Die Feinstruktur des Auges der Weinbergschnecke (Helix pomatia L.)

Röhlich, P.; Török, Ludwig

doi:10.1007/bf00336611

Cited by 47 publications

(6 citation statements)

References 19 publications

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“…Helix pomatia (Rohlich & Torok 1963) and H. aspersa (Brandenburger 1975), however, those of the two aquatic pulmonates possess simpler corneal ultrastructures and fewer retinal cell types. On the other hand, a non-homogeneous lens like that encountered in Latia and Ancylus, has only been shown to be present in the differentiating lens of immature specimens of Helix (Eakin & Brandenburger 1967).…”

Section: Discussionmentioning

confidence: 99%

Anatomical and ultrastructural comparison of the eyes of two species of aquatic, pulmonate gastropods: The bioluminescentLatia neritoidesand the non‐luminescentAncylus fluviatilis

Meyer‐Rochow

Bobkova

2001

New Zealand Journal of Marine and Freshwater Research

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New Zealand Journal of Marine and Freshwater Research, 2001, Vol. 35: 739-750 Abstract Light-adapted eyes of two freshwater gastropods with similar habitat preferences (Latia neritoides (Gray 1850) and Ancylus fluviatilis (Müller 1774)) were compared with each other in relation to optics, anatomy, and ultrastructure. Individuals of L. neritoides not only possess significantly larger eyes than similarly sized A. fluviatilis, they also have a more voluminous layer of photoreceptive membranes and appear capable of discerning at least some crude shapes. The eye of A. fluviatilis, on the other hand, has a very shallow retina which is so closely apposed to the lens that it can be little more than an indicator of light and darkness. Both types of eye are generously endowed with screening pigment granules and exhibit no signs of light-induced damage. Although the lenticular F-values for L. neritoides (1.78) and A. fluviatilis (1.74) alone are hardly indicative of an adaptation to a dark environment, the greater amount of photic vesicles and the substantial development of muscle fibres in the eye of L. neritoides suggest that the latter can adjust its vision more rapidly to changing light levels than that of A. fluviatilis. Since L. neritoides (but not A. fluviatilis) has the ability to secrete a bright green luminescent mucus, a faster accommodation system would serve the species well. There is, however, no proof that in Latia bioluminescence alone has been responsible for the development of a more capable eye. Most of the differences between the eyes of L. neritoides and A. fluviatilis can be explained by the distinctly greater nocturnal activity of L. neritoides in combination with the ability to produce bright light in the latter species.

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Section: Discussionmentioning

confidence: 99%

Anatomical and ultrastructural comparison of the eyes of two species of aquatic, pulmonate gastropods: The bioluminescentLatia neritoidesand the non‐luminescentAncylus fluviatilis

Meyer‐Rochow

Bobkova

2001

New Zealand Journal of Marine and Freshwater Research

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“…In the Mollusca, the lenses in the eyes of Loligo pealii (Lesueur, 1821) and Octopus vulgaris (Cuvier, 1797) are cellular (Arnold 1967), but those in the eyes of Gastropoda are acellular. In several Gastropoda species, a spherical lens located in the center of the eye is formed by the extracellular aggregation of secretory products, and exhibits concentric rings having different staining intensities to the periphery or a narrow outer zone staining more intensely (Röhlich and Török 1963;Newell 1965;Eakin and Brandenburger 1967;Newell and Newell 1968;Stoll 1973). However, the fine structure of the lens of Gastropoda eyes has been reported to be homogeneous (Eakin and Westfall 1964;Hughes 1970;Mayes and Hermans 1973;Eakin et al 1980).…”

Section: A Introductionmentioning

confidence: 99%

Fine structure of the dioptric apparatus in the stalk eye of Onchidium verruculatum (Gastropoda, Stylommatophora): a distinct lamellar substructure of the lens

