Results 201 to 210 of about 17,247 (256)
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Calcified arteries in a gastropod
Calcified Tissue Research, 1977The anterior aorta and major arteries of the land pulmonate snail Anguispira alternata have large calcium deposits in their walls. These deposits occur inside spherule cells, which line the walls of these vessels. The calcium occurs as amorphous calcium carbonate, in the form of intracellular spherules having alternating layers of organic and inorganic
A S, Tompa, N, Watabe
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2002
Pleurotomarioidean gastropods are continuously present in the fossil record since the Upper Cambrian and survive into the Recent fauna, thus providing rare insights into the evolutionary history of the class Gastropoda. Pleurotomarioidea achieved greatest numerical and morphological diversity during the Paleozoic, and dominated global shallow water ...
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Pleurotomarioidean gastropods are continuously present in the fossil record since the Upper Cambrian and survive into the Recent fauna, thus providing rare insights into the evolutionary history of the class Gastropoda. Pleurotomarioidea achieved greatest numerical and morphological diversity during the Paleozoic, and dominated global shallow water ...
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2010
Over their 500 million yearhistory, gastropods have radiated into marine, freshwater and terrestrial environments and adopted life styles ranging from herbivory to carnivory to endoparasitism to symbiont-mediated chemoautotrophy. They contend with many pathogens, including several lineages of specialized eukaryotic parasites.
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Over their 500 million yearhistory, gastropods have radiated into marine, freshwater and terrestrial environments and adopted life styles ranging from herbivory to carnivory to endoparasitism to symbiont-mediated chemoautotrophy. They contend with many pathogens, including several lineages of specialized eukaryotic parasites.
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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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1988
Fossil gastropods seem to be ideally suited for studies of heterochrony. The description and analysis of heterochrony in evolutionary sequences require a detailed understanding of the ontogeny of the organisms involved. Not only must the ontogeny be well-preserved in its entirety, but the basic parameters underlying growth must be amenable to ...
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Fossil gastropods seem to be ideally suited for studies of heterochrony. The description and analysis of heterochrony in evolutionary sequences require a detailed understanding of the ontogeny of the organisms involved. Not only must the ontogeny be well-preserved in its entirety, but the basic parameters underlying growth must be amenable to ...
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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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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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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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