cephalothoracic


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cephalothoracic

 [sef″ah-lo-tho-ras´ik]
pertaining to the head and thorax.

ceph·a·lo·tho·rac·ic

(sef'ă-lō-thō-ras'ik),
Relating to the head and the chest.

ceph·a·lo·tho·rac·ic

(sef'ă-lō-thōr-as'ik)
Relating to the head and the chest.
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(A) Infection by female specimen on the external surface: arrow showing the specimen; (B) Female, Habitus: dorsal view; (C) Female, detail of genital complex and abdomen: ventral view; (D) Male, Habitus: dorsal view; (E) Male, anterior part of Cephalothoracic shield: arrow showing the absence of sternal furca in ventral view.
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).
Cephalothoracic shield slightly longer than wide [1.73 (1.65-1.83) x 1.62 (1.58-1.65) mm], ornamented as in female.
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.
In pseudoscorpions, adult size of these fully sclerotized cephalothoracic and pedipalpal traits is fixed at the final nymphal molt (Chamberlin 1931; Zeh 1987b).
Specimens were measured for cephalothoracic shield length (CSL = from the tip of the rostrum to the groove at the posterior edge) using a caliper (to the nearest 0.1 mm) under a stereoscopic microscope.
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).
Male (holotype): Prosoma yellowish with well marked cephalothoracic junction and fovea.
The following somatic parts of each crab were measured: maximum carapace width (CW; was always measured behind the third cephalothoracic spine), abdomen width for females (AW; obtained from the 5 th to 6th abdominal somite) and gonopod length for males (GL) to the nearest 0.1 mm using a Vernier caliper.
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., 2008) and lobsters (Helluy and Beltz, 1991).