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The retroflex trill has been reported from the Dravidian language Toda, and confirmed with laboratory measurements. Peter Ladefoged transcribes it with the IPA symbol normally associated with the retroflex flap, ɽ. Although the tongue starts out in a sub-apical retroflex position, trilling involves the tip of the tongue and causes it to move forward to the alveolar ridge; this means that the retroflex trill gives a preceding vowel retroflex coloration the way other retroflex consonants do, but the vibration itself is not much different from an alveolar trill. Thus the transcription [ɽ͡r] might also be appropriate.

Wintu is another language with a reported (apico-)retroflex trill where the tongue apex "approaches" the hard palate (this is not sub-apical as in Toda). The trill has a retroflex flap allophone occurring in intervocalic position.

Several languages have been reported to have trilled retroflex affricates such as [ɳɖ͡ɽ̝] and [ʈ͡ɽ̝̊], including Mapudungun, Malagasy, and Fijian. However, the exact articulation is seldomly clear from the descriptions. In Fijian, for example, further investigation revealed that the sound (written dr) is seldom trilled, usually realized as a postalveolar stop [n̠d̠] instead. In Mapudungun, the sound (written tr) is strongly retroflex, causing /l/ and /r/ following the subsequent vowel to become retroflex as well. In the southern dialect it varies between /ʈɽ/ and /ʈʂ/, but it is not clear whether the symbol <ɽ> represents a trill or a non-sibilant fricative.

• Pitkin, Harvey. (1984). Wintu grammar. University of California publications in linguistics (Vol. 94). Berkeley: University of California Press. ISBN 0-520-09612-6.

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