There are fourteen families that are Dukes or Earls of Dael Riata. Some of these are older than others, and you can usually tell the off-shoot families by their red stripes on the main colour shields from their older lines.

Ranald, Grand Dukes of Reoch & Kings of Dael Riata	Gilranald, Earls of Norpen	Ahearn, Earls of Suddal	Giluilleam, Earls of Dalry
fretty vert or a stag's head proper in chief point a tower triple towered celestial azure in fess point	vert bend sanguine a seagull argent volant in fess point	Maily tenne and argent a horse rampant sable hooved sanguine	annuletty azure and argent a chevron sanguine a boar's head proper dexter
Gilcinead, Earls of Craigmuir	Aonghus, Earls of Beatham	Riata, Dukes of Glasholm	Gilriata, Earls of Dalcot
per saltire or and gules below one martlett orange volante shown smaller a tree proper	Per-pale double arched estoilly purpure and argent and estoilly argent and purpure a saltire parted and fretty murrey three torques or.	Per-saltire celestial azure purpure. a claymore inverted proper in fess a ducal crown proper in base point	Per-saltire sanguine celestial azure a claymore inverted proper in fess
Sithech, Earls of Aifric	Suibhne, Earls of Douglas	Sioltach, Earls of Duff	Gilruary, Earls of Dalmuir
Paly carnation and vert per saltire counterchanged a wolf tenne langued gules.	Papelony sable argent, in chief throughout five apples Or. Fesse azure a galley sanguine	Per bend sinister indented Vert and Lozengy Or and Gules,  a unicorn statant argent.	Azure seme de ships proper sails bisque fimbriated argent an anchor sanguine
Murchadh, Earls of Uisdean	Gilranald, Earls of Norpen
Maily or and sable a ship sable sails bisque	Barry pily argent and vert. below a cloud argent A mountain proper

All the shields above have been drawn using https://drawshield.net/random/ which as well as having useful reference material on creating blazons using proper heraldic terms, also draws them.