Decapoda - Brachyura - Varunidae - Ptychognathus
| Ptychognathus easteranus Rathbun, 1907 |
World Distribution
Distribution (Garth, 1973: 325; Poupin, 1996a: 69), Mazancourt et al. (2024, Zootaxa): French Polynesia (Austral, Society), Easter Island.
Mazancourt et al. (2024, Zootaxa) — Ptychognathus easteranus occurs (Fig. 6) in the Cook Islands (Rarotonga), French Polynesia (Mangareva in the Gambier archipelago; Rapa and Rurutu in the Austral archipelago, Tahiti and Moorea in the Society archipelago) and Easter Island.
Environnement : Freshwater - Substrat/Association : Soft bottom (mud or sand)
Vertical range : Land & Freshwater - Min-Max observed: 0-1 m
Central Pacific data (Wallis & Futuna, Polynesia, Clipperton, Easter Island)
EASTER ISLAND - Ptychognathus easteranus Rathbun, 1907: 31 (Easter Island, shore; type locality). - Garth, 1973: 325 (Rathbun, sp. and Hanga Piko). - Boyko & Liguori, 2015: 516, Easter Island ("endemic", no mention of French Polynesian records).
FRENCH POLYNESIA - Ptychognathus easteranus - Marquet, 1988: 90, fig. 48, tab. 23; 1991: 132, tab. 1-2; 1993: tab. 1, 3 (Hiva Oa, Rurutu). - Poupin, 1996a: 6, 69 (Checklist). - Keith et al., 2002: 70, photograph (Atlas: Austral, Marquesas) - Unpublished specimens, MNHN - coll. Frv Marara, det. Poupin (Rapa, ?Tahiti-Taravao coll. ?1997, east coast, and 2002, west coast); coll. BENTHAUS Expedition, Rapa, det. J. Poupin. - AAMP, Marquesas, 2012, Leg 3, Fatu Hiva, river mouth, coll. Poupin, Starmer, sample LC168, MNHN-IU-2011-9062. - All spp. from Marquesas Islands corrected into P. crassimanus by Mazancourt et al. (2024, Zootaxa).
Ptychognathus intermedius - Ortmann, 1894: 711 (Tahiti). - Forest & Guinot, 1962: 72 (Biogeography "Tahiti-Tuamotu"). - Guinot, 1985: 453 (List). - Poupin, 1996a: 69 (Checklist). = P. easteranus see Mazancourt et al. (2024).
Ptychognathus easteranus — Mazancourt, Mazel, Marquet, Poupin & Keith, 2024 (Zoosystema): 276, COOK ISLANDS. Rarotonga (no specimens collected, observations only): Avana River, station 7, 21°14.808'S, 159°43.796'W, 13 July 2010; Aratiu River, 21°12.562'S, 159°47.280'W, 14 July 2010; Takavainé River, 21°12.562'S, 159°46.485'W, 14 July 2010; Murivai River, 21°14.802'S, 159°49.726'W, 15 July 2010. FRENCH POLYNESIA. Gambier archipelago. Mangareva: MNHN-IU-2022-4087 (DNA voucher: CA2670), 1 male, 15.0 mm × 12.2 mm; MNHN-IU-2022-4088 (DNA voucher: CA2671), 1 female ovig, 9.4 mm × 7.5 mm; MNHNIU-2022-4089, 8 male, 8.4–13.9 mm × 7.2–11.9 mm, 2 female ovig, 8.4–8.5 mm × 7.0–7.1 mm. Austral archipelago. Rapa: MNHN-IU-2022-4090 (DNA voucher: CA2654), 1 male, 13.5 mm × 12.1 mm; MNHN-IU-2022-4091(DNA voucher: CA2655), 1 male, 14.3 mm × 12.7 mm; MNHN-IU-2022-4092, 5 male, 10.7–13.7 mm × 9.1–11.8 mm; 5 female, 6.2–9.1 mm × 5.6–8.1 mm; 1 female ovig, 11.4 mm × 9.7 mm, Ahurei Bay, coll. J. Poupin, 8 November 2002; MNHN-IU-2022-4093, 3 male, 8.0–14.7 mm × 7.4–14.2 mm, coll. J.C. Guéry, G. Marquet, July 2001; MNHN-IU-2022-4094 (DNA voucher: CA2672), 1 male, 11.1 mm × 10.5 mm; MNHN-IU-2022-4095, 1 male, 9.4 mm × 8.4 mm (DNA voucher: CA2673), 7 male, 9.8–12.2 mm × 8.3–10.6 mm, 3 female, 6.9–8.1 mm × 5.8–7.01 mm, Ahurei Bay, coll. J. Poupin, 19–21 March 1995; MNHN-IU-2022-4096, 8 male, 7.1–14.0 