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Cheilotrypa strunica Tolokonnikova, Song & Zong, 2025, sp. nov.

Year: 2025
Type: other
Abstract: Cheilotrypa strunica sp. nov. (Fig. 3E–G, Table 2) Holotype. CNIGR museum № 1/13031; Bulongguoer section, upper member of the Hongguleleng Formation, Devonian (uppermost Famennian); Xinjiang, China. Additional material. CNIGR museum № 2/13031, 3/13031, 4/13031, 5/13031, 6/13031, 7/13031, 8/13031, 9/13031, 10/13031, 11/13031; same details as for the holotype. Etymology. The species name refers to the Strunian age of the deposits, in which bryozoans were found. Diagnosis. Colony delicately branched with a hollow axis, which has sinuous shape. Six rows of autozooecia are arranged around the axial hollow. Single autozooecial diaphragms in exozone. Autozooecial apertures oval with proximal overhangs. Rare vesicles. Description. Colony delicately branched with a hollow axis, which has a sinuous shape. Six rows of autozooecia are arranged around the axial hollow. Autozooecial walls 0.01 mm thick in endozones and thickened to 0.04–0.06 mm in exozone. Single autozooecial diaphragms present in exozones. Autozooecial apertures oval with proximal overhangs (Fig. 3E, G). Rare small vesicles in exozones, polygonal in deep tangential section, incompletely isolating autozooecia. Colony surface between apertures covered with thick layer of calcitic material, 0.06–0.10 mm in thickness. Lunaria usually poorly developed, 0.04–0.06 mm in length and 0.08–0.10 mm in width. Remarks. Cheilotrypa strunica sp. nov. differs from C. kurganica Tolokonnikova, 2012 from the Uppermost Famennian of Kurgan area, Russia, in the lower number of rows of autozooecia surrounding the axial hollow (6 vs 7–8 in C. kurganica), and in having smaller vesicles (0.06–0.08 mm vs 0.10–0.12 mm in C. kurganica).Additionally, the presence of proximal overhangs beneath the autozooecial apertures is unique to this species, further setting it apart from other members of the genus Cheilotrypa. Stratigraphical and geographical distribution. Upper member of the Hongguleleng Formation, Devonian (uppermost Famennian); Xinjiang, China.
DOI: 10.5281/zenodo.14954431
Institutions: Kuban State University, Kazan Federal University, Chinese Academy of Sciences, Nanjing Institute of Geology and Paleontology, University of Chinese Academy of Sciences, China University of Geosciences, State Key Laboratory of Biogeology and Environmental Geology
Language: English
Subfield: Paleontology
Open Access status: green
OpenAlex ID: W6893229117
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