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  1. Abstract A'ingae (or Cofán,ISO639‐3: con) is an indigenous language isolate spoken in northeast Ecuador and southern Colombia. This paper presents the first comprehensive overview of the A'ingae phonology, including descriptions of (i) the language's phonemic inventory, (ii) phonotactics and a number of related phonological rules, (iii) nasality and nasal spreading, as well as (iv) stress, glottalisation, their morphophonology, and aspects of clause‐level prosody. 
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  2. I describe and analyze a process of postlabial rounding in A’ingae (isolate, ISO 639-3: con): after labial consonants, the diphthong /ae/ may surface as [oe]. However, a postlabial monophthongal /a/ always surfaces faithfully as [a]. To capture these facts, I propose an analysis couched in Q-Theory, where one vocalic target of a diphthong corresponds to fewer subsegments than a monophthong. This predicts that diphthongs might show an emergence-of-the-unmarked (TETU) effect, while monophthongs surface faithfully. The prediction is borne out by A’ingae postlabial rounding, contributing a novel argument for the Q-Theoretic representations. Finally, I show that similar asymmetries between diphthongs and monophthongs have recurred throughout the language’s history, further strengthening the proposal. 
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    Free, publicly-accessible full text available May 14, 2026