ctenacanthoid
Not helmeted.
Relating to the ctenacanthids
(mathematics) A logarithmic line on a Gunter's scale, which is used to perform the multiplication and division of numbers mechanically with only dividers.
plural of bull daisy
デボン紀の地層で発見されたクテナカンチド類に関連する鰭の棘は、初期サメ類の進化に新たな知見をもたらした。
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