Angustopelta, Ng, Peter K. L. & Castro, Peter, 2016

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 56

Key to species of Angustopelta n. gen.

1. Anterolateral margin of adults with prominent lateral tooth ( Fig. 11 A–C). Posterolateral margins prominently diverging ( Fig. 11 A–C) [Japan; Philippines; Indonesia]............................................................. A. aurita

- Anterolateral margin of adults with low tubercle or unarmed (e.g., Fig. 13 ). Posterolateral margins gradually diverging or appearing subparallel (e.g., Fig. 13 )...................................................................... 2

2. Anterolateral margin unarmed ( Fig. 11 D–F). Distal half of G1 relatively short ( Fig. 73 F–H) [Japan, Taiwan]... A. cribrorum

- Anterolateral margin unarmed or with small tubercle (e.g., Fig. 12 A–G). Distal half of G1 relatively long (e.g., Fig. 74 A–D)..................................................................................................... 3

3. Press-button for pleonal holding present as 2 small, short tubercles posterior to thoracic sternal suture 4/5, one near edge of sterno-pleonal cavity, one just outside ( Fig. 59 J). Distal part of G1 relatively short, stout, gently curved ( Fig. 74 A–D) [Vanuatu]................................................................................... A. robusta n. sp.

- Press-button for pleonal holding as small, short tubercle posterior to thoracic sternal suture 4/5 near edge of sterno-pleonal cavity (e.g., Fig. 59 I). Distal part of G1 relatively long, slender, distinctly curved ( Fig. 74 F–H) [Solomon Islands; Fiji].............................................................................................. A. modesta n. sp.

Figures

FIGURE 11. Overall dorsal view of species of Angustopelta n. gen. A, A. aurita, Philippines: holotype female 18.9 × 19.1 mm (USNM 46405); B, A. aurita, Philippines: male 9.2 × 10.6 mm (ZRC 2015.250); C, A. aurita, Philippines: female 8.7 × 10.0 mm (ZRC 2015.253); D, A. cribrorum, Japan: holotype male 13.6 × 14.9 mm (USNM 46388); E, F, A. cribrorum, Taiwan: male 9.9 × 11.6 mm (ZRC 2015.214).

FIGURE 12. Overall dorsal view of species of Angustopelta n. gen. A, A. robusta n. sp., Vanuatu: holotype male 9.3 × 10.7 mm (MNHN-IU- 2010 - 5616); B, A. robusta n. sp., Vanuatu: paratype female 13.4 × 15.1 mm (MNHN-IU- 2010 - 5616); C, A. modesta n. sp., Solomon Islands: holotype male 13.3 × 15.1 mm (MNHU-IU- 2013 - 9038); D, A. modesta n. sp., Solomon Islands: paratype male 11.5 × 13.2 mm (MNHU-IU- 2013 - 9039); E, A. modesta n. sp., Solomon Islands: paratype female 13.1 × 15.3 mm (ZRC 2015.258); F, A. modesta n. sp., Solomon Islands: paratype male 8.7 × 9.8 mm (MNHN-IU- 2013 - 9038); G, A. modesta n. sp., Solomon Islands: paratype male 6.1 × 6.4 mm (MNHN-IU- 2013 - 9038); H, A. aff. modesta n. sp., Papua New Guinea: female 9.0 × 10.2 mm (ZRC 2015.259).

FIGURE 13. Carapace of species of Angustopelta n. gen. A, A. robusta n. sp., Vanuatu: paratype male 12.3 × 13.3 mm (ZRC 2015.255); B, A. robusta n. sp., Vanuatu: paratype female 13.4 × 15.1 mm (MNHN-IU- 2013 - 5616); C, A. robusta n. sp., Vanuatu: paratype male 12.5 × 14.8 mm (MNHN-IU- 2013 - 9041); D, A. robusta n. sp., Vanuatu: paratype male 11.0 × 12.6 mm (MNHN-IU- 2013 - 9041); E, A. robusta n. sp., Vanuatu: paratype female 9.6 × 11.0 mm (MNHN-IU- 2013 - 9041); F, A. robusta n. sp., Vanuatu: paratype female 9.9 × 11.3 mm (MNHN-IU- 2013 - 9041); G, A. modesta n. sp., Solomon Islands: holotype male 13.3 × 15.1 mm (MNHU-IU- 2013 - 9038); H, A. modesta n. sp., Solomon Islands: paratype male 11.5 × 13.2 mm (MNHU-IU- 2013 - 9039); I, A. modesta n. sp., Solomon Islands: paratype female 13.1 × 15.3 mm (ZRC 2015.258).

FIGURE 59. Thoracic sternites 7 and 8, male pleon and sterno-pleonal cavity of species of Hephthopelta and Angustopelta n. gen. A, Hephthopelta lugubris, Australia: male 7.9 × 8.3 mm (NMV J 61081); B, Hephthopelta lugubris, Solomon Is: male 8.3 × 9.1 mm (MNHN-IU- 2013 - 9040); C, Hephthopelta occidentalis n. sp., Madagascar: holotype male 6.1 × 6.6 mm with sacculinid (MNHN-IU- 2010 - 1031); D, Angustopelta aurita, Philippines: male 9.2 × 10.6 mm (ZRC 2015.250); E, Angustopelta cribrorum, Japan: holotype male 13.6 × 14.9 mm (USNM 46388); F, Angustopelta robusta n. sp., Vanuatu: holotype male 9.3 × 10.7 mm (MNHN-IU- 2010 - 5616); G, Angustopelta modesta n. sp., Solomon Islands: holotype male 13.3 × 15.1 mm (MNHU-IU- 2013 - 9038); H, Angustopelta modesta n. sp., Solomon Islands: paratype male 11.5 × 13.2 mm (MNHU- IU- 2013 - 9039); I, Angustopelta cribrorum, Taiwan: male 9.9 × 11.6 mm (ZRC 2015.214); J, Angustopelta robusta n. sp., Vanuatu: holotype male 9.3 × 10.7 mm (MNHN-IU- 2010 - 5616). Abbreviations: pb = press buttom male pleonal locking mechanism.

FIGURE 73. Gonopods of species of Angustopelta n. gen. A, A. aurita, Philippines: male 7.7 × 9.5 mm (ZRC 2015.248); B ‒ E, A. aurita, Philippines: male 9.6 × 11.2 mm (ZRC 2015.250); F ‒ H, A. cribrorum, Japan: holotype male 13.6 × 14.9 mm (USNM 46388); I, A. cribrorum, Taiwan: male 9.9 × 11.6 mm (ZRC 2015.214). A, B, F, ventral view of left G 1; C, D, G, H, distal part of left G 1; E, I, left G 2. Scales: A, B, E, F, I = 0.5 mm; C, D, G, H = 0.1 mm.

FIGURE 74. Gonopods of species of Angustopelta n. gen. A, C ‒ E, A. robusta n. sp., Vanuatu: holotype male 9.3 × 10.7 mm (MNHN-IU- 2010 - 5616); B, A. robusta n. sp., Vanuatu: paratype male 12.3 × 13.3 mm (ZRC 2015.255); F ‒ I, A. modesta n. sp., Solomon Islands: holotype male 13.3 × 15.1 mm (MNHU-IU- 2013 - 9038). A, B, F, ventral view of left G 1; C, D, G, H, distal part of left G 1; E, I, left G 2. Scales: A, B, E, F, I = 0.5 mm; C, D, G, H = 0.1 mm.