Bairdioidea, Sars, 1888

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 : 37-39

Bairdioidea ? indet.

Fig. 11R

Material examined

CHINA • 1 complete carapace ( Fig. 11R ); Blue Snake section, Gelaohe Formation, sample 19BAI 63; P6M 3975 • 1 complete carapace; Blue Snake section, Gelaohe Formation, sample 19BAI 60. All from the Famennian, late Devonian.

Dimensions

RV: L = 375–419 µm, H = 228–237µm

LV: L = 388–432µm, H = 236–247 µm.

Remarks

This species is rare in the studied material. Its outline is typical of Podocopida and its lateral surface is characterized by 4 large nodes along the free margin and 3 other large nodes along the dorsal margin. This species is morphologically close to some ornamented Bairdiidae like the Triassic genus Nodobairdia Kollmann, 1963 which has large nodes in the dorsal part on the carapace but these forms of Bairdiidae are unknown from the Devonian and Carboniferous. Moreover, the overlap is reversed compared to most of genera among Bairdiidae , which is rare in this family. We cannot discuss further the systematic position of these specimens, even at family level, until more material will be available.

Occurrence

Samples 19BAI 60, 19BAI 63, Gelaohe Formation, Blue Snake section, Famennian, late Devonian (this work).

Figures

Fig. 11. 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 (SU). A. Bairdia sp. 4, right lateral view of a carapace, sample 19BAI 08 (P6M 3958). B. Bairdia sp. 5, right lateral view of a carapace, sample 19BAI 03 (P6M 3859). C. Bairdia sp. 6, right lateral view of a carapace, sample 19BAI 03 (P6M 3960). D. Bairdia sp. 7, right lateral view of a carapace, sample 19BAI 23 (P6M 3961). E. Bairdia (Cryptobairdia) cf. curta McCoy, 1844 emend. Jones & Kirkby, 1878 in Crasquin, 1986, right lateral view of a carapace, sample 19BAI 60 (P6M 3962). F. Bairdia (Cryptobairdia) lavenei Crasquin, 1985, right lateral view of a carapace, sample 19BAI 03 (P6M 3963). G. Bairdia (Rectobairdia) angulatiformis Posner, 1951, right lateral view of a carapace, sample 19BAI 67 (P6M 3964). H. Bairdia (Rectobairdia) buschminae Crasquin, 1985, right lateral view of a carapace, sample 19BAI 08 (P6M 3965). I. Bairdia (Rectobairdia) cf. plebeja Reuss, 1854, right lateral view of a carapace, sample 19BAI 03 (P6M 3966). J–L. Bairdia (Rectobairdia) sp. cf. R. sinuosa (Morey, 1936) in Crasquin, 1985. J. Right lateral view of a carapace, sample 19BAI 01 (P6M 3967). K. Right lateral view of a carapace, sample 19BAI 02 (P6M 3968). L. Right lateral view of a carapace, sample 19BAI 60 (P6M 3969). M. Bairdiacypris nanbiancunensis Wang, 1988, right lateral view of a carapace, sample 19BAI 60 (P6M 3970). N. Bairdiacypris quasielongata Buschimna, 1968, right lateral view of a carapace, sample 19BAI 01 (P6M 3971). O. Bairdiacypris subcylindrica Buschimna, 1984, right lateral view of a carapace, sample 19BAI 58 (P6M 3972). P. Bairdianella cuspis Buschmina, 1970, right lateral view of a carapace, sample 19BAI 03 (P6M 3973). Q. Fabalicypris sundarijanata Wang & Cao, 1997 in Song & Gong, 2019, right lateral view of a carapace, sample 19BAI 67 (P6M 3974). R. Bairdiodea? indet. Left lateral view of a carapace, sample 19BAI 63 (P6M 3975). Scale bars = 100µm.