caa a22 4500 388093331 CHVBK 20180307125257.0 cr unu---uuuuu 161130e199906 xx s 000 0 eng 10.4039/Ent131323-3 doi S0008347X00009949 pii (NATIONALLICENCE)cambridge-10.4039/Ent131323-3 Tourneur Jean-Claude Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8 OOGENESIS IN THE ADULT OF THE EUROPEAN EARWIG FORFICULA AURICULARIA (DERMAPTERA: FORFICULIDAE) [Elektronische Daten] [Jean-Claude Tourneur] Oogenesis and associated ovarian development were studied from the onset of adult eclosion to oviposition in the European earwig, Forficula auricularia L., by examining histological sections of ovarioles and whole mounts of ovaries. Each pair of ovaries contains a mean of 85.4 ovarioles. Chronologically, oogenesis has been divided into four phases, adult emergence, previtellogenesis, vitellogenesis, and choriogenesis, each described here in detail. The mean size of the basal follicle increases from 15 μm at time of adult emergence to 0.9 mm at time of choriogenesis, and the oocyte to trophocyte ratio increases from 1.0 to 4, with a minimum of 0.5 at the onset of previtellogenesis. The oocyte to trophocyte ratio of 0.7 marks the onset of vitellogenesis, which lasts about three times (60 days) as long as previtellogenesis. The extended vitellogenesis is still under way when females bury themselves in the ground, in October, in the Montréal area. Copyright © Entomological Society of Canada 1999 The Canadian Entomologist Cambridge University Press 131/3(1999-06), 323-334 0008-347X 131:3<323 1999 131 TCE https://doi.org/10.4039/Ent131323-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131323-3 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Tourneur Jean-Claude Département des sciences biologiques, Université du Québec à Montréal, C.P. 8888, Succursale Centre-ville, Montréal, Québec, Canada H3C 3P8 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/3(1999-06), 323-334 0008-347X 131:3<323 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge