Metasternum


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Met`a`ster´num


n.1.(Anat.) The most posterior element of the sternum; the ensiform process; xiphisternum.
2.(Zool.) The ventral plate of the third or last segment of the thorax of insects.
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1, 2) habitus, dorsal and ventral view; 3) mentum; 4) prosternal process and metasternum; 5) head in dorsal view; 6-8) aedeagus in dorsal, ventral and lateral view.
Prosternum with distinct postocular lobes; precoxal portion of prosternum elongate; postcoxal portion of prosternum short; procoxal cavities separated; prosternum with ventral channel; mesocoxal cavities widely separated; mesepimeron not ascended; metasternum quite short; metepisternum quite broad, 6.1 times longer than width in middle.
palmyra for the present, because they possess the distinctively concave posterior metasternum, a small and bidentate posteromedial metasternal process, and a basally incised fore tibia, but have not designated them as paratypes because of the significant geographic distance separating the two populations, which suggests that the Pagan population may eventually prove to be a distinct species once additional material is available for a more detailed evaluation.
INTRODUCTION: The sternum consists of a cranial manubrium (Prosternum), an intermediate body (Mesosternum) and a caudal Xiphoid process (Metasternum).
Head capsule usually wider than long, oval, depressed, frons ridged between and above antennae; mouth parts inferior; prosternum variable; pronotum usually wider than long occasionally as wide as long, convex, prosternal process short, truncate; mesepisternum and mesepimeron cut off from mesocoxal cavity by meso- and metasternum, mesepimeron reduced in size; scutellum cordate; tarsi, simple; claws, simple, dentate or undentate.
Mesonotum with 1 moderately long brownish notopleural, 1 postalar and 4 subequally long scutellar setae (apical pair cruciate); some minute setulae present behind postpronotal lobe; mesosternum and metasternum between posterior four coxae bare.
19(17) Tercer tarsomero lobulado, cuarto tarsomero simple; hipomeron sin cavidades antenales; mesosternum y metasternum fusionados Semiotus