- Canadaspis
Taxobox
fossil_range =Cambrian
image_caption = "Canadaspis perfecta" & "Waptia fieldensis"
regnum =Animal ia
phylum =Arthropod a
subphylum =Crustacea
classis = ?Malacostraca
ordo =Canadaspidida
familia =Canadaspididae
genus = "Canadaspis"
genus_authority = Briggs, 1978
subdivision_ranks = Other species
subdivision =
* "C. perfecta" (type)
* "C. laevigata""Canadaspis" ("Shield of Canada") was a
Cambrian genus ofcrustacean oreuarthropod , a benthic feeder that moved mainly by walking and possibly used itsbiramous appendage s to stir mud in search of food. The genus is placed within subclassPhyllocarida in classMalacostraca that includes shrimps and lobsters.Once the food was obtained, "Canadaspis" used its mandibles to grind larger particles. It is possible that its gill flaps were used for locomotion. "Canadapsis perfecta", the type species, comes from the Cambrian-age
Burgess Shale inBritish Columbia ,Canada . "Canadaspis" are also found in different formations of theHouse Range of westernUtah as well as thePioche Shale ofNevada . "Canadaspis laevigata", coming from theChengjiang biota and thus some 10 million years older than "Canadapsis perfecta", is an equivocal member of the genus. Some scientists believe "Canadaspis laevigata" to be a more primitiveCrustaceomorpha antecedent of "Canadaspis", and others consider it a bi-valvedarthropod of uncertain affinity.The
phylogeny of "Canadaspis", like many Cambrianarthropods is in a state of flux.References
*cite web |url=http://www.nmnh.si.edu/paleo/shale/pcanadap.htm |publisher=
National Museum of Natural History |accessdate=11 May |accessyear= 2006 |title="Canadapsis perfecta" (a crustacean)
*cite journal |quotes=no |author=Briggs, D. |year=1978 |title=The morphology, mode of life, and affinities of "Canadaspis perfecta" (Crustacea: Phyllocarida), Middle Cambrian, Burgess Shale, British Columbia |journal=Phil. Trans. R. Soc. Lond. B |volume=281 |issue=984 |pages=439–487 |doi=10.1098/rstb.1978.0005
*cite web |url=http://www.fossilmuseum.net/ |publisher=The Virtual Fossil Museum |title="Canadaspis" from Chengjiang and Utah |accessdate=28 September |accessyear=2006
*cite journal |quotes=no |url=http://jpaleontol.geoscienceworld.org/cgi/content/abstract/77/4/674 |author=Lieberman, A. |year=2003 |title=New Soft-Bodied Fauana: The Pioche Formation of Nevada |journal=Journal of Paleontology |volume=77 |issue=4 |pages=674–690 |doi=10.1666/0022-3360(2003)077<0674:ANSFTP>2.0.CO;2 |doilabel=10.1666/0022-3360(2003)077<0674:ANSFTP>2.0.CO;2
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