Redescription of the freshwater shrimp Macrobrachium jelskii (Miers, 1877) (Caridea, Palaemonidae)
Author
Vera, Ana Luiza
Author
Carvalho, FabrÃcio Lopes
Author
Mantelatto, Fernando Luis
text
Zootaxa
2017
4269
1
journal volume
33013
10.11646/zootaxa.4269.1.2
59664c93-3249-42ea-a642-923c44a238b3
1175-5326
581285
7774D8D9-800E-4B81-AFB9-81F8B63623CE
Key to differentiate
Macrobrachium jelskii
,
M. amazonicum
and
M. acanthurus
1 Distal enlargement of the carpus of the second pereiopod gradual (
Figure 6
a); rostrum distinctly surpasses the scaphocerite; rostrum has an evident portion without teeth (
Figure 7
a); internal pair of posterior spine of the telson at most 2 times longer than the median apex in small individuals; internal pair of posterior spine of the telson does not reach the median apex in adults (
Figure 8
a)..............................................................................
M. amazonicum
-
Rostrum reach or slightly overreach end of the scaphocerite; rostrum does not have an evident portion without teeth (
Figures 7
b and 7c); internal pair of posterior spine of the telson surpasses the median apex and is more than 2 times longer (
Figures 8
b and 8c)............................................................................................. 2
2 Carpus of the second pereiopod similar to the chela length, chela longer than half of the carapace length, distal enlargement of the carpus gradual (
Figure 6
b)...............................................................
M. acanthurus
-
Carpus of the second pereiopod noticeably longer than the chela, distal enlargement of the carpus abrupt (
Figure 6
c).....................................................................................................
M. jelskii