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1 record found in the Index Nominum Genericorum database.

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Haplocalamus Unger in Richter et Unger, Denkschr. Kaiserl. Akad. Wiss., Math.-Naturwiss. Kl. 11(1): 155. t. 1, f. 1-3; t. 4, f. 12. 1856.
T.: H. thuringiacus Unger
Stem, calamitean affinities?; Upper Devonian; Saalfeld, Thuringia.
FOSSIL-SPHENOPSIDA (81) 9 Feb 1996

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