Titlebook: Evolutionary Biology of Primitive Fishes; R. E. Foreman,A. Gorbman,R. Olsson Book 1985 Springer Science+Business Media New York 1985 biolo

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瑣碎

Facts and Thoughts on Piscine Phylogeny, extends back to the Upper Cambrian. Although craniate animals have many forms and shapes, they are readily subdivided into ten large groups: osteolepipods, urodelomorphs, struniiforms, actinopterygians, brachiopterygians, coelacanthiforms, dipnoans, elasmobranchiomorphs, pteraspidomorphs, and cepha

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Ointment

nascent

The Brain and Sense Organs of the Earliest Vertebrates: Reconstruction of a Morphotype,proach has been to examine the brain and sense organs in living hagfishes and lampreys, with the assumption that these taxa are primitive and thus represent the starting point of vertebrate phylogeny (Worthington, 1906; Ariens Kappers, 1929; Heier, 1948; Stahl, 1977). This approach is confounded by

nascent

oxidize

Organ Development and Specialization in Lamprey Species,genesis begins with the maturation of the gametes, extends through fertilization and differentiation of organ systems, and ends with the death of the individual. Phylogenetic development follows the modification of a species or a group of species through an extended period of time. Due to their lowl

cognizant

Early Development of Oral, Olfactory and Adenohypophyseal Structures of Agnathans and Its Evolutionof present day agnathans. Unfortunately, paleontological evidence for evolution of certain soft structures of the head is not really available, so that embryonic development of such structures is often the basis for speculation in this field . Stensi?, 1968). Here, we would like to address one phase

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