-
Orthoceratidae is an
extinct family of
actively mobile carnivorous cephalopods,
subclass Nautiloidea, that
lived in what
would be
North America, Europe...
- by
Foeste in 1932 is the
ancestral and
characteristic genus of the
Michelinoceratidae,
established and
described by
Flower in 1946;
derived from
empty siphuncle...
- coleoids, ammonoids, and bactritids, but also some
orthocerid families:
Michelinoceratidae, Sphaerorthoceratidae, Arionoceratidae, "and
probably other groups...
-
along with
related genera in what he
called the "already
overcrowded Michelinoceratidae".
Sweet (1964) in the
Treatise presented kionoceratids as a subfamily...
- are
michelinocerids (Orthocerida) with the
internal pattern of the
Michelinoceratidae except that the
siphuncle segments,
which are
generally tubular, are...
-
Arionoceras was
named by
Barskov (1966) and
originally ****igned to the
Michelinoceratidae, but
attributed by
Serpagli and
Gnoli (1977) -ibid to the Geisonoceratidae...
-
Early Ordovician of
Western Utah, ****igned to the
orthocerid family,
Michelinoceratidae S**** of
Wardoceras are
smooth and orthoconic, with a
circular cross...
-
taxon and
called attention to the
morphologic gradation between the
Michelinoceratidae in
which cameral deposits are ****ed and the
Geistonoceratidae in...
- "vacuosiphonate".
Empty siphuncled forms, the vacuosiphonate, gave rise to the
Michelinoceratidae,
commonly known as the Orthoceratidae,
which has its
beginning in...
