prosoma


Also found in: Dictionary, Medical, Wikipedia.

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 ?
Neither male nor female body measurements (body mass, prosoma width, body condition) significantly differed between treatment groups (t-tests: all [t.sub.73] < 1.95, all P > 0.05).
Matthiesen (1979) identified this deformity in the scorpion Tityus cambridgei (Pocock): the affected individual had a double prosoma, two sets of eyes and four pedipalps.
Female's total length: 4.90, prosoma length 2.30, prosoma width 1.80, opisthosoma length 2.60, opisthosoma width 2.10.
Key to the sub orders, families and genera: 1 With dentate faces of cheliceral digits directed externally (laterally), presence of a well developed hypostome provided ventrally with re-curved teeth; with lateral stigmatal openings behind coxae-IV or laterally above coxae II-III; prosoma completely fused; no trace of segmentation to the abdominal section; behind the legs size large, possession of true Haller's organ on the I pair of legs..........................................sub order Ixodida.
Coloracion y patron de pigmentacion: Color general amarillo castano, con manchas cafes oscuras; patas y parte ventral del prosoma y mesosoma amarillentas, peines blanquecinos.
La parte anterior del cuerpo o prosoma esta cubierto por un caparazon en la region dorsal, y por todas las coxas de los pedipalpos y las patas (Figura 2), en la region ventral.
This image of a fused body corresponds to other orders of arachnids, either with ticks and mites or with opiliones (harvestman, daddy longlegs), which are arachnids like spiders but with a prosoma and opisthosoma united throughout their whole width and many with long legs.
After mating trials were complete, we measured three linear body measurements to the nearest 0.01 mm of each spider: patella-tibia length (contiguous leg segments) of the right foreleg, prosoma width and opisthosoma width.
All females of adult size (>120 mm) and appearance were examined for presence of eggs by drilling a 4 mm diameter hole at a medial point along the posterior angle of the prosoma. A hole was drilled in all adults for insertion of a button tag.
In HH21 to HH23 stages, the cartilage prosoma of phalanges should begin to appear, and the phalanges mode initiated to form.
An interesting discovery was that tufted males have a highly reflective area posterior to the tufts on the dorsal prosoma. The location of this bright spot suggests a unique means of illuminating or backlighting the tufts when males position themselves in a courtship stance and are facing females, perhaps silhouetting the tufts for contrast against backgrounds.