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单词 ctenacanthus
释义 cten·acan·thus
\ˌtenəˈkan(t)thəs, ˌtēn-\ noun
Usage: capitalized
Etymology: New Latin, from cten- + -acanthus
: a genus of Upper Devonian and Lower Permian sharks related to Cladoselache and known chiefly from its very stout fin spines
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