Über die Ultrastruktur des Komplexauges von Daphnia pulex (original) (raw)
Summary
Compound eyes of adult Daphnia pulex and their connection with the integument have been examined electron microscopically. The eye contains four elements: 1. covering cells, 2. intercellular substance, 3. lense cells and 4. receptor cells containing pigment. Their ultrastructure is described. Since the light refracting medium forms a compact lense body within the cytoplasm of lense cells it belongs to the “eucone” type. Though being surrounded by threaded mitochondria the lense body is not separated from the cytoplasm by a membrane. Electron density increases towards its center. At its basal part the central zone being covered only by a plasma membrane borders on the rhabdomer, the microvilli of which show close contacts between each other. There are desmosome-like contacts between lense and receptor cells at the periphery of the rhabdomer. 8 receptor cells each giving off 1 neurite build up the ommatidium. The 8 neurites of one ommatidium are bundled by a basement membrane and a glial process originating from the optic ganglion. The eye in toto is tied to the integument (cuticular cells, cuticula) by a complicated supporting apparatus, which consists of specialized cells and basement membrane-like material.
Zusammenfassung
Die Komplexaugen von erwachsenen Daphnien (Daphnia pulex) und deren Verankerung wurden elektronenmikroskopisch untersucht. Das Auge enthält 4 Bau-Elemente: 1. Deckzellen, 2. Interzellularsubstanz, 3. Linsenzellen und 4. pigmenthaltige Receptorzellen. Ihre Ultrastruktur wird beschrieben.
Da die lichtbrechende Substanz als kompakter Körper innerhalb der Linsenzellen liegt, gehört der Linsenkörper zum „euconen Typ. Er wird von aufgereihten Mitochondrion umgeben, ist nicht durch eine Membran vom Cytoplasma getrennt und zeigt eine nach innen zunehmende Elektronendichte.
Die zentral gelegene, sehr dichte Zone grenzt basal an das Rhabdomer, nur durch die Zellmembran von ihm getrennt. Das Rhabdomer besteht aus Mikrovilli, die durch „close contacts miteinander verbunden sind. Desmosomen-ähnliche Haftstrukturen zwischen Linsen- und Receptorzellen kommen in der Nähe der Rhabdomere vor. Aus den jeweils 8 Receptorzellen eines Ommatidiums entspringen basal 8 Neuriten, die zunächst durch eine Basalmembran, im Bereich des Hilus außerdem durch einen Gliafortsatz aus dem Ganglion opticum gebündelt werden. Das ganze Auge ist an der Körperoberfläche (Cuticularzellen und Cuticula) durch einen Halteapparat aufgehängt, der aus spezialisierten Zellen und Basalmembran-artigem Material besteht.
Access this article
Subscribe and save
- Get 10 units per month
- Download Article/Chapter or eBook
- 1 Unit = 1 Article or 1 Chapter
- Cancel anytime Subscribe now
Buy Now
Price excludes VAT (USA)
Tax calculation will be finalised during checkout.
Instant access to the full article PDF.
Similar content being viewed by others
Literatur
- Bullock, T. H., Horridge, G. A.: Structure and function in the nervous system of invertebrates, II. San. Francisco-London: Freeman & Co. 1965.
Google Scholar - Dribakin, F. G.: Types of photoreceptor cells in the compound eye of the worker honey-bee Apis mellifera as revealed by electron microscopy. [Russian.] Tsitologiya 9/10, 1276–1280 (1967).
Google Scholar - Eakin, R. M., Brandenburger, J. L.: Differentiation in the eye of a pulmonate snail Helix aspersa. Ultrastruct. Res. 18, 391–421 (1967).
Google Scholar - —: Function significance of small vesicles in photoreceptoral cells of a snail, Helix aspersa. J. Cell Biol. 35, 36 (1967) (Abstract).
Google Scholar - Eguchi, E., Waterman, T. H.: Changes in retinal fine structure induced in the crab Libinia by light and dark adaptation. J. exp. Biol. 34, 469–477 (1957).
Google Scholar - Fahrenbach, W. H.: The fine structure of a nauplius eye. Z. Zellforsch. 62, 182–197 (1964).
Google Scholar - Kaestner, A.: Lehrbuch der speziellen Zoologie, Bd. I, Teil 2. Jena: VEB Gustav Fischer 1967.
Google Scholar - Krugelis Macrae, E.: The fine structure of photoreceptors in a marine flatworm. Z. Zellforsch. 75 (2), 469–484 (1966).
Google Scholar - Lai Fook, J.: The structure of developing muscle insertions in insects. J. Morph. 123, 503–527 (1967).
Google Scholar - Lasansky, A.: Cell junctions in ommatidia of Limulus. J. Cell Biol. 33, 365–383 (1967).
Google Scholar - Peters, A.: Plasma membrane contacts in the central nervous system. J. Anat. (Lond.) 96, 237–248 (1962).
Google Scholar - Röhlich, P., Törö, J.: Ultrastructural changes in the Daphnia eye induced by light and darkness. 8. Intern. Anat. Kongr. Wiesbaden 1965.
- Rutherford, D. J., Horridge, G. A.: The rhabdom of the lobster eye. Quart. J. micr. Sci. 106, 119–130 (1965).
Google Scholar - Wolff, J. R., Güldner, F.-H.: Die Ultrastruktur der Opticusfasern und des Ganglion opticum des Wasserflohs Daphnia pulex. Z. Zellforsch. 103, 526–543 (1970).
Google Scholar - Wolken, J. J., Gallik, G. J.: The compound eye of a crustacean „_Leptodora Kindtii_“. J. Cell Biol. 26, 968–973 (1965).
Google Scholar
Author information
Authors and Affiliations
- II. Anatomisches Institut der Freien Universität Berlin, Deutschland
F. -H. Güldner & J. R. Wolff
Authors
- F. -H. Güldner
You can also search for this author inPubMed Google Scholar - J. R. Wolff
You can also search for this author inPubMed Google Scholar
Rights and permissions
About this article
Cite this article
Güldner, F.H., Wolff, J.R. Über die Ultrastruktur des Komplexauges von Daphnia pulex.Z. Zellforsch. 104, 259–274 (1970). https://doi.org/10.1007/BF00309735
- Received: 14 November 1969
- Issue Date: June 1970
- DOI: https://doi.org/10.1007/BF00309735