Haplocerataceae

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m (Protected "Haplocerataceae" ([move=sysop] (indefinite)))
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The names 'Haplocerataceae' and 'Haploceratidae' are technically invalid, being based on the preoccupied genus name ''Haploceras'' Zittel 1870.
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'''Systematic Paleontology''' <br>
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Subclass [[Ammonoidea]] <br>
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Order [[Ammonitida]] <br>
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Superfamily '''Haplocerataceae'''
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  [[Aptychophora|<==]]‘Haplocerataceae’
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The Haplocerataceae is a superfamily of Jurassic and Cretaceous ammonoid cephalopods characterized by compressed, discoidal shells, often keeled, and commomly with falcoid or falcate ribbing.  The name of the superfamily, and of its contained Haploceratidae are based on the type genus, ''Hapliceras'' Zittel 1870.
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Donovan et al (1981) divided the Haplocerataceae into five families, the Strigoceratidae, Lissoceratidae, Oppeliidae, Haploceratidae, and Binneyitidae.  This differs from the tri-familial classification of Arkell et al in the Treatise (1957) with the splitting of the Lissoceratidae from the Oppeliidae and the removal of the Binneyitidae from the [[Acanthocerataceae]].
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According to Donovan et al (1981) the Oppeliidae and  the Strigoceratidae and possibly the Lissoceratidae are tentatively derived, perhaps separately, from the family Phymatoceratidae in the [[Hildocerataceae]]. This differs from the earlier phylogeny of Arkell, et al (1957) in the Treatise Part L which shows the Haplocerataceae derived from the hildoderatacean Hammatoceratidae. 
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The Oppeliidae is the most durable of the happloceratacean families, ranging from the  Middle Jurassic Bajocian to the Lower Cretaceous Hauterivian. The Strigoceratidae is confined to the Middle Jurassic; the Lissoceratidae is essentially Middle Jurassic but extends into the Upper Jurassic Oxfordian. The Haploceratidae is derivied from the Oppeliidae in the Upper Jurassic Kimmeridgian and extends into the Lower Cretaceous Barramian.. The Binneyitidae is an entirely Cretaceous family that ranges is high as the mid Cretaceous Coniacian.
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== Dendrogram==
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  [[Ammonitida|<==]]‘Haplocerataceae’
     |--Strigoceratidae EK02
     |--Strigoceratidae EK02
     |--‘Haploceratidae’ EK02
     |--‘Haploceratidae’ EK02
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==References==
==References==
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Arkell et al, Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America and Univ. Kansas Press, R.C. Moore ed.
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D.T Donavan, J.H. Callomon, and M.K Howarth. 1981.  Classification of the Jurassic Ammonitina. In ''The Ammonoidea''. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub  Academic Press.
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[EK02] Enseger, T., & H. Keupp. 2002. Phylogeny of the aptychi-possessing Neoammonoidea (Aptychophora nov., Cephalopoda). ''Lethaia'' 34: 79-96.
[EK02] Enseger, T., & H. Keupp. 2002. Phylogeny of the aptychi-possessing Neoammonoidea (Aptychophora nov., Cephalopoda). ''Lethaia'' 34: 79-96.

Latest revision as of 14:05, 27 April 2011

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