Co-articulated consonant
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Co-articulated consonants are consonants produced with two simultaneous places of articulation. They may be divided into two classes, doubly articulated consonants with two primary places of articulation of the same manner (both plosive, or both nasal, etc.), and consonants with secondary articulation, that is, a second articulation not of the same manner.
An example of a doubly articulated consonant is the voiceless labial-velar plosive [k͡p], which is pronounced simulateously at the velum (a [k]) and at the lips (a [p]). On the other hand, the voiceless labialized velar plosive [kʷ] has only a single stop articulation, velar [k], with a simultaneous approximant-like rounding of the lips.
Except for clicks, practically all doubly articulated consonants are labial-velars. However, there is a large number of common secondary articulations. The most frequently encountered are labialization (such as [kʷ]), palatalization (such as the Russian "soft" consonant [tʲ]), velarization (such as the English "dark" el [lˠ]), and pharyngealization (such as the Arabic "emphatic" consonant [tˤ]).
As might be expected from the approximant-like nature of secondary articulation, it is not always easy to tell whether a co-articulated approximant consonant such as /w/ is doubly or secondarily articulated. In English, for example, /w/ is a labialized velar that could be transcribed as [ɰʷ], but the Japanese /w/ is closer to a true labial-velar, [ɰ͡β̞]. It is common usage to restrict phonetic [w] to the former.
The glottis controls phonation, and works simultaneously with many consonants. It is not normally considered an articulator, and an ejective [kʼ], with simultaneous closure of the velum and glottis, is not normally considered to be a co-articulated consonant.
