Heminautilus

{{Taxobox

| name = Heminautilus

| fossil_range = Aptian
~{{fossil range|125|112}}

| image =

| regnum = Animalia

| phylum = Mollusca

| classis = Cephalopoda

| subclassis = Nautiloidea

| ordo = Nautilida

| superfamilia = Nautilaceae

| familia = Cenoceratidae

| genus = Heminautilus

| genus_authority = Spath 1927

| subdivision_ranks = Species

| subdivision =

H. boselliorum
H. etheringtoni
H. japonicus
H. lallierianus
H. rangei
H. sanctaecrucis
H. saxbii
H. stantoni
H. tejeriensis
H. tyosiensis
H. verneuilli

}}

Heminautilus is an extinct genus of nautiloids from the nautilacean family Cenoceratidae that lived during the Early Cretaceous. Fossils of Heminautilus have been registered in rocks of Barremian and Aptian age.[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=13210 Heminautilus] at Fossilworks.org Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species.

Heminautilus has a discoidal compressed involute shell with flanks converging on a narrow flattened outer margin, the venter. Whorls are higher than they are wide. The suture is sinuous with a ventral lobe, subtriangular saddles on the ventral shoulders, broad lateral lobes, and narrow rounded saddles on the umbilical shoulders. The siphuncle is subcentral.{{Not a typo|Kummel}}, 1964

Species

The following species of Heminautilus have been described:

H. boselliorum
H. etheringtoni
H. japonicus
H. lallierianus
H. rangei
H. sanctaecrucis
H. saxbii
H. stantoni
H. tejeriensis
H. tyosiensis
H. verneuilli

Distribution

Fossils of Heminautilus have been found in Bulgaria, Colombia (at Caballos Formation, Boyacá, Tolima and Une Formation),Baudouin et al., 2016, p.87 Egypt,Baudouin, 2016, p.76 France, Hungary,Baudouin, 2016, p.66 Japan, Mexico, Spain, Switzerland, Tunisia,Baudouin, 2016, p.72 the United Kingdom, the United States (Arkansas), Venezuela.

References

= Bibliography =

{{cite journal|last1=Baudouin|first1=Cyril|last2=Delanoy|first2=Gérard|last3=Moreno Bedmar|first3=Josep Antón|last4=Pictet|first4=Antoine|last5=Vermeulen|first5=Jean|last6=Conte|first6=Gabriel|last7=Gonnet|first7=Roland|last8=Boselli|first8=Patrick|last9=Boselli|first9=Marc|year=2016|title=Revision of the Early Cretaceous genera Heminautilus SPATH, 1927, and Josanautilus MARTÍNEZ & GRAUGES, 2006 (Nautilida, Cenoceratidae)|url=http://paleopolis.rediris.es/cg/1605/CG1605.pdf|journal=Carnets de Géologie|volume=16|issue=5 |pages=61–212|access-date=2017-01-20|doi=10.4267/2042/58977|doi-access=free}}
{{cite book |last=Kummel |first=B. |year=1964 |title=Nautiloidea -Nautilida |work=Treatise on Invertebrate Paleontology |publisher=Geological Society of America and University of Kansas Press}}

Heminautilus

Species

Distribution

See also

References

= Bibliography =

Further reading