| 词条 | Scaloid |
| 释义 |
Scaloids are circular scales with visible "cut-up" stripes. True scaloid scales can only be found on the extinct Crossopterygians. The inner layer of the scale is made of lamellar bone. On top of this lies a layer of spongy or vascular bone and then a layer of dentinelike material called cosmine. The upper surface is keratin. The coelacanth has modified scaloid scales that lack cosmine and are thinner than true scaloid scales. Sources
1 : Fish anatomy |
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