Aspidoceras
Encyclopedia
Aspidoceras is an extinct ammonoid cephalopod genus that lived during the Late Jurassic
(Kimmeridgian) with a fairly broad distribution. Aspidoceras, named by Zittel, 1868, is the type genus for the persphictacian
family Aspidoceratidae
and subfamily Aspidoceratinae
in which it is included.
Aspidoceras has an evolute shell with quadrate-rounded or depressed whorls that have two rows of tubercles, the outer near the middle of the whorl sides. The outer row soon fades in many species. Some species are also ribbed. The venter, or outer rim, is generally wide and broadly arched.
Aspidoceras is predated by Euaspidoceras, possibly its ancestor, and is considered related to genera like Orthaspidoceras, Simaspidoceras, and Intranodites.
Late Jurassic
The Late Jurassic is the third epoch of the Jurassic Period, and it spans the geologic time from 161.2 ± 4.0 to 145.5 ± 4.0 million years ago , which is preserved in Upper Jurassic strata. In European lithostratigraphy, the name "Malm" indicates rocks of Late Jurassic age...
(Kimmeridgian) with a fairly broad distribution. Aspidoceras, named by Zittel, 1868, is the type genus for the persphictacian
Perisphinctaceae
Perisphinctoidea, formerly Perisphinctaceae, is a superfamily of Middle Jurassic to Lower Cretaceous ammonites, commonly with evolute shells with strong ribbing that typically divides about mid flank before crossing the venter....
family Aspidoceratidae
Aspidoceratidae
The Aspidoceratidae comprise a family of middle and upper Jurassic ammonites that make up part of the superfamily Perisphinctaceae, characterized by evolute shells, commonly stocky, that tend to develop tubercles....
and subfamily Aspidoceratinae
Aspidoceratinae
The Aspidoceratinae is a subfamily in the perisphictacean ammonite family, Aspidoceratidae found world wide in middle and upper Jurassic sediments....
in which it is included.
Aspidoceras has an evolute shell with quadrate-rounded or depressed whorls that have two rows of tubercles, the outer near the middle of the whorl sides. The outer row soon fades in many species. Some species are also ribbed. The venter, or outer rim, is generally wide and broadly arched.
Aspidoceras is predated by Euaspidoceras, possibly its ancestor, and is considered related to genera like Orthaspidoceras, Simaspidoceras, and Intranodites.