“Argonauticeras”的意思、由来-开放百科全书

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Argonauticeras

释义

References

{{Italic title}}{{Taxobox
|fossil_range = {{fossil range|Aptian|ref=^[1]}}
|regnum = Animalia
|phylum = Mollusca
|classis = Cephalopoda
|subclassis = Ammonoidea
|ordo = Lytoceratida
|familia = Lytoceratidae
|genus = Argonauticeras
|genus_authority = Anderson 1938 }}

Argonauticeras is an extinct ammonoid cephalopod genus that lived during the latter part of the Early Cretaceous, included in the Lytoceratida and found in lower and possibly middle Aptian marine sediments. It has been thought of as a subgenus of Ammonoceratites.

Argonauticeras produced an evolute shell with a trapezoidal whorl section, slightly impressed inner rim (or dorsum), a somewhat flattened outer rim (venter) and broadly arched sides, covered with fine, weakly crinkled ribs.

References

1. ^{{cite web | last = Sepkoski| first = Jack| title= Sepkoski's Online Genus Database|authorlink =| coauthors =| year = 2002| url = http://strata.geology.wisc.edu/jack/showgenera.php?taxon=231&rank=class| accessdate = 2014-05-28 }}

W.J Arkell et al., 1957. Systematic Descriptions, Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology Part L Ammonoidea.

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