FAO Species Identification Guide for Fishery Purposes Western

1010 Lobsters
Key to the species of Justitia occurring in the area
1a. Median spine on anterior margin of carapace flanked by 2 to 3 pairs of spines (Fig. 9a);
antennular peduncle distinctly exceeding antennal peduncle; first pair of legs of males
extremely long and forming false pincers (Fig. 10); abdomen not banded . . . . Justitia longimanus
1b. A single median spine present on anterior margin of carapace (Fig. 9b); antennular
peduncle reaching as far as antennal peduncle; first pair of legs short and simple in both
sexes; abdomen covered with red bands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 2
2 or 3 pairs
of spines
frontal
horns
1 median
spine
median
spine
smooth
false pincer
of males
a) Justitia longimanus
b) Justitia japonica
Fig. 9 carapace (dorsal view)
Fig. 10 Justitia longimanus
2a. Distal antennal segment with dorsal spine (Fig. 11a); frontal horns usually with 2 dorsal
teeth; abdomen with intermediate grooves, usually interrupted and poorly defined,
present between main grooves (Fig. 12a); red bands on abdomen located at posterior
margin of each segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Justitia chani
2b. Distal antennal segment without dorsal spine; frontal horns usually with 3 dorsal teeth;
abdominal grooves simple, without intermediate grooves; red bands on abdomen
located at anterior margin of each segment . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 3
3a. Antennal peduncle with disto-outer spine much larger than disto-inner spine (Fig. 11b);
third to fifth abdominal segments each with 7 transverse grooves (Fig. 12b); lateral
carapace without special coloured patches . . . . . . . . . . . . . . . . . . . . . Justitia japonica
3b. Disto-outer and disto-inner spines of antennal peduncle similar in length (Fig. 11c); third
to fifth abdominal segments each with 5 transverse grooves (Fig. 12c); lateral carapace
with 2 red patches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Justitia vericeli
a) Justitia
chani
disto-inner
spine
disto-outer
spine
distal
segment
dorsal
spine
b) Justitia
japonica
disto-outer
spine
c) Justitia
vericeli
disto-inner
spine
Fig. 11 right antennal peduncle (dorsal view)
intermediate grooves
main
grooves
1
1
2
3
4
5
6
2 3
45
6
a) Justitia chani b) Justitia japonica
1
2
3
4
c) Justitia vericeli 5
Fig. 12 abdomen (lateral view)
(from Poupin, 1994)
7 transverse grooves
5 transverse
grooves