Ultrastructure of oogenesis in an ovoviviparous and an oviparous freshwater snail (caenogastropoda)

Alan N. Hodgson*, Frida Ben-Ami, Joseph Heller

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The ultrastructural features of oogenesis are described in an ovoviviparous (Melanoides tuberculata) and an oviparous (Melanopsis buccinoidea), freshwater snail. Yolk formation in both species appears to be primarily autosynthetic. In M. tuberculata protein yolk, formed by the endoplasmic reticulum and Golgi bodies, appears first. As vitellogenesis progresses, the ooplasm not only accumulates two types (based on their morphological appearance) of large protein yolk granules and quantities of glycogen, but also some lipid. By contrast in M. buccinoidea early stages of vitellogenesis involve the formation of large amounts of lipid (the main storage product in these eggs). Mid- to late-stage oocytes begin to accumulate one type of protein yolk granule and glycogen. In both species follicle cells are closely associated with the developing oocytes and it is suggested that they play an essential role in oocyte nutrition.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalInvertebrate Reproduction and Development
Volume41
Issue number1-3
DOIs
StatePublished - 2002
Externally publishedYes

Keywords

  • Follicle cells
  • Gastropoda
  • Lipid
  • Ovarian structure
  • Vitellogenesis

Fingerprint

Dive into the research topics of 'Ultrastructure of oogenesis in an ovoviviparous and an oviparous freshwater snail (caenogastropoda)'. Together they form a unique fingerprint.

Cite this