Hamasaki-Katagiri¹,

Katagiri

1998

Zoomorphology

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The dioptric apparatus of the stalk eye in Onchidium verruculatum, including a tentacular epidermis, a cornea, and a lens, was examined using transmission electron microscopy. The tentacular epidermis was formed by columnar epidermal cells, sensory dendrites, and glandular cells. The cornea was an anterior part of the eye vesicle and consisted of corneal cells which contained abundant glycogen particles but no dark pigment granules in their cytoplasm. An acellular, transparent, ellipsoidal lens was located in the center of the eye vesicle. The lens showed a marginal zone, an outer zone, a transitional zone, an inner zone, and a central region arranged concentrically. The outer zone was the most intense electron-dense region and was finely granular in structure. The marginal zone was also finely granular and surrounded the outer zone with many hair-like slender strands on the retinal side. Toward the center of the lens this homogeneous fine granularity gradually changed into globular or rod-like substructures, about 30 nm in diameter, and then abruptly transformed into a lamellar substructure of about 30 nm in thickness. The inner zone contained a mosaic of lamellar substructures which were arranged in a fingerprint pattern that was particularly enhanced with periodic acid methenamine silver proteinate staining. The center itself consisted of deformed lamellar substructures. The concentric arrangement of substructures inside the lens of the O. verruculatum stalk eye is probably responsible for the concentration and/or refraction of light.& b d y :

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“…or concentrated basally near the nuclei in the nocturnal Limax sp., supporting the suggestion that the vesicles are associated with photoreception ( Eakin and Brandenburger, 1975 ). Previous studies suggest several functions for these vesicles, including storage of photopigment ( Röhlich and Török, 1963 ; Eakin and Brandenburger, 1968 ; Eakin, 1990 ). Within C. luhuanus ( Ozaki et al, 1986 ) and Onchidium sp.…”

Section: Discussionmentioning

confidence: 95%

The marine gastropod Conomurex luhuanus (Strombidae) has high-resolution spatial vision and eyes with complex retinas

Irwin

Williams

Speiser

et al. 2022

Journal of Experimental Biology

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All species within the conch snail family Strombidae possess large camera-type eyes that are surprisingly well-developed compared to those found in most other gastropods. Although these eyes are known to be structurally complex, very little research on their visual function has been conducted. Here, we use isoluminant expanding visual stimuli to measure the spatial resolution and contrast sensitivity of a strombid, Conomurex luhuanus. Using these stimuli, we show that this species responds to objects as small as 1.06° in its visual field. We also show that C. luhuanus responds to Michelson contrasts of 0.07, a low contrast sensitivity between object and background. The defensive withdrawal response elicited by visual stimuli of such small angular size and low contrast suggests that conch snails may use spatial vision for the early detection of potential predators. We support these findings with morphological estimations of spatial resolution of 1.04°. These anatomical data therefore agree with the behavioural measures and highlight the benefits of integrating behavioural and morphological approaches in animal vision studies. Using contemporary imaging techniques (serial block-face scanning electron microscopy (SBF-SEM), in conjunction with transmission electron microscopy (TEM)), we find that C. luhuanus have more complex retinas, in terms of cell type diversity, than expected based on previous studies of the group using TEM alone. We find the C. luhuanus retina is comprised of six cell types, including a newly identified ganglion cell and accessory photoreceptor, rather than the previously described four cell types.

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Die Feinstruktur des Auges der Weinbergschnecke (Helix pomatia L.)

Cited by 47 publications

References 19 publications

Anatomical and ultrastructural comparison of the eyes of two species of aquatic, pulmonate gastropods: The bioluminescentLatia neritoidesand the non‐luminescentAncylus fluviatilis

Anatomical and ultrastructural comparison of the eyes of two species of aquatic, pulmonate gastropods: The bioluminescentLatia neritoidesand the non‐luminescentAncylus fluviatilis

Fine structure of the dioptric apparatus in the stalk eye of Onchidium verruculatum (Gastropoda, Stylommatophora): a distinct lamellar substructure of the lens

The marine gastropod Conomurex luhuanus (Strombidae) has high-resolution spatial vision and eyes with complex retinas

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