Vertebrate(Lecture ppt) Ch 9-2 (10)

Vertebrate(Lecture ppt) Ch 9-2 (10) - Nectocaecilia ,...

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6. Typhlonectidae TAYLOR, 1968 Aquatic caecilians with no tail and a rounded cloacal opening. Dermal scales lacking or very reduced as in Typhlonectes compressicauda . Small tentacles, originating between the nasal opening and the eye. Eye always developed and visible. Premaxillae and septomaxillae fused with nasals, prefrontal fused with maxillae. Temporal fossae present. Viviparous. External gills in larvae form two membranes in contact with the oviduct walls, probably functioning as a "placenta" (Fig. 7). The species Atretochoana eiselti is the only known caecilian lacking lungs. This family has a discontinuos distribution in South America: Orinoco and Amazon drainage basins, Magdalena drainage basin in northern Colombia, Rio La Plata region in Argentina. 5 genera with 12 species. Amazon & Orinoco genera:
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Unformatted text preview: Nectocaecilia , Potomotyphlus . Northern South America: Typhlonectes (see pic 8 in Fig. 5). Rio La Plata region: Chthonerpeton . South America with no known distribution: Atreochoana . Caecilian diversity Figure 7. External gills in the embryo of Typhlonectes compressicauda. Source: Laurent (1986). 無無無 無無無 無無無 無無無 無無無 瞻 瞻 瞻 瞻 ; 瞻 瞻 瞻 Leptodactylidae 瞻 瞻 瞻 瞻 Rhinodermatidae 瞻 瞻 瞻 瞻 瞻 Dendrobatidae 無 無 無 無 Hylidae 瞻 瞻 瞻 Pipidae 瞻 瞻 瞻 瞻 Megophryidae Ranidae 瞻 瞻 瞻 Hylidae 瞻 瞻 瞻 Hylidae 瞻 瞻 瞻 Megophryidae Ranidae 瞻 瞻 瞻 Hylidae 瞻 瞻 瞻 Hylidae 瞻 瞻 瞻 Leptodactylidae 瞻 瞻 瞻 瞻 Hylidae 瞻 瞻 瞻 Aposematic (warning) color Aposematic displays Mimicry Acidity on embryo...
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This note was uploaded on 12/28/2011 for the course LSCI 102 taught by Professor Chien-pingwang during the Fall '11 term at National Cheng Kung University.

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Vertebrate(Lecture ppt) Ch 9-2 (10) - Nectocaecilia ,...

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