...Among neotenous or perennibranchiateurodeles there is no separate operculum or opercularis...
Theodore H. Eaton 「The Ancestry of Modern Amphibia: A Review of the Evidence」
...Rather, theperennibranchs are distinguished mainly by their neotenous features, andtheir development is likely to show simplifications which are notnecessarily primitive...
Theodore H. Eaton 「The Ancestry of Modern Amphibia: A Review of the Evidence」
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