The Haloritidae is a family of subglobular, involute, Triassic
ammonoids
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family N ...
belonging to the ceratitid superfamily
Tropitoidea
Tropitoidea, formerly Tropitaceae, is an extinct superfamily of ammonite cephalopods in the order Ceratitida, containing the following families:
* Didymitidae
* Episculitidae
* Haloritidae
* Juvavitidae
* Parathisbitidae
* Thisbitidae
* Tropicel ...
. Their shells may be smooth or may have ribs that cross or are interrupted on the venter, and may have nodes. Keels and ventral furrows are not typical. The last volution is commonly eccentric. The Suture may be ammonitic, ceratitic, or goniatitic.
In the present classification of the Haloritidae, the family is divided into two subfamilies, the Haloritinae and the Juvavitinae. In the older classification of the Treatise (1957) the Haloriitidae was divided into three subfamilies, the Haloritinae, with spiral ornamentation weak or absent, the Sagenitinae with prominent spiral ornamentation and a more subdivided suture reassigned to the
Pinacocerataceae
Pinacoceratoidea, formerly Pinacocerataceae, are generally smooth, compressed, evolute to involute ammonoids from the Triassic, belonging to the Ceratitida, in which the suture is ammonitic, with adventitious and auxiliary elements.
As presently ...
as the
Sagenitidae, and the Episculitinae with a simplified suture and uncoiling of the body chamber
The present
Haloritinae includes ''
Halorites
''Halorites'' is an extinct genus of Triassic ammonoids belonging to the family Haloritidae.
Fossil record
This genus is known in the fossil record of the Triassic (from about 212 to 205.6 million years ago). Fossils of species within this genus ...
'', the type, ''
Amarassites
''Amarassites'' is an extinct genus of cephalopods belonging to the ammonite
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttl ...
'', ''
Gnomohalorites'', ''
Paraguembelites'', and ''
Parajuvavites''. The
Juvatinae includes ''
Juvavites'', type, ''
Dimorphites'', and ''
Gonionotites'', included in the original Haloritinae. The Episcultinae of the original Haloritidae has become the
Episculitidae, still in the Tropitoidea.
References
*
Treatise on Invertebrate Paleontology
The ''Treatise on Invertebrate Paleontology,'' published from 1953–2007 by the Geological Society of America and the University of Kansas, then 2009–present by the University of Kansas Paleontological Institute, is a definitive multi-authore ...
, Part L, Ammonoidea. R. C. Moore (ed). Geological Society of America and Univ of Kansas press, 1957
Haloritidae Paleobiology DB
Ceratitida families
Late Triassic first appearances
Late Triassic extinctions
Tropitaceae
{{Ceratitida-stub