mesosoma


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mesosoma

[¦me·zō′sō·mə]
(invertebrate zoology)
The anterior portion of the abdomen in certain arthropods.
The middle of the body of some invertebrates, especially when the phylogenetic segmentation pattern cannot be determined.
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Intact scorpion carcasses and exuvia were photographed, and the following exoskeletal characteristics were recorded for each specimen: 1) curvature of the mesosoma and metasoma; 2) presence or absence of telescoped mesosomal and metasomal segments; 3) position/orientation of the chelicerae; 4) position/orientation of the walking legs; and 5) position/orientation of the pedipalps.
They are bicolored with the head and mesosoma being dark brown to blackish brown and appendages, petiole, and gaster being milky white.
Diagnosis: A most characteristic species on account of slender body with mesosoma twice as long as wide and female metasoma 1.
They were acclimated to the temperature of the unit for at least 6 min; pilot tests, performed with a Sensortek BAT-12 thermocouple connected to a Harvard Apparatus microprobe inserted into the mesosoma (abdomen), show this is more than sufficient time for a scorpion's [T.
Most species of Diaparsis are conspicuously larger than Aneuclis and Sathropterus species, often have a deep and strongly oblique foveate groove in the anterior part of the mesopleuron (this groove, if present, is usually weak in Aneuclis and Sathropterus) and they frequently have a densely and coarsely punctate head and mesosoma (impunctate or finely punctate in Aneuclis and Sathropterus).
Acanthaegilips notiobiellus: malar area in lateral view (a); propodeum (b), and male antennae (c); mesosoma in lateral view of: (d) A.
Head black, except mandible testaceous; antenna brown; mesosoma black; metasoma brown; legs brown, except articulations and tarsal segments 1-4 testaceous.
nuda is a flat dorsal mesosoma in profile with no distinct metanotal groove.
Head black, except mandibles testaceous; antennae testaceous, except segments 7-10 brown; mesosoma black; gaster brown; legs testaceous, except stalks of hind femora darkened.
Mesosoma is normal for the genus; fore wing proximal to linea calva with a single complete line of setae, occasionally with few setae in an angle between the line and marginal vein.
Description: Metasoma, legs and wing veins very dark, head, antenna and mesosoma less dark.
Mesosoma brownish-yellow with broad, transverse band across each tergite; pretergites infuscated, tan-brown; post-tergites with reticulate infuscation concentrated near carinae, becoming paler posteriorly; posterior margins pale brownish-yellow, not infuscated.