Download PDF as one large file - AToL Decapoda

Genus Lysmata Risso 1816
Key to species
[Adapted from Chace, 1972]
Family Hippolytidae 233
1. Scaphocerite overreaching antennular peduncle slightly, if at all (rostrum with 4-6
ventral teeth; antennal tooth distinct from depressed and obscure ventral angle of
orbit; carapace with pterygostomian tooth on anteroventral margin; stylocerite
falling far short of distal margin of basal antennular segment; distal tooth of
scaphocerite distinctly overreaching distal margin of blade; exopod of third
maxilliped reaching at least to midlength of antepenultimate segment; carpus of
second pereopod composed of 17-23 segments) .. L. amboinensis
Scaphocerite distinctly overreaching antennular peduncle (exopod of third
maxilliped reaching to, or beyond, midlength of antepenultimate segment) 2
2. (1) Antennal tooth fused with ventral angle of orbit; stylocerite reaching beyond distal
margin of basal segment of antennular peduncle; accessory branch of dorsolateral
antennular flagellum well developed (2 to 4 teeth of dorsal rostral series situated on
carapace posterior to level of orbital margin; carapace with pterygostomian tooth on
anteroventral margin; scaphocerite more than four times as long as wide, distal
tooth distinctly overreaching distal margin of blade; carpus of second pereopod
composed of 28-30 segments) L. intermedia
Antennal tooth distinct from depressed and obscure ventral angle of orbit;
stylocerite falling far short of distal margin of basal antennular segment; accessory
branch of dorsolateral antennular flagellum vestigial or absent 3
3. (2) Rostrum usually reaching as far as, or beyond, distal end of antennular peduncle;
scaphocerite five times as long as wide L. rathbunae
Rostrum reaching not much, if at all, beyond second segment of antennular
peduncle; scaphocerite less than four times as long as wide L. wurdemanni