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Hospicidal Behavior of the Cleptoparasitic Wasp Sapyga Luteomaculata and Investigation Into Ontogenetic Changes in Its Larval Anatomy (Hymenoptera, Vespoidea, Sapygidae)
This study describes the nesting biology of the Egyptian cleptoparasitic wasp Sapyga luteomaculata Pic, which attacks the nests of two species of bees, Osmia submicans Morawitz and Megachile minutissima Radoszkowski, both belonging to the Megachilidae. We include descriptions of the egg/mature oocyte and of the first and last larval instars. We also identify the anatomical changes in the larva that take place as it transforms through intermediate instars from a host-killing first instar to a form adapted to feeding on the stored provisions supplied by the host. Biological subjects treated are egg deposition, ovariole statistics, eclosion, larval behavior including cocoon construction and defecation, and competition with other cleptoparasites. Comparisons are made throughout with accounts of other Sapyginae. Many biological and larval anatomical similarities between Sapyga and cleptoparasitic bees are recognized, and only a few possible cleptoparasitic novelties are identified.
Last Larval Instar and Mature Oocytes of the Old World Cleptoparasitic Bee Stelis Murina, Including a Review of Stelis Biology (Apoidea, Megachilidae, Megachilinae, Anthidiini)
Herein we describe the mature oocyte and last larval instar of Stelis (Stelis) murina Pérez, a cleptoparasite associated with Osmia (Pyrosmia) submicans Morawitz near Ismailia, Egypt. The mature oocyte is compared with that of Stelis (Stelis) elongativentris Parker and found to be approximately equal in size. The mature oocyte of S. murina is also very close in size to that of its host, an unusual phenomenon in host-cleptoparasite relationships in bees. A review and analysis based on literature accounts of what is known about the mode of cleptoparasitism of Stelis is offered. Added are observations on the biology of Stelis murina resulting from our fieldwork. The mature larva of Stelis murina is described and found similar but not identical to those of other known Stelis larvae. We also include a preliminary key to the genera of cleptoparasitic megachilids based on known mature larvae and also a summary describing the modes of cleptoparasitism by these taxa.
Larval Diversity in the Bee Genus Megachile (Hymenoptera, Apoidea, Megachilidae)
Mature larvae of five species representing each of the three principal groups within the genus Megachile sensu lato (i.e., including Creightonella and Chalicodoma, which are often recognized at generic rank) are described and are revealed to be quite similar to one another. On the basis of their descriptions a larval description of the genus is formulated. This, in turn, is compared with and found quite similar to a previously published Preliminary description of mature larvae of the Megachilini based on study of larval representatives of the three genera in the tribe: Megachile, all species of which are pollen-collecting, and Coelioxys and Radoszkowskiana, both of which are cleptoparasitic, usually with Megachile hosts.
International Yearbook of Nephrology 1991
The 1991 International Yearbook of Nephrology is the third in a sueeessful .eries whieh has, as its principal aim, thc presentation of a eomprehensive list of topfes of the greatest current relevanee to elinieal nephrologists. We believe that, by following the subjeets eovered by the Yearbook in the broad field of nephrology, the praetieing nephrologist and nephrologist-in-training ean stay abreast of a number of rapidly advaneing fields. To improve the quality of the Yearbook, we have appointed an Editorial Board to provfde suggestions for topies and authors. Thus, we have invited 58 outstanding nephrologists from around the world (the list of them is included in this issue of the Yearbook)...
Our Native Bees
Our Native Bees is the result of Paige Embry’s yearlong quest to learn more about the forgotten, yet fundamental, native bees of North America.
