Summary
The photoreceptors ofPogaina suecica correspond to the type of pigment cup ocelli. Each eye consists of one cup cell and three sensory cells. The most conspicuous differentiations of these eyes are lens elements formed by giant mitochondria densely filled with homogeneous electron-dense material. From electron microscopical findings available to date it is hypothesized that mitochondrial lensing might be an autapomorphy of a taxon comprising the Provorticidae Kirgisellinae, Dalyelliidae and Graffillidae groups which are ascribed to the paraphyletic “Dalyellioida”.
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Abbreviations
- l 1–3 :
-
lenses
- npc :
-
nucleus of the pigment cell
- pc :
-
pigment cell
- pg :
-
pigment granule
- rh :
-
rhabdomeres
- sc 1–3 :
-
sensory cells
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Sopott-Ehlers, B. Photoreceptors with mitochondrial lenses inPogaina suecica (Plathelminthes, Rhabdocoela). Zoomorphology 112, 11–15 (1992). https://doi.org/10.1007/BF01632990
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DOI: https://doi.org/10.1007/BF01632990