Clavofabella? sp.

Guillam, Elvis, Forel, Marie-Béatrice, Song, Junjun & Crasquin, Sylvie, 2022, Late Devonian-early Carboniferous ostracods (Crustacea) from South China: taxonomy, diversity and implications, European Journal of Taxonomy 804, pp. 1-62 : 12-13

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).

Figures

Fig. 5. SEM pictures of ostracods from Blue Snake section, Dushan County, South China, late Famennian–Tournaisian, late Devonian–early Carboniferous. All specimens are temporarily housed in the collections of Sorbonne Université, Paris, France (numbers P6M****).A. Aparchites sp., left lateral view of a carapace, sample 19BAI 08 (P6M 3837). B. Fellerites sp. 1, right lateral view of a carapace, sample 19BAI 67 (P6M 3838). C. Fellerites sp. 2, right lateral view of a carapace, sample 19BAI 80 (P6M 3839). D. Parabolbinella sp., right lateral view of an anteriorly broken carapace, sample 19BAI 74 (P6M 3840). E. Amphissites sp., right lateral view of a steinkern, sample 19BAI 74 (P6M 3841). F–L. Clavofabella? lanshella Guillam & Forel sp. nov. F. Holotype, left lateral view of a carapace, sample 19BAI 68 (P6M 3842). G. Same specimen, dorsal view. H. Paratype, left lateral view of a carapace, sample 19BAI 68 (P6M 3843). I. A-1, left lateral view of a carapace, sample 19BAI 68 (P6M 3844). J. Same specimen, dorsal view. K. A-2, left lateral view of a carapace, sample 19BAI 68 (P6M 3845). L. A-3, left lateral view of a carapace, sample 19BAI 68 (P6M 3846). M–R. Clavofabella? sp. M. Adult, left lateral view of a carapace, sample 19BAI 68 (P6M 3847). N. A-1, left lateral view of a carapace, sample 19BAI 69 (P6M 3848). O. A-2, left lateral view of a carapace, sample 19BAI 68 (P6M 3849). P. A-3, left lateral view of a carapace, sample 19BAI 68 (P6M 3850). Q. A-4, left lateral view of a carapace, sample 19BAI 68 (P6M 3851). R. A-5, left lateral view of a carapace, sample 19BAI 68 (P6M 3852). S. Coryellina grammi Olempska, 1999, left lateral view of a carapace, sample 19BAI 41 (P6M 3853). T. Selebratina sp., left lateral view of a carapace, sample 19BAI 41 (P6M 3854). U. Beyrichiopsis sp., left lateral view of a carapace, sample 19BAI 41 (P6M 3855). Scale bars = 100 µm.