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FIGURE 4. Megaesthesius sagedae Rathbun, 1909. A in A new species of Megaesthesius Rathbun, 1909 (Crustacea: Brachyura: Chasmocarcinidae) from deep water off Western Australia

FIGURE 4. Megaesthesius sagedae Rathbun, 1909. A, female in dorsal view (Serène 1964); B, holotype male in dorsal view (Rathbun 1910); C, male (2.3×3.4 mm) from Madagascar in dorsal view (Crosnier 1975); D, detail of front, orbits, antennules and antennae of female (2.6×3.5 mm) (Crosnier 1975); E, orbital region; F, left chela (Crosnier 1975); G, third maxilliped (Crosnier 1975); H, third maxilliped (Serène 1964); I, right second walking leg (P3)(Crosnier 1975), note that it has been flipped to aid easier comparison; J, left second walking leg (P3) (Serène 1964); K, detail of propodus and dactylus, with magnified view of mobile spinules on dactylus (Serène 1964).

FIGURE 3 in A new species of Megaesthesius Rathbun, 1909 (Crustacea: Brachyura: Chasmocarcinidae) from deep water off Western Australia

FIGURE 3. Male gonopods and abdomens for the three known species of Megaesthesius. A–E, M. westralia sp. nov.: A, left G1 in sternal view; B, left G1 in abdominal view; C, left G1, detail of tip; D, left G2; E, male abdomen with lateral view of sternites 7–8 and penis. F–I, M. yokoyai Sakai, 1939: F, left G1 in abdominal view; G, H. distal part of G1 in abdominal and sternal view; I, male abdomen (somites 1–2 not shown) (After Takeda & Miyake, 1972). J–N, M. sagedae Rathbun, 1909: J, left G1, abdominal face; K, detail of tip; L, left G1 sternal face; M, left G2 abdominal face; N, male abdomen (after Crosnier 1975).

FIGURE 5. Megaesthesius yokoyai Sakai, 1939. A in A new species of Megaesthesius Rathbun, 1909 (Crustacea: Brachyura: Chasmocarcinidae) from deep water off Western Australia

FIGURE 5. Megaesthesius yokoyai Sakai, 1939. A, dorsal view (Yokoya 1933); B, left third walking leg of male (P4); C, carapace with right cheliped of male (C1, left lateral border of carapace of male; C2, right lateral border of male; C3, right lateral border of female); D, right half of carapace of female in frontal view; E, left orbital region of male in frontal view; F, left chela of male; G, third maxilliped. (Figs B–G after Takeda & Miyake, 1972).

FIGURE 1 in A new species of Megaesthesius Rathbun, 1909 (Crustacea: Brachyura: Chasmocarcinidae) from deep water off Western Australia

FIGURE 1. Megaesthesius westralia sp. nov., holotype male. A, carapace in dorsal view; B, fronto-ventral view showing third maxilliped and buccal frame; C, latero-ventral view; D, frontal view.

FIGURE 2 in A new species of Megaesthesius Rathbun, 1909 (Crustacea: Brachyura: Chasmocarcinidae) from deep water off Western Australia

FIGURE 2. Megaesthesius westralia sp. nov., holotype male. A, anterodorsal view of frontal and orbital regions; B, ventral view of infraorbital margin showing eyestalk; C, third maxilliped; D, fourth pereiopod; E, fifth pereiopod.

FIGURE 103 Megaesthesius migmus n in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 103 Megaesthesius migmus n. sp. A, Philippines: holotype male 4.4 × 4.9 mm (NMCR); B–D, Philippines: paratype female 4.6 × 5.2 mm (ZRC 2015.243). [P.K.L. Ng]

FIGURE 100. Chasmocarcinus and Camatopsis. A, B in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 100. Chasmocarcinus and Camatopsis. A, B, Chasmocarcinus longipes, Taboga, Panama: male (not examined) [A. Anker]; C, Camatopsis africana n. sp., Madagascar: paratype female 8.3 × 9.8 mm (MNHN-IU-2008-10286) [T.-Y. Chan]; D, Camatopsis africana n. sp., Madagascar: paratype female 5.6 × 6.2 mm (MNHN-IU-2008-10287) [T.-Y. Chan]; E, Camatopsis leptomerus n. sp., Philippines: male 5.2 × 4.5 mm (ZRC 2015.129) [P.K.L. Ng]; F, Camatopsis leptomerus n. sp., Vanuatu: female 7.2 × 7.9 mm (ZRC 2015.173) [J.C. Mendoza]; G, Camatopsis leptomerus n. sp., Vanuatu: female 9.5 × 10.1 mm (ZRC 2015.168) [T.-Y. Chan]; H, Camatopsis thula n. sp., Taiwan: paratype male 10.2 × 11.1 mm (ZRC 2001.2215) [T.-Y. Chan].

