickinsoni</i> in that the tip of its rostrum is minutely bifid (simple in <i>H. ikedai</i>), the carpus of the cheliped is more spinous, the P3 and P4 merus has two rows of ventral spines (unarmed in <i>H. ikedai</i>), and the P5 merus is relatively shorter, with four or five ventral spines (merus relatively longer and with three ventral spines in <i>H. ikedai</i>). On this basis, the six specimens from Balicasag Island in the Philippines referred to “ <i>H. dickinsoni</i> ” by Takeda &amp; Manuel-Santos (2007: 87) were referred to <i>H. ikedai</i> as well by Richer de Forges &amp; Ng (2007: 33). The fresh colour of <i>H. dickinsoni</i> (Fig. 2F) shown here for the first time provides another differentiator. In <i>H. ikedai</i>, the chelae and dactyli of the ambulatory legs are white (Richer de Forges &amp; Ng, 2007: fig. 1B) whereas these structures are all orange, with faint light banding on the merus of the ambulatory legs, in <i>H. dickinsoni</i> (Fig. 1F). On the basis of the above characters, the present specimen from Hawai‘i and Titgen’s (1988) material are clearly <i>H. dickinsoni</i>. <b>Distribution</b>. Known only from Guam and the Hawaiian Islands (O‘ahu), 300–500 m (Eldredge 1980; Guinot &amp; Richer de Forges 1995; Richer de Forges &amp; Ng 2007), and now from the Northwestern Hawaiian Islands (French Frigate Shoals).
description: Published as part of <i>Ng, Peter K. L., Forges, Bertrand Richer De &amp; Martin, Joel W., 2020, The Homolidae of the Hawaiian Islands, with notes on the taxonomy of Moloha major (Kubo, 1936) (Crustacea: Decapoda: Brachyura), pp. 306-328 in Zootaxa 4809 (2)</i> on pages 308-310, DOI: 10.11646/zootaxa.4809.2.4, http://zenodo.org/record/3934146
description: {"references": ["Eldredge, L. G. (1980) Two species of Homola (Dromiacea, Homolidae) from Guam. Micronesica, 16 (2), 271 - 277.", "Guinot, D. &amp; Richer de Forges, B. (1995) Crustacea Decapoda Brachyura: Revision de la famille des Homolidae de Haan, 1839. In: Crosnier, A. (Ed.), Resultats des campagnes MUSORSTOM, Volume 13. Memoires du Museum national d'Histoire naturelle. Vol. 163. Paris: Editions du Museum. Pp. 283 - 517, figs. 1 - 76.", "Ng, P. K. L., Guinot, D. &amp; Davie, P. J. F. (2008) Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology 17, 1 - 286.", "Castro, P. (2011) Catalog of the anomuran and brachyuran crabs (Crustacea: Decapoda: Anomura, Brachyura) of the Hawaiian Islands. Zootaxa, 2947, 1 - 154.", "Guinot, D. &amp; Richer de Forges, B. (1981) Homolidae, rares ou nouveaux, de l'Indo-Pacifique (Crustacea, Decapoda, Brachyura). Bulletin du Museum national d'Histoire naturelle, Series 4, Section A 8 (2), 523 - 581, figs. 1 - 7, pls. 1 - 8, tables 1, 2, maps 1, 2.", "Sakai, T. (1979) Descriptions of three new species of crabs of the family Homolidae from Japan. Research on Crustacea, 9, 1 - 11.", "Titgen, R. H. (1988) New decapod records from the Hawaiian Islands (Crustacea, Decapoda). Pacific Science, 41 (1 - 4), 141 - 147.", "Richer de Forges, B. &amp; Ng, P. K. L. (2007) New records and new species of Homolidae De Haan, 1839, from the Philippines and French Polynesia (Crustacea: Decapoda: Brachyura). Raffles Bulletin of Zoology, Supplement 16, 29 - 45.", "Cleva, R., Guinot, D. &amp; Albenga, L. (2007) Annotated catalogue of brachyuran type specimens (Crustacea, Decapoda, Brachyura) deposited in the Museum national d'Histoire naturelle, Paris. Part I. Podotremata. Zoosystema, 29 (2), 229 - 279, figs. 1 - 28.", "Takeda, M. &amp; Manuel-Santos, M. R. (2007) Crabs from Balicasag Island, Bohol, the Philippines: Dromidae, Dynomenidae, Homolidae, Raninidae, Dorippidae, and Calappidae. Memoirs of the National Science Museum, Tokyo, 2006, (44), 84 - 104. (published in March 2007)"]}