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Fig. 6 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 6. Arcotheres palaensis (Bürger, 1895). A, B, female (5.3 × 4.7 mm) (SMF-ZMG 172a) (lectotype of Pinnotheres arcophilus Bürger, 1895), Philippines; C–F, ovigerous female (5.1 × 4.3 mm) (ZRC 1999.1202), Indonesia. A, C, overall dorsal view; B, D, dorsal view of carapace; E, frontal view of cephalothorax; F, outer view of right chela.

Fig. 43 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 43. Arcotheres exiguus (Bürger, 1895), male (5.1 × 4.9 mm) (ZRC 2018.772), Peninsular Malaysia. A, overall dorsal view; B, frontal view of cephalothorax; C, outer view of right chela.

Fig. 5 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 5. Arcotheres palaensis (Bürger, 1895). A, B, lectotype female (10.2 × 8.4 mm) (SMF-ZMG 948a), Palau. A, overall dorsal view; B, ventral view of cephalothorax.

Fig. 48 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 48. Arcotheres rayi Ahyong & Ng, 2007. A, D, ovigerous female (7.6 × 5.8 mm) (ZRC 2013.1416), Peninsular Malaysia; B, C, E, female (6.2 × 4.4 mm) (ZRC 2013.1416), Peninsular Malaysia. A, B, overall dorsal view; C, dorsal view of carapace; D, E, right P5.

Fig. 44 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 44. Arcotheres exiguus (Bürger, 1895), male (5.1 × 4.9 mm) (ZRC 2018.772), Peninsular Malaysia. A, overall dorsal view; B, right MXP3; C, frontal view of cephalothorax; D, anterior thoracic sternum; E, right chela; F–I, right P2–P5; J, pleon; K, L, left G1 (ventral and dorsal views, respectively); M, N, left G2 (ventral and dorsal views, respectively). Scale = A, 2.0 mm; B, K–N, 0.5 mm; C–J, 1.0 mm.

Fig. 42 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 42. Arcotheres exiguus (Bürger, 1895). A–I, ovigerous female (8.2 × 6.9 mm) (ZRC 2021.784), India (neotype of Pinnotheres casta Antony & Kutyamma, 1971); J, K, non-ovigerous female (8.0 × 6.7 mm) (ZRC 2018.768), India; L, juvenile female (4.0 × 3.6 mm) (ZRC 2018.769), India; M, ovigerous female (4.5 × 4.0 mm) (ZRC 2018.775), Peninsular Malaysia. A, L, left MXP3 (setae omitted); B, left chela and carpus; C–F, left P2–P5, respectively (P3 carpus, propodus, and dactylus missing); G–I, right P2, P4, and P5, respectively; J, K, left and right P4, respectively; M, distal part of right P5 dactylus (ventral view, soft setae omitted). Scales = A–L, 0.5 mm; M, 0.25 mm.

Fig. 22 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 22. Arcotheres palaensis (Bürger, 1895). A–N, male (3.6 × 3.6 mm) (ZRC 2019.1788), Indonesia; O, male (2.8 × 2.5 mm) (SMFZMG 172b) (paralectotype of Pinnotheres arcophilus Bürger, 1895), Philippines. A, left MXP3; B–E, left P2–P5, respectively; F–I, right P2–P5, respectively; J, pleon; K, left G1 (ventral view); L, M, left G1 (slightly different dorsal views); N, left G2; O, pleonal somites 3–5, telson, and left G1. Scales = A, K–N, 0.2 mm; B–J, 0.5 mm; O, 0.1 mm.

Fig. 38 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 38. Arcotheres exiguus (Bürger, 1895). A, C–E, ovigerous female (7.7 × 6.7 mm) (ZRC 2018.772), Peninsular Malaysia; B, female (8.2 × 7.4 mm) (ZRC 2018.775), Peninsular Malaysia. A, B, overall dorsal view; C, frontal view of cephalothorax; D, outer view of right chela; E, outer view of fingers of left chela.

Fig. 39 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 39. Arcotheres exiguus (Bürger, 1895). A–C, ovigerous female (8.2 × 6.9 mm) (ZRC 2021.784), India (neotype of Pinnotheres casta Antony & Kutyamma, 1971); D, non-ovigerous female (8.0 × 6.7 mm) (ZRC 2017.1037), India; E, juvenile female (4.0 × 3.6 mm) (ZRC 2018.769), India. A, D, E, overall dorsal view; B, ventral view of cephalothorax; C, frontal view of cephalothorax.

Fig. 30 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 30. Arcotheres similis (Bürger, 1895). A–K, ovigerous female (9.3 × 7.8 mm) (ZRC 2017.1034), Singapore; L, ovigerous female (6.7 × 5.5 mm) (NHM 1936.6.19.2), Singapore (holotype of Pinnotheres spinidactylus Gordon, 1936). A–D, left P2–P5, respectively; D', distal part of dactylus of left P5 showing stiff subdistal spinules (subventral view, soft setae omitted); E–H, right P2–P5, respectively; H', L, distal part of dactylus of right P5 showing stiff subdistal spinules (subventral view, soft setae omitted); I, outer view of left chela and carpus; J, outer view of left MXP3 (setae omitted); K, posterior margin of epistome. Scales = A–H, I, 1.0 mm; J, K, 0.5 mm; D', H' = 0.25 mm; L = 0.10 mm.

