Results 221 to 230 of about 43,856 (272)
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2002
Abstract The phylum Mollusca is second only to the Anthropoda in number of species. The molluscan lineage has been extremely plastic, and a great variety of structural plans have appeared. Of the seven classes of molluscs (Fig. 1.1), the largest is Gastropoda, which accounts for about 80% of the extant fauna.
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Abstract The phylum Mollusca is second only to the Anthropoda in number of species. The molluscan lineage has been extremely plastic, and a great variety of structural plans have appeared. Of the seven classes of molluscs (Fig. 1.1), the largest is Gastropoda, which accounts for about 80% of the extant fauna.
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Escape responses of three herbivorous gastropods to the predatory gastropod Conus textile
Animal Behaviour, 1966Summary The herbivorous gastropods Strombus canarium, Lambis lambis, and Trochus pyramis evince escape responses, probably mediated by distance chemoreception, in the presence of the predatory gastropod Conus textile. In Strombus and Lambis, the response has two components: increase in the absolute rate of locomotion, and direction of locomotion ...
A J, Kohn, V, Waters
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Osmotic balance in gastropod molluscs—I some marine and littoral gastropods
Comparative Biochemistry and Physiology, 1965Abstract 1. 1. Blood and urine concentrations of Turritella communis, Littorina saxatilis and other common littoral Gastropods were measured in normal, dilute and concentrated sea-waters and on exposure and reimmersion. The body fluids of active animals were isosmotic with the medium under all tolerated conditions and there was no evidence of ...
A C, Avens, M A, Sleigh
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Notes for a Short Course: Studies in Geology, 1985
Paleoecology concerns the life processes and patterns of environmental relationships of groups of ancient organisms during their lifetimes. Two assumptions are fundamental to paleoecological theory: observed patterns in populations, associations, communities and ecosystems represented in the fossil record were imposed by contemporaneous physical and ...
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Paleoecology concerns the life processes and patterns of environmental relationships of groups of ancient organisms during their lifetimes. Two assumptions are fundamental to paleoecological theory: observed patterns in populations, associations, communities and ecosystems represented in the fossil record were imposed by contemporaneous physical and ...
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2012
O estatólito, análogo aos otólitos, tem-se revelado como um instrumento importante para a determinação da idade e para estudos de crescimento em invertebrados. Localiza-se dentro dos orgãos de equilíbrio, os estatocistos. Apesar de terem sido já bem estudados na classe Cephalopoda, pouco se sabe atualmente sobre a sua estrutura, composição química e ...
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O estatólito, análogo aos otólitos, tem-se revelado como um instrumento importante para a determinação da idade e para estudos de crescimento em invertebrados. Localiza-se dentro dos orgãos de equilíbrio, os estatocistos. Apesar de terem sido já bem estudados na classe Cephalopoda, pouco se sabe atualmente sobre a sua estrutura, composição química e ...
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The Adaptive Significance of Gastropod Torsion
Evolution, 1966Unique among mollusks, the Gastropoda are characterized by a curious asymmetry, resulting from a rotation of the visceral hump and shell. Thus in the earlier stages of their embryonic development, gastropods have the same arrangement of parts as other mollusks, with the rudiments of the mantle cavity, gills, coelomic ducts, and associated structures at
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Biological Reviews, 1983
Summary(I). Gastropods use chemoreception for a wide variety of behaviours including feeding, homing, escape from predators and a variety of social and reproductive behaviours. Chemoreception is used to locate distant food sources, and to discriminate between potential foods.
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Summary(I). Gastropods use chemoreception for a wide variety of behaviours including feeding, homing, escape from predators and a variety of social and reproductive behaviours. Chemoreception is used to locate distant food sources, and to discriminate between potential foods.
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A phylogenetic classification of gastropod aquaporins
Marine Genomics, 2018Successful responses to the multifarious challenges of controlling water balance are critical for snails' survival in the great diversity of habitats they occupy. Advances are being made in understanding how such challenges are approached at the molecular level, including through the study of aquaporins, which are proteins functioning to facilitate the
D J, Colgan, R P, Santos
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What Are the Origins of Ecdysteroids in Gastropods?
General and Comparative Endocrinology, 1995Terrestrial gastropods contain ecdysteroids, the origins of which are unknown. Whether they are synthesized by the animals or they arise from the diet is an open question. To address this problem, labeled cholesterol and various molecules which are efficiently converted into ecdysone by arthropods were tested as possible ecdysone precursors in ...
M, Garcia, B, Griffond, R, Lafont
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Quaternary Structure of Gastropod Haemocyanin
Nature, 1972Three-dimensional image reconstruction shows haemocyanin to be made of three distinct parts. At the ends of the particle are a five-fold “collar” and a central “cap”. The cylindrical wall consists of sixty dimers which may be correlated with 120 oxygen binding sites.
J E, Mellema, A, Klug
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