mm × 6.3–12.4 mm,2 female ovig, 10.8–12.5 mm × 9.9–11.2 mm; 4 female, 6.6–8.8 mm × 5.8–7.4 mm, coll. J. Poupin, 8 November 2002; MNHN-IU-2022-4097 (DNA voucher: CA2667), 1 male, 13.7 mm × 14.6 mm; MNHN-IU-2022-4098, 3 male, 8.4–14.0 mm × 7.2–11.3 mm, 2 female, 7.9–11.6 mm × 7.3–10.5 mm, coll. J. C. Guéry & G. Marquet, July 2001. Rurutu: MNHN-IU-2019-179 (DNA voucher: CA2478), 1 male, 14.9 mm × 12.2 mm; MNHN-IU-2022-4099, 4 male, 8.1–13.8 mm × 6.5–11.2 mm, 3 female, 8.3–10.41 mm × 7.3–9.0 mm, "two rivers", coll. T. Robinet, 14 July 2007. Society Archipelago. Tahiti: MNHN-IU-2022-4100, 10 male, 6.4–15.4 mm × 5.7–13.8 mm, Papenoo River, sample 11, coll. V. Mazel, 6 February 2019; MNHN-IU-2022-4101 (DNA voucher: CA2717), 1 male, 17.1 mm × 14.5 mm; MNHN-IU-2022-4102, 6 male, 8.4 –12.4 mm × 7.6–11.1 mm, 2 female, 8.5–9.1 mm × 7.5–8.1 mm, Papenoo River, sample 9, coll. V. Mazel, 7 February 2019; MNHN-IU-2022-4103 (DNA voucher: CA2716), 1 male, 13.9 mm × 11.7 mm, Papenoo River, sample 1, coll. V. Mazel, 28 January 2020; MNHN-IU-2022-4104, 2 male, 9.4–12.4 mm × 8.7–11.2 mm, 3 female, 7.3–9.2 mm × 6.7–8.1 mm, Papenoo River, sample 5, coll. V. Mazel, 26 January 2020; MNHN-IU-2022-4105, 2 specimens, 14.0–15.0 mm × 11.9–11.9 mm, Papenoo River, sample 4, coll. V. Mazel, 24 January 2020; MNHN-IU-2022-4106, 7 male, 8.3–15.3 mm × 7.5–14.2 mm, 2 female, 6.5–8.9 mm × 5.4–7.7 mm, Papenoo River, sample 9, coll. V. Mazel, January 2020; MNHN-IU-2016-11891, 1 male, 9.6 mm × 12.5 mm, 1 female, 14.8 mm × 12.5 mm, Papenoo River, sample 2, coll. V. Mazel, 11 March 2019; MNHN-IU-2022-4107, 1 male, 13.5 mm × 11.4 mm, Papenoo River, sample 1, coll. V. Mazel 12 January 2020; MNHN-IU-2022-4108, 2 male, 8.5 mm × 7.6 mm, 11.2 mm × 10.3 mm, Papenoo River, sample 2, coll. V. Mazel, 11 November 2020; MNHN-IU-2016-11889, 1 male, 17.2 mm × 14.8 mm, Papenoo River, sample 1, coll. V. Mazel, 12 March 2021; MNHN-IU-2022-4109 (DNA voucher: CA2645), 1 male, 16.5 mm × 14.7 mm; MNHN-IU-2022-4110, 1 male, 6.0 mm × 5.3 mm, 1 female, 6.9 mm × 5.9 mm, Papenoo River, sample 3, coll. V. Mazel, 14 March 2021; MNHN-IU-2022-4111, 2 male, 13.4–15.7 mm × 11.8–13.7 mm, Papenoo River, sample 9, coll. V. Mazel, 11 January 2021; MNHN-IU-2022-4112, 1 male, 12.0 mm × 10.6 mm, Papenoo River, sample 1, coll. V. Mazel, 18 December 2020; MNHN-IU-2022-4113 (DNA voucher: CA2644), 1 male, 15.0 mm × 12.0 mm, Papenoo River, sample 11, coll. V. Mazel, 15 January 2021.
Other data
Benthaus Polynesie, STATION — Ng P.K.L & Richer de Forges B., Compendium of marine species from New Caledonia, Vol II7, TTTT: 315-332
Comment(s) on data
Mazancourt et al. (2024, Zootaxa) — Ortmann (1894: 711) reported a specimen of Ptychognathus intermedius (De Man, 1879) from Tahiti. This specimen, deposited in Strasbourg Zoological Museum (MZS) has been reexamined and compared herein with the type specimen of P. intermedius (Fig. 16C) from the Moluccas. It appears in fact to be typical P. easteranus, with its type illustrated alongside in the same figure (Fig. 16D). Therefore, P. intermedius is removed from the Polynesian fauna, its distribution being limited to its type locality in the Moluccas (Indonesia).
References : PDF list, 214 pp (1.4 Mo)This species in Worms Database