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The eye of the soldier beetle Chauliognathus pulchellus (Cantharidae)

Horridge, George Adrian; Giddings, C.; Wilson, M.

Description

The soldier beetle eye is unusual in having large optically isotropic corneal cones which project inwards from a thick isotropic cornea. Refraction is mainly at the corneal surface. Calculation shows that the first focal plane is near the tip of the cone, from which the optical pathway continues as a crystalline tract. At the distal end of the crystalline tract, 3 µm in diameter, the four cone cells enclose the proximal tip of the corneal cone; at the proximal end they enclose the distal tip of...[Show more]

dc.contributor.authorHorridge, George Adrian
dc.contributor.authorGiddings, C.
dc.contributor.authorWilson, M.
dc.date.accessioned2019-09-23T00:00:23Z
dc.identifier.issn0962-8452
dc.identifier.urihttp://hdl.handle.net/1885/170626
dc.description.abstractThe soldier beetle eye is unusual in having large optically isotropic corneal cones which project inwards from a thick isotropic cornea. Refraction is mainly at the corneal surface. Calculation shows that the first focal plane is near the tip of the cone, from which the optical pathway continues as a crystalline tract. At the distal end of the crystalline tract, 3 µm in diameter, the four cone cells enclose the proximal tip of the corneal cone; at the proximal end they enclose the distal tip of a long fused rhabdom rod. The eye is remarkable in that there are two classes of retinula cells; four cells contribute to the long thin axial rhabdom, 2 µm in diameter and 120 µm long, and the other four cells form two rounded rhabdoms, 10 x 4 µm in cross-section and 20 µm deep, which lie to one side of the optical axis. The physiological properties of individual retinula cells were measured by intracellular recording. The retinula cells are of three spectral types with peaks near 360, 450 and 520–530 nm. Except by the criterion of spectral sensitivity, the retinula cells sampled could not be sorted into more than one class. The measured value of the acceptance angle, near 3° in the dark-adapted state, is consistent with the hypothesis that all sampled cells were of the anatomical type that participate in the central rhabdom rod. A calculation of the theoretical field size of individual retinula cells from measurements of refractive index and lens dimensions predicts that cells which participate in the central rhabdom will have acceptance angles near 3°. The conclusion, therefore, is that only one anatomical type of cell has so far been sampled.
dc.format.extent23 pages
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherRoyal Society
dc.rights© Royal Society
dc.sourceProceedings of the Royal Society of London B: Biological Sciences
dc.subjectsoldier beetle
dc.subjecteye
dc.subjectanatomy
dc.subjectisotropic corneal cones
dc.subjectretinula cells
dc.subjectrhabdom
dc.titleThe eye of the soldier beetle Chauliognathus pulchellus (Cantharidae)
dc.typeJournal article
local.identifier.citationvolume203
dc.date.issued1979-01-15
local.publisher.urlhttps://royalsociety.org/
local.type.statusPublished Version
local.contributor.affiliationHorridge, George Adrian, Division of Biomedical Science and Biochemistry, CoS Research School of Biology, The Australian National University
local.contributor.affiliationGiddings, C., Division of Biomedical Science and Biochemistry, CoS Research School of Biology, The Australian National University
local.contributor.affiliationWilson, M., Division of Biomedical Science and Biochemistry, CoS Research School of Biology, The Australian National University
local.description.embargo2037-12-31
local.identifier.essn1471-2954
local.bibliographicCitation.issue1153
local.bibliographicCitation.startpage361
local.bibliographicCitation.lastpage378
local.identifier.doi10.1098/rspb.1979.0003
CollectionsANU Research Publications

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