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Statements

Subject Item
dbr:Riocerida
rdfs:label
Riocerida
rdfs:comment
Riocerida, originally named as Rioceratida, is an extinct order of Ordovician nautiloid cephalopods. They were the earliest-diverging members of the major group Orthoceratoidea, with which they share dorsomyarian muscle scars (a few large muscle scars concentrated at the top of the body chamber). However, they also possess several plesiomorphic ("primitive") traits which are absent in other orthoceratoids: Cameral and endosiphuncular deposits are absent, and the siphuncle has a marginal position along the lower edge of the shell. The conch (external shell) shape is slender, usually orthoconic (straight) or weakly cyrtoconic (slightly curved). The monophyly of Riocerida as a unique group is plausible but difficult to confirm, and they may instead be a paraphyletic grade or polyphyletic asse
dcterms:subject
dbc:Prehistoric_cephalopod_orders dbc:Orthoceratoidea dbc:Early_Ordovician_first_appearances dbc:Prehistoric_nautiloids dbc:Late_Ordovician_extinctions
dbo:wikiPageID
70918547
dbo:wikiPageRevisionID
1090876065
dbo:wikiPageWikiLink
dbr:Plesiomorphic dbr:Ordovician dbr:Nautiloid dbr:Polyphyly dbr:Orthocone dbc:Prehistoric_cephalopod_orders dbr:Paraphyletic dbc:Orthoceratoidea dbr:Monophyly dbr:Cephalopod dbr:Rioceratidae dbc:Early_Ordovician_first_appearances dbr:Evolutionary_grade dbr:Endosiphuncular_deposits dbr:Bactroceratidae dbc:Late_Ordovician_extinctions dbc:Prehistoric_nautiloids dbr:Cameral_deposit dbr:Orthoceratoidea dbr:Siphuncle dbr:Body_chamber
owl:sameAs
wikidata:Q112577892 n11:GSzAT
dbp:wikiPageUsesTemplate
dbt:Short_description dbt:Reflist dbt:Automatic_taxobox dbt:Fossil_range
dbp:authority
King & Evans, 2019
dbp:subdivision
*Bactroceratidae *Rioceratidae
dbp:subdivisionRanks
Families
dbp:taxon
Riocerida
dbo:abstract
Riocerida, originally named as Rioceratida, is an extinct order of Ordovician nautiloid cephalopods. They were the earliest-diverging members of the major group Orthoceratoidea, with which they share dorsomyarian muscle scars (a few large muscle scars concentrated at the top of the body chamber). However, they also possess several plesiomorphic ("primitive") traits which are absent in other orthoceratoids: Cameral and endosiphuncular deposits are absent, and the siphuncle has a marginal position along the lower edge of the shell. The conch (external shell) shape is slender, usually orthoconic (straight) or weakly cyrtoconic (slightly curved). The monophyly of Riocerida as a unique group is plausible but difficult to confirm, and they may instead be a paraphyletic grade or polyphyletic assemblage ancestral to all later orthoceratoids.
prov:wasDerivedFrom
wikipedia-en:Riocerida?oldid=1090876065&ns=0
dbo:wikiPageLength
2582
foaf:isPrimaryTopicOf
wikipedia-en:Riocerida