Cheiracanthus (from Greek: χείρ kheír, 'hand' and Greek: ἄκανθα akantha, 'spine')[1] is an extinct genus of a group of fish called Acanthodii (or "spiny sharks").
It had a blunt head, upturned tail, and fins protected by spines.
Cheiracanthus swam at mid-depth in lakes and rivers, seizing small prey in its gaping jaws.
Whole fossils of this fish occur only in Mid-Devonian rocks in Scotland, but its distinctive small, ornamented scales crop up around the world, as far south as Antarctica.
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