Discrimination of the different stimuli is mediated by peripheral chemoreceptors grouped within a varied array of cuticular sensory organs called sensilla, which are located mainly on the cephalothoracic
appendages including antennae, maxillipeds (mouthparts), antennules, and pereiopods (walking legs) (Schmidt and Mellon, 2011; Thiel and Breithaupt, 2011).
shield slightly longer than wide [1.
For macroscopic studies, 10 animals had their cephalothoracic
cavity opened and the hepatopancreas dissected and analyzed.
Since these values are hard to determine experimentally, we used the results from a number of different approaches: 1) a basic infiltration test (using acetone) for detecting the presence of empty (air-filled) layers (see Parker 2000); 2) previous studies, which have reported spider reflectors from the abdominal and cephalothoracic
regions as being comprised of air and chitin layers (Parker & Hegedus 2003; Land et al.
The ovarian maturation stage was scored as stage 1 (no vitellogenic oocytes visible), stage 2 (the developed vitellogenic oocytes were observed in less than half of the cephalothoracic
space available for oocytes), stage 3 (more than half of the space filled), and stage 4 (space available completely filled).
and abdominal segment sutures visible.
i] are the total weight and cephalothoracic
length of the i-th individual, and a and b are the parameters of the potential function.
Male (holotype): Prosoma yellowish with well marked cephalothoracic
junction and fovea.
Developmental plateaus, during which neither the growth of the eye nor the cephalothoracic
segment is evident, have been documented both in crabs (Stevens and Swiney, 2007; Stevens et al.
Submedian pockets (smp) were visible on cephalothoracic
and abdominal segment sutures.
The majority of the cephalothoracic
appendages were torn off, disarticulated, and the flesh removed, leaving the exoskeleton completely clean.