FAO Species Identification Guide for Fishery Purposes Western

Scyllaridae 1031
4a. Merus of third maxilliped convex on ventral surface and provided with deep incisions on
inner margins (Fig. 8d) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ibacus brevipes
4b. Merus of third maxilliped concave on ventral surface and without deep incisions on inner
margin (Fig. 8e) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 5
anterior
teeth of
a) Ibacus brucei
epistome incision
c) Ibacus peronii
merus of 3 rd
maxilliped
merus of 3rd maxilliped
incision
d) Ibacus brevipes
Fig. 8 mouth field (ventral view)
5a. Body heavily pubescent (Fig. 7e);
posterior margin of fifth abdominal
segment evenly serrated
(Fig. 9a) . . . . . . . . . . . Ibacus pubescens
5b. Body except distal segment of antenna
naked (Fig. 7f); posterior
margin of fifth abdominal segment
only with a median spine and 3 to
4 lateral tubercles (Fig. 9b) . . . Ibacus ciliatus
anterior teeth
of epistome
b) Ibacus novemdentatus
merus of
3 rd
maxilliped
evenly
serrated
median
spine
incision
e) Ibacus ciliatus
a) Ibacus pubescens
merus of 3 rd
maxilliped
4
5
6
merus of 3 rd
maxilliped
b) Ibacus ciliatus
Fig. 9 posterior part of abdomen (dorsal view)
Key to the species of Parribacus occurring in the area
median carina elevated transverse groove
wide and naked
1a Median carina on second and third
abdominal segments markedly elevated;
transverse grooves separating
articulated and non-articulated parts
articulated part
of abdominal segments wide and almost
naked (Fig. 10a) . . . Parribacus antarcticus
a) Parribacus antarcticus
1b Median carina on second and third
non-articulated part
abdominal segments low; transverse
articulated
grooves separating articulated and
part smooth
non-articulated parts of abdominal
segments narrow and hairy (Fig. 10b) . . . . . → 2
transverse groove
narrow and hairy
median
carina
low
4
5
6
b) Parribacus holthuisi
Fig. 10 third abdominal segment (dorsal view)