The genus is characterized by having: relatively large body (more than 5 mm long); a crown-like mound containing numerous black-tipped tubercles on cephalothorax
anterior to the ocularium, coxae I-IV smooth and only with sparse setae; chelicerae usually normal structured with blackish brown zebra-like stripped pattern, pedipalps short, robust and femora, patella, tibiae covered with numerous black-tipped tubercles (males having microtubercles on ventor of tarsus); legs short or more commonly long (Tsurusaki 1987; Tsurusaki et al.
The body of the mite is divided into two regions; a front part called the cephalothorax
and a hind part called the abdomen.
grapsus, may cause mutilation, injuries to the abdomen or cephalothorax
, and even death by cannibalism (Romero 2003, Freire et al.
The degree of dorsoventral flattening (depression) of the cephalothorax
was modest, as judged by preserved shape and by the orientation of the specimens on the bedding plane (Fig.
Approximately 25% of all the crabs surveyed by McGaw (2006) had one or several seaweeds growing on the antennae and anterior margins of the cephalothorax
, probably used as camouflage.
of the crustacean was then separated from the remainder of the body, exposing the internal parts.
In a typical cycle of leg movements, the right leg I was pulled to the cephalothorax
, holding the capture line until the next leg (left, II) grasped it, when leg I (right) was put forward, while leg II (left) was pulled to the cephalothorax
; this sequence passed orderly through the front legs (I right, II left, I left, II right) only to repeat itself as a cycle until the spider touched the prey hanging on the capture thread.
While continuing to press the animal down with the glass rod, the handling chamber is removed and the sides of the animal's cephalothorax
are grasped between the index finger and thumb (Figure 1d).
Coded plastic tags were glued to the cephalothorax
for individual identification.
In complete specimens in which the cephalothorax
and abdomen are attached, the latter usually is found curled anteriorly beneath the cephalothorax
Accordingly, the larger size of adult females' cephalothorax
correlates with their larger body which is related to their capacity to produce large numbers of eggs (Gertsch 1949).
9mm at abdomen; cephalothorax
triangular in some individuals.