Polar Biology

, Volume 17, Issue 4, pp 384–388

Gonopore development and sex change in the Antarctic shrimp Chorismus antarcticus (Caridea: Hippolytidae)

  • Piero Mascetti
  • Rodrigo Fernandez de la Reguera
  • Luis Albornoz
  • Silvia Oyarzún
  • Matthias Gorny
  • Ingo Wehrtmann
ORIGINAL PAPER

DOI: 10.1007/PL00013380

Cite this article as:
Mascetti, P., de la Reguera, R., Albornoz, L. et al. Polar Biol (1997) 17: 384. doi:10.1007/PL00013380

Abstract

Chorismus antarcticus is the only protandrous hermaphrodite decapod species found on the Antarctic continental shelves. The morphological structures of the male and female gonopores were described and used to determine sex and to fix the size range at which the transition from male to female takes place. The parallel occurrence of male and female gonopores was found in all specimens. The presence of open gonopore flaps at both the third and fifth pair of pereiopods in individuals between 9 and 12 mm of carapace length (CL) is discussed as the morphological indicator of sex change. Few females occurred from 9 mm CL onwards, whereas all shrimps larger than 13 mm CL only had open female gonopores. This size corresponds exactly with the CL at which onset of oocyte development and female gonad production starts. Secondary sexual characters, the gonopore structures, seem to allow an accurate prediction of the size range at which hermaphrodite caridean decapods change sex.

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Piero Mascetti
    • 1
  • Rodrigo Fernandez de la Reguera
    • 1
  • Luis Albornoz
    • 1
  • Silvia Oyarzún
    • 2
  • Matthias Gorny
    • 2
  • Ingo Wehrtmann
    • 1
  1. 1.Instituto de Zoologia “Ernst F. Killian”, Universidad Austral de Chile, Casilla 567 Valdivia, Chile fax: +56 63 221315CL
  2. 2.Instituto de la Patagonia, Universidad de Magallanes, Avda Bulnes, 01890 Punta Arenas, Chile fax: +56 63 212973CL