Encoiloceras
Encyclopedia
Encoiloceras is a Tainoceratid
genus, a nautiloid cephalopod in the order Nautilida
that has been found in Upper Triassic
(Carnian
) sediments in the Alps
and Hungary
.
Encoiloceras has an evolute shell with a wide umbilicus and large umbilical perforation in the middle. The whorl section is subquadrate with a rounded venter. Flanks bear thick, foldlike, ribs that thicken at the ventral shoulders. The suture has shallow lobes on all sides and the supuncle is close to the dorsum, i.e to the inner rim.
Encoiloceras is similar to Anoploceras
in that both have pronounced ribbing, although stronger in Encoiloceras, but differs in that Encoiloceras has a wide umbilical perforation, lacking in Anoploceras. It is also similar to Enoploceras
in that Enoploceras also has an umbilical perforation, altlhough smaller, and lacks the strong ribbing of Encoiloceras.
Tainoceratidae
The Tainoceratidae is a family of late Paleozoic and Triassic nautiloids that are a part of the order Nautilida, characterized by large, generally evolute shells with quadrate to rectangular whorl sections...
genus, a nautiloid cephalopod in the order Nautilida
Nautilida
The Nautilida constitute a large and diverse order of generally coiled nautiloid cephalopods that began in the mid Paleozoic and continues to the present with a single family, the Nautilidae which includes two genera, Nautilus and Allonautilus, with six species...
that has been found in Upper Triassic
Triassic
The Triassic is a geologic period and system that extends from about 250 to 200 Mya . As the first period of the Mesozoic Era, the Triassic follows the Permian and is followed by the Jurassic. Both the start and end of the Triassic are marked by major extinction events...
(Carnian
Carnian
The Carnian is the lowermost stage of the Upper Triassic series . It lasted from about 228.7 till 216.5 million years ago . The Carnian is preceded by the Ladinian and is followed by the Norian...
) sediments in the Alps
Alps
The Alps is one of the great mountain range systems of Europe, stretching from Austria and Slovenia in the east through Italy, Switzerland, Liechtenstein and Germany to France in the west....
and Hungary
Hungary
Hungary , officially the Republic of Hungary , is a landlocked country in Central Europe. It is situated in the Carpathian Basin and is bordered by Slovakia to the north, Ukraine and Romania to the east, Serbia and Croatia to the south, Slovenia to the southwest and Austria to the west. The...
.
Encoiloceras has an evolute shell with a wide umbilicus and large umbilical perforation in the middle. The whorl section is subquadrate with a rounded venter. Flanks bear thick, foldlike, ribs that thicken at the ventral shoulders. The suture has shallow lobes on all sides and the supuncle is close to the dorsum, i.e to the inner rim.
Encoiloceras is similar to Anoploceras
Anoploceras
Anoploceras is a Middle and Upper Triassic nautiloid included in the Tainoceratidae, known from eastern Europe. The shell is evolute with only a slight overlap of previous whorls. Whorl section is subquadrate, like Pleuronautilus, only depressed. Flanks have conspicuous ribs that may be somewhat...
in that both have pronounced ribbing, although stronger in Encoiloceras, but differs in that Encoiloceras has a wide umbilical perforation, lacking in Anoploceras. It is also similar to Enoploceras
Enoploceras
Enoploceras is a Tainoceratid genus, a nautiloid cephalopod in the order Nautilida, known from Triassic sediments in Europe, India, Timor, and the state of Idaho....
in that Enoploceras also has an umbilical perforation, altlhough smaller, and lacks the strong ribbing of Encoiloceras.
References
- Bernhard Kummel, 1964. Nautiloidea-Nautilida. Treatise on Invertebrate Paleontology, Part K. Geological Soc. of America and University of Kansas press. Teichert and Moore (eds)