1.1 First two pairs of pereiopods identical 2 (Atya group)

1.2 First pair distinctly shorter than second 3

2.1 Carapace withanacuteprojection onthepterygostomian margin, Atyopsisspinipes rostrum with more than two teeth on the ventral margin

2.2 Carapacewithroundedpterygostomianmargin, rostrumwith Atyoidapilipes fewer than two teeth on the ventral margin

3.1 More than six post-orbital teeth situated on the dorsal margin of the rostrum. Along stylocerite, reaching at least to the 4 (C. serratirostris group) beginning of the second segment of the antennular peduncle

3.2 Fewerthansixdorsalrostrumteethsituatedonthe carapace 5 behind the orbital margin. Along or short stylocerite

4.1 Rostrumwith 22–26 dorsalteethand P2 carpus 8.2–10.9 timesas Caridinaserratirostris long as it is wide

4.2 Rostrumwith 17–22 dorsalteethand P2 carpus 11.9–12.0 timesas C. celebensis long as it is wide.

5.1 Numberof spiniformsetaeontheuropodaldiaeresis 6–10 anda C. leptopoda sp. nov. very long and upcurved rostrum with 5–9 dorsal teeth, widely spaced

5.2 Numberof spiniformsetaeontheuropodaldiaeresis 8–22 anda 6 long or short rostrumwith 8–28 dorsal teeth, closely set

6.1 Uropodaldiaeresiswith 14–22 spinules, short rostrum, armedor 7 not, and high unarmed pre-anal carina

6.2 Uropodaldiaeresiswith 8–17 spinules, rostrumvariable inshape 13 and length, and low pre-anal carina with or without a spine

7.1 Telson with numerous and very long plumose intermediate setae 8 (C. weberi group)

7.2 Telson with few long intermediate setae 11 (C. typus group)

8.1 Rostrum without dorsal teeth Atydina atyoides

8.2 Teeth present on the dorsal margin of the rostrum 9

9.1 Rostrum straight, 9–17 teeth on the dorsal margin C. laoagensis

9.2 Rostrum bent downwards, 8–10 teeth on the dorsal margin 10

10.1 Outerterminalprojectionof uropodaldiaeresisshorterthanthe C. parvirostris first movable spine

10.2 Outerterminalprojectionof uropodaldiaeresislongerthanthe C. papuana first movable spine

11.1 Rostrum reaching to or longer than the antennular peduncle C. villadolidi

11.2 Rostrum shorter than the antennular peduncle 12

12.1 Rostrumreachingtheendof the secondsegmentof the C. typus antennular peduncle

12.2 Rostrumreachingtheendof the firstsegmentof the antennular C. zhujiangensis peduncle

13.1 Nosubapicalteethonthe rostrum, tipof therostrum rounded, 14 (C. brevicarpalis group) and P1 carpus deeply excavated

13.2 Subapicalteeth oftenpresentontherostrumandtip of the 15 rostrum pointed P1 carpus not deeply excavated

14.1 Rostrum overreaching the scaphocerite C. endehensis

14.2 Rostrum reaching the end of the antennular peduncle C. brevicarpalis

15.1 Presence of oneor fewsubapicalteethonthe rostrum, fewer 16 (C. nilotica group) than two post-orbital teeth

15.2 Nosubapicalteethonthe rostrum, morethanthreepost-C. bruneiana orbital teeth

16.1 Distinct projection on the pre-anal carina C. gracilipes

16.2 Absence of projection, sometimesthepresenceof acluster C. elongapoda of setae

3.3. Taxonomy: Updated Checklist of the Species of Atyid Shrimps from Mindoro Island