In the comparative physiology of photoreception by the Protista and the invertebrates two aspects are emphasized: (1) the diversity of visual processes in these groups and (2) their bearing upon general mechanisms of photoreception. Invertebrates have evolved a far greater variety of adaptations than vertebrates modifications aiding survival in the remarkably different biotopes they occupy. The number of species in itself suggests this multiformity; each of them has peculiarities of its own, in morphology as well as in physiology and behavior. But these special adaptations are variations on a few great themes. Although the catalogue of invertebrate species is immense, the literature concerning them nearly rivals it in extent-even if one considers only that fraction dealing with visual physiology. Taxonomy proceeds by grouping the species, categorizing them in genera, families, orders, and progressively larger units. Similarly, comparative physiology aims at an analogous, more or less compre hensive, classification. This Part A of Volume VII/6, like Part B that follows it, emphasizes the broad questions that concern groups larger than the individual species; in some cases these questions have general applicability. The middle course between approaches that are too specialized and those that are too general is often elusive, but here we attempt to follow it. The vast number of special adaptations-probably, as we have said, as large as the number of species-is beyond the range even of a handbook.
Comparative Physiology and Evolution of Vision in Invertebrates
Comparative Physiology and Evolution of Vision in Invertebrates: Handbook of sensory physiology / ed. board: H. Autrum .... Invertebrate visual...
Morphology and physiology are two fields which cannot be separated.
Throughout the book, we have tried to emphasise one of the major themes to emerge within the ecology of vision: the high degree of adaptability that visual mechanisms are capable of undergoing in response to diverse, and dynamic, ...
Some of the interpretations of the Burgess shale fossils indicated the appearance of many enigmatic types of animals that did not seem to belong to any of the phyla remaining today. Subsequent and more careful analyses have demonstrated ...
The text also describes the crustacean and mollusc eyes; the vertebrate retinal photoreceptors; and the invertebrate eye and its visual pigments.
This volume includes some examples of progress made by the use of such specially selected vertebrate systems.
... Robert Munn PhD, Chris Murphy DVM, Mike Murray DVM, Dan Eric Nilsson PhD, Ichiro Nishii PhD, Dieter Oesterhelt PhD, Rebecca Papendick DVM, David Pearson PhD, Simon Petersen-Jones DVM PhD, Jack Pettigrew BSc (Med), MSc, MB, BS, FRS.
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I see a man's life is a tedious one. Cymbeline, Act III, Sc. 6. It is well known that the best way to learn a subject is to teach it!...