Ultrastructure of the larval eyes of Hermissenda crassicornis (Mollusca: Nudibranchia)

Buchanan, J. William

doi:10.1016/0889-1605(86)90051-0

Cited by 8 publications

(7 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultrastructural studies of the eyes of veliger larvae of Gastropoda (exclusively of Heteropoda) indicate that the photoreceptors are either of the rhabomeric or of the ciliary type (see Hughes 1970;Chia and Koss 1978;Crowther and Bonar 1980;Buchanan 1986;Blumer 1994Blumer , 1995Blumer , 1996. Only in Lacuna divaricata Fabricius, 1780 are both types of photoreceptors described (see Bartolomaeus 1992).…”

Section: A Introductionmentioning

confidence: 95%

Alterations of the eyes of Carinaria lamarcki (Gastropoda, Heteropoda) during the long pelagic cycle

Blumer

1998

Zoomorphology

View full text Add to dashboard Cite

The eyes of different larval stages of Carinaria lamarcki were examined ultrastructurally. In all larval stages the eyes consist of a cornea, a lens and an everse retina. The photoreceptors in young larvae are exclusively of the ciliary type. In old larvae, however, two types of photoreceptors are present and the retina is composed of two segments: a posterior segment with altered ciliary photoreceptors (=type I sensory cells) and an anterior segment with what are presumably rhabdomeric photoreceptors (=type II sensory cells). The anterior retina is interpreted here as an accelerted character. Furthermore, the arrangement of the pigment granules changes during the long larval development being cup shaped in young larvae versus ribbon shaped in old larvae. The findings allow for the conclusions that: (a) the ciliary photoreceptors are correlated with the long larval period of Heteropoda and that (b) the eyes are altered continuously during the larval cycle.& b d y :

show abstract

Section: A Introductionmentioning

confidence: 95%

Alterations of the eyes of Carinaria lamarcki (Gastropoda, Heteropoda) during the long pelagic cycle

Blumer

1998

Zoomorphology

View full text Add to dashboard Cite

show abstract

“…In the transitional zone, the lens material may undergo chemical or physical changes, with the internal ultrastructure of the lens changing from granular to lamellar via a somewhat indistinct region. Alternatively, this concentric staining in the lenses of Gastropoda eyes, including the stalk eye of O. verruculatum, may represent a pattern of accumulation of lens materials during growth (Buchanan 1986).…”

Section: Substructure and Staining Of The Lensmentioning

confidence: 99%

“…The chemical nature of the acellular lenses of Gastropoda eyes has been unclear, although the lens of the eye of Hermissenda crassicornis (Eschscholtz, 1831) is known to be osmiophilic Buchanan 1986) and that of Ilyanassa obsoleta (Say, 1822) is probably proteinaceous (Gibson 1984b). The results of the PAMS staining suggest the lens of the stalk eye of O. ver-ruculatum may contain mucopolysaccharide.…”

Section: Substructure and Staining Of The Lensmentioning

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

View full text Add to dashboard Cite

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 :

show abstract

“…Additionally, H . crassicornis has been used to investigate ultrastructure and anatomy [ 14 – 15 ], larval and reproductive ecology [ 16 – 17 ], behavioral ecology [ 18 – 20 ] and pharmacology and toxicology [ 21 – 22 ], resulting in a wealth of papers and information widely cited in modern literature. Because H .…”

Section: Introductionmentioning

confidence: 99%

The Model Organism Hermissenda crassicornis (Gastropoda: Heterobranchia) Is a Species Complex

Lindsay

Valdés

2016

PLoS ONE

View full text Add to dashboard Cite

Hermissenda crassicornis is a model organism used in various fields of research including neurology, ecology, pharmacology, and toxicology. In order to investigate the systematics of this species and the presence of cryptic species in H. crassicornis, we conducted a comprehensive molecular and morphological analysis of this species covering its entire range across the North Pacific Ocean. We determined that H. crassicornis constitutes a species complex of three distinct species. The name Hermissensa crassicornis is retained for the northeast Pacific species, occurring from Alaska to Northern California. The name H. opalescens is reinstated for a species occurring from the Sea of Cortez to Northern California. Finally, the name H. emurai is maintained for the northwestern species, found in Japan and in the Russian Far East. These three species have consistent morphological and color pattern differences that can be used for identification in the field.

show abstract

Ultrastructure of the larval eyes of Hermissenda crassicornis (Mollusca: Nudibranchia)

Cited by 8 publications

References 26 publications

Alterations of the eyes of Carinaria lamarcki (Gastropoda, Heteropoda) during the long pelagic cycle

Alterations of the eyes of Carinaria lamarcki (Gastropoda, Heteropoda) during the long pelagic cycle

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

The Model Organism Hermissenda crassicornis (Gastropoda: Heterobranchia) Is a Species Complex

Contact Info

Product

Resources

About