myomere count

myomere count: in lampreys the myomeres between the 7th gill (first counted is that 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

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preanal myomeres — a count of the number of myomeres or muscle blocks before the anal fin in eel leptocephali. The count includes the myomere over the anus … Dictionary of ichthyology
predorsal myomeres — a count of the number of myomeres or muscle blocks before the dorsal fin in eel leptocephali. The count includes the myomere under the dorsal fin origin … Dictionary of ichthyology
postanal myomeres — muscle bands posterior to the anus in larval fishes, the count being used in identification. The most posterior myomere is bordered by a complete myoseptum in some counts or an incomplete one in other counting methods … Dictionary of ichthyology

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