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.
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.
One prosomal sac-like scent gland is situated directly beneath the integument on each side of the carapace.
These little-known late Cambrian-mid Devonian marine euchelicerates are characterized by a long postabdomen of nine segments, but share prosomal features with both eurypterids and xiphosurans, rendering their monophyly and affinities uncertain.
Measurement consisted of recording the inter-ocular width (IO), the distance between the inside margins of the horseshoe crab's compound eyes, and the prosomal width (P), which is the distance across the horseshoe crab's carapace.
The prosomal widths of the crabs were measured and recorded.
The illustration of the prosomal ventral complex seems to indicate a closed gonostome, typical of immature specimens.
Note that leg measurements were standardized to a common prosomal wet weight; see Table 2.
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.