Tibetiporella ornata, Ernst, 2016

Ernst, Andrej, 2016, Bryozoan fauna from the Permian (Artinskian-Kungurian) Zhongba Formation of southwestern Tibet, Palaeontologia Electronica (1946) 51 (9), pp. 1-59 : 50

Tibetiporella ornata n. gen. n. sp

Figures 21.6-8 , 22.1-9 ; Table 29

zoobank.org/ D85111C2-1B35-45F2-8278-80137807B6C5

Etymology. The species is named after rich ornamentation due to various styles on the obverse colony surface (after Latin " ornata " = adorned, decorated).

Holotype. SMF 23.227 .

Paratypes. SMF 23.209 – SMF 23.213 , SMF 23.224 – SMF 23.226 , SMF 23.228 , SMF 23.229 .

Type locality. Zhongba area of southwestern Tibet (E 84.31111, N 29.73889) .

Type stratum. Zhongba Formation, Permian (upper Cisuralian–Guadalupian).

Diagnosis. See genus diagnosis.

Exterior description. Reticulate colony formed by broad branches fused together; colony shape unknown. Autozooecia arranged in 3–7 rows on branches. Autozooecial apertures circular, 6–7 apertures spaced per fenestrule length. Large nodes on the obverse colony surface, 0.05–0.12 mm in diameter. Smaller styles irregularly arranged, 0.025 –0.030 mm in diameter. Reverse colony side smooth.

Interior description. Autozooecial chambers long, narrow, tubular, with long vestibules, proximally recumbent on budding plate, rhomboidal in mid-tangential section, long axis parallel with branch axis. Hemisepta and diaphragms absent. Extrazooecial skeleton thick, laminated, traversed by abundant, moderate-size microstyles 0.003 –0.006 mm in diameter. Apparent reproductive heteromorphs in the form of isolated zooecia with enlarged chambers in the proximal part of the vestibule, occurring on obverse colony surface. Chambers rounded, oval to semicircular in tangential section, 0.24–0.41 mm wide.

Remarks. See genus diagnosis and remarks.

Figures

FIGURE 21. Thin section photographs of Protoretepora irregularis n. sp., paratype SMF 23.201 (1, 3, and 4), paratype SMF 23.202 (2), and holotype SMF 23.195 (5); and Tibetiporella ornata n. gen. n. sp., paratype SMF 23.224 (6 and 7) and holotype SMF 23.227 (8). 1, tangential section showing autozooecial apertures and chambers; 2, mid-tangential section showing autozooecial chambers; 3, 4, 7, and 8, tangential section showing autozooecial apertures, microstyles and nodes; 5, tangential section of obverse colony side with nodes; and 6, tangential section of the reverse side of the colony.

FIGURE 22. Thin section photographs of Tibetiporella ornata n. gen. n. sp., holotype SMF 23.227 (1 and 2), paratype SMF 23.211 (3 and 4), paratype SMF 23.210 (5 and 6), paratype SMF 23.213 (7 and 8), and paratype SMF 23.225 (9). 1 and 2, tangential section showing autozooecial apertures, nodes and heteromorphs; 3 and 4, mid-tangential section showing autozooecial chambers; 5 and 6, tangential section showing autozooecial apertures, nodes and heteromorphs; 7 and 8, longitudinal section showing autozooecial chambers and heteromorphs; and 9, transverse section showing autozooecial chambers.