Callavia

Callavia is an extinct, monotypic genus of trilobite arthropods. C. broegeri lived during the late Atdabanian stage, which lasted from 530 to 524 million years ago during the early part of the Cambrian Period^[3] in what are today Canada and the United States.

Callavia Temporal range: Atdabanian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Callavia
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Suborder:	Olenellina
Superfamily:	Judomioidea[1][2]
Genus:	Callavia Matthew, 1897
Species:	C. broegeri
Binomial name
Callavia broegeri (Walcott, 1890)
Synonyms
Callavia crosbyi Nevadia crosbyi Olenellus (Holmia) broegeri Olenellus (Mesonacis) broegeri

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.^[4] Lieberman, however, argues Callavia is a basal member of the Judomioidea.^[2]

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
• 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 Serrodiscus bellimarginatus.^[5][6]

See also

• Nevadella