Laomenes amboinensis

Bruce, A. J., 2014, Laomenes albonigrus sp. nov., (Crustacea: Decapoda; Pontoniinae) from Ashmore Reef, Western Australia, Zootaxa 3846 (3), pp. 439-446 : 445

Key to the species of the Laomenes amboinensis species group

1. Cornea globular....................................................................................... 2

– Cornea papillate....................................................................................... 3

2. Rostral dentition 4(+1)/1 hepatic tooth larger than antennal tooth, second pereiopods subequal, similar, major chela about 0.66 of palm length, feebly dentate, third pereiopod dactyl with unguis 0.59 of corpus length, accessory tooth anteroverted, preterminal, 0.18 of unguis length, ventral corpus sinuous, propod distoventral spines shorter, two very small ventral spines, dorsal telson spines minute, about 0.025 of telson length, at 0.54 and 0.76 of telson length....................................................................................................... L. gyrophthalmus Marin, Chan & Okuno.

– Rostral dentition 5/2, antennal and hepatic teeth subequal, second pereiopods unequal, minor chela half length of major chela, major chela with fingers 0.33 of palm length, strongly dentate, minor chela fingers 0.7 of palm length, feebly dentate, third pereiopod dactyl with unguis 0.7 of corpus length, accessory tooth small, sub-erect, terminal, 0.1 of unguis length, ventral corpus near straight, third pereiopod propod distoventral spines longer, with seven small ventral spines, telson dorsal spines normal for genus, sub-marginal, projecting over edge of telson, about 0.06 of telson length............. L. albonigrus sp. nov.

3. Robust shrimp, eyestalk short and stout, second pereiopods stout................................................ 4

– Slender shrimp, eyestalk elongate, second pereiopods slender................................................... 5

4. Eyestalk longer, length about 2.6 times width, second pereiopods equal, with longer fingers..... L. holthuisi Marin & Okuno

– Eyestalk shorter, length about 1.6 times width, second pereiopods with shorter fingers............ L. cornutus (Borradaile)

5. Rostrum forwardly directed, subequal to second pereiopod chelae, dactyls of ambulatory of normal size (0.25), directed anteriorly............................................................................................ 6

– Rostrum more slender, downwardly directed, sub equal second pereiopod chelae, dactyls of ambulatory pereiopods with accessory tooth very small (ca 0.14 of unguis) or perpendicular to ventral margin................................... 7

6. Markedly slender rostrum, with two ventral rostral teeth, longer eyestalk, without medial lobe on distolateral process of proximal segment of antennular peduncle, slender fingers of second pereiopod, with accessory tooth of third dactyl well developed, presence of several rows of setae along distoventral margin of propod of third pereiopod......... L. amboinensis ( De Man)

– Second pereiopods subequal, with single rostral tooth, shorter eyestalk, with medial lobe on distolateral process of proximal segment of antennular peduncle............................................. L. pestruschka Marin, Chan & Okuno

7. Second pereiopods subequal, by unusually long distoventral tooth on basicerite of antenna, fingers of second pereiopod about 0.5 of palm length, and elongated dactyl of third pereiopod................................... L. clarki Marin, 2009

– Second pereiopods slender, chela with fingers almost subequal to palm, about 1:1, third pereiopod dactyl with unguis closely opposed to unguis........................................................................ L. pardus Marin