Summary
The dioptric apparatus of the lateral eyes of the scorpion, Androctonus austrails, consists of a cuticular lens, but lacks a vitreous body. The retina is formed by (1) retinula cells displaying a contiguous network of rhabdoms; (2) arhabdomeric cells bearing a distal dendrite that contacts retinula cells via numerous projections and ends before the rhabdomere of the retinula cells; (3) pigment cells that ensheath retinula and arhabdomeric cells with the exception of the contact regions; and (4) neurosecretory fibres possibly originating in the supraesophageal ganglion. The ratio of the number of retinula to arhabdomeric cells is determined to be close to 2 ∶ 1 in the three larger anterolateral eyes, in contrast to the median eyes where the ratio is 5 ∶ 1.
The construction of the dioptric apparatus as well as the anatomy of the retina imply that in the lateral eyes of Androctonus australis visual acuity is reduced. A certain degree of spatial discrimination, however, may be retained by the presence of a relatively high number of arhabdomeric cells. It is suggested that the lateral eyes of A. australis mainly function as light detectors, e.g., for Zeitgeber stimuli.
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References
Angermann, H.: Über Verhalten, Spermatophorenbildung und Sinnesphysiologie von Euscorpius italicus und verwandten Arten. Z. Tierpsychol. 14, 276–302 (1957)
Bedini, C.: Fine structure of the eyes of Euscorpius carpathicus L. (Arachnida Scorpiones). Arch. Ital. Biol. 105, 361–378 (1967)
Belmonte, C., Stensaas, L.J.: Repetitive spikes in photoreceptor axons of the scorpion eye. Invertebrate eye structure and tetrodotoxin. J. Gen. Physiol. 66, 649–655 (1975)
Blest, A.D.: The rapid synthesis and destruction of photoreceptor membrane by a dinopid spider: a daily cycle. Proc. R. Med. Soc. Lond. B. 200, 463–483 (1978)
Carricaburu, P.: Dioptrique oculaire du scorpion Androctonus austratis. Vision Res. 8, 1067–1072 (1968)
Eguchi, E.: Fine structure and spectral sensitivities of retinular cells in the dorsal sector of compound eyes in the dragonfly Aeschna. Z. Vergl. Physiol. 71, 201–208 (1971)
Fahrenbach, W.H.: The visual system of the horseshoe crab Limulus polyphemus. Int. Rev. Cytol. 41, 285–349 (1975)
Fleissner, G.: Circadiane Adaptation und Schirmpigmentverlagerung in den Sehzellen der Medianaugen von Androctonus australis L. (Buthidae, Scorpiones). J. Comp. Physiol. 91, 399–416 (1974)
Fleissner, G.: Scorpion lateral eyes: extremely sensitive receptors of Zeitgeber stimuli. J. Comp. Physiol. 118, 101–108 (1977a)
Fleissner, G.: The absolute sensitivity of the median and lateral eyes of the scorpion Androctonus australis L. (Buthidae, Scorpiones). J. Comp. Physiol. 118, 109–120 (1977b)
Fleissner, G., Schliwa, M.: Neurosecretory fibres in the median eyes of the scorpion, Androctonus australis L. Cell Tissue Res. 178, 189–198 (1977)
Fleissner, G., Siegler, W.: Arhabdomeric cells in the retina of the median eyes of the scorpion. Naturwissenschaften 65, 210 (1978)
Jones, C., Nolte, J., Brown, J.E.: The anatomy of the median ocellus of Limulus. Z. Zellforsch. 118, 297–309 (1971)
Mollenhauer, H.H.: Plastic embedding mixtures for use in electron microscopy. Stain Technol. 39, 111–114 (1964)
Reynolds, E.S.: The use of lead citrate at high pH as an electron-opaque stain in electron microscopy. J. Cell Biol. 17, 208–212 (1963)
Ruthmann, A.: Methoden der Zellforschung. Stuttgart: Kosmos Verlag 1966
Scheuring, L.: Die Augen der Arachnoideen. I. Die Augen der Scorpioniden. Zool. Jb. Abt. Anat. Ontog. 33, 533–588 (1913)
Schliwa, M., Fleissner, G.: Efferente neurosekretorische Fasern in den Medianaugen und im Sehnerv des Skorpions Androctonus australis. Verh. Dtsch. Zool. Ges. 1977, 230. Stuttgart: G. Fischer Verlag 1977
Schliwa, M., Fleissner, G.: Arhabdomeric cells of the median eye retina of scorpions. I. Fine structural analysis. J. Comp. Physiol. 130, 265–270 (1979)
Schönenberger, N.: The fine structure of the compound eye of Squilla mantis (Crustacea, Stomatopoda). Cell Tissue Res. 176, 205–233 (1977)
Uehara, A., Toh, Y., Tateda, H.: Fine structure of the eyes of orb weavers, Argiope amoena L. Koch (Aranea: Argiopidae). Cell Tissue Res. 186, 435–452 (1978)
Weibel, E.: Stereologic principles for morphometry in electron microscopic cytology. Int. Rev. Cytol. 26, 235–324 (1969)
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Schliwa, M., Fleissner, G. The lateral eyes of the scorpion, Androctonus australis . Cell Tissue Res. 206, 95–114 (1980). https://doi.org/10.1007/BF00233611
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DOI: https://doi.org/10.1007/BF00233611