prosoma

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prosoma

[prō′sō·mə]
(invertebrate zoology)
The anterior part of the body of mollusks and other invertebrates; primitive segmentation is not apparent.
References in periodicals archive ?
Eggs, if present, escape the carapace and are visible because of internal pressure or as a result of gently pressing the prosomal angle.
Summary of prosomal widths for horseshoe crabs within Delaware Bay during the spring of 2003 to 2005.
We recorded prosomal width (to the nearest 1 ram), weight (to the nearest 10 g), sex, and maturity stage for all or a subsample of horseshoe crabs at each site.
For some states, the average weight of horseshoe crabs was not available, and therefore we used the PW-weight equations that were derived from this study to estimate the average weight of horseshoe crabs based on an average measured prosomal width.
One prosomal sac-like scent gland is situated directly beneath the integument on each side of the carapace.
For subsamples of a large catch, 50 crabs greater than 150 mm prosomal width were examined, as well as all small, soft, and shedding crabs.
Ventral prosomal complex of male with coxae of legs 11 and IV meeting in the midline, but coxae I and III not so (Fig.
By contrast, in spiders, both leg and prosomal muscles are heavily involved in locomotion (Anderson & Prestwich 1974) and opisthosomal mass was often no more than 40% of total mass (Prestwich 1983a, b).
In spiders, prosomal pressures as high as 450 torr are generated during struggling, running and jumping and these prevent the circulation of well-oxygenated hemolymph from the book lungs to active muscles because maximum cardiac pressures are below 100 torr (Parry & Brown 1959; Anderson & Prestwich 1974; Prestwich 1988a, b).
The prosomal area of the offspring did not differ significantly between copulation duration treatments with the effect of mothers nested within treatment (ANOVA, main treatment effect: [F.
Rather, the uniqueness of the method is attributable both to the prosomal source of the materials, the venom glands (Kovoor 1987; Kovoor & Zylberberg 1972), and to the forceful and directed ejection of the mixture (Millot 1930; Bristowe 1931).
6% of prosomal volume) while in Scytodes they comprise nearly 10% (15% of prosomal volume).