Tabulipora xinjiangensis Yang and Lu, 1983

Ernst, Andrej, 2016, Bryozoan fauna from the Permian (Artinskian-Kungurian) Zhongba Formation of southwestern Tibet, Palaeontologia Electronica (1946) 51 (9), pp. 1-59 : 23

Tabulipora xinjiangensis Yang and Lu, 1983

Figure 11.1-2 ; Table 12

1983 Tabulipora xinjiangensis Yang and Lu , p. 271, pl. 2, figs. 1-2.

Material. SMF 23.232– SMF 23.234.

Material. Encrusting colony, 0.75–1.26 mm thick. Autozooecia prismatic, having polygonal shape in transverse section, containing rare diaphragms and abundant ring septa. Ring septa concentrated in exozones, occupying about a half of the autozooecial chamber space. Acanthostyles 0.05–0.11 mm in diameter, having narrow hyaline cores and wide laminated sheaths, 1–3 surrounding each autozooecial aperture. Exilazooecia not observed. Endozonal walls granular, 0.015 –0.020 mm thick; exozonal walls monilae-shaped thickened, laminated, serrated, with distinct autozooecial boundaries, 0.075 –0.120 mm thick. Tubules abundant in exozonal walls, 0.010 –0.015 mm in diameter.

Remarks. Tabulipora xinjiangensis Yang and Lu, 1983 differs from T. angjiensis Xia, 1986 from the Ghainaha Formation (Middle Permian) of the Rutog region of Tibet, in possessing fewer acanthostyles and having larger autozooecial apertures (0.25–0.35 mm vs. 0.15–0.25 mm in T. angjiensis ). Tabulipora xinjiangensis differs from T. sinensis Yang and Lu, 1984 and T. wangcangensis Yang and Lu, 1984 from the Lower Permian of southwest China in having an encrusting colony instead of a branched colony.

Occurrence. Baliqliq Group, Lower Permian ; Kalpin, Western Xinjiang, China . Zhongba Formation, Permian ( upper Cisuralian –Guadalupian); Zhongba area of southwestern Tibet .

Figures

FIGURE 11. Thin section photographs of Tabulipora xinjiangensis Yang and Lu, 1983, SMF 23.233 (1 and 2); Dyscritella lii n. sp., holotype SMF 23.235 (3, 4, and 6) and paratype SMF 23.236 (5); and Ulrichotrypella omanica Ernst et al., 2008, SMF 23.242 (7 and 8). 1, longitudinal section showing ring septa; 2, oblique section showing macroacanthostyles and tubules; 3 and 4, oblique section through the colony; 5 and 6, tangential section showing autozooecial apertures and acanthostyles; and 7 and 8, oblique section.