FAO Species Identification Guide for Fishery Purposes Western

894 Shrimps and Prawns
4a. Pterygostomian spine moderately to well developed (Fig. 17) . . . . . . . . . . . . . . . . . . → 5
4b. Pterygostomian spine reduced (Fig. 18) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 6
pterygostomian spine
Fig. 17 Metapenaeopsis barbata
(from Crosnier, 1994)
5a. Dorsal crest of third abdominal segment flat or
very slightly concave (Fig. 19a) . . Metapenaeopsis barbata
5b. Dorsal crest of third abdominal segment with
deep median groove (Fig. 19b) . . Metapenaeopsis toloensis
6a. Rostrum with 9 or 10 upper teeth . . Metapenaeopsis rosea
6b. Rostrum with 7 or 8 upper teeth (Fig. 18) . . .
. . . . . . . . . . . . . . . . . . Metapenaeopsis palmensis
7a. Rostrum forming a crest (Fig. 20) . . . . . . .
. . . . . . . . . . . . . . . . . . Metapenaeopsis lamellata
7b. Rostrum not forming a crest . . . . . . . . . . . . . . . → 8
8a. Pterygostomian spine very strong (Fig. 21) . .
. . . . . . . . . . . . . . . . . . . . .Metapenaeopsis wellsi
8b. Pterygostomain spine minute or absent
(Fig. 22) . . . . . . . . . . . . . Metapenaeopsis mogiensis
rostral
crest
carapace (lateral view)
Fig. 20 Metapenaeopsis lamellata
pterygostomian spine
carapace (lateral view)
Fig. 21 Metapenaeopsis wellsi
(from Crosnier, 1991)
Key to the species of Metapenaeus occurring in the area
Remarks on key characters: the shape of the petasma and thelycum are the main taxonomic characters
to separate species of this genus (see figures shown in the respective species accounts). Therefore, correct
identification of juveniles and immature specimens is sometimes difficult. See Miquel (1982, Zool. Verh.,
195) for more information on the species of this genus.
1a. Rostrum very short and high, not extending
beyond eye (Fig. 23) . . . Metapenaeus lysianassa
1b. Rostrum extending beyond eye . . . . . . . . . . → 2
pterygostomian spine
Fig. 18 Metapenaeopsis palmensis
(from Crosnier, 1994)
dorsal view
dorsal
ridge
dorsal
ridge
dorsal view
transverse view transverse view
a) Metapenaeopsis b) Metapenaeopsis
barbata
toloensis
Fig. 19 third abdominal segment
(from Crosnier, 1994)
pterygostomian spine
carapace (lateral view)
Fig. 22 Metapenaeopsis mogiensis
(from Crosnier, 1991)
Fig. 23 Metapenaeus lysianassa