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Furcacauda is a genus of thelodontid agnathan from the Lower Devonian of Canada, and is the type genus of the order Furcacaudiformes. Furcacaudiform thelodontids were deep water jawless vertebrates with symmetrical fork and lobed-finned tails and scales smaller than typical loganellid and nikoliviid thelodonti scales. Furcacaudiform thelodonts are noted as having a laterally compressed body, large anterior eyes, slightly posterior, lateral, and vertical to a small mouth, and a condensed curved row of branchial openings (gills) directly posterior to the eyes. Many but not all had laterally paired fins. Wilson and Caldwell also note the presence of a caudal peduncle and a long caudal fin made of two large lobes, one dorsal and one ventral separated by 8 to 14 smaller intermediate lobes, givi

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  • Furcacauda (en)
  • 福尔卡鱼属 (zh)
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  • 福尔卡鱼屬（屬名：Furcacauda，或也依學名稱作叉尾花鱗魚）是已灭绝的一种生物，生存于志留纪至泥盆纪的加拿大。全長約 9 公分。身體寬扁，鰓孔位於眼後方，口小，可能具有葉狀鰭。尾部有極明顯的分叉，從分叉間的棘狀構造推測可能有近似帆狀的構造，尾部整體可能呈半月形。 其近親通常沒有太複雜的生理構造，多從口直接接通到肛門；但福尔卡鱼的體內具有類似胃的結構，可能已經具有簡單的消化系統。 (zh)
  • Furcacauda is a genus of thelodontid agnathan from the Lower Devonian of Canada, and is the type genus of the order Furcacaudiformes. Furcacaudiform thelodontids were deep water jawless vertebrates with symmetrical fork and lobed-finned tails and scales smaller than typical loganellid and nikoliviid thelodonti scales. Furcacaudiform thelodonts are noted as having a laterally compressed body, large anterior eyes, slightly posterior, lateral, and vertical to a small mouth, and a condensed curved row of branchial openings (gills) directly posterior to the eyes. Many but not all had laterally paired fins. Wilson and Caldwell also note the presence of a caudal peduncle and a long caudal fin made of two large lobes, one dorsal and one ventral separated by 8 to 14 smaller intermediate lobes, givi (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Furcacauda_fredholmae.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Furcacauda_heintzae.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Furcacauda_heintzae.jpg
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classis
  • †Thelodonti (en)
familia
  • †Furcacaudidae (en)
fossil range
  • Lower Devonian (en)
genus
  • †Furcacauda (en)
genus authority
  • Sepkoski, 2002 (en)
image caption
  • Furcacauda heintzae (en)
ordo
  • †Furcacaudiformes (en)
phylum
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  • Animalia (en)
subdivision
  • *Furcacauda heintzae *Furcacauda fredholmae (en)
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  • Sigurdia heintzae (en)
has abstract
  • Furcacauda is a genus of thelodontid agnathan from the Lower Devonian of Canada, and is the type genus of the order Furcacaudiformes. Furcacaudiform thelodontids were deep water jawless vertebrates with symmetrical fork and lobed-finned tails and scales smaller than typical loganellid and nikoliviid thelodonti scales. Furcacaudiform thelodonts are noted as having a laterally compressed body, large anterior eyes, slightly posterior, lateral, and vertical to a small mouth, and a condensed curved row of branchial openings (gills) directly posterior to the eyes. Many but not all had laterally paired fins. Wilson and Caldwell also note the presence of a caudal peduncle and a long caudal fin made of two large lobes, one dorsal and one ventral separated by 8 to 14 smaller intermediate lobes, giving the appearance of a striated half-moon shaped tail resembling the tail of a heterostracan. A large square cavity within the gut connecting a small intestine to an anal opening lead many to believe that it is this genus that exhibits the first vertebrate stomach. According to Wilson and Caldwell their discovery, based on sediment infillings of fossils of the Furcacauda heintze, gives credence to the evolutionary development of stomach before jaws. (en)
  • 福尔卡鱼屬（屬名：Furcacauda，或也依學名稱作叉尾花鱗魚）是已灭绝的一种生物，生存于志留纪至泥盆纪的加拿大。全長約 9 公分。身體寬扁，鰓孔位於眼後方，口小，可能具有葉狀鰭。尾部有極明顯的分叉，從分叉間的棘狀構造推測可能有近似帆狀的構造，尾部整體可能呈半月形。 其近親通常沒有太複雜的生理構造，多從口直接接通到肛門；但福尔卡鱼的體內具有類似胃的結構，可能已經具有簡單的消化系統。 (zh)
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