Parasesarma leptosoma (Hilgendorf, 1869)

Li, Jheng-Jhang, Rahayu, Dwi Listyo & Ng, Peter K. L., 2018, Identity of the tree-spider crab, Parasesarma leptosoma (Hilgendorf, 1869) (Decapoda: Brachyura: Sesarmidae), with descriptions of seven new species from the Western Pacific, Zootaxa 4482 (3), pp. 451-490 : 480

publication ID	https://doi.org/ 10.11646/zootaxa.4482.3.2
publication LSID	lsid:zoobank.org:pub:3FBE11E2-9F97-4A29-92A9-67780C782E0D
DOI	https://doi.org/10.5281/zenodo.5986801
persistent identifier	https://treatment.plazi.org/id/376A1B4D-FFB9-FF9B-D1CD-FF6F41AEFC36
treatment provided by	Plazi
scientific name	Parasesarma leptosoma
status

Treatment

Key to species of the Parasesarma leptosoma View in CoL species-complex

1. Frontal margin nearly straight in dorsal view ( Fig. 2A View FIGURE 2 ); P3 and P4 relatively stout (merus length/width ratio approximately 2.4; propodus length/width ratio 4.1) ( Fig. 1E View FIGURE 1 ). (South and East Africa )..................... P. leptosoma ( Hilgendorf, 1869) View in CoL

- Frontal margin concave in dorsal view (e.g. Fig. 5A View FIGURE 5 ); P3 and P4 relatively slender (merus length/width ratio more than 2.4; propodus length/width ratio more than. 4.1) (e.g. Fig. 20A View FIGURE 20 ).................................................... 2

2. P3 and P4 very slender (merus length/width ratio 3.1; propodus length/width ratio 5.9), dactylus very short (dactylus/propodus length ratio 0.3) ( Fig. 20D View FIGURE 20 ). (Papua, Indonesia)................................................ P. gracilipes View in CoL n. sp.

- P3 and P4 broader (merus length/width ratio 2.5‾2.6; propodus length/width ratio 4.4‾4.8), dactylus relatively longer (dacty- lus/propodus length ratio c. 0.4) (e.g. Fig. 20A View FIGURE 20 ).............................................................. 3

3. G1 apical process short (e.g. Fig. 10E View FIGURE 10 )..................................................................... 4

- G1 apical process long (e.g. Fig. 5D View FIGURE 5 )...................................................................... 7

4. Coxae of P3 and P4 with dense setae ( Fig. 15E View FIGURE 15 ). (Philippines).................................... P. parvulum View in CoL n. sp.

- Coxae of P3 and P4 without dense setae (e.g. Fig. 4B View FIGURE 4 )........................................................ 5

5. Carapace 1.2 times broader than long ( Fig. 13A View FIGURE 13 ); consistently 9 tubercles on dactylus of male cheliped ( Fig. 19F View FIGURE 19 ). (Malaysia)..................................................................................... P. purpureum View in CoL n. sp.

- Carapace 1.1 times broader than long (e.g. Fig. 9A View FIGURE 9 ); 9 or 10 tubercles on dactylus of male cheliped (e.g. Fig. 20D View FIGURE 20 )........ 6

6. P3 and P4 about 1.8 times carapace width; G1 apical process slightly bent at angle of 60°, ending in truncated tip ( Fig. 2L View FIGURE 2 ). (Sulawesi, Indonesia)............................................................ P. limbense (Rathbun, 1914) View in CoL

- P2 and P3 about 1.6 times carapace width; G1 apical process bent at angle of 45°, ending in rounded tip ( Fig. 10E View FIGURE 10 ). (Taiwan) ............................................................................................ P. kui View in CoL n. sp.

7. Shape of frontal border in dorsal view distinctly concave ( Fig. 8A View FIGURE 8 ); 6–8 tubercles on dactylus of male cheliped ( Fig. 19C View FIGURE 19 ). (Taiwan and Philippines).................................................................... P. macaco View in CoL n. sp.

- Shape of frontal border in dorsal view slightly concave to straight (this state is not consistent with the couplet 1) (e.g. Fig. 5A View FIGURE 5 ); 9 or more tubercles on dactylus of male cheliped (e.g. Fig. 19B View FIGURE 19 )................................................ 8

8. Male cheliped dactylus with 9–15 ( Fig. 19B View FIGURE 19 ); P3 propodus not broader than P4 propodus ( Fig. 20A View FIGURE 20 ). ( Japan, Guam, Fiji and Vanuatu)................................................................................. P. gecko View in CoL n. sp.

- Male cheliped dactylus with 10–12 tubercles ( Fig. 19H View FIGURE 19 ); P3 propodus broader than P4 propodus ( Fig. 20G View FIGURE 20 ). (Sulawesi, Indonesia)................................................................................. P. tarantula View in CoL n. sp.