Holthuija, Ng & Forges, 2015

Ng, Peter K. L. & Forges, Bertrand Richer De, 2015, Revision of the spider crab genus Maja Lamarck, 1801 (Crustacea: Brachyura: Majoidea: Majidae), with descriptions of seven new genera and 17 new species from the Atlantic and Indo-West Pacific, Raffles Bulletin of Zoology 63, pp. 110-225 : 160

Key to species of Holthuija n. gen.

1. Carapace with 2 median gastric spines (e.g., Fig. 26A )........2

– Carapace with single median gastric spine (e.g., Fig. 26C ) ..3

2. Carapace with relatively small lateral spines, 1 cardiac spine ( Fig. 24E ); pseudorostral spines directed horizontally ( Fig. 26A ); Philippines............ Holthuija suluensis ( Rathbun, 1916)

– Carapace with relatively long lateral spines, 2 or 3 cardiac spines ( Fig. 25B–D ); pseudorostral spines gently curved downwards ( Fig. 26D ); Eastern Indian Ocean........ Holthuija aussie n. sp.

3. Carapace with relatively short lateral spines, pseudorostral spines almost straight or gently curved outward, appears level from lateral view and not prominently curved upward ( Figs. 24A–D , 25A ) ...........................................................................4

– Carapace with relatively long lateral spines, pseudorostral spines strongly curved outward and usually distinctly bent or curved upward ( Figs. 24F , 25E, F , 26B, E, F )......................5

4. Pseudorostral spines gently curved outward ( Fig. 24A–D ); G1 strongly curved with small flap distally ( Fig. 27A–C ); Singapore............................. Holthuija miersii ( Walker, 1887)

– Pseudorostral spines almost straight ( Fig. 25A ); G1 almost straight with distal part dilated ( Fig. 27I–K ); Japan................ ........................................................... Holthuija cognata n. sp.

5. Dorsal surface of carapace with low granules ( Fig. 24F ); G1 almost straight with distal part slightly dilated ( Fig. 27F–H ); Philippines, Taiwan................................ Holthuija pauli n. sp.

– Dorsal surface of carapace with distinct rounded granules ( Fig. 25E, F ); G1 curved, distal part simple ( Fig. 27L–O ); Eastern Indian Ocean......................................... Holthuija poorei n. sp.

Figures

Fig. 26. Lateral views of carapaces, Holthuija species. A, H. suluensis, holotype female (32.4 × 41.2 mm) (USNM 48224a), Philippines; B, H. pauli n. sp., holotype male (37.3 × 28.0 mm) (NMCR), Philippines; C, H. pauli n. sp., paratype male (35.0 × 27.0 mm) (ZRC 2013.1378), Philippines; D, H. aussie n. sp., holotype ovigerous female (42.1 × 34.4 mm) (NMV J63752), Arafura Sea; E, H. poorei n. sp., holotype male (24.3 × 18.7 mm) (NMV J63749), Timor Sea [laterally inverted to match earlier figures]; F, H. poorei n. sp., paratype female (27.0 × 22.5 mm) (NMV J63751), Arafura Sea laterally inverted to match earlier figures].

Fig. 24. General habitus, Holthuija species. A, Holthuija miersi (as Maia miersii, after Walker, 1887: pl. 6, fig. 1); B, H. miersi, male (32.6 × 25.6 mm) (ZRC 2000.1497), Singapore; C, H. miersii, female (16.5 × 12.2 mm) (ZRC 1995.311), Singapore; D, H. miersii, female (21.4 × 16.7 mm) (NHM 1900.10.22.13), Singapore; E, H. suluensis, holotype female (32.4 × 41.2 mm) (USNM 48224a), Philippines; F, H. pauli n. sp., holotype male (37.3 × 28.0 mm) (NMCR), Philippines.

Fig. 25. General habitus, Holthuija species. A, H. cognata n. sp., holotype male (29.5 × 23.7 mm) (CBM-ZC3662), Japan; B, H. aussie n. sp., holotype ovigerous female (42.1 × 34.4 mm) (NMV J63752), Arafura Sea; C, H. aussie n. sp., paratype juvenile female (11.9 × 9.1 mm) (NMV J53958), Australia; D, H. aussie n. sp., juvenile female (14.3 × 11.9 mm) (NMV J61058), Australia; E, H. poorei n. sp., holotype male (24.3 × 18.7 mm) (NMV J63749), Timor Sea; F, H. poorei n. sp., paratype female (27.0 × 22.5 mm) (NMV J63751), Arafura Sea.

Fig. 27. Left G1s, Holthuija species. A–C, H. miersi, male (32.6 × 25.6 mm) (ZRC 2000.1497), Singapore; D, E, H. suluensis, male (11.5 × 8.2 mm) (USNM 48507), Philippines; F–H, H. pauli n. sp., holotype male (37.3 × 28.0 mm) (NMCR), Philippines; I–K, H. cognata n. sp., holotype male (29.5 × 23.7 mm) (CBM-ZC3662), Japan; L–O, H. poorei n. sp., paratype male (26.1 × 20.1 mm) (NMV J63169), Timor Sea. Scale bars = 1.0 mm [A–F, I, L]; 0.5 mm [D, G, H, J, K, M–O]; 0.25 mm [E].