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A comparative study of the anatomy and behaviour of the oncomiracidia of the related monogenean gill parasites Kuhnia scombri, K. sprostonae and Grubea cochlear from mackerel, Scomber scombrus

Published online by Cambridge University Press:  11 May 2009

Ian D. Whittington  and
Graham C. Kearn
Ian D. Whittington
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ
Graham C. Kearn
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich, NR4 7TJ
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Abstract

The anatomy and behaviour of the oncomiracidia of Kuhnia scombri, K. sprostonae and Grubea cochlear, related mazocraeid monogeneans from the gill chamber of the mackerel, Scomber scombrus, caught off Plymouth are compared. K. sprostonae and G. cochlear are new records at Plymouth. The most important anatomical difference between these larvae is that those of Kuhnia spp. possess a pair of pigment-shielded eyes which are lacking in G. cochlear. The freshly hatched larvae of Kuhnia spp. are strongly photopositive but this response wanes after about 1 h in K. scombri and 1–5 h in K. sprostonae. No response to light was detected in larvae of G. cochlear. Most older larvae of Kuhnia spp. and of G. cochlear swim continuously upwards and downwards, even in ‘darkness’, indicating an alternation between positive and negative geotropism. The larvae of Kuhnia spp. possess angular cells (?) of unknown function close to the pharynx. The larvae of all three species contain prominent anterior glands and lipid droplets; the latter are depleted during their long free-swimming lives (up to 36 h in Kuhnia spp. at 13–14°C).

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 70 , Issue 1 , February 1990 , pp. 21 - 32
Copyright
Copyright © Marine Biological Association of the United Kingdom 1990

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