Conochitina, Eisenack, 1931

Li, Yangui, Yan, Chunbo, Wang, Chuanshang, Maletz, Jörg, Liang, Yan, Yao, Huazhou, Wu, Haizhi, Chen, Weixiong, Cheng, Jingqing, Fang, Zichen & Wang, Xiaofeng, 2025, Chitinozoans from the Telychian (Llandovery, Silurian) Shenxuanyi Member, upper Ningqiang Formation of the northwestern Yangtze Platform, China, Swiss Journal of Palaeontology (20) 144 (1), pp. 1-33 : 19

Conochitina (?) sp. 1 ( Fig. 5G )

Material: One flattened and incomplete specimen.

Description: Te smooth chamber is short columnar and gradually transitions into the aperture. Flanks are slightly convex. Tere are no shoulder, flexure and neck. Te aperture is broken. Te basal region is folded, so that the basal scar cannot be observed. Te surface of the wall is smooth, without any ornaments observed here.

Measurements: Measured data based on one specimen.

Comparison and remarks: Te columnar chamber is consistent with the morphological features of Conochitina ( Eisenack, 1931) . Since the feature of basal mucron is unknown, it is assigned to Conochitina (?) sp. 1 tentatively. Bursachitina rectangularis ( Zaslavskaya, 1983) and Conochitina longa Zaslavskaya, 1983 were recorded in the Yangtze region by Geng et al. (1997). While, B. rectangularis differs from C. (?) sp. 1 by a membranous collarette at the aperture, and C. longa is narrower than C. (?) sp. 1.

Locality and stratigraphic horizon: Unit 9 ( lower Chejiaba Formation ) of Majia section, Guangyuan, North Sichuan Province .

Figures

Fig. 5 Llandovery chitinozoans from the Shenxuanyi Member.Scale bars represent 50 μm (except the scale bar of specimens B, F, J, R, S and T represent 10 μm). A, B Eisenackitina venusta Tsegelnjuk,1982 (A N83-6. B close-up of N47-7 showing the ornaments). C-F Eisenackitina zhangjiajieensis Geng et al., 1997 (C N87-2. C N90-12. E N97-7. F close-up of N97-7 showing the ornaments). G Conochitina (?) sp. 1 (G Ch3-1). H Belonechitina sp. 1 (H N3-5). I Belonechitina sp. 2 (I N103-1). J–M Sphaerochitina palestinaense Grahn et al., 2005 (J close-up of N62-14 showing the ornaments. K N9-15. L N70-6. M N62-14). N–T Angochitina bipedata Geng et al, 1997 (N N55-15. O N55-7. P N39-11. Q N19-4. R close-up of N19-4 showing the ornaments. S close-up of N55-7 showing the ornaments.T close-up of N94-6 showing the ornaments)