-
Perisphinctidae is a
family of
Middle and
Upper Jur****ic
discoidal ammonites in the
order Ammonitida. They have a s****
morphology that is
mostly evolute...
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Perisphinctidae:
Middle and
Upper Jur****ic root stock,
derived from the
Stephanoceratidae (Middle Jur****ic
direct derivatives of the
Perisphinctidae)...
-
superfamily Perisphinctoidea.
Previously Ataxioceras was ****igned to the
Perisphinctidae but has now been
placed in the
Ataxioceratidae for
which it is the...
- Ammonitida)
found in England, Germany, and Switzerland,
belonging to the
Perisphinctidae. The s**** is
strongly embracing,
tending to be
oxyconic (sharp rimmed)...
-
Flabellisphinctes is
included in the
subfamily Grossouviinae which is part of the
Perisphinctidae. The s**** is
around 5 cm (abt. 2in) in diameter, with
close spaced...
-
outer whorls become smooth and
sutures tend to
resemble those of the
Perisphinctidae. The
family includes three genera, Megalytoceras, and Metrolytoceras...
- (2024). "First
Records of
Early Bajocian Leptosphinctes (Ammonoidea:
Perisphinctidae) in the
Northern Caucasus, Russia".
Paleontological Journal. 58 (6):...
- class:
Cephalopoda Subclass: †Ammonoidea Order: †Ammonitida Family: †
Perisphinctidae Subfamily: †Perisphinctinae Genus: †Alligaticeras Buckman, 1923...
- class:
Cephalopoda Subclass: †Ammonoidea Order: †Ammonitida Family: †
Perisphinctidae Subfamily: †Perisphinctinae Genus: †Perisphinctes Waagen, 1869 Type...
- tubercles. The
Aspidoceratidae are
thought to be
derived from the
Perisphinctidae and have been
subdivided into
three subfamilies, the Aspidoceratinae...
