Mary Burke, Shobhana Chelliah* and Melissa Robinson Excrescent vowels in Lamkang prefix sequences https://doi.org/10.1515/jsall-2019-2012 Abstract: Lamkang is a Trans-Himalayan language spoken in the Chandel District of Manipur, India by under 10,000 ethnically Naga people. Due to a complex person indexation system in Lamkang clauses, multiple prefixes with the shape C- are attached to a verb stem creating lexemes with the shape CCCCVC. To make such forms pronounceable, speakers insert super-short vowel-like segments between the C- prefixes. Combining acoustic analysis with speakers’ intuitions about syllable structure, we examine the nature of these segments, arguing that an accurate phonetic description of Lamkang vowels must include these super-short vowels, as well as long and short vowels, which are phonemically distinct. We call these super-short vowels excrescent, following the terminology discussed in Hall (2011. Vowel epen- thesis. In Marc van Oostendorp, Colin J. Ewen, Elizabeth V. Hume & Keren Rice (eds.), The blackwell companion to phonology, 1576–1596. Oxford: Blackwell. doi: 10.1002/9781444335262.wbctp0067: 1584). The excrescent vowel is a type of epenthetic vowel, sometimes also called “intrusive”, and is typified by its short duration and centralized quality distinct from lexical vowels. It is unstressed and has the phonetic effect of helping to transition between consonants. We show that the excrescent vowels in Lamkang have formant structures that barely resemble the characteristic formant profiles of the short and long vowels. While excrescent vowels are not contrastive, they are phonologically relevant because they have just enough sonority to form nuclei of C i VC ii syllables where C ii is often ambisyllabic with the following syllable. The Lamkang data show that while any language-specific phonotactic constraints must reference the syllable, what constitutes a syllable must include the possibility of excrescent vowels as nuclei. *Corresponding author: Shobhana Chelliah, University of North Texas, Denton, TX, USA, E-mail: shobhana.chelliah@unt.edu https://orcid.org/0000-0002-2576-1848 Mary Burke: E-mail: mary.burke@unt.edu, Melissa Robinson: E-mail: melissa.robinson@unt.edu, University of North Texas, Denton, TX, USA https://orcid.org/0000-0002-6498-6820 https://orcid.org/0000-0002-1465-2638 JSALL 2019; 6(2): 185–213