Yìnglínyú zài yúlèi jìnhuàshǐ shàng chūxiàn de hěn zǎo.
Ganoid-scaled fish appeared very early in fish evolution.
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Ichthyology term: 硬鳞 refers to rhombic, enamel-plated (ganoine) scales found in ancient fish lineages like sturgeon (鲟鱼), paddlefish, and gar. Contrasts with 圆鳞 (cycloid) and 栉鳞 (ctenoid) scales of most modern bony fish. 硬鳞鱼 = ganoid fishes.