Late Devonian-early Carboniferous ostracods (Crustacea) from South China: taxonomy, diversity and implications

• Main Authors: Guillam, Elvis, Forel, Marie-Béatrice, Song, Junjun, Crasquin, Sylvie
• Format: Text
• Language: unknown
• Published: Zenodo 2022
• Subjects: Biodiversity; Taxonomy; Vestnik; Pechora
• Online Access: https://dx.doi.org/10.5281/zenodo.6363210; https://zenodo.org/record/6363210

Clavofabella ? sp. Fig. 5M–R Material examined CHINA • 1 complete carapace (Ad, Fig. 5M); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3847 • 1 complete carapace (A-1, Fig. 5N); Blue Snake section, Gelaohe Formation, sample 19BAI 69; P6M 3848 • 1 complete carapace (A-2, Fig. 5O); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3849 • 1 complete carapace (A-3, Fig. 5P); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3850 • 1 complete carapace (A-4, Fig. 5Q); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3851 • 1 complete carapace (A-5, Fig. 5R); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3852 • 10 complete carapaces; Blue Snake section, Gelaohe Formation, sample 19BAI 68. All from the Famennian, late Devonian. Dimensions RV: L = 204–805µm, H = 139–554µm, H/L = 0.68–0.74. LV: L = 202–805µm, H = 136–546µm, H/L = 0.65–0.73. Remarks Our material is morphologically close to non-dolonate specimens of Clavofabella multidentata Martinsson, 1955 from the Late Wenlock, Silurian of Mulde, Parish Fröjel, Gotland, Sweden (Martinsson 1955) but differs by its more rounded cardinal angles, deeper sulcus and larger adductorial pit. It is also close to Libumella ? sp. from the Famennian, late Devonian of the Yjid-Kamenka River section, Pechora Uplift, Russia (Sobolev 2020) but our material differs from this species by its more laterally compressed free margin, its deeper sulcal pit and its more developed lobation. This species may be new to science but the 16 specimens discovered are not sufficient to establish its generic attribution and to reasonably describe its diagnostic characters. Six different ontogenetic stages are present in our material (from A-5 to Ad). The ontogenetic changes through development cannot be precisely observed because of preservation but it seems that the outline does not show major changes, the sulcus apparently becomes deeper and the anterior lobe more developed. Occurrence Samples 19BAI 68, 19BAI 69, Gelaohe Formation, Blue Snake section, Famennian, late Devonian (this work). : Published as part of Guillam, Elvis, Forel, Marie-Béatrice, Song, Junjun & Crasquin, Sylvie, 2022, Late Devonian-early Carboniferous ostracods (Crustacea) from South China: taxonomy, diversity and implications, pp. 1-62 in European Journal of Taxonomy 804 on pages 12-13, DOI: 10.5852/ejt.2022.804.1689, http://zenodo.org/record/6359315 : {"references": ["Martinsson A. 1955. Studies on the ostracode family Primitiopsidae. Bulletin of the Geological Institution of Uppsala 36 (1): 1 - 31.", "Sobolev D. B. 2020. Ostracodes from the Devonian-Carboniferous boundary deposits on the reference section Yjid-Kamenka river (Pechora Uplift). Vestnik of Geosciences, 12 (312): 4 - 25. https: // doi. org / 10.19110 / geov. 2020.12.1"]}