Vertebrate Relationships

Vertebrate Relationships - Vertebrate Relationships chapter...

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Unformatted text preview: Vertebrate Relationships chapter 4 Diplomystus alta , a fossil fish from the Eocene Green River Formation ACM teaching collection Vertebrates are a subphylum within the phylum chordata Kingdom- animalia Phylum- Chordata Subphylum- Vertebrata What is a chordate? Chordates are a group of animals that have the following characters at least at some point in their lives:- Notochord- Dorsal hollow nerve cord- Pharyngeal gill slits- Post-anal tail- Iodine secreting gland (hyoid or endostyle) Chordate Characters There are 3 subgroups of chordates Urochordata Cephalochordata Vertebrata Amphioxus , a cephalochordate A sea squirt, a urochordate http://cache.eb.com/eb/image?id=4054&rendTypeId=4 http://www.photobirds.com/templates/default/images_pubs/bird_skeleton.jpg Pigeon, a vertebrate Urochordates Adults are sessile filter feeders; they lack the nerve cord, notochord, and post-anal tail Why are they classified as chordates? Juveniles possess all chordate characters A larval sea squirt www.bumblebee.org/ Urochordates continued The juvenile stage is used for dispersal purposes; the larvae swim around to find a suitable habitat that is not crowded with other sea squirts This suggests to some that chordate characters are larval characters, and that other chordates retain them by paedomorphosis (retention of larval traits in adults) Fossil record is spotty because these animals have no hard parts Earliest known representative is Shankouclava , from the Maotianshan Shale (Early Cambrian, China) Urochordates continued Shankouclava Chen et al. 2003 Cephalochordates Retain their chordate characters throughout life Live partly buried in sand and gravel in oceans Filter feed Actively swim when...
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This note was uploaded on 04/22/2008 for the course GEOL 111 taught by Professor Getty during the Fall '07 term at UConn.

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Vertebrate Relationships - Vertebrate Relationships chapter...

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