FIGURE 101. Angustopelta n. gen. A in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 101. Angustopelta n. gen. A, Angustopelta aurita, Philippines: female 11.8 × 10.2 mm (ZRC 2015.249) [P.K.L. Ng]; B, Angustopelta aurita, Philippines: female 11.8 × 10.4 mm (ZRC 2015.249) [P.K.L. Ng]; C, Angustopelta aurita, Philippines: male 7.7 × 9.5 mm (ZRC 2015.248) [T.-Y. Chan]; D, Angustopelta aurita, Philippines: female 10.9 × 12.7 mm (ZRC 2015.248) [T.-Y. Chan]; E, Angustopelta criborum, Taiwan: male 9.9 × 11.6 mm (ZRC 2015.214) [T.-Y. Chan]; F, Angustopelta robusta n. sp., Vanuatu: paratype male 8.7 × 9.1 mm (ZRC 2015.256) [T.-Y. Chan].

FIGURE 102. Tenagopelta pacifica n in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 102. Tenagopelta pacifica n. sp., Philippines. A, B, male 11.8 × 13.7 mm (ZRC 2015.189) [P.K.L. Ng]; C, male 9.1 × 9.6 mm (ZRC 2015.190) [T.-Y. Chan]; D, paratype female 8.4 × 9.7 mm (ZRC 2015.201) [T.-Y. Chan]; E, young female 6.9 × 7.7 mm (ZRC 2015.198) [T.-Y. Chan]; F, paratype female 6.6 × 6.9 mm (ZRC 2015.200) [T.-Y. Chan].

FIGURE 99 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 99. Female pleon and vulvae of species of Australocarcinus and Trogloplax. A, B, Australocarcinus riparius, Australia: female 9.0 × 11.3 mm (ZRC 2006.167); C, D, Australocarcinus kanaka, New Caledonia: female 8.5 × 9.8 mm (ZRC 2009.111); E, F, Australocarcinus palauensis, Palau: holotype female (5.8 × 7.1 mm) (USNM 277853); G, H, Trogloplax joliveti, New Britain: female 14.1 × 16.8 mm (ZRC 2015.295). A, C, E, G, thoracic sternum with pleon; B, D, F, H, female sterno-pleonal cavity with vulvae.

FIGURE 92 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 92. Vulvae of species of Microtopsis and Megaesthesius. A, Microtopsis takedai, Japan: paratype female 3.6 × 2.7 mm (ZRC 2012.0146); B, Megaesthesius sagedae, Singapore: female carapace length 2.9 mm, sides damaged (ZRC 1995.883); C, Megaesthesius migmus n. sp., Philippines: paratype female 3.9 × 4.5 mm (ZRC 2015.245); D, Alainthesius bertrandi n. sp., Papua New Guinea: female 5.6 × 6.9 mm (MNHN-IU-2013-9012).

FIGURE 68 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 68. Gonopods and third maxilliped of Camatopsis leptomerus. A, Philippines: paratype male 4.7 × 5.9 mm (ZRC 2015.120); B‒D, Indonesia: male 2.5 × 3.9 mm (NNM-ZMA 241605e), E, Philippines: paratype female 3.4 × 4.0 mm (ZRC 2015.159); F, Philippines: paratype male 3.1 × 3.4 mm (ZRC 2015.120); G, Philippines: paratype female 4.8 × 5.8 mm (ZRC 2015.154); H, Philippines: male 4.7 × 5.9 mm (ZRC 2015.120). A, B, ventral view of left G1; D, dorsal view of left G1; C, ventral view of distal part of left G1; E, right third maxilliped (denuded); F‒H, left third maxilliped (denuded). Scales: A, B, D = 0.25 mm; E‒H = 0.5 mm; C = 0.01 mm.

FIGURE 74 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

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 G1; C, D, G, H, distal part of left G1; E, I, left G2. Scales: A, B, E, F, I = 0.5 mm; C, D, G, H = 0.1 mm.

