A new species of supergiant Bathynomus A. Milne-Edwards, 1879 (Crustacea, Isopoda, Cirolanidae) from Vietnam, with notes on the taxonomy of Bathynomus jamesi Kou, Chen &amp; Li, 2017

Peter K. L. Ng; Conni M. Sidabalok; Thanh Son Nguyen

doi:10.3897/zookeys.1223.139335

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ZooKeys 1223: 289-310
https://doi.org/10.3897/zookeys.1223.139335 (14 Jan 2025)

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Figure 1. Download

Bathynomus jamesi Kou, Chen & Li, 2017, colour in life, dorsal views A ♂ (300 mm) (ZRC 2024.0088), Vietnam B ♀ (280 mm) (ZRC 2024.0088), Vietnam C ♂ (410 mm) (ZRC 2024.0179), Vietnam.

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Dorsal views. Bathynomus jamesi Kou, Chen & Li, 2017 A ♂ (320 mm) (MNHN IS.2290), Philippines B ♂ (296 mm) (TMCD 3333), Taiwan C ♂ (330 mm) (TMCD 3334), Taiwan D, E ♀ (288 mm) (TMCD 3329), Taiwan F ♀ (303 mm) (TMCD 3326), Taiwan.

Figure 3. Download

Pleotelson, dorsal views. Bathynomus jamesi Kou, Chen & Li, 2017 A ♀ (288 mm) (TMCD 3329), Taiwan B ♀ (303 mm) (TMCD 3326), Taiwan C ♂ (369 mm) (TMCD 3327), Taiwan D ♀ (260 mm) (TMCD 3331), Taiwan E ♂ (407 mm) (ZRC 2024.0118), Vietnam F ♀ (293 mm) (ZRC 2024.0119), Vietnam.

Figure 4. Download

Bathynomus vaderi sp. nov., paratype ♂ (258 mm) (ZVNU 110001), Vietnam, colour in life A dorsal view B body, ventral view C cephalon, anterior view.

Figure 5. Download

Bathynomus vaderi sp. nov., holotype ♂ (266 mm) (ZRC 2022.0621), Vietnam A dorsal view B cephalon, anterior view C clypeal region and buccal cavity D body, lateral view.

Figure 6. Download

Bathynomus vaderi sp. nov., holotype ♂ (266 mm) (ZRC 2022.0621), Vietnam A dorsal view B cephalon, anterior view C clypeal region D body, lateral view E pereon, lateral view F pleotelson. Scale bars: 2.0 cm (A, D–F); 1.0 cm (B, C).

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Bathynomus vaderi sp. nov., holotype ♂ (266 mm) (ZRC 2022.0621), Vietnam A right maxilliped palp, outer view B right maxilliped endite, inner view, setae omitted C right maxilla D left mandible and palp, outer view E lateral lobe of right maxilulla, outer view. Scale bars: 2.0 mm.

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Bathynomus vaderi sp. nov., holotype ♂ (266 mm) (ZRC 2022.0621), Vietnam A pereopod 1 B pereopod 2 C pereopod 7 D uropod, ventral view E uropod, dorsal view. Scale bars: 1.0 cm (A–C); 2.0 cm (D, E).

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A–D Bathynomus vaderi sp. nov., holotype ♂ (266 mm) (ZRC 2022.0621), Vietnam E–H B. jamesi Kou, Chen & Li, 2017, ♂ (320 mm) (MNHN IS.2290), Philippines A, E clypeal region B, F pereon lateral view C, G pleotelson, dorsal view D, H pleotelson, lateral view. Abbreviations: c6 = coxa of pereopod 6; c7 = coxa of pereopod 7.

Figure 10. Download

Appendix masculina A Bathynomus vaderi sp. nov., paratype ♂ (270 mm) (ZRC 2024.0176) B ♂ B. jamesi Kou, Chen & Li, 2017 (320 mm) (MNHN IS.2290), Philippines C B. jamesi Kou, Chen & Li, 2017 ♂ (296 mm) (TMCD 3333), Taiwan D B. jamesi Kou, Chen & Li, 2017 ♂ (314 mm) (TMCD 3328), Taiwan.

Figure 11. Download

Seafood market in Hanoi, Vietnam, selling Bathynomus jamesi A, B chilled water tanks keeping specimens alive for sale C three large specimens weighing 7.7 kg D Large specimens exceeding 2 kg in weight command premium prices.

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