Laomenes A.H. Clark

Marin, Ivan, 2009, Crinoid-associated shrimps of the genus Laomenes A. H. Clark, 1919 (Caridea: Palaemonidae: Pontoniinae): new species and probable diversity, Zootaxa 1971, pp. 1-49 : 46-47

Key to the species of the crinoid associated genus Laomenes A.H. Clark :

1. Ventral rostral teeth present. Pereiopod III propodus with distoventral spines............................................2

- Ventral rostral teeth absent. Pereiopod III propodus without distoventral spines........................................5

2. Dactylus of ambulatory pereiopods with accessory tooth perpendicular to basal part................................3

- Dactylus of ambulatory pereiopods with accessory tooth turned forward...................................................4

3. Eyestalk about 1.7 times as long as wide. Pereiopod II with fingers slender, about 4 times longer than wide; palm is about 1.5 times longer than finger; pereiopods II (chelipeds) similar in males....................... .............................................................................................................................. L. amboinensis ( De Man)

- Eyestalk as long as wide. Pereiopod II with fingers stout, about 2.5 times as long as wide; palm just twice longer than fingers; pereiopods II (chelipeds) clearly dissimilar in males ............ L. cornutus (Borradaile)

4. Fingers of pereiopod II slender, more than 5 times longer than wide. Tooth on basal antennal segment small, equal or shorter than the length of the segment ..................................................... L. pardus sp. nov.

- Fingers of pereiopod II less than 4 times longer than wide. Tooth on basal antennal segment large, about 1.5 times longer than the length of the segment ............................................................... L. clarki sp. nov.

5. Rostrum with more than 3 dorsal teeth situated along the length of the dorsal carina ....... L. tigris sp. nov.

- Rostrum toothless or with teeth situated only at distal part of dorsal carina................................................6

6. Rostrum thin, sickle-like, turned down, with small teeth in it distal part. Apical papilla of eyes strongly produced, sharp ........................................................................................................... L. jackhintoni (Bruce) (known only from Tonga, in association with unidentified orange crinoid)

- Rostrum normal, wide, not sickle-like, turned forward. Apical papilla of eyes not as produced, blunt ..... 7

7. Rostrum with 3 or 4 dorsal teeth situated at distal third of dorsal carina. L. ceratophthalmus (Borradaile)

- Rostrum toothless ...................................................................................................... L. nudirostris (Bruce)