| 特徴： | Synonyms: Common names: Asian crab, Asian paddle crab, blue crab, paddle crab, swimming crab. Organism type: crustacean.Habitat description In Korea, juvenile C. japonica (<25mm carapace width W) are abundant in eelgrass (Zostera marina) meadows (Huh and An 1998, in Smith et al. 2003), but there are few other accounts of their distribution and habits in wild populations. In Auckland (New Zealand) it is found in estuarine habitats comprised of ‘firm sand-muddy fine sand flats’ or ‘muddy-shelly fine sand’ habitats (Gust and Inglis 2006).Charybdis japonica have a carapace width of up to 12cm (Gust et al. 2003). They have a pilose (hairy) carapace (although amount of hair varies to little or none). The carapace has ridges with six frontal teeth, triangular and sharp. The inner supraorbital lobe is broadly triangular (Smith et al. 2003). Wee and Ng (1995) record the colour of C. japonica in Japan as mottled cream and purple. In the Waitemata harbour (New Zealand) specimens varied from pale green and off-white, through olive green to a deep chestnut with purplish markings on the carapace and upper surfaces of the appendages (Smith et al. 2003). In addition, most Waitemata specimens have yellow-orange markings, some with only a hint of yellow-orange and some with very noticeable brown-orange on parts of the carapace and the legs, especially on the chelae where the upper colouration grades into the white to off-white ventral surfaces (Smith et al. 2003). |