mesosternum


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mesosternum

[¦me·zō′stər·nəm]
(anatomy)
The middle portion of the sternum in vertebrates. Also known as gladiolus.
(invertebrate zoology)
The ventral portion of the mesothorax in insects.
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Mesonotum with 1 long notopleural, 1 similar postalar and 4 scutellars (lateral pair nearly as long as notopleural seta, apical pair longer, subparallel); acrostichals lacking; dorsocentrals uniserial, mostly minute, prescutellar pair nearly as long as lateral scutellars; mesosternum and metasternum bare between posterior four coxae.
Mesosternum punctuate and pubescent laterally; mesosternum scar oval well-defined, punctuate and densely pubescent.
COLORATION: Head and thorax dark yellow, mottled with pink spots, with punctures black to reddish brown; rostral segments I to III dark yellow, and IV brown; pro- and mesosternum black; anterior and posterior lobe of metathoracic peritreme pale yellow; coxae and trochanter dark brown with irregular yellow marks; fore and middle femur dark yellow and densely mottled with black marks; hind femora dark reddish-orange, scattered with black marks; abdominal sterna dark orange, mottled with pink spots, with yellow irregular spots at posterior margin of sterna III to VII; genital capsule dark orange.
Venter: prosternum parrot green, metasternum piceous, mesosternum and abdomen yellowish tinged with brown.
3(2) Mesosternum, mesepimeron y mesepisternum no forman parte del borde de la cavidad mesocoxal (Figura 4) 4
Mesosternum with 1 lateroanterior pair of well-developed spiracles, each with 1 seta near internal borders.
median carina on the pronotum, the length of first segment of middle tarsus being more than 2.5 (but less than 4) times that of the second segment; the mesosternum less than twice length of metasternum, and the short, conate parameres, whereas the sister group relationship between Gerris and Aquarius is diagnosed by the basis of the first antennal segment being shorter than half the body length; the absence of a pale median stripe on the pronotal lobe, the thickened fore femora of the female, and the incrassate fore femora of the male (Damgaard and Cognato, 2005).
Brownish yellow with black antennae, head, deflexed portions of mesonotum lateral to scutellum, mesoscutellum, metanotum, metascutellum, mesosternum, anterior margin of propodium, terminal 1/4 of ovipositor sheath, apices of all tibiae and tarsi.
Mesocoxae widely spaced; mesosternum clearly impressed posteriorly on either side of mesosternal apophysis; apophysis triangular, moderately prominent, minutely scabrous, posteriorly slightly depressed, very wide, anteriorly strongly attenuated, extending into very narrow, sharp, elevated midline carina, almost reaching anterior mesosternal edge.