Immature stages, internal morphology and morphometry of Platyscytus decempunctatus (Carvalho, 1945) (Heteroptera: Miridae) / Estágios imaturos, morfologia interna e morfometria de Platyscytus decempunctatus (Carvalho, 1945) (Heteroptera: Miridae)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Platyscytus decempunctatus (Heteroptera: Miridae) is a small mirid (three to four mm) found in plants of Solanum cernuum Vell. (Solanaceae), where it develops throughout its life cicle. The study of the insect internal morphology describes the basic internal tracts of the salivary glands, the midgut, the male and female reproductive structures and the Malpighian tubules. This species has salivary glands of the tubular form, an ovary of the telotrophic type with three ovarioles in the right ovary and five in the left one. In the male reproductive trait was observed the presence of only one pair of accessory glands of tubular or sacs-like form. The phytophagous feeding habitat was confirmed by the observation of chlorophyll pigments in the gut of all dissected specimens. The Malpighian tubules are formed by a unique layer of cells with microvills. The description and the diagnosis of the stages from egg to adult of P. decempunctatus was also studied inclunding male reproductive organ and trait. A morfometric study of 27 morphological traits of P. decempunctatus was carried out to recognize differences between sexos and seasons in insects collected throughout a year in Viçosa, MG. Interpopulation differences were also investigated in a subsequent study with 23 populations collected collected from the states of Minas Gerais and Rio de Janeiro. A study of spot variations among these populations was carried out, showing the spot pattern observed on the description of type specimen and 27 more spot patterns also observed in P. decempunctatus. New occurrences for the geographic distribution were registred for this species strengthening the interelations with its host plant, S. cernuum.

ASSUNTO(S)

platyscytus decempunctatus biological aspects immature stages aspectos biológicos morphometry morfometria estágios imaturos spot pattern distribuição geográfica manchas dorsais geographic distribution taxonomia dos grupos recentes platyscytus decempunctatus

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