Velatomorpha, a new healdioidean ostracode genus from the Early Pennsylvanian Joggins Formation, Nova Scotia, Canada

Internal features of the smooth, traditionally nonmarine ostracode "Carbonita" altilis (Jones and Kirkby 1879) are reported in detail for the first time. Based on the 26-28 stigmata within the adductor muscle scar (AMS) field, a ridge and groove contact margin, and an adont hinge, we estab...

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Bibliographic Details
Published in:Micropaleontology 2006-01, Vol.52 (1), p.51-66
Main Authors: Tibert, Neil E, Dewey, Christopher P
Format: Article
Language:English
Subjects:
Arthropoda
Canada
Carboniferous
Carbonita alitis
Carbonitidae
Coal
Crustacea
Cumberland County Nova Scotia
Eastern Canada
Edge effects
estuarine environment
Exoskeletons
Genera
Geology
Invertebrata
invertebrate
Joggins Formation
Joggins Nova Scotia
Lectotypes
Lower Pennsylvanian
Mandibulata
Maritime Provinces
microfossils
Micropaleontology
morphology
new names
new taxa
Nova Scotia
Ostracoda
Paleoecology
paleoenvironment
Paleontology
Paleozoic
Pennsylvanian
Podocopida
Scars
Systematics
Taxa
taxonomy
Velatomorpha
Velatomorpha alitis
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Description
Summary:Internal features of the smooth, traditionally nonmarine ostracode "Carbonita" altilis (Jones and Kirkby 1879) are reported in detail for the first time. Based on the 26-28 stigmata within the adductor muscle scar (AMS) field, a ridge and groove contact margin, and an adont hinge, we establish the new genus Velatomorpha. Included within this genus are taxa previously assigned to Carbonita, Healdia?, and Microcheilinella. The characters diagnosed for this new genus warrant placement in the Suborder Metacopina, Superfamily Healdioidea. The associated biota and sedimentary fades indicate that Velatomorpha lived in a mixed freshwater-marine (brackish) estuarine environment. The implication of our taxonomic revision for Velatomorpha altilis underscores the necessity to carefully evaluate the internal features of smooth, podocopid and metacopine ostracodes reported from Paleozoic strata before making taxonomic assignments and generalized paleoecological inferences.
ISSN:0026-2803
1937-2795
DOI:10.2113/gsmicropal.52.1.51