Format

Send to:

Choose Destination
See comment in PubMed Commons below
Am Nat. 2007 Dec;170(6):E162-4. doi: 10.1086/522847.

One-sided ejaculation of echidna sperm bundles.

Author information

  • 1School of Animal Studies, University of Queensland, Gatton, Queensland 4343, Australia. s.johnston1@uq.edu.au

Abstract

We report for the first time an unusual ejaculatory mechanism in the short-beaked echidna in which each side of the bilaterally symmetrical, rosettelike glans penis is used alternately, with the other being shut down. This is unparalleled in mammals but is reminiscent of the use of hemipenes in squamate reptiles, providing further reproductive evidence of a sauropsidian lineage in the Monotremata. Further, we describe the occurrence of motile sperm bundles in ejaculated echidna semen and provide scanning electron micrographs of their morphology. Sperm bundling appears to confer increased sperm motility, which may provide the potential for sperm competition between males.

PMID:
18171162
[PubMed - indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for University of Chicago Press
    Loading ...
    Write to the Help Desk