Jump to ContentJump to Main Navigation
The Evolution of Organ Systems$
Users without a subscription are not able to see the full content.

Andreas Schmidt-Rhaesa

Print publication date: 2007

Print ISBN-13: 9780198566687

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198566687.001.0001

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 23 January 2021

Gametes (Spermatozoa)

Gametes (Spermatozoa)

(p.262) CHAPTER 14 Gametes (Spermatozoa)
The Evolution of Organ Systems

A. Schmidt-Rhaesa

Oxford University Press

Although spermatozoa have no organ system, they are the product of organ systems and are of enormous evolutionary importance. Spermatozoa typically possess an acrosome, a nucleus, mitochondria, and a cilium, but these compartments can vary considerably in their shape, arrangement, number, or by being absent. There is a general correlation between external fertilization and the so-called round-headed spermatozoon. In connection with the various modes of modified external and internal fertilization, spermatozoa change their shape to aciliary, filiform, spirally coiled, and others. An evolution from a round-headed to a derived spermatozoon is likely, but some exceptions are possible.

Keywords:   spermatozoon, external fertilization, internal fertilization, round-headed spermatozoon, derived spermatozoon

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .