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11 June 2020 Juvenile eucladid crinoid from the Middle Devonian of Turkey
William I. AUSICH, M. Cemal GÖNCÜOG LU
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Abstract

A microcrinoid-sized eucladid crinoid (Eucladida Wright, 2017) is described from the Yığınlı Formation (Devonian, Famennian) in the Büyük Zap Anticline in the Hakkari region of SE Turkey. Compared to other eucladids of similar size, the Yığınlı 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.

© Publications scientifiques du Muséum national d'Histoire naturelle, Paris.
William I. AUSICH and M. Cemal GÖNCÜOG LU "Juvenile eucladid crinoid from the Middle Devonian of Turkey," Geodiversitas 42(14), 215-221, (11 June 2020). https://doi.org/10.5252/geodiversitas2020v42a14
Received: 17 July 2019; Accepted: 18 September 2019; Published: 11 June 2020
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KEYWORDS
crinoid
Devonian
Famennian
Hakkari
Southeastern Turkey
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