Fig. 34 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 34. Arcotheres exiguus (Bürger, 1895), colour in life and in situ in Marcia recens (Holten, 1802) (Veneridae), Peninsular Malaysia. A, male (4.3 × 4.2 mm) and ovigerous female (6.3 × 5.4 mm) (ZRC 2018.772) (placed together for photograph but originating from different shells); B, C, ovigerous female (6.3 × 5.4 mm) (ZRC 2018.772); D–F, male (4.3 × 4.2 mm) (ZRC 2018.772). Photographs: Paul Y. C. Ng.

Fig. 2 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 2. Arcotheres palaensis (Bürger, 1895), colour in life, in situ in Anadara and Tegillarca (Arcidae). A, ovigerous female (13.3 × 11.2 mm) (ZRC 2017.1281), Peninsular Malaysia; B, ovigerous female (8.7 × 8.0 mm) (ZRC 2020.1), Peninsular Malaysia; C, D, ovigerous female (11.6 × 10.3 mm) (ZRC 2020.11), Peninsular Malaysia; E, F, female (7.9 × 6.6 mm) (ZRC 2018.255), Peninsular Malaysia. A, D, E, in situ; B, dorsal view; C, ventral view. A, host A. cf. rhombea (Born, 1778); B–F, host T. granosa (Linnaeus, 1758). Photographs: Paul Y. C. Ng.

Fig. 3 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 3. Arcotheres palaensis (Bürger, 1895), colour in life, overall dorsal view. A, ovigerous female (8.7 × 8.0 mm) (ZRC 2020.1), Peninsular Malaysia; B, female (9.5 × 8.2 mm) (ZRC 2020.1), Peninsular Malaysia; C, female (9.3 × 8.3 mm) (ZRC 2020.1), Peninsular Malaysia; D, ovigerous female (11.6 × 10.3 mm) (ZRC 2020.11), Peninsular Malaysia; E, female (6.3 × 5.0 mm) (ZRC 2021.821), Peninsular Malaysia; F, ovigerous female (7.9 × 6.4 mm) (ZRC 2021.821), Peninsular Malaysia; G, female (6.4 × 4.8 mm) (ZRC 2021.821), Peninsular Malaysia; H, female (7.8 × 6.6 mm) (ZRC 2021.0801), Peninsular Malaysia. Photographs: Paul Y. C. Ng, P. K. L. Ng.

Fig. 4 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 4. Arcotheres palaensis (Bürger, 1895), ovigerous female (11.6 × 10.3 mm) (ZRC 2020.11), Peninsular Malaysia, colour in life. Two subventral views showing eyes, antennules, antennae, and MXP3.

Fig. 1 in The pea crab genus Arcotheres Manning, 1993 (Crustacea: Brachyura: Pinnotheridae) from Singapore and Peninsular Malaysia, with a reappraisal of diagnostic characters and descriptions of two new genera

Fig. 1. Original figures of selected species. A, A. palaensis (Bürger, 1895), after Bürger (1895: pl. 9 fig. 12); B, A. guinotae Campos, 2001, after Campos (2001: fig. 1A); C, A. arcophilus (Bürger, 1895), after Bürger (1895: pl. 9 fig. 10); D, A. modiolicola (Bürger, 1895), after Bürger (1895: pl. 9 fig. 9); E, Pl. coarctatus (Bürger, 1895), after Bürger (1895: pl. 9 fig. 7); F, M. latus (Bürger, 1895), after Bürger (1895: pl. 9 fig. 16).

Fig. 20. Engkaria eubranchus, ZRC 60468, 36.8 in Hypergastromyzon revisited, with descriptions of a new genus and two new species (Teleostei: Gastromyzontidae)

Fig. 20. Engkaria eubranchus, ZRC 60468, 36.8 mm SL; ventral view of fused pelvic fins, showing posterior half of last rays free; with view of anal pore.

Fig. 24. X in Hypergastromyzon revisited, with descriptions of a new genus and two new species (Teleostei: Gastromyzontidae)

Fig. 24. X-ray images of lateral views showing presence of bifurcated first anal-fin pterygiophore in latter three species (pin used to prop specimen up). Top to bottom: Hypergastromyzon humilis, CMK 10574, 31.5 mm SL; Engkaria eubranchus, ZRC 60468, 38.0 mm SL; Gastromyzon ctenocephalus, ZRC 47031, 39.8 mm SL; and Neogastromyzon chini, ZRC 59951, 37.8 mm SL.

Fig. 17. Engkaria eubranchus, ZRC 60468, 40.1 in Hypergastromyzon revisited, with descriptions of a new genus and two new species (Teleostei: Gastromyzontidae)

Fig. 17. Engkaria eubranchus, ZRC 60468, 40.1 mm SL, female; composite of dorsal, lateral, and ventral views. Note abrasion marks on dorsal surface due to artefact from collection.

Fig. 12. Hypergastromyzon sambas, MZB 17235, 32.4 in Hypergastromyzon revisited, with descriptions of a new genus and two new species (Teleostei: Gastromyzontidae)

Fig. 12. Hypergastromyzon sambas, MZB 17235, 32.4 mm SL, holotype, female (?); composite of dorsal, lateral, and ventral views.

Fig. 23. X in Hypergastromyzon revisited, with descriptions of a new genus and two new species (Teleostei: Gastromyzontidae)

Fig. 23. X-ray images of posterior bodies, showing absence of V-shape pterygiophore of first anal fin ray vs. presence. Top: Hypergastromyzon humilis, CMK 10574, 31.5 mm SL; bottom: Engakaria eubranchus, ZRC 60468, 38.0 mm SL.