The Haloritidae is a family of subglobular, involute, Triassic
ammonoids
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...
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
The Haloritidae is a family of subglobular, involute, ...
. 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 presentl ...
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
The Triassic ( ) is a geologic period and system (stratigraphy), system which ...
'', the type, ''
Amarassites
''Amarassites'' is an extinct genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above spec ...
'', ''
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, 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