ANATOMY OF THE HEART OF THE AMPHIBIA II. CRYPTOBRANCHUS ALLEGANIENSIS
1985; Herpetologists' League; Volume: 41; Issue: 3 Linguagem: Inglês
ISSN
1938-5099
AutoresJ. L. Putnam, James B. Parkerson,
Tópico(s)Fish biology, ecology, and behavior
ResumoThis study of the heart of Cryptobranchus alleganiensis includes the first photo- graphs of the organ. Among the new findings is a rudimentary septum in the sinus venosus and ventricle. Additionally, the interatrial septum, considered to be incomplete (perforated) previously, is found to have an extensive complete (non-perforated) component serving as a sinoatrial valve. In conjunction with this anatomical work, we consider the comparative anatomy of the urodelan heart. Differences in position and shape of chambers suggest two phylogenetic histories for the urodelan heart, one encompassing the Sirenidae-Proteidae and the other encompassing all remain- ing urodeles including Cryptobranchus alleganiensis. THE heart of Cryptobranchus allega- niensis is known from the early works of Branch (1935) and Reese (1906) who ex- amined this organ in conjunction with a broader analysis of all bodily systems. Jol- lie (1962) included in his textbook a ven- tral view of all heart chambers except the sinus venosus but provided little discus- sion of heart structure. Noble (1925) stud- ied the modifications within the atria and conus arteriosus resulting from the devel- opment of cutaneous respiration. Baker (1949) reviewed existing knowledge of the heart in conjunction with an analysis of aortic arches and their relationship to res- piration and degree of metamorphosis. No study, devoted exclusively to the anatomy of the heart, appears in the literature.
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