FECUNDITY AND SPECIATION IN LAMPREYS
نویسندگان
چکیده
منابع مشابه
European Lampreys: New Insights on Postglacial Colonization, Gene Flow and Speciation
Ice ages are known to be the most dominant palaeoclimatic feature occurring on Earth, producing severe climatic oscillations and consequently shaping the distribution and the population structure of several species. Lampreys constitute excellent models to study the colonization of freshwater systems, as they commonly appear in pairs of closely related species of anadromous versus freshwater res...
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The spinal circuitry underlying the generation of basic locomotor synergies has been described in substantial detail in lampreys and the cellular mechanisms have been identified. The initiation of locomotion, on the other hand, relies on supraspinal networks and the cellular mechanisms involved are only beginning to be understood. This review examines some of the findings relative to the neural...
متن کاملNeuroanatomical evidence for electroreception in lampreys.
The patterns of the anterior lateral-line afferents of Lampetra fluviatilis as revealed by transganglionic transport of horseradish peroxidase are described. The afferents form two roots in entering the rhombencephalon. Fibers of the dorsalmost root can be traced to a short dorsal fascicle which runs along the dorsal nucleus. The ventral roots form two fascicles adjacent to the nucleus intermed...
متن کاملThe Gustatory System of Lampreys
The present is a review of the gustatory system of lampreys, which are representative of the earliest vertebrates. They are the oldest extant vertebrates that possess taste buds. Because of the phylogenetic position of lampreys, the study of their gustatory system will provide important information to help understand the early evolution of this system in vertebrates. The taste buds of larval la...
متن کاملImmunology: The Origin of Sweetbreads in Lampreys?
The thymus is required for the differentiation of T lymphocytes. A new study in lampreys indicates that the pharyngeal epithelium of the gill basket supports the development of T-like cells, suggesting the existence of a primitive thymus in these oldest of vertebrates.
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ژورنال
عنوان ژورنال: Evolution
سال: 1963
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1963.tb03251.x