Kloedenellitina sincera Tschigova, 1960

Fig. 6A

Kloedenellitina sincera Tschigova, 1960: 223, pl. 8p figs 1–3.

Knoxiella cf. oblonga – Song & Gong 2019: fig. 4p–q.

Material examined

CHINA • 1 complete carapace (Fig. 6A); Blue Snake section, Gelaohe Formation, sample 19BAI 69; P6M 3856 • 19 complete carapaces; Blue Snake section, Gelaohe Formation, sample 19BAI 74. All from the Famennian, late Devonian.

Dimensions

RV: L = 360–864 µm, H = 206–455µm, H/L = 0.49–0.59.

LV: L = 360–842 µm, H = 196–435µm, H/L = 0.47–0.56.

Remarks

Knoxiella cf. oblonga Wang, 1978 in Song & Gong (2019) from the Famennian, late Devonian of Baihupo section, Guizhou, South China (Song & Gong 2019) does not belong to the genus Knoxiella Egorov, 1950 . The specimens shown in Song & Gong (2019: fig. 4p–q) has the typical Kloedenellitina

outline with AB and PB that are in the same plane. It is morphologically similar to Kloedenellitina sincera Tschigova, 1960 from our material and we consider that they are conspecific.

The adult carapace in our material is bigger than the holotype (L = 795 µm, H = 422 µm in Tschigova 1960) but the H/L ratio is similar (H/L = 0.53). The other specimens from our material are smaller and may represent juveniles of this species. The specimen shown in Song & Gong (2019: fig. 4p) is larger than our material and the holotype (L = 970 µm, H = 530 µm) but the H/L ratio is also similar (H/L = 0.55). The posterior part is inflated and shows a vertical sulcus opened ventrally which suggests that it may be a female (Ellis & Messina 1964). All our specimens are less inflated in the posterior part so they may correspond to males. The size variations clearly indicate that several stages are present in the assemblages studied but it is impossible to discriminate them.

Occurrence

Dankovo–Lebedyan Horizon, Russian platform, Famennian, late Devonian (Tschigova 1960). Blue Snake section, Guizhou, South China, Gelaohe and Tangbagou Formations, Famennian–Tournaisian, late Devonian–early Carboniferous (Song & Gong 2019). Samples 19BAI 69, 19BAI 74, Gelaohe Formation, Blue Snake section, Famennian, late Devonian (this work).