QUT ePrints

One-Sided Ejaculation of Echidna Sperm Bundles

Johnston, Steve D., Smith, Brett, Pyne, Michael, Stenzel, Deborah J., & Holt, William V. (2007) One-Sided Ejaculation of Echidna Sperm Bundles. The American Naturalist, 170(6), E162-E164.

View at publisher

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.

Impact and interest:

7 citations in Scopus
Search Google Scholar™
4 citations in Web of Science®

Citation countsare sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

802 since deposited on 30 Jul 2008
114 in the past twelve months

Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 14228
Item Type: Journal Article
Keywords: short, beaked echidna, ejaculation, penis, sperm, Monotremata, sperm bundles, sperm competition
DOI: 10.1086/522847
ISSN: 0003-0147
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > PHYSIOLOGY (060600) > Animal Physiology - Systems (060603)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2007 University of Chicago Press
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 30 Jul 2008
Last Modified: 29 Feb 2012 23:39

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page