Publication
Title
Spermatophore implantation in **Rossia moelleri** Steenstrup, 1856 (Sepiolidae; Cephalopoda)
Author
Abstract
The small sepiolid cephalopod Rossia moelleri Steenstrup, 1856 transfers sperm by implantation of spermatangia into female tissue. Although this is a common sperm transfer and storage strategy in cephalopods, the mechanism behind implantation of spermatangia is poorly understood. In the lab, we artificially induced the spermatophoric reaction and spermatangia implanted into female tissue. The force necessary to penetrate the mantle was measured using a needle attached to a force transducer. Taking diameter and bluntness factor into account, this force was estimated to be 0.3 N. Analysis of the spermatophoric reaction showed that the maximum force (1.12 μN9.36 μN) produced as a result of acceleration (1.573.59 mm/s2) of the forward moving sperm mass (2.67 mg) was insufficient to be solely responsible for the penetration of the spermatangia into tissue. Scanning electron microscopy revealed no structures that could have facilitated the implantation of the spermatangium. Histological sections of the implanted spermatangium visualized the cement body being orally secreted from the spermatangium, probably facilitating the implantation either by lysis of the surrounding tissue or by acting as a lubricant during implantation. This study shows that the autonomous implantation process of spermatangia of R. moelleri does not have a purely mechanical basis but necessitates an additional, probably chemical mechanism or a combination of these two.
Language
English
Source (journal)
Journal of experimental marine biology and ecology. - Amsterdam
Publication
Amsterdam : 2009
ISSN
0022-0981
Volume/pages
372(2009), p. 75-81
ISI
000265552700010
Full text (Publisher's DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 06.05.2011
Last edited 20.09.2017