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The amphibian octavo-lateralis system and its regressive and progressive evolution
1University of Bielefeld, Faculty of Biology, FRG.
Acta Biologica Hungarica
|January 1, 1988
Summary
The evolution of the octavolateralis system in amphibians reveals distinct patterns. While some retain lateral line systems, others develop advanced auditory structures, suggesting parallel evolution in tetrapods.
Area of Science:
- Evolutionary Biology
- Comparative Anatomy
- Neuroscience
Background:
- The octavolateralis system, crucial for sensory perception, has undergone significant changes during vertebrate evolution.
- Understanding these changes in amphibians provides insights into the transition from aquatic to terrestrial life and the development of sensory systems in tetrapods.
Purpose of the Study:
- To review the phylogenetic and ontogenetic changes in the octavolateralis system of sarcopterygian fish and tetrapods.
- To investigate the evolution of the amphibian auditory system and its relationship with the lateral line system.
- To compare the development of the auditory periphery in amphibians and amniotes.
Main Methods:
- Comparative analysis of phylogenetic and ontogenetic data.
- Review of existing literature on the octavolateralis system in various amphibian lineages (urodeles, anurans).
- Examination of the basilar papilla, lateral line system, and efferent innervation patterns.
Main Results:
- Amphibian lateral line systems show diverse patterns of reduction and loss, with metamorphic retention in urodeles and loss in anurans.
- The basilar papilla, a key auditory structure, is present in most tetrapods but shows trends towards reduction in some amphibians.
- Anurans exhibit a unique evolutionary path with the development of a tympanic ear and progressive auditory epithelia, suggesting parallel evolution with amniotes.
- Auditory nuclei development in anurans is independent of lateral line system metamorphosis and electroreceptor presence.
Conclusions:
- The evolution of the amphibian auditory system is characterized by diverse pathways, including parallel evolution with amniotes in anurans.
- The development of auditory and lateral line nuclei in anurans is distinct, with specialized neural pathways.
- Changes in the octavolateralis system reflect adaptations to different environments and lifestyles within amphibians.