Lancelet presentation

Lancelet presentation - •General Habitat: Shallow...

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I am not spineless… I am a Chordate.
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Lancelets Animal Classification: Cephalochordata Phylum: Chordata Class: Cephalochordata Lancelets are also called acraniates. They possess key Chordate features. Generally believed to be the closest living relative to vertebrates.
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Facts feeds on the particles in the water and plankton are globally rare, but in some areas (such as Tampa Bay) they can be found in excess of 5,000 individuals per square meter. alternates between upward swimming and passive sinking Sexes in cephalochordates are separate
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Facts II •Field Marks: Blade-like shape, moved via side-to-side undulation, silver color, yet appears transparent. •Size: Up to 2 inches (5 cm).
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Unformatted text preview: •General Habitat: Shallow tropical or temperate waters. Found at low tide, buried in sand in a tiny pool, a quarter-mile from shore. Chordate Features • notochord • dorsal hollow nerve cord • pharyngeal slits • post anal tail with fins Anatomy Shared Features with Vertebrates • organization of the main body musculature into separate segments • organization of the circulatory system • a caecum that is probably homologous to the vertebrate liver Fossils Pikaia gracilens from the Canadian Burgess Shale (Cambrian, ca. 530 million years old) Species • Smalltail lancelet • Florida lancelet • European lancelet • Epigonichthys cultellus • Bahama lancelet...
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This document was uploaded on 10/30/2011 for the course BSC 1011H at Valencia.

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Lancelet presentation - •General Habitat: Shallow...

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