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File:Revue suisse de zoologie. (1925) (14780434632).jpg

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Identifier: revuesuissedezoo3219schw (find matches)
Title: Revue suisse de zoologie.
Year: 1893 (1890s)
Authors: Schweizerische Zoologische Gesellschaft Muséum d'histoire naturelle de Genève
Subjects: Zoology Natural history
Publisher: Genève, Kundig
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: BHL-SIL-FEDLINK

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de faire autre chose que des hypo-thèses pour expliquer lorigine des anomalies observées chez cesanimaux. On peut attribuer lanomalie: 1. A une mutation qui entraînerait la stérilité et, consé-cutivement, le gigantisme. 2. A une castration parasitaire. Mais cette inter-prétation est peu probable, car dans aucun cas je nai rencontrétrace de parasite, en aucune partie du corps. 3. Il se pourrait enfin que létat anormal soit la conséquencedun déséquilibre chromosomique (état triploïdepar exemple provenant dun accident ou dun croisement entreespèces ou entre races bivalentes et monovalentes. Malheureusement,je nai pu observer aucune caryocinèse. Des mensurations de noyaux 1 Ou un état triploïde partiel, comparable à celui qui chez Drosophilaampelophila, détermine la stérilité. HELIX PO M A TI A 213 au repos semblent indiquer que la taille maxima est un peu plusgrande chez les anormaux que chez les normaux, mais les résultatsne paraissent pas suffisamment concluants.
Text Appearing After Image:
Tig. 3. — Coupes à travers le pénis dun Escargot normal (N) et dun animalà organes génitaux atrophiés (A). On voit outre la différence de taille,une dissemblance de forme. Les noyaux paraissent beacoup plus densesdans le pénis danormal, aussi bien dans le tissus conjonctif que danslépithélium. REVUE SUISSE DE ZOOLOGIEVol. 32, no 17. — Octobre 1925. 215 Les types dHyménoptères de Tournier du Muséum dHistoire naturelle de Genève, I. Genre Pedinaspis Kohi. PAR G. MONTET. avec 14 figures dans le texte. Sustera (1912) semble navoir tenu compte, dans sa diagnosedu genre Pedinaspis Kohi, que des espèces les plus caractéristiques,dont la femelle a un chaperon étroit et tout à fait plat, et le mâle,une plaque sous-génitale à bords relevés. Banks (1919) mentionneaussi, comme caractéristique du genre, le pronotum plus long quele mésonotum. Des neuf espèces que nous avons eues sous les yeux, P. plicatus(Costa), bucephalus (Tourn.) et alligatus (Tourr..) possèdent seul

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t. 32 (1925)
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29 July 2014

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