Tiktaalik Flashcards
Tiktaalik roseae is a link between … and … …
fishes, terrestrial vertebrates
Discovered in … …
arctic canada
…, superficially …-like animal with a skull … long
flattened, crocodile, 20cm
Discovered in …
2004
Helps fill gap between … and … and ….
Icthyostega, Acanthostega (primitive Devonian tetrapods), Panderichthyes (Devonian tetrapod-like predatory fish)
Ichthyostega and Acanthostega retain true … tails with fin … but are unambiguous … nevertheless, with limbs that bear …
fish, rays, tetrapods, digits
Pectoral fin and shoulder … of panderichthyes suggests it was beginning to …, but perhaps in shallow water rather than on land
girdle, walk
Tiktaalik is (at least one of) the earliest…
tetrapods on the phylogenetic tree
Well-developed … … suggest tiktaalik (and panderichthyes) remained … …
gill arches, mostly aquatic
Tiktaalik’s bony … … has disappeared though, and its skull has a … …
gill cover, longer snout
- changes relate to breathing (reduced water flow) and feeding - shift from sucking towards snapping up prey
Tiktaalik’s … are larger, suggesting it was better able to … its body … … …
ribs, support, out of water
The gills and … … of Tiktaalik are …
pectoral fins, transitional
Still gap that in fossil record between … and the…
tiktaalik, earliest tetrapods (ichthyostega and acanthostega)
- there are still large unexplored areas of unexplored late devonian and early carboniferous deposits
