UT Arlington BIOL 3454 - chaetognaths, echinoderms and hemichordates (2 pages)

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chaetognaths, echinoderms and hemichordates



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chaetognaths, echinoderms and hemichordates

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description of chaetognaths, echinoderms and hemichordate


Lecture number:
27
Pages:
2
Type:
Lecture Note
School:
University of Texas at Arlington
Course:
Biol 3454 - General Zoology
Edition:
1

Unformatted text preview:

BIOL 3454 1nd Edition Lecture 27 Lecture 11 21 o Class Crinoidea 625 species Sea lilies feather stars Flower shaped body at tip of stalk rare among echinoderms in that they are rare among echinoderms in that they are attached much of their life Some deep water most shallow water around reefs Form and function Disc called a calyx with leathery skin called tegmen with calcareous plates Calyx and arms together called a crown attached to a long jointed stalk in sessile forms Oral surface with a mouth to short esophagus to long intestine with folds called diverticula to an anus which may be on a raised cone Ambulacral grooves are open ciliated and carry food to mouth Water vascular system functions entirely on coelomic fluid NS has an oral ring and a radial nerve for each arm Separate sexes Gonads masses of cells in arms Larvae dolioloarium Phylum Hemichordata o Roots Greek hemi half chorda string or chord o Used to be a subphylum of the chordates o Have a buccal diverticulum that functions for support called stomochord o Bottom dwellers live in secreted tubed in marine sediments o Class Enteropneusta Acorn worms Live in burrows in sand and mud Mucus covered body with 3 regions proboscis short collar and a long trunk Probosicis feeds through ciliated grooves excavates burrows has small coelomic sac called a protocoel that leads to buccla dicerticulum Gill pores on each side of trunk behind collar for reparation lead to U shaped gill slits Exchange across epithelium Middorsal blood vessel carries colorless blood enters a network of sinuses called glomerulus has an excretory function Dorsal nerve chord similar to chordates rest of NS relatively simple similar to cnidarians and echinoderms These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute o Separate sexes One species asexual reproduction Fertilization external Larval tornaria stage in some Class Pterobrachia Similar to



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