Healdianella cf. subdistincta Wang, 1983

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 : 33

Healdianella cf. subdistincta Wang, 1983

Fig. 8Q–R

Material examined

CHINA • 1 complete carapace ( Fig. 8Q ); Blue Snake section, Tangbagou Formation, sample 19BAI 02; P6M 3912 • 1 complete carapace ( Fig. 8R ); Blue Snake section, Tangbagou Formation, sample 19BAI 02; P6M 3913 • 8 complete carapaces; Blue Snake section, Tangbagou Formation, samples 19BAI 03, 19BAI 08, 19BAI 23. All from the Tournaisian, early Carboniferous.

Dimensions

RV: L = 359–697µm, H = 189–300µm, H/L = 0.42–0.52.

LV: L = 359–688µm, H = 200–291 µm, H/L = 0.42–0.56.

Remarks

This species is rare in the studied material. The specimens are morphologically close to Healdianella subdistincta Wang, 1983 from the Emsian, early Devonian of Guangxi, South China ( Wang 1983a) but they have a more elongated morphology, a straight DB with Hmax developed all along DB and a straight PDB with distinct AD angulation. Healdianella subdistincta is larger, with L ranging from 1440 to 1760 µm, H from 880 to 1000µm and H/L between 0.57 and 0.61, while it is between 0.47 and 0.56 here. Our material has a small size and may correspond to juveniles so that we only compare them to Healdianella subdistincta until more material is found to clarify this issue.

Occurrence

Samples 19BAI 02, 19BAI 03, 19BAI 08, 19BAI 23, Tangbagou Formation, Blue Snake section, Tournaisian, early Carboniferous (this work).

Figures

Fig. 8. SEM pictures and focus stacking method pictures (with an *) 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 (SU). A– B. Sulcella baisuzhena Guillam & Forel sp. nov. A. A-4, left lateral view of a carapace, sample 19BAI 68 (P6M 3996). B. A-5, left lateral view of a carapace, sample 19BAI 68 (P6M 3897). C. Bairdiocypris elliptica Wei, 1983, right lateral view of a carapace, sample 19BAI 08 (P6M 3898). D–E. Bairdiocypris fomikhaensis Buschmina, 1968. D. Left lateral view of a carapace*, sample 19BAI 41 (P6M 3899). E. Left lateral view of a carapace, sample 19BAI 44 (P6M 3900). F. Bairdiocypris marginifera (Geis, 1932) sensu Buschmina, 1968, left lateral view of a carapace, sample 19BAI 67 (P6M 3901). G. Bairdiocypris sp., left lateral view of a carapace, sample 19BAI 01 (P6M 3902). H–L. Cytherellina caerulea Guillam & Forel sp. nov. H. Holotype, right lateral view of a carapace, sample 19BAI 68 (P6M 3903). I. Paratype 1, right lateral view of a carapace, sample 19BAI 68 (P6M 3904). J. Paratype 2, right lateral view of a carapace, sample 19BAI 63 (P6M 3905). K. Right lateral view of a carapace, sample 19BAI 63 (P6M 3906). L. Right lateral view of a carapace, sample 19BAI 69 (P6M 3907). M. Healdianella alba Lethiers, 1981, right lateral view of a carapace, sample 19BAI 60 (P6M 3908). N. Healdianella faseolina Rozhdestvenskaya in Song & Gong, 2019, right lateral view of a carapace, sample 19BAI 43 (P6M 3909).O. Healdianella lumbiformis Lethiers & Feist, 1991, right lateral view of a carapace, sample 19BAI 58 (P6M 3910). P. Healdianella cf. insolita (Buschmina, 1977), right lateral view of a carapace, sample 19BAI 55 (P6M 3911). Q–R. Healdianella cf. subdistincta Wang, 1983. Q. right lateral view of a carapace, sample 19BAI 02 (P6M 3912). R. right lateral view of a carapace, sample 19BAI 03 (P6M 3913). S. Healdianella sp., right lateral view of a carapace, sample 19BAI 60 (P6M 3914). T. Praepilatina adamczaki Olempska, 1979, left lateral view of a carapace, sample 19BAI 68 (P6M 3915). U. Elliptocyprites lorangeri Lethiers, 1981, right lateral view of a carapace, sample 19BAI 60 (P6M 3916). Scale bars = 100 µm.