-
tightly coiled, but
evolute with all
whorls showing. The body
chamber of
tarphycerids is
typically long and tubular, as much as half the
length of the containing...
-
Ordovician of
North America and
Australia and is one of the
earlier tarphycerids found in the
Lower Ordovician El Paso
Group in New Mexico. Aphetoceras...
-
nautiloid genus from the
Middle Ordovician and type for the
Lituitidae (a
tarphycerid family) that in some more
recent taxonomies has been
classified with...
-
Magdoceras is a
genus of Late/Upper
Silurian tarphycerids, a kind of
nautiloid cephalopod with a
coiled s****.
Magdoceras Fossilworks entry. Jack Sepkoski...
- Trocholites, an
tarphycerid from the
Upper Ordovician of Wisconsin...
- as
evolutionarily unlikely.
Lituites and the
Lituitidae are
derived tarphycerids and
belong to a
separate evolutionary branch of nautilioids. The number...
-
ultimate portion is
slightly divergent, not an
uncommon characteristic of
tarphycerids.
Harmanoceras was
named by
Teichert and
Glenister in 1952. The type us...
- ancestor).
Barrandeocerina is
retained as a
parking place for
evolved tarphycerids with thin
connecting rings. Flower, R.H. & Kummel, B. 1950. A classification...
-
Tarphycerida by a
straightening of the
adult s****, a
common character of many
tarphycerids. The Dissidocerida,
separated from the
Orthocerida by
Zhuravleva (1964)...
-
family of
Middle and
Upper Ordovician Barrandeocerina, (a
suborder of
tarphycerids),
characterized by
curved or coiled, smooth,
transversely marked, or...
