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The ontogeny of the cypridid ostracod Eucypris virens (Jurine, 1820) (Crustacea, Ostracoda)

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Abstract

The chaetotaxy (shape, structure and distribution of setae) of appendages and valve allometry during the post embryonic ontogeny of the cyprididine ostracod Eucypris virens are described. It is shown that the basic ontogenetic development of E. virens is very similar to that of other species of the family Cyprididae. During ontogeny, the chaetotaxy shows continual development on all podomeres of the limbs with the exception of the last podomere on the antennulae. The long setae on the exopodite and protopodite of the antennae have a natatory function until the actual natatory setae develop in later instars. Aesthetascs (presumed chemoreceptors) ya and y3 are the first to develop and may have an important function in the first instars. Cyprididae require a pediform limb in the posterior of the body presumably to help them to attach to substrates and this is reflected by the pediform nature of one limb at all times throughout all instars. This study has also shown that the fifth limb is most probably of thoracic origin and hence ostracods have only one pair of maxillae.

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Authors and Affiliations

  1. Geology Dept., University of Leicester, University Road, Leicester, LE1 7RH, U.K.

    Robin J. Smith

  2. Freshwater Biology, Royal Belgian Institute of Natural Sciences, Vautierstraat 29, B-1000, Brussels, Belgium

    Koen Martens

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  1. Robin J. Smith
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  2. Koen Martens
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Correspondence to Koen Martens.

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Smith, R.J., Martens, K. The ontogeny of the cypridid ostracod Eucypris virens (Jurine, 1820) (Crustacea, Ostracoda). Hydrobiologia 419, 31–63 (2000). https://doi.org/10.1023/A:1003985908460

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