Geosesarma De Man 1892
Creators: name: Ng, Peter K. L.
name: Wowor, Daisy
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Sesarmidae
Geosesarma

description: 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
description: Published as part of Ng, Peter K. L. & Wowor, Daisy, 2019, The vampire crabs of Java, with descriptions of five new species from Mount Halimun Salak National Park, West Java, Indonesia (Crustacea: Brachyura: Sesarmidae: Geosesarma), pp. 217-246 in Raffles Bulletin of Zoology 67 on page 245, DOI: 10.26107/RBZ-2019-0018, http://zenodo.org/record/4575815