The Reproductive Physiology of the Screwworm, Cochliomyia Hominivorax (Diptera: Calliphoridae). I. Oogenesis
- 4 September 1979
- journal article
- research article
- Published by Oxford University Press (OUP) in Journal of Medical Entomology
- Vol. 15 (5-6), 472-483
- https://doi.org/10.1093/jmedent/15.5-6.472
Abstract
Oogenesis in the screwworm fly, Cochliomyia hominivorax, was divided into a series of 10 stages, where the germarium was defined as stage 1, the beginning of yolk formation as stage 4, and the mature egg as stage 10. The volume of the nurse cell nuclei was maximum at stage 6 and then started to decrease, However, maximum cytoplasmic volume of the nurse cells was observed in stage 7 follicles. The nurse cells degenerated during stage 9. Chorion formation started in stage 9 follicles and was completed by stage 10. The number of follicle cells increased during stages 2, 3, and 4 and decreased during stages 6 through 10. The follicle cells over the nurse chamber were squamous during stages 6 through 9. During stages 6 and 7, the follicle cells over the oocyte were columnar; during stage 8, they were cuboidal, and durilig stages 9 and 10, they became elongated. Parous flies could be distinguished from nulliparous flies by the presence of follicle cell residues in the ovarioles, distended ovarioles, and the absence of pupal fat body. Egg development (egg stage vs age) fit the equation LnY = a + bX. Stages 2 and 3 lasted longer than any of the other stages. At 24°C, development of eggs to maturity took 152 h and at 30°C, it took 80 h. As long as mature eggs were present from the 1st cycle, the 2nd cycle did not develop past stage 4, and the 3rd cycle consisted of the germarium. Removal of the ring gland in flies 4 h postemergence resulted in the cessation of the 1st cycle at stage 4.This publication has 9 references indexed in Scilit:
- Physical and Physiological Effects on the Response of Female Screwworms, Cochliomyia Hominivorax (Diptera: Calliphoridae), to Carrion Odors in an Olfactometer1Journal of Medical Entomology, 1979
- Behavior of Sexually Active Male Screwworm Flies1Annals of the Entomological Society of America, 1978
- Behavior and Reproductive Status of Native Female Screwworms Attracted to a Host1Annals of the Entomological Society of America, 1977
- The ovaries, ring gland, and neurosecretion during the second gonotrophic cycle in the housefly, Musca domesticaGeneral and Comparative Endocrinology, 1976
- Oöstatic hormone production in houseflies, Musca domestica, with developing ovariesJournal of Insect Physiology, 1968
- Gonadotrophic Cycles in the Face Fly, Musca autumnalis123Annals of the Entomological Society of America, 1968
- Ovarian development, pheromone production, and mating in the eye gnat, Hippelates collusorJournal of Insect Physiology, 1968
- The Reproductive Biology of Hippelates collusor (Diptera: Chloropidae). II. Gametogenesis1,2Annals of the Entomological Society of America, 1967
- The Reproductive Biology of Hippelates collusor (Diptera: Chloropidae). I. Morphology of the Reproductive Systems, with Notes on Physiological Aging1,2Annals of the Entomological Society of America, 1967