LABMIDTERM - Key Invertebrate Phyla Characteristics...

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Key Invertebrate Phyla Characteristics Porifera Cnidarian Platyhelmint hes Nematoda Annelida Mollusca Arthropoda Echin Example organism Genus species And small thumbnail pic. Aplysina archeri Apolemia uvaria Pseudoceros ferrugineus Mermis nigrescens Chaetopterus variopedatus Dinocardium robustum Acherontia atropos Astrop articu # tissue layers; types present 0 ; NONE 2 ; ECTODERM ENDODERM 3 ; ECTODERM ENDODERM MESODERM 3 ; ECTODERM ENDODERM MESODERM 3 ; ECTODERM ENDODERM MESODERM 3 ; ECTODERM ENDODERM MESODERM 3 ; ECTODERM ENDODERM MESODERM 3 ; ECTOD ENDOD MESOD Tissue vs. organ level development CELLULAR – LACK TISSUES AND ORGANS TISSUES – LACK ORGANS ORGAN SYSTEM ORGAN SYSTEM ORGAN SYSTEM ORGAN SYSTEM ORGAN SYSTEM ORGAN True muscle cells NO NO YES YES YES YES YES YES Symmetry; cephalization ABSENT ; ABSENT RADIAL ; ABSENT BILATERAL ; PRESENT BILATERAL; PRESENT BILATERAL; PRESENT BILATERAL; PRESENT BILATERAL SYMMETRY; PRESENT RADIA SYMM ABSEN Coelom type ACOELOMATES ACOELOMATES ACOELOMATES
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This note was uploaded on 03/22/2011 for the course BIOLOGY 1407 taught by Professor Dr.janowski-bell during the Spring '11 term at The Victoria College.

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LABMIDTERM - Key Invertebrate Phyla Characteristics...

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