Prolecanitida is an order of extinct ammonoid cephalopods with discoidal to thinly lenticular shells with goniatitic or ceratitic sutures and which retained the simple retrochoanitic siphuncle with backward extending septal necks. As typical for ammonoids the siphuncle is along the ventral margin. Prolecanitids form a relatively small and stable order within the Ammonoidea with 43 named genera and about 1250 species, but with a long-ranging lineage of about 108 m.y. stretching from the Lower Carboniferous to the Triassic. Although not as diverse as their goniatitid contemporaries, the Prolecanatida provided the stock from which all later Mesozoic ammonoids were derived.
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| - Prolecanitida (en)
- Prolecanitida (it)
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| - Prolecanitida is an order of extinct ammonoid cephalopods with discoidal to thinly lenticular shells with goniatitic or ceratitic sutures and which retained the simple retrochoanitic siphuncle with backward extending septal necks. As typical for ammonoids the siphuncle is along the ventral margin. Prolecanitids form a relatively small and stable order within the Ammonoidea with 43 named genera and about 1250 species, but with a long-ranging lineage of about 108 m.y. stretching from the Lower Carboniferous to the Triassic. Although not as diverse as their goniatitid contemporaries, the Prolecanatida provided the stock from which all later Mesozoic ammonoids were derived. (en)
- I Prolecanitida Miller e Furnish, 1954 sono un ordine di cefalopodi estinti appartenenti agli Ammonoidea (ammoniti in senso lato), vissuti dal Devoniano Superiore al Triassico Inferiore. Si tratta di cefalopodi dotati di conchiglia esterna (ectococleati), con camere interne collegate da un sifone che permetteva all'animale di introdurre nelle camere stesse gas e liquido tramite un processo osmotico per variare il proprio galleggiamento. L'animale viveva solo nell'ultima camera, la più ampia (camera d'abitazione). (it)
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| - *Prolecanitoidea
*Medlicottioidea (en)
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| - Prolecanitida is an order of extinct ammonoid cephalopods with discoidal to thinly lenticular shells with goniatitic or ceratitic sutures and which retained the simple retrochoanitic siphuncle with backward extending septal necks. As typical for ammonoids the siphuncle is along the ventral margin. Prolecanitids form a relatively small and stable order within the Ammonoidea with 43 named genera and about 1250 species, but with a long-ranging lineage of about 108 m.y. stretching from the Lower Carboniferous to the Triassic. Although not as diverse as their goniatitid contemporaries, the Prolecanatida provided the stock from which all later Mesozoic ammonoids were derived. (en)
- I Prolecanitida Miller e Furnish, 1954 sono un ordine di cefalopodi estinti appartenenti agli Ammonoidea (ammoniti in senso lato), vissuti dal Devoniano Superiore al Triassico Inferiore. Si tratta di cefalopodi dotati di conchiglia esterna (ectococleati), con camere interne collegate da un sifone che permetteva all'animale di introdurre nelle camere stesse gas e liquido tramite un processo osmotico per variare il proprio galleggiamento. L'animale viveva solo nell'ultima camera, la più ampia (camera d'abitazione). (it)
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