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Alterazioni del metabolismo e del comportamento in stipiti aposimbiotici di Blaberus cranifer Burmeister (Blattaria, Blaberidae)
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Valutazione comparativa del comportamento dei batteri endosimbionti nel corso dello sviluppo embrionale di due specie di Blattaria (Periplaneta americana L.: Blattidae e Blattella germanica L.: Blattellidae)
No full textPATTERN OF BACTERIOCYTE FORMATION IN PERIPLANETA AMERICANA (L.) (BLATTARIA: BLATTIDAE)
No full textIn the embryos of Periplaneta americana CL.) (Blattaria : Blattidae), bacterial symbionts, together with vitellophages, fonn a mycetomic structure inside the deutoplasm; this regresses between the 15th and 16th day after deposition ofthe ootheca. In tms article we describe the migration of bacteria across the wall of the midgut from the mycetorne, and the topographic distribution of pre-bacteriocyte cells. We also Tepori that the pre-bacteriocytes are present only on the lateral surface of the
internaI abdormnal fat bodies. We discuss the possible embryological origin and evolution of these cells, and put forward the hypothesis that pre-bacteriocytes are derived from oenocytes activated to perforro phagocytosis
Localizzazione topografica dei prebatteriociti durante lo sviluppo embrionale di Periplaneta americana L. (Blattaria: Blattidae)
No full textTopographic relationship between the fat body and bacteriocytes in the early embryonic stages of two Blattaria species
No full textDuring embryonic development tbe pre-bacterlocytes of Periplaneta americana and BlatteUa germanica have dlfferent topograph1c localizations on the abdominal fat bodies. At the
time of phagocytosis of the bacterial symbionts, while in Periplaneta americana the pre-bacteriocytes are arranged on the dorsal position and on part of the side walls of the internal fat bodies. in Blattella germanica theyare localized on their median ventral surface. Owing to this difference two hypotheses - which are here discussed - are put forward, regarding the migration of
the bacterial symbionts from the deutoplasm to the pre-bacteriocytes.
KEYWORDS: Periplaneta americana; Blattella germanica: Bacteriocytes
Mortality and tissue damage by heavy metal contamination in the German cockroach, Blattella germanica (Blattaria, Blattellidae)
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