File:Britannica_1911_Arthropoda_-_Crustacea_and_Hexapoda_compound_eye_derivation.png
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DescriptionBritannica 1911 Arthropoda - Crustacea and Hexapoda compound eye derivation.png |
Diagram to show the derivation of the unit or “ommatidium” of the compound eye of Crustacea and Hexapoda, C, from a simple monomeniscous monostichous eye resembling the lateral eye of a scorpion, A, or the unit of the compound lateral eye of Limulus. |
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Date | published 1911 | ||||
Source | Encyclopædia Britannica (11th ed.), v. 2, 1911, p. 678 | ||||
Author | Edwin Ray Lankester, modified from Watase, “On the Morphology of the Compound Eyes of Arthropods,” Studies from the Biol. Lab. of the Johns Hopkins University, vol. iv. pp. 287-334 | ||||
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Caption:
Fig. 12. — Diagram to show the derivation of the unit or “ommatidium” of the compound eye of Crustacea and Hexapoda, C, from a simple monomeniscous monostichous eye resembling the lateral eye of a scorpion, A, or the unit of the compound lateral eye of Limulus. B represents an intermediate hypothetical form in which the cells beneath the lens are beginning to be superimposed as corneagen, vitrella and retinula, instead of standing side by side in horizontal series. The black represents the cuticular product of the epidermal cells of the ocular area, taking the form either of lens, cl, of crystalline body, cry, or of rhabdom, rhab; hy, hypodermis or epidermal cells; corn1 , laterally-placed cells in the simpler stage, A, which like the nerve-end cells, vit1 and ret1, are corneagens or lens-producing; corn, specialized corneagen or lens-producing cells; vit1, potential vitrella cells with cry1, potential crystalline body now indistinguishable from retinula cells and rhabdomeres; vit, vitrella cell with cry, its contained cuticular product, the crystalline cone or body; ret1, rhab1, retinula cells and rhabdom of scorpion undifferentiated from adjacent cells, vit1; ret, retinula cell; rhab, rhabdom; nf, optic nerve-fibres.
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current | 14:41, 13 July 2011 | 447 × 578 (16 KB) | Bob Burkhardt | {{Information |Description=Diagram to show the derivation of the unit or “ommatidium” of the compound eye of Crustacea and Hexapoda, C, from a simple monomeniscous monostichous eye resembling the lateral eye of a scorpion, A, or the unit of th |
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