| 词条 | Benacoceras |
| 释义 |
|name = Benacoceras |status = fossil |fossil_range = {{fossil range|Kimmeridgian|ref=[1]}} |regnum = Animalia |phylum = Mollusca |classis = Cephalopoda |subclassis = Ammonoidea |superfamilia = Perisphinctaceae |familia = Aspidoceratidae |genus = Benacoceras |genus_authority = Spath, 1925 |subdivision_ranks = Species [2] |subdivision = None Cataloged }} Benacoceras is a strongly ribbed, evolute ammonite from the Late Jurassic, coiled so that all whorls are exposed. Ribbing is biplicate, with very short secondaries. The venter, the outer rim, is smooth, at least on the outer whorl. 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 }} 2. ^{{cite web | title= Paleobiology Database - Benacoceras |authorlink =| coauthors =| year = | url = http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=14613| accessdate = 2014-05-28 }}
2 : Jurassic ammonites|Kimmeridgian life |
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