Abstract

Two new taxa of groenlandaspidid fish (Placodermi: Arthrodira) from non-marine deposits of the Catskill Formation (Upper Devonian) at Red Hill, Clinton County, Pennsylvania, USA, are the first to be described from North America outside of Greenland. Groenlandaspis pennsylvanica n.sp. is known only from isolated trunk elements that are quite similar to Groenlandaspis antarctica Ritchie, 1975. Groenlandaspis pennsylvanica n.sp. is characterized by distinct features of the median dorsal (MD), posterior dorsolateral (PDL), and anterior dorsolateral (ADL) plates. Turrisaspis elektor n.gen. and n.sp. is a smaller form with a high median dorsal plate (MD) and tall, narrow elements of the dorsolateral trunk shield, particularly the PDL, giving this taxon a distinctively short, high trunk shield. The head shield of Turrisaspis elektor has a divided pineal plate and the postmarginal plate makes contact with the postorbital plate, excluding the marginal plate from the lateral margin of the head shield. Groenlandaspis pennsylvanica n.sp. is a rare faunal component at the Red Hill site whereas Turrisaspis elektor is very common. The large sample size of Turrisaspis elektor provides a glimpse at ontogenetic and individual variation within this taxon.

 
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Bibliographic Data

Short Form
Daeschler et al., 2003, Rec. Aust. Mus. 55(1): 45–60
Author
Edward B. Daeschler; Anna C. Frumes; C. Frederick Mullison
Year
2003
Title
Groenlandaspidid placoderm fishes from the Late Devonian of North America
Serial Title
Records of the Australian Museum
Volume
55
Issue
1
Start Page
45
End Page
60
DOI
10.3853/j.0067-1975.55.2003.1374
Language
English
Date Published
16 April 2003
Cover Date
16 April 2003
ISSN
0067-1975
CODEN
RAUMAJ
Publisher
The Australian Museum
Place Published
Sydney, Australia
Subjects
PALAEONTOLOGY; DEVONIAN: LATE; FISHES
Digitized
16 April 2003
Available Online
16 April 2003
Reference Number
1374
EndNote
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