Urocaridella Borradaile, 1915

Paramasivam, Purushothaman, Madhavan, Manu, Ajith Kumar, T. T. & Lal, Kuldeep Ku- Mar, 2022, New record of Urocaridella antonbruunii (Bruce, 1967) from Southern India with taxonomic Keys of Urocaridella Borradaile, 1915 (Decapoda; Palaemonidae), Zootaxa 5138 (5), pp. 563-574 : 571-572

Updated Keys to the members of Urocaridella Borradaile, 1915

1 Rostrum with more than 6 teeth dorsally; telson ending narrow triangular structure in posteriorly; mandible with well-developed two-segmented palp; first pereiopod with chela>2.0 times as long as carpus, fingers longer than the palm length; second pereiopod with the length of palm longer than carpus, fingers markedly longer than palm; propodus of third to fifth pereiopods less than four times as long as dactylus......................................................... U. urocaridella

— Rostrum with less than or 6 teeth dorsally; telson ending simple triangular form without narrow structure in posteriorly; mandible without palp or a vestige of pale; first pereiopod with chela shorter than carpus, the length of fingers subequal or equal to palm length; second pereiopod with palm length not longer than carpus, the length of fingers less than or sub-equal to palm; propodus of third to fifth pereiopods more than four times of dactylus............................................ 2

2. Third abdominal somite produced posteriorly with a big triangular cap structure overhanging on 4 th abdominal somite; distal end of telson with two pairs of spines................................................................. U. liui

— Third abdominal somite produced posteriorly with expanded or sub-rectangular dorsal margin, not overhanging posterior part of the somite; distal end of telson with three pairs of spines.................................................... 3

3. Branchiostegal spine removed from the margin by not more than the length of spine; fifth abdominal somite strongly acute posteroventrally; mandible with a vestige of pale; third to fifth pereiopods with propodus less than 3 ventral spines and one pair of distal spines.............................................................................. U. vestigialis

— Branchiostegal spine removed from the margin by more than the length of spine; fifth abdominal somite rounded posterventrally; mandible without palp; third to fifth pereiopods with propodus greater than 3 ventral spines and one pair of distal spines.............................................................................................. 4

4. Third abdominal somite with hump posterior to mid-length and making pleon gibbous...................... U. degravei

— Third abdominal somite with rounded ridge medially or with nearly expanded or sub-rectangular posterodorsally......... 5

5. Third abdominal somite nearly subrectangular dorsal profile in posteriorly and compressed laterally; dactylus of third to fifth pereiopods are biunguiculate................................................................ U. antonbruunii

— Third abdominal somite with rounded ridge medially or with nearly expanded, not compressed laterally; dactylus of third to fifth pereiopods are not biunguiculate..................................................................... 6

6. Sixth abdominal somite greater than 2.0 times as long as the fifth somite; third to fifth pereiopods with propodus more than 7 ventral spines and propodus greater than 7 times as long as dactylus................................. U. arabianensis

— Sixth abdominal somite less than 2.0 times as long as the fifth somite; third to fifth pereiopods with propodus lesser than 7 ventral spines and propodus lesser than 7 times as long as dactylus.............................................. 7

7. Third abdominal somite with prominent, rounded ridge medially, subrectangular in profile; carpus second pereiopod 1.5 times as long as palm.............................................................................. U. pulchella

— Third abdominal somite more or less expanded and rounded posterodorsally; carpus of second pereiopod equal to palm length....................................................................................... U. cyrtorhyncha