Euryxanthops flexidentatus Garth and Kim, 1983

Alrasheedi, Sami M, Alrashdi, Mousa N, Alhumaidan, Lama S, Alkhdairi, Ahmad, Alzweihary, Ali M, Alhussaini, Omar M, Alharbi, Lama S, Albalawi, Amirah N, Almutairi, Turki F, Alharbi, Osama A G & Bashal, Afaf A M, 2024, Crabs of the Families Tetraliidae, Trapeziidae and Xanthidae (Crustacea: Decapoda: Brachyura) new to the Ogasawara Islands, Japan, Bulletin of the National Museum of Nature and Science. Series A, Zoology 50 (1), pp. 1-17 : 5

publication ID

https://doi.org/ 10.50826/bnmnszool.50.1_1

DOI

https://doi.org/10.5281/zenodo.12572056

persistent identifier

https://treatment.plazi.org/id/03EC8797-FFBB-FFB9-FF66-FB4D363DFA48

treatment provided by

Felipe

scientific name

Euryxanthops flexidentatus Garth and Kim, 1983
status

 

Euryxanthops flexidentatus Garth and Kim, 1983 View in CoL

[Jn: Usuiro-hira-ougigani]

( Fig. 2D View Fig )

Material examined. Kaikata Seamount— 486 m, 1 ♂ (NSMT-Cr 31519; cb 22.3×cl 16.4 mm), 1 ♀ (NSMT-Cr 31520; cb 17.5×cl 12.5 mm), 15-VII-1991, Shinkai 2000, #558, JAMSTEC leg.

Nikko Seamount— 460 m, 1♂ (NSMT-Cr 31521; cb 28.3×cl 19.9 mm), 19-IX-1992, Shinkai 6500, #144, JAMSTEC leg.

Remarks. This species, one of six congeners of the genus Euryxanthops Garth and Kim, 1983 , was originally described on the basis of a single male specimen from off northwestern Mindanao, the Philippines ( Garth and Kim, 1983, p. 678, fig. 3). Recently, additional specimens were recorded and remarked on the variations by Davie (1997), Ng and McLay (2007), Kuo et al. (2015), Mendoza et al. (2021), and Sato and Aiba (2022). This species is characteristic in the thin and weakly upturned anterolateral margins of the carapace, with keys prepared by Davie (1997) and Ng and McLay (2007). In these keys, the shape of the first anterolateral tooth is considered as the important criterion to distinguish the species, but Mendoza et al. (2021) showed that the original illustrations are not always accurate in the proportion and first anterolateral tooth of the carapace, and that the G1 of the holotype is damaged at its tip. The G 1 in the present specimens (NSMT-Cr 31519, 31521) agrees well with the figure of Kuo et al. (2015, fig. 2), having several long hairs at the subterminal part. Although, in the published photographs and line drawings, the carapace dorsal areolation is not always clearly shown, but it is remarked at present in all the present specimens that a deep, strongly curved gutter was engraved at each side of the transverse depression between the median gastric and cardiac regions.

Distribution. Known from the Philippines (type locality, northern Mindanao, 327.6 m), southern Taiwan (265–300 m), Indonesia (Sunda Strait and southwestern Java, 234–281 m), and Japan (Off Miyazaki Prefecture, Kyushu, 350 m). As Sato and Aiba (2022) already mentioned, Euryxanthops sp. from Sagami Bay, 220–280 m, recorded by Ikeda (1998, fig. 10) is referred to this species. Xanthidae gen. et sp. recorded by Fujikura et al. (2008, fig. 11.35) from Kaikata, Nikko, Daini-Kasuga, and Daikoku seamounts, Ogasawara-Mariana Arc, 400–500 m, is also probably referred to this species.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Xanthidae

Genus

Euryxanthops

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