''Callavia'' is an
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
,
monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
of
trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...
arthropod
Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a Segmentation (biology), segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and Arth ...
s. ''C. broegeri'' lived during the late
Atdabanian
Cambrian Stage 3 is the still unnamed third stage of the Cambrian. It succeeds Cambrian Stage 2 and precedes Cambrian Stage 4, although neither its base nor top have been formally defined. The plan is for its lower boundary to correspond approxim ...
stage, which lasted from 530 to 524 million years ago during the early part of the
Cambrian Period
The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ...
in what are today Canada and the United States.
Taxonomy
The position of ''Callavia'' in relation to other Olenellina has shifted repeatedly over time. Initially it was assigned to the Holmiinae by
Pierre Hupé, and was later moved back and forth to the Callaviinae.
Lieberman, however, argues ''Callavia'' is a basal member of the Judomioidea.
[
]
Reassigned species
* ''C. brevioculata'' = '' Nevadella cartlandi''
* ''C. burri'' = '' Pleisionevadella burri''
* ''C. callavei'' = '' Callavalonia callavei''
* ''C. cartlandi'' = '' Nevadella cartlandi''
* ''C. cobboldi'' = '' Nevadella cartlandi''
* ''C. eucharis'' = ''Nevadella eucharis
''Nevadella'' is an extinct genus of trilobites, fossil marine arthropods, with species of average size (about long). It lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of the Cambrian ...
''
* ''C. hastata'' = '' Callavalonia callavei''
* ''C. lotzei'' = '' Sdzuyomia lotzei''
* ''C. perfecta'' = '' Nevadella perfecta''
Distribution
''C. broegeri'' is known from the Lower Cambrian of Newfoundland (Brigus Formation, Branchian Series, Conception Bay), Nova Scotia (between Docters Brook and Malignant Brook, northernmost Antigonish Highlands), Canada, and Massachusetts, USA ( Weymouth Formation, Pearl street, North Weymouth, Mill Cove, Norfolk County).
Ecology
''C. broegeri'' occurs together with lampshells ''Sunnaginia imbricata'' and ''Eccentrotheca kanesia'', and
the agnostid
Agnostidae is a family of Agnostida trilobites. Like all Agnostina, they were eyeless and bore only two thoracic segments. They ranged in benthic waters across the globe from 508 to 461 million years ago, containing the following genera, among o ...
''Serrodiscus bellimarginatus''.Paleobiology Database
/ref>
See also
*'' Nevadella''
References
{{Taxonbar, from=Q26183
Olenellina
Cambrian trilobites
Fossils of Canada
Fossils of the United States
Monotypic arthropod genera
Paleontology in Newfoundland and Labrador
Paleontology in Nova Scotia
Paleozoic life of Nova Scotia