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Regional differences in a nematoceran retina (Insecta, Diptera)

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Summary

The compound eye of Psychoda cinerea comprises two types of ommatidia, arranged so as to divide the retina into distinct dorsal and ventral regions. The P-type ommatidium, in the ventral part of the eye, differs fundamentally from the other dipteran ommatidia so far described, and is regarded as a primitive ommatidium. The acone dioptric apparatus is the same in both types, with a spherical lens and four Semper cells, the processes of which expand below the rhabdom to form a ring of pigment sacs. Only the distal region of the rhabdom is surrounded by a continuous ring of screening pigment, formed by 2 primary and 12–16 secondary pigment cells. The highly pigmented retinula cells penetrate the basement membrane proximally at about the level of their nuclei; in this region they are separated from the hemolymph by glial elements. The rhabdomeres R1–6 are fused to form a tube. The two types of ommatidia are defined by the arrangement of the retinula cells R7/8: in the T type the central rhabdomeres are one below the other, in the usual tandem position, whereas in the P type only R8 is central, with R7 in the peripheral ring. In the proximal region of the retina, retinula cells with parallel microvilli in neighboring ommatidia are joined in rows by lateral processes from the R8 cells. All the rhabdomeres are short and not twisted, which suggests that the retinula cells are highly sensitive to direction of polarization. The eye can adapt by a number of retinomotor processes. These findings, together with observations of behavior, imply that the psychodids have well-developed visual abilities.

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Authors and Affiliations

  1. Anatomische Anstalt der Universität, Pettenkoferstr. 11, D-8000, München 2, Federal Republic of Germany

    Peter Seifert

  2. Max-Planck-Institut für Verhaltensphysiologie, D-8131, Seewiesen, Federal Republic of Germany

    Hansjörg Wunderer

  3. Zoologisches Institut der Universität, Luisenstr. 14, D-8000, München 2, Federal Republic of Germany

    Ulrich Smola

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  1. Peter Seifert
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Seifert, P., Wunderer, H. & Smola, U. Regional differences in a nematoceran retina (Insecta, Diptera). Zoomorphology 105, 99–107 (1985). https://doi.org/10.1007/BF00312144

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