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The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of the Ancyloceratina is the tendency for most of them to have shells that are not regular spirals like most other ammonites. These irregularly-coiled ammonites are called heteromorph ammonites, in contrast to regularly coiled ammonites, which are called homomorph ammonites.

AttributesValues
rdf:type
rdfs:label
  • Ancyloceratina (en)
  • Ancyloceratina (fr)
  • Ancyloceratina (it)
  • アンキロセラス亜目 (ja)
  • Ancyloceratina (nl)
  • Ancyloceratina (pl)
  • 勾菊石亞目 (zh)
rdfs:comment
  • The Ancyloceratina were a diverse suborder of ammonite most closely related to the ammonites of order Lytoceratina. They evolved during the Late Jurassic but were not very common until the Cretaceous period, when they rapidly diversified and became one of the most distinctive components of Cretaceous marine faunas. They have been recorded from every continent and many are used as zonal or index fossils. The most distinctive feature of the majority of the Ancyloceratina is the tendency for most of them to have shells that are not regular spirals like most other ammonites. These irregularly-coiled ammonites are called heteromorph ammonites, in contrast to regularly coiled ammonites, which are called homomorph ammonites. (en)
  • Les Ancyloceratina sont un sous-ordre éteint de mollusques céphalopodes marins de l'ordre des Ammonitida (sous-classe des Ammonoidea). La plupart de ces espèces se caractérisent par une coquille dite « déroulée », les tours n'étant pas en contact. (fr)
  • アンキロセラス亜目(アンキロセラスあもく、Ancyloceratina)は、アンモナイト亜綱アンモナイト目に属する頭足類の亜目の一つ。後期ジュラ紀に出現した。後期白亜紀には本亜科のうち特にノストセラス科が爆発的に多様化し、日本をはじめ北太平洋地域のアンモナイトを代表する分類群となった。アンキロセラス亜目の属種には異常巻きアンモナイトが多い。 (ja)
  • Ancyloceratina - podrząd głowonogów z podgromady amonitów. (pl)
  • 勾菊石亞目(學名:Ancyloceratina)是一類多樣化的菊石,菊石目下的近親。牠們於中生代侏羅紀晚期開始演化,至白堊紀期間非常普遍及多樣化,至新生代古新世灭绝。牠們遍佈各大洲,可以作為指準化石。大部份勾菊石亞目的殼都不是螺旋狀,故屬於異形菊石。 (zh)
  • Gli Ancyloceratina sono un sottordine di cefalopodi appartenente alle estinte ammoniti (ordine Ammonoidea). Questo gruppo riunisce tutte le forme di ammoniti cosiddette eteromorfe vissute dal tardo Giurassico Superiore (Titoniano) al Cretacico Superiore (Maastrichtiano). Queste forme sono caratterizzate da tipi di avvolgimento della conchiglia che si discostano in tutto o in parte dal modello di avvolgimento più frequente negli ammonoidi, di tipo planispirale (il cui avvolgimento giace nel piano di simmetria bilaterale dell'organismo), con i giri della conchiglia a contatto o parzialmente sovrapposti. (it)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/Hamites.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Ammonite_cemetery.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Crioceratites_nolani_France_450_mm.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Nipponites_mirabilis_Musée_des_Confluences_18_10_2015_1.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Scaphite_180308.jpg
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