Champs morphogénétiques mis en évidence par l'étude au microscope électronique à balayage des soies au niveau des pattes d'abeilles (apoidea, megachilidae)

The hairs covering the legs of several species of female megachilid bees are arranged in imbricated fields. At the boundaries of these fields, either the hairs show a morphology intermediate between those of the contiguous fields, or there is a narrow strip with an irregular mosaïc of several hair types. It is suggested that: 1. The structure of the hairs may be determined by the territory in which the trichogenous cell is located. 2. Some morphogenetic fields are bidimensional and cross the segmentary boundaries. The name ‘regional fields’ is proposed for them. 3. The regional fields may be modulated within each segment into which they extend. © 1973, Longman Group Ltd. All rights reserved.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

ETUDE AU MICROSCOPE ELECTRONIQUE A BALAYAGE DES SCOPAS COLLECTRICES DE POLLEN CHEZ LES FIDELIIDAE (HYMENOPTERA, APOIDEA)

SCOPUS: NotDefined.jinfo:eu-repo/semantics/publishe

Étude au microscope électronique à balayage des scopas abdominales chez de nombreuses éspeces d'abeilles (Apoidea, Megachilidae)

Abdominal scopas (pollen collecting brushes) of 92 species of Megachilid bees have been studied with the Stereoscan. The scopal setae of different species could be classified into six different types, although transitions do exist from one type to another. In most species all setae from the same scopa are alike, but in some species different types coexist in the same scopa, arranged into a gradient showing transitions from one type to another. Those facts allow us to conclude at the existence of a scopal field by the transformation of both non-specialized setae hitherto described. Suggestions are presented to explain the specific diversity of scopal setae. © 1974.SCOPUS: ar.jinfo:eu-repo/semantics/publishe