Amaltheidae
Amaltheidae is a family of eoderoceratoidean ammonitids from the Lower Jurassic consisting of genera characterised by stigated discoidal oxycones—narrow involute shells with narrowly rounded to angular venters that bear a series of grooves, or ridges, along broad flanks, which according to the Treatise L, 1957, evolved into strongly ribbed planulates (discoidal evolute shells) with quadrate whorls, typically with crenulated keels; involving all together four genera. Amaltheus is oxyconic, keeled, strigated, and ribbed on the outer flanks.
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Amaltheidae
Amaltheidae is a family of eoderoceratoidean ammonitids from the Lower Jurassic consisting of genera characterised by stigated discoidal oxycones—narrow involute shells with narrowly rounded to angular venters that bear a series of grooves, or ridges, along broad flanks, which according to the Treatise L, 1957, evolved into strongly ribbed planulates (discoidal evolute shells) with quadrate whorls, typically with crenulated keels; involving all together four genera. Amaltheus is oxyconic, keeled, strigated, and ribbed on the outer flanks.
has abstract
Amaltheidae is a family of eod ...... incipally boreal distribution.
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Wikipage page ID
29,676,419
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1,020,371,573
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authority
Hyatt, 1867
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fossil range
Late Pliensbachian,
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image caption
Pleuroceras sp. from Germany
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subdivision
* Amaltheus (de Montfort, 1808)
* Amauroceras
* Pleuroceras (Hyatt, 1868)
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subdivision ranks
Genera
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taxon
Amaltheidae
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subject
hypernym
comment
Amaltheidae is a family of eod ...... nd ribbed on the outer flanks.
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label
Amaltheidae
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