FIGURE 71 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 71. Gonopods of Hephthopelta lugubris. A‒E, Australia: male 7.9 × 8.3 mm (NMV J61081); F‒I, Solomon Is: male 8.3 × 9.1 mm (MNHN-IU-2013-9040); J, Solomon Is: male 7.3 × 7.8 mm (MNHN-IU-2013-9037); K‒M, Fiji: male 6.3 × 6.5 mm (MNHN-IU-2013-9028). A, B, F, J, K, ventral view of left G1; C, H, ventral view of distal part of left G1; D, I, dorsal view of distal part of left G1; E, M, left G2; G, L, dorsal view of left G1. Scales: A, B, E, F, G, J‒M = 0.5 mm; C, D, H, I = 0.1 mm.

FIGURE 69 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 69. Thoracic sternum, third maxilliped, pleon and gonopods of Camatopsis species. A, B, D‒F, C. minor n. sp., Indonesia: holotype male 3.6 × 4.3 mm (NNM-ZMA); C, C. minor n. sp., Indonesia: paratype male 3.4 × 4.0 mm (NNM- ZMA); G‒K, C. valida n. sp., Fiji: holotype male 3.6 × 4.9 mm (MNHN-IU-2013-9067). A, anterior thoracic sternum; B, male pleon; C, D, H, I, ventral view of left G1; E, J, dorsal view of left G1; F, K, left G2; G, left third maxilliped (setae not drawn). Scales: A, B, G = 0.5 mm; C–F = 0.25 mm; H–K = 0.1 mm.

FIGURE 84 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 84. Female thoracic sternum and pleon of species of Chasmocarcinus. A, C. typicus, Trinidad: paratype female 6.5 × 6.8 mm (USNM 6901); B, C. arcuatus, Brazil: female 4.4 × 6.2 mm (ZRC 2015.222); C, C. chacei, Gulf of Mexico: female 7.8 × 9.5 mm (USNM 61489); D, C. cylindricus, Puerto Rico: female 6.9 × 9.2 mm (USNM 24551); E, C. latipes, Mexico: neotype female 12.4 × 14.4 mm (USNM 21592); F, C. latipes, Mexico: female 9.2 × 13.0 mm (AMNH 16262, holotype female of Chasmocarcinus ferrugineus Glassell, 1936).

FIGURE 77 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 77. Gonopods of species of Statommatia n. gen. A‒D, S. apta, Philippines: male 5.9 × 7.1 mm (ZRC 2015.239); E‒H, S. knudseni, New Caledonia: holotype male 4.7 × 6.9 mm (ZMUC CRU-6974); I‒L, S. malagasy n. sp., Madagascar: holotype male 9.9 × 12.4 mm (MNHN-IU-2010-4370a). A‒C, ventral view of right G1 [left one damaged]; E, I, ventral view of left G1; B, dorsal view of distal part of right G1; C, ventral view of distal part of right G1; F, J, ventral view of distal part of left G1; G, K, dorsal view of distal part of left G1; D, H, L, left G2. Scales: A, D, E, H, I, L = 0.5 mm; B, C, F, G, J, K = 0.1 mm.

FIGURE 83 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 83. Gonopods of species of Alainthesius n. gen. A‒C, A. signatus n. sp., Madagascar: holotype male 2.5 × 3.3 mm (MNHN-IU-2013-9472) (after Crosnier 1975: fig. 1f‒h); D‒H, A. bertrandi n. sp., New Caledonia: holotype male 3.3 × 4.1 mm (MNHN-IU-2013-9073). A, ventral view of right G1; D, ventral view of left G1; B, dorsal view of right G1; E, G, dorsal view of distal part of left G1; F, ventral view of distal part of left G1; C, right G2; H, left G2. Scales = 0.1 mm.

FIGURE 95 in Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea)

FIGURE 95. Chelae of species of Australocarcinus and Trogloplax. A, B, Australocarcinus riparius, Australia: male 8.8 × 10.2 mm (ZRC 2006.167); C, D, Australocarcinus kanaka, New Caledonia: female 8.5 × 9.8 mm (ZRC 2009.111); E, F, Australocarcinus palauensis, Palau: holotype female (5.8 × 7.1 mm) (USNM 277853); G, H, Trogloplax joliveti, New Britain: male 15.7 × 18.6 mm (ZRC 2015.294).