International Journal of Marine Science, 2017, Vol.7, No.36, 361-365
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lengths mainly along transverse carapace ridges, never completely obscuring surface. Anterolateral margin with 3
teeth behind exorbital angle; first anterolateral tooth blunt, second and third teeth acute but not spine-tipped.
Figure 2
Pilumnopeus convexus
male general view
Note: A: overall dorsal view; B: ventral view
The chelipeds are unequal in both the sexes (Figure 2A). In larger specimens, the large chela appears to be smooth,
very minute granules are present on ischium, merus carpus and outer surface of propodus. All the walking legs are
with short and long plumose setae; smaller chela covered with fine granules and scattered short setae
The abdomen (Figure 2B) is seven segmented, all the segments are clearly marked, both the margins are fringed
with thickly plumose setae, and sparse plumose setae on the surface of the abdomen are also visible. The first
gonopod (Figure 2B) is strongly curved (S-shaped). The distal part is very strongly incurved.
2.1.3 Remarks
P. convexus
(Maccagno, 1936), was originally described (but not figured) from two female specimens from
Ethiopia (size not stated). The population of
P. convexus
(Maccagno, 1936) in this study seems to be large sized.
The males were 19.8-27.6 mm long while females were17.4-25.7 mm. Cooper (1997) has mentioned two types of
populations, one being larger from the mangrove area and the other smaller from the beach, male 12.5-18.0 mm,
female 11.1-17.2 mm.
P. convexus
is one of the most common species found in a variety of habitats along the intertidal coast of the
Persian Gulf. Apel (2001) examined material recorded as
P. vauquelini
by Stephensen (1946) and Basson et al.
(1977) from the Persian Gulf and identified them as
P. convexus
. Apel (2001) believed that
P. vauquelini
does not
occur in the Persian Gulf. He mentioned four morphologic characters allowing distinguishing these two closely
related species (Apel, 2001).
2.1.4 Distribution
Distribution: Red Sea, Persian Gulf (Barnard, 1955) And now for the first time from Khor Al-Zubair, far of
Northern of Arabian Gulf. The specie was recorded from sandy beach and under the rock in shores. The species is
recorded from various habitats, such as mangroves, sandy beach and rocky shores.
2.2 Genus
Eurycarcinus orientalis
2.2.1 Material examined (msc)
Carapace measurements are length (CL) mm x breadth (CB) mm, respectively.
