X hits on this document

53 views

0 shares

0 downloads

0 comments

14 / 28

Placoderms (“Tablet Skins”)

Early jawed fishes that bore jointed bony plates over the head and thorax.

Rear parts were naked or covered by small scales.

Jaw-mounted bony plates served as teeth.

Dominated brackish and near-shore ecosystems.

Some stretched 30 feet, but most were inches long.

Spread to both marine and freshwater habitats.

Became the first vertebrates to colonize the open ocean.

Went extinct at the end of the Devonian.

Silurian

Image courtesy of Nobu Tamora.

Page 14

Coccosteus decipiens, a placoderm of Europe and North America.

Document info
Document views53
Page views53
Page last viewedSat Dec 03 01:14:09 UTC 2016
Pages28
Paragraphs405
Words2015

Comments