| 词条 | Strandoceras |
| 释义 |
| name = Strandoceras | fossil_range = M -U Ordovician | image = | regnum = Animalia | phylum = Mollusca | classis = Cephalopoda | subclassis = Nautiloidea | ordo = Discosorida | familia = Cyrtogomphoceratidae | genus = Strandoceras | genus_authority = Flower, 1940 }} Strandoceras is a strongly curved cyrtogomphoceratid with a laterally compressed cross section from the middle and upper Ordovician of Northern Europe; Estonia, Norway, the U.K. The body chamber of Stradoceras is straighter and more slender than the chambered phragmocone; the venter narrowly rounded with a shallow hyponomic sinus; the aperture open, sutures with shallow lateral lobes. The siphuncle is close to the venter which is on the inside, endogastric curvature. Segments are large and broadly rounded; connecting rings thick, bullettes large. Strandoceras gave rise to the Phragmoceratidae and very likely to Kiaeroceras and Cyrtogomphoceras, which in turn gave rise to Landeroceras, within the CyrtogomphoceratidaeReferences
3 : Discosorida|Middle Ordovician first appearances|Late Ordovician extinctions |
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