hemichordates enteropneusta 1 indirect development

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Unformatted text preview: HORDATES: Enteropneusta 1) Indirect development through tornaria larva stage HEMICHORDATES: Pterobranchia 1) 2) 3) 4) Small worm-like animals Live in sectreted tubes Plancton feeders About 30 known species H E M I C H O R D A T E S : Pterobranchia 1) Living in secreted tubes Colony and single individual of pterobranch Rhabdopleura compacta http://users.ox.ac.uk/~zool0456/Sato.htm HEMICHORDATES: Pterobranchia 1) Filtering of plancton by cilia covered tentacles Basal deuterostome phylogeny: the complex truth Bourlat et al 2006 Sea squirt [Ciona intestinalis] http://www.ncbi.nlm.nih.gov/genomes/leuks.cgi UROCHORDATES (Tunicata): basic facts 1) 2) 2) 3) ~3000 species Small worm-like animals Tadpole like larval stage Filter feeding through gil basket 4) Develop through tadpole larval stage. http://home.uchicago.edu/~egrey/ascidian_biology.htm TUNICATE diversity TUNICATE 1) 2) 3) 4) Ascidiacea Thaliacea Appendicularia Sorberacea TUNICATE diversity: Ascidiacea (sea squirts) 1) 2) 3) 4) Filter feeders Sessile Solitary species Colony forming species 5 ) Community forming species 6 ) Indirect development through free swimming larva TUNICATE diversity: Ascidiacea (sea squirts) TUNICATE Solitary ascidians are single, discrete individuals that can only reproduce sexually. Species may have separate sexes...
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This note was uploaded on 08/03/2010 for the course BIO 1500 taught by Professor Pandolfi during the Winter '08 term at Wayne State University.

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