The vampire crabs of Java, with descriptions of five new species from Mount Halimun Salak National Park, West Java, Indonesia (Crustacea: Brachyura: Sesarmidae: Geosesarma) Author Ng, Peter K. L. Author Wowor, Daisy text Raffles Bulletin of Zoology 2019 2019-04-03 67 217 246 journal article 10.26107/RBZ-2019-0018 2345-7600 4575815 0656D7C5-0498-40B6-9348-284800EE671D Key to Species of Javan Geosesarma 1. Dorsal margin of dactylus of male chela with 3 or 4 tubercles; G1 relatively stout...................................................................2 – Dorsal margin of dactylus of male chela with more than 5 tubercles; G1 relatively slender ..............................................3 2. Male pleon with somite 6 trapezoidal ( Fig. 11D, E ); G1 proportionately very stout, wide, chitinous part very short, bent about 45° along longitudinal axis ( Fig. 12 B–F) [Bogor Regency, West Java ]....................... G. robustum , new species – Male pleon with somite 6 subrectangular ( Fig. 8D, E ); G1 proportionately less stout, more narrow, chitinous distal part relatively elongate, bent about 80° along longitudinal axis ( Fig. 10 B–D) [Sukabumi Regency, West Java ] ................................ ........................................................ G. sukabumi , new species 3. Dorsal margin of dactylus of male chela with 6 or 7 large tubercles ( Fig. 22 F–H); G1 very short, stout with short, rounded chitinous distal part ( Fig. 23 B–F) [Malang Regency, East Java ] ................................................. G. rouxi ( Serène, 1968a ) – Dorsal margin of dactylus of male chela with 7–19 small tubercles along almost entire length; G1 slender, chitinous distal part long, slender to spatulate.......................................4 4. Dorsal margin of dactylus of male chela with 7–13 small tubercles (including small one near tip) along almost entire length; species living from lowlands to about 700 m asl......5 – Dorsal margin of dactylus of male chela with 15–19 small tubercles (including small one near tip) along almost entire length; montane species, from 900 m asl and above.............9 5. Carapace in life distinctly with anterior and posterior halves differently coloured .................................................................6 – In life, carapace evenly coloured grey, brown, orange or purple, the anterior and posterior halves not distinctly separated......7 6. Anterior half of carapace purple to purplish-brown, posterior half cream to yellowish-white ( Ng et al., 2015 : fig. 6A–C); dorsal margin of dactylus of male chela with 7–9 small tubercles ( Ng et al., 2015 : fig. 5D) [Cilacap Regency, Central Java ]............ ........................... G. dennerle Ng, Schubart & Lukhaup, 2015 – Anterior half of carapace bright purple on anterior half, posterior half bluish-grey ( Ng & Davie, 1995: 32 ); dorsal margin of dactylus of male chela with 10 or 11 small tubercles ( Ng & Davie, 1995 : fig. 2D, E; Ng et al., 2015 : fig. 5C) [Ujung Kulon, Lebak Regency, Banten ] ......... G. bicolor Ng & Davie, 1995 7. Carapace evenly orange throughout in life ( Ng et al., 2015 : fig. 6D–F); dorsal margin of dactylus of male chela with with 7–9 small tubercles ( Ng et al., 2015 : figs. 5E) [Cilacap Regency, Central Java ].......... G. hagen Ng, Schubart & Lukhaup, 2015 – Carapace otherwise coloured in life; dorsal margin of dactylus of male chela with 11–13 or small tubercles (last one often very small) ..............................................................................8 8. Male pleon proportionately broader ( Fig. 1D ); G1 more slender with subdistal part of outer margin more rounded, curved, dorsal section proportionately more slender; chitinous distal part bent 40° along longitudinal axis ( Figs. 4D, E, H, I , 6 D–F) [Bogor and Lebak Regencies; West Java and Banten ] ........................ .............................................. G. noduliferum ( De Man, 1892 ) – Male pleon proportionately more slender ( Fig. 5D ); G1 relatively stouter, subdistal part of outer margin more angular, dorsal distal section more strongly developed, chitinous distal part bent 45° along longitudinal axis ( Figs. 6G, H , 7B, C ) [Lebak Regency; Banten ].................................. G. lebak , new species 9. Ambulatory meri proportionately longer and more slender ( Fig. 16A ); G1 with chitinous part relatively longer, gently bent 30° along longitudinal axis ( Fig. 18B, C, H, I ) [Bogor and Sukabumi Regencies; West Java ]...................................... ............................................................... G. sekop , new species – Ambulatory meri proportionately shorter and stouter; G1 with chitinous part relatively shorter, bent 40° along longitudinal axis.........................................................................................10 10. Margin of frontal lobe distinctly convex ( Fig. 13B ); G1 proportionately stouter, chitinous distal part wider in mesial view ( Fig. 15B, C ) [Cibodas, Cianjur Regency, West Java ]... ................................................. G. confertum ( Ortmann, 1894 ) – Margin of frontal lobe gently convex to almost truncate ( Figs. 19B , 20A ); G1 relatively more slender, chitinous distal part more slender in mesial view ( Fig. 21B, C ) [ Mount Halimun , Bogor Regency, West Java ].............. G. cikaniki , new species