Oogenesis in Macrotrachela quadricornifera (Rotifera, Bdelloidea) - I. Germarium eutely, karyotype and DNA content

Manuela Pagani, Claudia Ricci, Carlo Alberto Redi

Research output: Contribution to journalArticlepeer-review

Abstract

Bdelloids reproduce via obligate apomictic parthenogenesis. Oogenesis occurs through two subsequent equational divisions, with the extrusion of two polar bodies. Although the morphology of the bdelloid reproductive apparatus has been previously described, the eutely of the germarium has never been investigated. We studied oogenesis in Macrotrachela quadricornifera by assessing: (1) the constancy of oocyte number, (2) chromosome number and size, and (3) the DNA content of oocytes and blastomeres. Oocyte number at birth is constant and determines maximal fertility. We found a chromosome number of 5, in which two homologous pairs can be recognized. The genome size of the species is 0.75 picograms.

Original languageEnglish
Pages (from-to)225-230
Number of pages6
JournalHydrobiologia
Volume255-256
Issue number1
DOIs
Publication statusPublished - Apr 1993

Keywords

  • bdelloid rotifers
  • chromosomes
  • DNA content
  • karyotype
  • oocytes

ASJC Scopus subject areas

  • Water Science and Technology
  • Pollution
  • Environmental Science(all)
  • Oceanography
  • Aquatic Science

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