Pilumnus curvipenis Komai and Motoh 2012
Creators: name: Zou, Wenjun
name: Jiang, Qin
name: Wang, Yanling
name: Wei, Wenbin
name: Sun, Xiaodong
name: Basu, Karen
name: Chen, Qiuyu
name: Kotecha, Aachal
name: Li, Sijing
name: Liu, Ruyuan
name: Patel, Vaibhavi
name: Chen, Youxin
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Pilumnidae
Pilumnus
Pilumnus curvipenis

description: Pilumnus curvipenis Komai and Motoh, 2012
(Fig. 4A)
Pilumnus dofleini Balss, 1933: Ng, 2000, p. 301, figs. 1–2. — Takeda & Komatsu, 2005, p. 284.
Pilumnus curvipenis Komai & Motoh, 2012, p. 17, figs. 12–13, 18A–B. — Takeda & Komatsu, 2020, p. 111.
Material examined. Takase submarine bank (Fig. 1; 34°28.64′N, 139°12.26′E, 105 m depth), northwest off Nii-jima I., Izu Is., 1 8 (NSMT-Cr 11034; cb 4.7×cl 3.7 mm), 11-IX-1989, dredged by TV Umitaka Maru of Tokyo University of Fisheries (now, Tokyo University of Marine Science and Technology) and donated by T. Okutani; Takase submarine bank (34°26.11′N, 139°09.75′E, 112 m depth), 1 ovig.8 (NSMT-Cr 11052; cb 5.8×cl 3.8 mm), 11-IX-1989, dredged by TV Umitaka Maru.
Comparative material examined. Shin-Kurose submarine bank (Fig. 1; 33°32′N, 140°10′E), southeast off Mikura-jima I., Izu Is., 160–230 m depth, 3 ƏƏ, 1 ovig.8 (NSMT-Cr 6665), 26-XI-1974, T. Okutani leg.; Hyotanse submarine bank (Fig. 1; 34°21′N, 139°02.36′E, 105 m depth), northwest off Kozu-shima I., Izu Is., 1 ovig.8 (NSMT-Cr 6666), 26-VI-1973, T. Okutani leg.
Off Kasari Bay, Amami-Oshima I., Ryukyu Is., 120–122 m depth, 1 Ə (NSMT-Cr 16204; cb, left branchial region heavily deformed×cl 2.6 mm), dredged by tugboat Daiyu Maru No. 38; Off Nakahise-saki, Amami-Oshima I., 117–123 m depth, 1 ovig.8 (NSMT-Cr 16201; cb 5.0×cl 3.3 mm), by Daiyu Maru No. 38.
Remarks. The specimens from Shin-Kurose and Hyotanse (NSMT-Cr 6665, 6666) were recorded by Ng (2000) as Pilumnus dofleini Balss, 1933, but later described as a new species, P. curvipenis, by Komai and Motoh (2012). One male (NSMT-Cr 6665; cb 11.4×cl 14.2 mm) was selected as the holotype, and two males (cb 8.0×cl 9.5 mm; cb 8.8×cl 10.2 mm) and one ovigerous female (cb 13.4×cl 16.4 mm) in the same lot were designated as the paratypes with new registered number, NSMT-Cr 22177, together with one ovigerous female (NSMT-Cr 6666; cb 12.3×cl 14.8 mm).
As for the specimens from Amami-Oshima Island, it is noted that Takeda and Komatsu (2005) recorded a male (MSMT-Cr 16204; cl 2.6 mm) as Pilumnus dofleini, and an ovigerous female (NSMT-Cr 16201; cb 5.0×cl 3.3 mm) as Nanopilumnus sp.
During this study, the type specimens (NSMTCr 6665, 6666, 22177) and additional two females (one ovigerous) (NSMT-Cr 11034, 11052) from submarine banks off the Izu Islands, and one male (NSMT-Cr 16204) and one ovigerous female (NSMT-Cr 16201) from off Amami-Oshima Island, Ryukyu Islands, were re-examined. The armature of the carapace anterolateral margins illustrated by Ng (2000, fig. 1a) and Komai and Motoh (2012, fig. 18A) seem to be somewhat different from each other. In the present specimens (Fig. 4A), the anterolateral teeth are not spinulate, but distinctly toothed, being close to those of the carapace right side in Komai and Motoh`s figure (fig. 18A). The most obvious character of P. curvipenis is the G1 shape as figured by Ng (2000, fig. 2b–e, as P. dofleini) and Komai and Motoh (2012, figs. 13F–I). The distal part of the G1 is short and strongly bent, somewhat similar to that of P. bohol Komai and Motoh, 2012 in which, however, the distal part is shorter and only weakly curved, not vent at all.
The specimens from off Amami-Oshima Island previously reported as P. dofleini (NSMTCr 16204) and Nanopilumnus sp. (NSMT-Cr 16201) by Takeda and Komatsu (2005) agree well with the type specimens of P. curvipenis from the Izu Islands off the Pacific coast of central Japan, and also with notes on three females from the west of Amami-Oshima Island, 120 m depth, and a male from off Naha, Okinawa-jima Island, Ryukyu Islands, 60–70 m depth, made by Takeda and Komatsu (2020).
Distribution. Known from some submarine banks off the Izu Islands, south of Tokyo, and from off Amami-Oshima Island and Okinawa-jima Island in the Ryukyu Islands; 60–230m depth.
description: Published as part of Zou, Wenjun, Jiang, Qin, Wang, Yanling, Wei, Wenbin, Sun, Xiaodong, Basu, Karen, Chen, Qiuyu, Kotecha, Aachal, Li, Sijing, Liu, Ruyuan, Patel, Vaibhavi & Chen, Youxin, 2024, One New and Two Rare Species of the Genus Pilumnus Leach, 1816 (Crustacea: Decapoda: Brachyura: Pilumnidae) from Takase Submarine Bank off the Izu Islands, South of Tokyo, Japan, pp. 145-153 in Bulletin of the National Museum of Nature and Science. Series A, Zoology (Philadelphia, Pa.) (Philadelphia, Pa.) 50 (4) on pages 146-148, DOI: 10.50826/bnmnszool.50.4_145, http://zenodo.org/record/14680409