Hostname: page-component-586b7cd67f-t7czq Total loading time: 0 Render date: 2024-11-28T05:08:35.798Z Has data issue: false hasContentIssue false
  • English
  • Français

FINE EXTERNAL MORPHOLOGY OF THE EGGS OF EPHORON ALBUM (SAY) AND EPHORON SHIGAE (TAKAHASHI) (EPHEMEROPTERA, POLYMITARCYIDAE)

Published online by Cambridge University Press:  31 May 2012

Elda Gaino  and
John Flannagan
Elda Gaino
Affiliation:
Istituto di Zoologia dell' Università, Via Elce di Sotto, 06100 Perugia, Italy
John Flannagan
Affiliation:
Freshwater Institute, Central and Arctic Region, Canada Department of Fisheries and Oceans, 501 University Crescent, Winnipeg, Manitoba, Canada R3T 2N6
Get access Rights & Permissions [Opens in a new window]

Abstract

Eggs of Ephoron album and E. shigae were studied by scanning electron microscopy. They showed similar structure of both polar cap and micropyles, but had different chorionic patterns. Micropyles were of the tagenoform type and, whereas in most mayflies thev are equatorial or subequatorial, in these eggs they were located close to the apical pole. The chorion was smooth in E. album and had a large mesh reticulation in E. shigae. The effect of water in causing the cap to swell and expand was tested by fixing eggs of E. album at different lime intervals after their mechanical deposition in water. The polar cap was a composite apparatus, consisting of finger-like projections with slight terminal enlargements, which arose from a common hood. The latter was connected via a thread bundle to the chorionic surface. In turn, the thread bundle arose from a chorionic collar located immediately underneath the hood. Each finger-like projection was composed of a large number of thin threads packed together, each ending in a small terminal knob. The function of the polar cap was discussed in relation to egg–water interaction.

Résumé

Les oeufs d’Ephoron album et d’Ephoron shigae ont été étudiés au microscope électronique à balayage. La structure de la calotte polaire et des micropyles de l’oeuf est semblable chez les deux expèces, mais la structure du chorion n’est pas la même. Les micropyles sont de type tagénoforme et sont situés près du pôle apical, contrairement à ce qui prévaut chez les autres éphémères où ils sont généralement en position équatoriale ou subéquatoriale. Le chorion est lisse chez E. album alors qu’il comporte une réticulation à larges mailles chez E. shigae. L’effet de l’eau sur le renflement et l’expansion de la calotte a été éprouvé par fixation des oeufs d’E. album à divers intervalles après leur plongée dans l’eau. La calotte polaire est un appareil complexe composé de prolongements digitiformes légèrement renflés dans leur partie terminale et issus d’une coiffe commune. Celle-ci est reliée par un faisceau de filamentes à la surface du chorion. Le faisceau de filaments est lui-même rattaché à un collet chorionique situé directement sous la coiffe. Chaque prolongement digitiforme est composé d’un grand nombre de filaments minces, serrés les uns sur les autres, chacun portant une petite massue terminale. Le rôle de la calotte polaire est examiné en relation avec l’action de l’eau sur l’oeuf.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 127 , Issue 4 , August 1995 , pp. 527 - 533
Copyright
Copyright © Entomological Society of Canada 1995

