Placostegus zbyslavus (ZIEGLER)
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publication ID |
https://doi.org/ 10.5281/zenodo.13191002 |
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persistent identifier |
https://treatment.plazi.org/id/03CCF03D-FFB8-1E4A-FAC3-680DFBE330F1 |
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treatment provided by |
Felipe |
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scientific name |
Placostegus zbyslavus (ZIEGLER) |
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Placostegus zbyslavus (ZIEGLER) View in CoL
Pl. 1, fig. 3
1984
Eoplacostegus zbyslavus n. sp. – Ziegler: p. 236, pl. 6, figs 1-2.
M a t e r i a l: One well preserved specimen. Two fragments of the erect free tube portion.
D e s c r i p t i o n: The free subtriangular tube portion is steeply erect and is twisted around its longitudinal axis. The tube diameter is 1.6 mm in the anterior tube portion and 1.5 and 1.9 mm in the middle part. Lumen circular. The posterior tube portion is coiled to form a planispiral 3.9 mm in diameter. The surface bears fine transversal furrows and three distinct longitudinal lines situated between three rounded longitudinal edges which give the tube a rounded triangular cross-section.
D i s c u s s i o n: Placostegus zbyslavus (ZIEGLER) belongs among the smaller species of the genus Placostegus . The specimens described by Ziegler (1984) do not bear transversal furrows in the posterior fixed tube portion. Placostegus dentatus (REGENHARDT) has a triangular cross-section, but lacks transversal ornamentation. Placostegus velimensis (JÄGER AND KOČÍ, 2007) is larger and has a rounded rectangular cross-section.
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