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2010). Three of those five species, Pilumnopeus vauquelini, Pilumnus minutus and
Halimede tyche are likely to have entered the Mediterranean via the Suez canal,
while two species (Glabropilumnus laevis, Actumnus globulus) probably did so
through shipping activity (Galil et al., 2006).

Gonioinfradens paucidentatus
Gonioinfradens paucidentatus (A. Milne Edwards, 1861) is a portunid crab with a
wide Indo-Pacific distribution: (Spiridonov and Neumann, 2008; Poupin, 1994; Apel
and Spiridonov, 1998; Davie, 1998; Naderloo and Sari, 2007) (Fig. 24). It occurs
mainly on hard substrate from shallow subdital waters to 100 m of depth and
reaches a carapace length of 52.5 mm (Poupin, 1994).

Figure 24. Gonioinfradens paucidentatus
(http://decapoda.free.fr/illustration.php?n=6andsp=156)

The first record for the Mediterranean Sea of the Red Sea/Indo-Pacific portunid
Gonioinfradens paucidentatus (red swimming crab) was reported in Rodos Island
(southeastern Aegean Sea) is given, while possible introduction vectors of the
species in the area are discussed (Corsini-Foca et al., 2010).
The following alien crabs have sporadically been found in many and various
areas of the Mediterranean basin: Myra subgranulata, Herbstia condyliata, Leucosia
signata, Xanthias lamarckii, Macrophthalmus graeffei, Ixa monody, Atergatis roseus,
Hyastenus hilgendorfi, Coleusia signata, Portunus segnis, Thalamita poissonii,
Eucrate crenata, Halimede tyche, Atergatis roseus, Micippa thalia, Charybdis
(Charybdis) hellerii, Carupa tenuipes, Matuta victor, Sirpus monodi, Macropodia
tenuirostris.
Management practices with regard to the occurrence of ‘new’ species will
require comprehensive evaluation of changing habitat conditions and will depend on
the individual case. They could range from complete eradication to toleration and
consideration of the ‘new’ species as an enrichment of the local biodiversity as a
means to facilitate ecosystem restoration or to maintain ecosystem function as
native communities re-assemble and establish under a new climate regime.
A large number of alien crabs have entered and established in the
Mediterranean Sea, rendering specific measures necessary for each introduction
pathway. However a more integrated and comprehensive approach to the