Skip to main content

Insertion and withdrawal of extremely elongated genitalia: a simple mechanism with a highly modified morphology in the leaf beetle, Lema coronata

Buy Article:

$51.00 plus tax (Refund Policy)

Abstract:

Complicated genital structures are widely known in many animals. It is assumed that an increasing morphological complexity of genital structures would also increase the difficulty of inserting and withdrawing the structures. We examined the insertion and withdrawal mechanisms of extremely elongated genitalia in the Japanese leaf beetle, Lema (Lema) coronata. Insertion and withdrawal processes are completed quickly. Investigation of genital morphology showed that there are no protractor or retractor muscles attached to the elongated part. Instead, the elongated part is tightly enveloped by a membrane. Because of the close fit between the elongated part and its surrounding membrane, eversion of the membrane allows for insertion of the elongated part, and retraction of the membrane induces withdrawal of the elongated part. This surrounding membrane makes it possible to store the median ejaculatory guide (MEG) in a small genital cavity, with the basal portion of the elongated part extending internally against the entrance. This unusual character state is observed only in members of the subgenus Lema, which also have the elongated part. This condition can be considered to be a preadaptation for extreme elongation of genitalia. © 2010 The Linnean Society of London, Biological Journal of the Linnean Society, 2010, 99, 512–520.

Keywords: Chrysomelidae; Criocerinae; copulation; endophallus; internal sac; preadaptation

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1095-8312.2009.01376.x

Publication date: 2010-03-01

  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more