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Egg morphology and hatching in Mormidea pictiventris (Hemiptera: Pentatomidae)

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Abstract:

Egg morphology and hatching in the stink bug Mormidea pictiventris (Hemiptera: Pentatomidae) are described with the aid of scanning electron microscopy. In addition, the eggshell is analyzed using transmission electron microscopy and the distribution of follicle cells at the surface of ovarian eggs is studied by epifluorescence microscopy using a DNA-specific fluorescent dye. The surface of the barrel-shaped eggs carries numerous slender processes. Binucleate follicle cells, in most cases arranged in a hexagonal pattern, are responsible for the synthesis of this portion of the eggshell. The rim at the anterior pole of the egg is studded at irregular intervals with short columnar processes, the aero-micropylar processes. Hatching occurs at this pole. The prolarva is wrapped in an embryonic cuticle. Its head portion carries a Y-shaped element, the egg-burster. The major features of the inner face of the eggshell are subtle, radially oriented grooves at the anterior plate and a hexagonal pattern to the surface ornamentation throughout the remainder of the eggshell. Transmission electron microscopy revealed that the processes extending from the surface of the eggshell have a coarse texture, while the eggshell proper is composed of amorphous material. The innermost layer, however, has a trabecular organization. The findings in M. pictiventris are compared with morphological observations on the eggshell in other families of Hemiptera and suggestions are made concerning the meaning of the diverse structures.

On trouvera ici la description de la morphologie et de l'éclosion des oeufs de la punaise puante Mormidea pictiventris (Hemiptera : Pentatomidae) après examen au microscope électronique à balayage; la coquille a été analysée par examen au microscope électronique ordinaire et la répartition des cellules folliculaires à la surface des oeufs ovariens a été étudiée par microscopie à épifluorescence à l'aide d'un colorant fluorescent spécifique de l'ADN. Les oeufs, qui ont la forme de barillets, portent à leur surface de nombreux processus effilés. Les cellules folliculaires binuclées, la plupart réparties selon un arrangement hexagonal, sont responsables de la synthèse de cette portion de la coquille de l'oeuf. Le rebord qui suit le pôle antérieur de l'oeuf est criblé de colonnes courtes à intervalles irréguliers, les processus aéro-micropylaires. C'est par là que se fait l'éclosion. La prolarve est enveloppée dans une cuticule embryonnaire. Sa portion céphalique porte un élément en Y servant à la rupture de l'oeuf. Les principales caractéristiques de la face interne de la coquille sont la présence de sillons délicats disposés en rayons à la plaque antérieure et l'ornementation de surface en hexagone sur le reste de la coquille. Le microscope électronique ordinaire révèle que les processus qui sont insérés à la surface de la coquille ont une texture grossière, alors que la coquille proprement dite se compose de matériaux amorphes. La couche la plus interne a cependant une organisation trabéculaire. Ces caractéristiques morphologiques de la coquille observées chez M. pictiventris sont comparées à celles des autres hémiptères et le rôle possible de certaines de ces structures est examiné.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2001-04-01

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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