Scylla paramamosain

Super Group: 
Opisthokonta
Phylum: 
Arthropoda
Sub-Phylum: 
Crustacea
Class: 
Malacostraca
Sub-Class: 
Eumalacostraca
Order: 
Decapoda
Sub-Order: 
Pleocyemata
Family: 
Portunidae
Sub-Family: 
Portuninae
Genus: 
Scylla
Species: 
paramamosain
Authority: 
Keenan, Davie & Mann 1998 (Estampador 1949)

Diagnosis

Diagnosis_Genus: Scylla de Hann 1833. Carapace oval, wider than long (CL/ICW range 0.66-0.72); moderately convex, surface smooth, gastro-cardiac grooves poorly to moderatly well defined; front clearly separated from supra-orbital angles, divided into four teeth ranging from low rounded lobes to prominent sharp spines, frontal width variable between species (FW/ICW range 0.33-0.45); anterolateral margins convex, bearing nine similar-sized teeth, longer than smooth posterolateral margins; supra-orbital margin with closed median and outer fissures; infra-orbital margins prominently toothed; antennules folded nearly transversaly; basal antennal article produced into the orbit, flagellum lying in the orbital hiatus. Chelipeds massive, smooth, longer than legs; merus with three large spines and anterior border, two smaller spines onposterior border; carpus with acute tooth at onner angle, 1-2 spines an outer margin varying from strong to obsolete; propodus with strong spine at carpal articulation, a pair of dorsal spines above base of dactyl varying from strong to obsolete, inner face with a large tubercle immediately behind base of gape. Legs stout, moderatly compressed, first three pairs similar, fourth pair natatorial. Male abdomen narrow, segments 3-5 fused; female abdomen broadly oval. Colour variable, with or without polygonal patterning.
Diagnosis_Species: Frontal lobe spines high (mean height c. 0.06 times frontal width measured between medial orbital sutures), typically triangular with straight margins and angular interspaces. Anterolateral carapace spines broad, with outer margin convex. Carpus of chelipeds with one small blunt prominence (spinous in juveniles) ventro-medially on outer margin. On juveniles, reduced second spine may be present dorso-distally. Palm of cheliped with a pair of distinct spines on dorsal margin behind insertion of the dactyl, followed by ridges running posteriorly. Chelipeds and legs with weak polygonal patterning for both sexes. Male first gonopod as in Fig 9C. Colour varies from purple through green to browny/black depending on habitat. Means and standard deviations of the most important morphological ratios for species discrimination are presented in Table 4.

Type species

The type species of the genus is S. serrata.

Type illustration / Type locality / Type specimen

Type locality: Semarang, Central Java, Indonesia.
 

Ecology

Habitat: Associated with shallow denuded coral (reef rubble) in Singapore; shallow subtidal flats and estuarine ponds in Central Java; and in mangrove forests in the lower Mekong Delta, Vietnam.
Salinity: marine
Salinity: variable

Observation site(s)

SYMBIONTS

Displaying 1 - 3 of 3
Association with... Region origin Name of site In reference...
Hematodinium perezi (clade A) Zhejiang Province Zhujiajian Island
Hematodinium perezi (clade A) Guangdong province Niutianyang culture area in Shantou
Hematodinium perezi (clade A) Zhejiang Province Zhujiajian Island