Juvenile eucladid crinoid from the Middle Devonian of Turkey

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2020-06-01

Author

Ausich, William
Göncüoğlu, Mehmet Cemal

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A microcrinoid-sized eucladid crinoid (Eucladida Wright, 2017) is described from the Yiginli Formation (Devonian, Famennian) in the Buyuk Zap Anticline in the Hakkari region of SE Turkey. Compared to other eucladids of similar size, the Yiginli Formation specimen is at a quite advanced morphological stage with arms present through at least the secundibrachials. Early post-larval development is a key for understanding homologies among crinoid clades; however Paleozoic crinoids in the microcrinoid range (<= 2.0 mm) are very rare. This specimen is either at a very advanced developmental stage for its size, or typical microcrinoids are neotenic.

Subject Keywords

Crinoid, Crinoid, Devonian, Famennian, Hakkari, Southeastern Turkey

URI

https://hdl.handle.net/11511/30350

Journal

GEODIVERSITAS

DOI

https://doi.org/10.5252/geodiversitas2020v42a14

Collections

Graduate School of Natural and Applied Sciences, Article

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Citation Formats

W. Ausich and M. C. Göncüoğlu, “Juvenile eucladid crinoid from the Middle Devonian of Turkey,” GEODIVERSITAS, pp. 215–221, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30350.