Sulcella baisuzhena Guillam & Forel, 2022

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 : 28-29

Sulcella baisuzhena Guillam & Forel sp. nov.

urn:lsid:zoobank.org:act:5E0110EC-49F8-4F34-BC57-C46B3232DAAA

Figs 7Q–U , 8A–B

Diagnosis

A species belonging to the genus Sulcella with elongate outline, VB concave, very long and slightly arched DB. Stragulum absent.

Etymology

The specific epithet refers to the latinization of the Chinese Bai Suzhen (also known as Baishe Niangniang which means White Snake Empress), which is a snake spirit in the Chinese “Legend of the white snake”.

Material examined

Holotype CHINA • 1 complete carapace ( Fig. 7Q ); Blue Snake section, Gelaohe Formation, sample 19BAI 74; Famennian, late Devonian; P6M 3991 .

Paratype CHINA • 1 complete carapace (A–1, Fig. 7R ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; Famennian, late Devonian; P6M 3892 .

Other material

CHINA • 1 complete carapace (A-1, Fig. 7S ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3993 • 1 complete carapace (A-2, Fig. 7T ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3894 • 1 complete carapace (A-3, Fig. 7U ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 8395 • 1 complete carapace (A-4, Fig. 8A ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3996 • 1 complete carapace (A-5, Fig. 8B ); Blue Snake section, Gelaohe Formation, sample 19BAI 68; P6M 3897 • 15 complete carapaces; Blue Snake section, Gelaohe Formation, samples 19BAI 67, 19BAI 68. All from the Famennian, late Devonian.

Dimensions

See Fig. 4C .

Description

Carapace of medium size, elongate with Hmax around to slightly anterior to the ⅓ rd of Lmax, at the junction between DB and ADB; Lmax at mid-H. RV larger than LV, overlapping it all around, sometimes absent or reduced at PVB and AB, stronger along dorsal margin and VB. Dorsal margin with a very long and straight to slightly arched DB, short PDB and uniformly convex ADB. VB concave; AB largely rounded with maximum around mid–H at both valves; PB weakly rounded, PVB slightly truncated. ACA about 155°, PCA close to 90°. Stragulum absent. Surface smooth.

Remarks

The present species is morphologically close to Sulcella kotchoensis Lethiers, 1981 from the Famennian of the Kotcho Formation, Imperial Island River 1, Western Canada ( Lethiers 1981) but it has a less stocky morphology, a less convex PVB, a more concave VB and Lmax located higher. Sulcella kotchoensis Lethiers, 1981 is also larger, with L ranging from 580 to 860 µm and H from 300 to 420 µm. The H/L scatter plot of Sulcella baisuzhena sp. nov. ( Fig. 4C ) allows to discriminate six ontogenetic stages (A-5 to Ad). The ontogenetic development of this species is marked by the elongation of outline and the VB becoming more concave.

Occurrence

Samples 19BAI 63, 19BAI 67, 19BAI 68, 19BAI 74, Gelaohe Formation, Blue Snake section, Famennian, late Devonian (this work).

Figures

Fig. 7. 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. Knoxites cf. argulata Zaspelova, 1959, left lateral view of a carapace, sample 19BAI 02 (P6M 3876). B. Paraparchites longmenshanensis Wei, 1983, right lateral view of a carapace, sample 19BAI 43 (P6M 3877). C. Paraparchites sp. 1, right lateral view of a carapace, sample 19BAI 39 (P6M 3878). D. Paraparchites sp. 2, right lateral view of a carapace, sample 19BAI 67 (P6M 3879). E. Shishaella hastierensis Crasquin-Soleau, 1988, right lateral view of a carapace, sample 19BAI 39 (P6M 3880). F. Shishaella porrecta (Zanina, 1956), left lateral view of a carapace, sample 19BAI 55 (P6M 3881). G–N. Sansabella gelaohensis Guillam & Forel sp. nov. G. Holotype, left lateral view of a carapace, sample 19BAI 74 (P6M 3882). H. Paratype 1, left lateral view of a carapace, sample 19BAI 74 (P6M 3883). I. Paratype 2, left lateral view of a carapace, sample 19BAI 74 (P6M 3884).J. A-1, left lateral view of a carapace, sample 19BAI 74 (P6M 3884). K. A-2, left lateral view of a carapace, sample 19BAI 74 (P6M 3885). L. A-3, left lateral view of a carapace, sample 19BAI 74 (P6M 3886). M. A-4, left lateral view of a carapace, sample 19BAI 63 (P6M 3887). N. A-5, left lateral view of a carapace, sample 19BAI 63 (P6M 3888). O. Cavellina cf. dushanensis Shi, 1964, left lateral view of a carapace, sample 19BAI 63 (P6M 3889). P. Cavellina cf. recta (Jones, Kirby & Brady, 1884), left lateral view of a carapace, sample 19BAI 67 (P6M 3890). Q–U. Sulcella baisuzhena Guillam & Forel sp. nov. Q. Holotype, left lateral view of a carapace, sample 19BAI 74 (P6M 3991). R. Paratype 1, A-1, left lateral view of a carapace, sample 19BAI 68 (P6M 3992). S. A-1, left lateral view of a carapace, sample 19BAI 68 (P6M 3893). T. A-2, left lateral view of a carapace, sample 19BAI 68 (P6M 3894). U. A-3, left lateral view of a carapace, sample 19BAI 68 (P6M 3895). Scale bars = 100µm.

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.

Fig. 4. H/L scatter plots of all specimens belonging to the four new species described in this contribution. A. Clavofabella? lanshella Guillam & Forel sp. nov. B. Sansabella gelaohensis Guillam & Forel sp. nov. C. Sulcella baisuzhena Guillam & Forel sp. nov. D. Cytherellina caerulea Guillam & Forel sp. nov.