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myomere count
(English) In lampreys the myomeres between the 7th gill (first counted is what whose posterior septum passes entirely behind the groove) and the one whose lower posterior angle lies wholly or partly above the cloacal slit. Sometimes myomeres are counted between the eye and the cloaca, although this count seems to have little to recommend it. (See also: myomere, septum, cloaca)

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