FAO Species Identification Guide for Fishery Purposes Western

Penaeidae 895
2a. Rostrum armed with teeth along entire upper border (Fig. 24) . . . . . . . . . . . . . . . . . . → 3
2b. Rostrum unarmed in its distal 1/3 to 1/2 (Figs 25 and 26) . . . . . . . . . . . . . . . . . . . . →16
epigastric tooth
unarmed
Fig. 24 Metapenaeus ensis
Fig. 25 Metapenaeus eboracensis
(after Miguel, 1982)
3a. Telson with 3 pairs of large movable spines (Fig. 27b) . . . . . . . . . . . . . . . . . . . . . . → 4
3b. Telson without large movable spines (although sometimes with many minute spinules;
Fig. 27a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 6
distinct crest
epigastric tooth
Fig. 26 Metapenaeus tenuipes
(after Miguel, 1982)
movable
spines
a) Metapenaeus ensis b) Metapenaeus anchistus
Fig. 27 telson and left uropod (dorsal view)
(after Motoh and Buri, 1984)
4a. In males, distolateral projections of petasma not reaching as far as distomedian ones,
armed with a pair of spinules on each externodistal side; in females, thelycum with a
posteromedian ogival boss, coxal projection of fourth leg very long, flat and truncate
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Metapenaeus intermedius
4b. In males, distolateral projections of petasma exceeding distomedian ones, without
external spinules; in females, thelycum without a posteromedian boss, coxal projection
of fourth leg a conical process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 5
5a. In males, a wide space between distomedian projections of petasma; in females, lateral
plates of thelycum with raised posterior edge, a deep fissure between lateral plates and
posterior transverse ridge . . . . . . . . . . . . . . . . . . . . . . . . . Metapenaeus endeavouri
5b. In males, a narrow space between distomedian projections of petasma; in females,
lateral plates of thelycum without raised posterior edge and continuous to posterior
transverse ridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Metapenaeus anchistus
6a. First leg with ischial spine subequal to basial spine . . . . . . . . . . . . . Metapenaeus suluensis
6b. Ischial spine of first leg much smaller then basial spine, minute or absent . . . . . . . . . . . . → 7
7a. In males, distomedian projection of petasma swollen; in females, lateral plates of
thelycum with raised lateral or ventral ridges . . . . . . . . . . . . . . . . . . . . . . . . . . . → 8
7b. In males, distomedian projection of petasma not swollen; in females, lateral plates of
thelycum without raised ridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . → 12