Redescription of <i>Vellumnus penicillatus</i> (Gordon, 1930) from Hong Kong and description of a new species from Macclesfield Bank, South China Sea (Crustacea: Brachyura: Pilumnidae)

The poorly known pilumnid, Vellumnus penicillatus (Gordon, 1930), is redescribed by examining the Hong Kong types. A new species, Vellumnus tki n. sp., is described from Macclesfield Bank, South China Sea, and it is distinguished from its closest congener, Vellumnus minabensis (Sakai, 1969) from Japan, by the setal pattern on the carapace and pereiopods, carapace proportions, structure of the front and anterolateral teeth, armature on the chelipeds and relatively shorter ambulatory legs.

Keywords
Japan; new species; taxonomy; Vellumnus Ng; 2010; V. minabensis; V. tki

Authorship

Peter K. L. Ng

Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore. 2 Conservatory Drive, Singapore 117377, Republic of Singapore.National University of SingaporeRepublic of SingaporeRepublic of Singapore Lee Kong Chian Natural History Museum, Faculty of Science, National University of Singapore. 2 Conservatory Drive, Singapore 117377, Republic of Singapore.

https://orcid.org/0000-0001-5946-0608

Paul F. Clark

Invertebrates Division, Department of Life Sciences, The Natural History Museum. Cromwell Road, London SW7 5BD, England.The Natural History MuseumEnglandEnglandInvertebrates Division, Department of Life Sciences, The Natural History Museum. Cromwell Road, London SW7 5BD, England.

https://orcid.org/0000-0001-6862-3982

Corresponding Author
Paul F. Clark p.clark@nhm.ac.uk

PKLN E-mail: peterng@nus.edu.sg

PFC E-mail: p.clark@nhm.ac.uk

Associate Editor:

Dr. Marcos Tavares

Author Contributions

Equal contributions throughout.

Competing interests

The authors have no conflicts of interest to declare.

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (6)

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Figure 1.
Vellumnus penicillatus (Gordon, 1930). A, Holotype female (4.2 × 2.9 mm) (NHM 1930.12.2.123), Hong Kong; B, C, paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong. A, B, overall dorsal view; C, ventral view of cephalothorax.

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Figure 2.
Vellumnus penicillatus (Gordon, 1930). A, B, Paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong; C, paratype ovigerous female (5.3 × 3.7 mm) (NHM 1030.12.2.124), Hong Kong. A, outer view of chelae; B, dorsal view of right cheliped; C, overall dorsal view.

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Figure 3.
Vellumnus penicillatus (Gordon, 1930). A, B, Holotype female (4.2 × 2.9 mm) (NHM 1930.12.2.123), Hong Kong; C-I, paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong. A, Carapace (after Gordon, 1931Gordon I 1931. Brachyura from the coasts of China. Journal of the Linnean Society, Zoology, 37(254): 525-558. https://doi.org/10.1111/j.1096-3642.1931.tb02365.x
https://doi.org/10.1111/j.1096-3642.1931... : text-fig. 18a); B, left side of denuded carapace; C, right side of denuded carapace; D, posterior margin of epistome; E, left third maxilliped (denuded); F, anterior thoracic sternum; G, pleon; H, right G1 (dorsal view); I, right G1 (ventral view); J, right G2. Scales: B-G = 0.5 mm; H-J = 0.2 mm.

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Figure 4.
Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Overall dorsal view; B, ventral view of cephalothorax

Thumbnail

Figure 5.
Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Dorsal view of carapace (right side denuded); B, outer view of left chela; C, dorsal view of left cheliped; D, left fourth ambulatory leg.

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Figure 6.
Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Right side of denuded carapace; B, front, epistome, antennule, antenna and orbit; C, left third maxilliped (denuded); D, left fourth ambulatory leg (denuded); E, anterior thoracic sternum; F, pleon; G, left G1 (ventral view); H, distal part of left G1 (ventral view); I, tip of left G1 (ventral view); J, distal part of left G1 (dorsal view); K, left G2. Scales: A-F= 1.0 mm; G, J = 0.5 mm; H, I = 0.2 mm.

Figure 1. Vellumnus penicillatus (Gordon, 1930). A, Holotype female (4.2 × 2.9 mm) (NHM 1930.12.2.123), Hong Kong; B, C, paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong. A, B, overall dorsal view; C, ventral view of cephalothorax.

Figure 2. Vellumnus penicillatus (Gordon, 1930). A, B, Paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong; C, paratype ovigerous female (5.3 × 3.7 mm) (NHM 1030.12.2.124), Hong Kong. A, outer view of chelae; B, dorsal view of right cheliped; C, overall dorsal view.

Figure 3. Vellumnus penicillatus (Gordon, 1930). A, B, Holotype female (4.2 × 2.9 mm) (NHM 1930.12.2.123), Hong Kong; C-I, paratype male (3.6 × 2.9 mm) (NHM 1930.12.2.124), Hong Kong. A, Carapace (after Gordon, 1931Gordon I 1931. Brachyura from the coasts of China. Journal of the Linnean Society, Zoology, 37(254): 525-558. https://doi.org/10.1111/j.1096-3642.1931.tb02365.x
https://doi.org/10.1111/j.1096-3642.1931... : text-fig. 18a); B, left side of denuded carapace; C, right side of denuded carapace; D, posterior margin of epistome; E, left third maxilliped (denuded); F, anterior thoracic sternum; G, pleon; H, right G1 (dorsal view); I, right G1 (ventral view); J, right G2. Scales: B-G = 0.5 mm; H-J = 0.2 mm.

Figure 4. Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Overall dorsal view; B, ventral view of cephalothorax

Figure 5. Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Dorsal view of carapace (right side denuded); B, outer view of left chela; C, dorsal view of left cheliped; D, left fourth ambulatory leg.

Figure 6. Vellumnus tki n. sp., holotype male (7.8 × 6.0 mm) (NHM 1932.7.7.22), Macclesfield Bank. A, Right side of denuded carapace; B, front, epistome, antennule, antenna and orbit; C, left third maxilliped (denuded); D, left fourth ambulatory leg (denuded); E, anterior thoracic sternum; F, pleon; G, left G1 (ventral view); H, distal part of left G1 (ventral view); I, tip of left G1 (ventral view); J, distal part of left G1 (dorsal view); K, left G2. Scales: A-F= 1.0 mm; G, J = 0.5 mm; H, I = 0.2 mm.

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Redescription of <i>Vellumnus penicillatus</i> (Gordon, 1930) from Hong Kong and description of a new species from Macclesfield Bank, South China Sea (Crustacea: Brachyura: Pilumnidae)

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[1] Corresponding Author
Paul F. Clark p.clark@nhm.ac.uk