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Alba-Tercedor, J., and Sowa, R.. 1987. New representatives of the Rhithrogena diaphana-group from Continental Europe, with a redescription of R. diaphana Navas, 1917 (Ephemeroptera: Heptageniidae). Aquatic Insects 9: 65–83.CrossRefGoogle Scholar
Bengtsson, S. 1913. Undersökningar öfver äggen hos Ephemeriderna. Entomologisk Tidskrift 34: 271–320.Google Scholar
Degrange, C. 1960. Recherches sur la reproduction des Ephéméroptères. Travaux du Laboratoire de Hydrobiologie et Pisciculture de l'Université de Grenoble 50/51: 7–193.Google Scholar
Edmunds, G.F. Jr., 1973. Some critical problems of family relationships in the Ephemeroptera. pp. 145–154 in Peters, W.L., and Peters, J.G. (Eds.), Proceeding 1st International Conference on Ephemeroptera. E. J. Brill, Leiden. 312 pp.Google Scholar
Gaino, E., and Bongiovanni, E.. 1992 a. Scanning electron microscopy of the eggs of Palingenia longicauda (Olivier) (Ephemeroptera: Palingeniidae). International Journal of Insect Morphology and Embryology 22: 41–48.CrossRefGoogle Scholar
Gaino, E., and Bongiovanni, E.. 1992 b. Comparative morphology of Epithemata (polar chorionic structures) in the eggs of Ephemerella ignita (Ephemeroptera: Ephemerellidae). Transactions of the American Microscopical Society 111: 255–265.Google Scholar
Gaino, E., and Mazzini, M.. 1984. Scanning electron microscope study of the eggs of some Habrophlebia and Habroleptoides species (Ephemeroptera, Leptophlebiidae). pp. 193–202 in Landa, V., Soldán, T., and Tonner, M. (Eds.), Proceeding 4th International Conference on Ephemeroptera. Bechynè. Czechoslovak Academy of Sciences. 345 pp.Google Scholar
Gaino, E., and Mazzini, M.. 1987. Scanning electron microscopy of the egg attachment structures of Electrogena zebrata (Ephemeroptera: Heptageniidae). Transactions of the American Microscopical Society 106: 114–119.CrossRefGoogle Scholar
Gaino, E., and Mazzini, M.. 1988. Fine structure of the chorionic projections of the egg of Rhithrogena kimminsi Thomas (Ephemeroptera: Heptageniidae) and their role in egg adhesion. International Journal of Insect Morphology and Embryology 17: 113–120.CrossRefGoogle Scholar
Gaino, E., Mazzani, M., Degrange, C., and Sowa, R.. 1989. Etude en microscopie à balayage des oeufs de quelques espèces de Rhithrogena Eaton groupe alpestris (Ephemeroptera, Heptageniidae). Vie et Milieu 39: 219–229.Google Scholar
Gaino, E., Mazzini, M., and Sartori, M.. 1993. Comparative analysis of the chorionic pattern in Habroleptoides species (Ephemeroptera, Leptophlebiidae). Bollettino di Zoologia 60: 155–162.CrossRefGoogle Scholar
Karnovsky, M. J. 1965. A formaldehyde-glutaraldehyde fixative of high osmolality for use in electron microscopy. Journal of Cell Biology 27: 137A–138A.Google Scholar
Kosova, A.A. 1967. A contribution on the ecology of the mayfly Palingenia sublongicauda Tshern. in the Volga delta. Zoologicheskii Zhurnal 46: 1856–1859.Google Scholar
Koss, R.W. 1968. Morphology and taxonomic use of Ephemeroptera eggs. Annals of the Entomological Society of America 61: 696–721.CrossRefGoogle Scholar
Koss, R.W., and Edmunds, G.F. Jr., 1974. Ephemeroptera eggs and their contribution to phylogenetic studies of the order. Zoological Journal of the Linnean Society 55: 267–349.CrossRefGoogle Scholar
Malzacher, P. 1982. Eistrukturen europäischer Caenidae (Insecta, Ephemeroptera). Stuttgarter Beitraege zur Naturkunde Serie A 356: 1–15.Google Scholar
Malzacher, P. 1986. Caenidae aus dem Amazonasgebiet (Insecta, Ephemeroptera). Spixiana 9: 83–103.Google Scholar
McCafferty, W.P. 1990. Chapter 2. Ephemeroptera. pp. 20–50in Grimaldi, D.A. (Ed.), Insects from the Santana Formation, Lower Cretaceous, of Brazil. Bulletin of the American Museum of Natural History 195: 191 pp.Google Scholar
McCafferty, W.P. 1991. Toward a phylogenetic classification of the Ephemeroptera (Insecta): A commentary on systematics. Annals of the Entomological Society of America 84(4): 343–360.CrossRefGoogle Scholar
Peters, W.L., and Campbell, I.C.. 1991. Ephemeroptera (Mayflies). pp. 279–293in Naumann, I.D. et al. , (Eds.), The Insects of Australia. Vol. 1, CSIRO, 2nd Edition of the Division of Entomology. Melbourne University Press, Melbourne. 542 pp.Google Scholar
Provonsha, A.V. 1990. A revision of the genus Caenis in North America (Ephemeroptera: Caenidae). Transactions of the American Entomological Society 116(4): 801–884.Google Scholar
Rosciszewska, E. 1991. Ultrastructural and histochemical studies of egg capsules of Perla marginata (Panzer, 1799) and Dinocras cephalotes (Curtis, 1827) (Plecoptera: Perlidae). International Journal of Insect Morphology and Embryology 20: 189–203.Google Scholar
Sartori, M., and Gillies, M.T.. 1990. Further records of mayflies (Insecta: Ephemeroptera) from the Arabian Peninsula. Leptophlebiidae and Baetidae. Fauna of South Arabia 11: 10–17.Google Scholar
Watanabe, N.C., and Takao, S.. 1991. Effect of a low temperature period on the egg hatching of the japanese burrowing mayfly, Ephoron shigae. pp. 439–445in Alba-Tercedor, J., and Sanchez-Ortega, A. (Eds.), Overview and Strategies of Ephemeroptera and Plecoptera. Sandhill Crane Press, Gainsville, FL. 588 pp.Google Scholar