David: Koasati and Mikasuki at opposite ends of the spectrum?.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

A former student of Mvskoke, I have had a soft spot for Koasati for decades.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

From my readings, Koasati is closest to Alibamu, then Appalachee, and then Mikasuki.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

Koasati/Alabama and Hitchiti/Mikasuki are intermediate between them, and share several isoglosses with both.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

There's a very nice sketch of Natchez by Geoff Kimball speaking of Koasati just published earlier this year in the Scancarelli/Hardy volume 'Native Languages of the Southeastern United States'.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

The Koasati seem to have included the ancient Alibamu of central Alabama, while the Hitchiti, on lower Chattahoochee river, appear to have been the remnant of the ancient people of southeast Georgia, and claimed to be of more ancient occupancy than the Muscogee.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

There are also about 300 Alabama, "Cushatta" (Koasati), and Muscogee in Texas.    From Wordnik.com.  [Indians of North Carolina: Letter from the Secretary of the Interior, Transmitting, in Response to a Senate Resolution of June 30, 1914, a Report on the Condition and Tribal Rights of the Indians of Robeson and Adjoining Counties of North Carolina] Reference

Hichitee, Koasati, and Yuchi, each with a distinct language; there are also several smaller broken tribes.    From Wordnik.com.  [The Catholic Encyclopedia, Volume 4: Clandestinity-Diocesan Chancery] Reference

Other native tribes that once lived in Alabama include the Biloxi, Cherokee, Chickasaw, Choctaw, Koasati (Coushatta) and Muskogee.    From Wordnik.com.  [American Chronicle] Reference

"The people speaking the cognate Hitchiti and Koasati were contemptuously designated as "Stincards" by the dominant Muscogee.    From Wordnik.com.  [languagehat.com: MUSKOGEAN AND LAMB'S-QUARTERS.] Reference

Koasati (Alabama & Oklahoma United States) Íniko.    From Wordnik.com.  [Hillary Supporter Dianne Feinstein: The Race Is Over, Make Hillary Veep] Reference

Éy 'skwáchi? áynekw Koasati (Louisiana.    From Wordnik.com.  [Recently Uploaded Slideshows] Reference

Other languages were the Alabama, Koasati, Hichitee, Taskigi, Uchee, Natchee, and Sawanugi or Shawano.    From Wordnik.com.  [Indians of North Carolina: Letter from the Secretary of the Interior, Transmitting, in Response to a Senate Resolution of June 30, 1914, a Report on the Condition and Tribal Rights of the Indians of Robeson and Adjoining Counties of North Carolina] Reference

The Muscogee, Alabama, Koasati, Hichitee, and Taskigi (?) belonged to the Muskhogean stock, the Alabama and Koasati.    From Wordnik.com.  [Indians of North Carolina: Letter from the Secretary of the Interior, Transmitting, in Response to a Senate Resolution of June 30, 1914, a Report on the Condition and Tribal Rights of the Indians of Robeson and Adjoining Counties of North Carolina] Reference