Ostracods

    Ostracods are small crustacea including both fossil and extant forms.  The typical ostracod is 1-3 mm in length, though smaller and larger forms are known.  As fossils, they are most notable for their calcareous carapace, which is composed of paired valves.  Both the paired valves and single valves can be recovered.  While the valves may be quite simple in some species, in others they may be elaborately decorated.  The following ostracods were recovered from weathered samples of the Darian Submember of the Wanakah Shale (Ludlowville Formation, Hamilton Group, Middle Devonian) at Bethany, NY.  The weathered material was washed seived, and the ostracods retrieved using a stereomicroscope.  All are 2 mm or less in length.

Ponderodictya punctulifera (Hall)
Pondero4a.jpg (4978 bytes)  Pondero3a.jpg (4701 bytes)

Euglyphella sp.
Euglyph2a.jpg (3813 bytes)   Euglyph3a.jpg (3592 bytes)  Euglyph1a.jpg (2844 bytes)

Quasillites sp.
Quasill1a.jpg (4007 bytes) 
Quasill2a.jpg (3191 bytes)

Hibbordia lacrimosa (Swartz & Quick)
Halliel2a.jpg (5167 bytes) 
Halliel4a.jpg (4393 bytes)

Ctenoloculina sp.
Ctenolo1a.jpg (4112 bytes) 

Welleria bisulcata Smith
unkwn1a.jpg (4348 bytes)

Phlyctiscapha subovata Smith ?
unkwn3ba.jpg (4737 bytes)

Poloneilla sp. ?
unkwn2ca.jpg (6551 bytes)


Reference
Smith, M.L. (1956) Some Ostracods from the Middle Devonian Ledyard and Wanakah Members of the Ludlowville Formation in Western New York.  J. of Paleontology 30 (1) 1-8.


Page last revised 17 May, 2000