Acta Parasitologica

, Volume 56, Issue 4, pp 371-376

First online:

Spermatophores in Dermopristis cairae Whittington et Kearn, 2011 (Monogenea, Microbothriidae)

  • Graham C. KearnAffiliated withSchool of Biological Sciences, University of East Anglia Email author 
  • , Ian D. WhittingtonAffiliated withMonogenean Research Laboratory, Parasitology Section, The South Australian MuseumMarine Parasitology Laboratory, School of Earth and Environmental Sciences (DX 650 418), The University of AdelaideAustralian Centre for Evolutionary Biology and Biodiversity, The University of Adelaide
  • , Richard Evans-GowingAffiliated withSchool of Biological Sciences, University of East Anglia

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Spermatophores are described in the microbothriid monogenean Dermopristis cairae from the giant shovel-nosed ray, Glaucostegus typus (Elasmobranchii, Rhinobatidae). Each spermatophore consists of a fusiform capsule containing sperm and a hollow stalk. The proximal ends of the stalks of fully formed spermatophores were open and located in a recess on the ventral surface close to, but not inside, the vagina and the male reproductive opening. Three adult parasites carried spermatophores attached externally to the ventral surface. One individual carried 3 spermatophores and 2 others a single spermatophore. In addition, in 2 adults, short lengths of what appeared to be stalk remnants were observed attached near the reproductive openings. With regard to spermatophore exchange, the evidence in support of the following 2 possibilities is discussed. (1) Adult specimens of D. cairae carrying fully formed spermatophores ventrally are recipients not donors, having received their spermatophores singly during mating events. (2) Spermatophore carrying adults are donors, their spermatophores being freshly made and on offer to a potential mate. The evidence points to the first of these alternatives as the most likely but this is not conclusive and requires observations on mating between living parasites.


Platyhelminthes Monogenea Microbothriidae Dermopristis cairae Glaucostegus typus spermatophores