UT Arlington BIOL 3454 - chaetognaths, echinoderms and hemichordates (4 pages)

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chaetognaths, echinoderms and hemichordates



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chaetognaths, echinoderms and hemichordates

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Lecture number:
26
Pages:
4
Type:
Lecture Note
School:
University of Texas at Arlington
Course:
Biol 3454 - General Zoology
Edition:
1

Unformatted text preview:

BIOL 3454 1nd Edition Lecture 26 Lecture 11 19 I II III IV V VI Chaetognaths Echinoderms Hermichordates Mixed characteristics a Not all taxa are protostome or deuterostome features b Chateognaths mixed Chinoderms have a strange body plan a Bilateral ancestor and radial as adults b Coelom modified into a water vascular system for movement c Free moving but radial Phylum Chaetognatha a Arrow worms b Roots Greek chaite long flowing hair gnathos jaw c All marine d Swim to surface at night and descend during the day e Predatory f Form and function i Unsegmented ii Body plan head trunk and postanal tail iii Vestibule depression beneath the head iv Dorsally located eyes v Only invertebrates with a many layer epidermis vi Highly mobile and nearly transparent can have significant ecological impact vii Complete digestive system and well developed coelom viii U shaped ciliary loop over neck and from back of head mechanoreceptive or chemosensory ix No respiratory or excretory systems x Hermaphroditic self or reciprocal cross fertilization xi Deuterostomes but share characteristics with both groups of phyla Phylum Xenoturbellida a Hard to place taxonomy b Deuterostomes c Single genus with 2 species d Live in N sea mud e Feed on bivalves and bivalve eggs f Sexual reproduction with no structured gonads Phylum Echinodermata a Water vascular system of coelomic origin that doubles as part of respiratory system b Unsegemented with pentraradial symmetry c Triploblastic and coelom extensive d Endoskeleton of dermal calcareous ossicles 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 e f g h i j k l m n o p q r Digestive system usually complete axial or coiled Bo brain but extensive nerve ring Regeneration prominent Asexual reproduction by fragmentation Separate sexes free swimming bilateral larval stages Excretory organs absent Blood vascular system very reduced Circulation by



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