-
Flower (1976)
distinguished Middle Ordovician pseudorthocerids from
Silurian and
later pseudorthocerids on the
basis of how the
siphuncle changes during...
-
Spyroceras is a
genus of
pseudorthocerids from the
Devonian of
North America and Europe,
defined by
Alpheus Hyatt in 1884.
Pseudorthocerids are a kind of orthocertaoid...
-
grounds that it
arose from a
different baltoceratid ancestor. The
pseudorthocerids are
thought to be
distinct because their protoconch and
septal necks...
- off as
separate order.
Order †
Orthocerida Includes orthocerids and
pseudorthocerids Order †
Ascocerida Order †
Oncocerida Order †
Discosorida Order † Tarphycerida...
- taxa and a few
groups survived into the
early Mesozoic,
including pseudorthocerids, bactritids,
nautilids and
possibly orthocerids. The last straight-s****ed...
-
Tripteroceroides is a
pseudorthocerid from the
Lower Carboniferous (Mississippian)
belonging to the
family Spyroceratidae .
Pseudorthocerids are
nautiloid cephalopods...
- in the
classification of
major taxa. For instance,
ascocerids and
pseudorthocerids have a
cicatrix and so do not
belong among the neocephalopods. Conversely...
- to
Pennsylvanian orthoconic nautiloid cephalopods included in the
pseudorthocerid family Spyroceratidae,
characterized by tubular, straight-sided, siphuncle...
-
Sceptrites is an
orthoceratoid genus contained within the
pseudorthocerid family Spyroceratidae known by its
slightly compressed,
possibly endogastrically...
- by
Schindewolf in 1943 (Sweet, 1964) and is the type
genus of the
pseudorthocerid family, Pseudactinoceratidae. The type species, P. promiscuum, came...
