Polypora triangularis Rogers 1900
Creators: name: Ernst, Andrej
name: Claussen, Anna Lene
name: Seuss, Barbara
name: Wyse Jackson, Patrick N.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Bryozoa
Stenolaemata
Fenestrida
Fenestellidae
Polypora
Polypora triangularis

description: Polypora triangularis Rogers, 1900
Figures 15 E-H, 16A-G; Appendix
1900 Polypora triangularis Rogers, p. 8-9, pl.
4, figs. 3-3c.
1929 Polypora aestacella Moore, p. 24-25, pl.
3, figs. 9, 10.
1929 Polypora sigillaria Moore, p. 121-122, pl.
15, figs. 12, 14.
Material. SNSB-BSPG 2020 XCI 24, SNSB-BSPG 2020 XCI 25, SNSB-BSPG 2020 XCI 26, SNSB-BSPG 2020 XCI 30, SNSB-BSPG 2020 XCI 48, SNSB-BSPG 2020 XCI 50, SNSB-BSPG 2020 XCI61, SNSB-BSPG 2020 XCI 72, SNSB-BSPG 2020 XCI 114, SNSB-BSPG 2020 XCI 115, SNSB-BSPG 2020 XCI 116, SNSB-BSPG 2020 XCI 117.
Exterior description. Reticulate colonies composed of moderately wide branches joined by moderately wide dissepiments. Autozooecia arranged in 5–7 alternating rows on branches. Autozooecial apertures rounded to oval, 7–10 spaced per length of fenestrule. Proximal pores at apertures developed, 0.025 –0.027 mm in diameter, often continued in the proximal slit (Figure 16 E-F). Fenestrules subrectangular to oval, longer than wider. Nodes on the reverse side of branches, 0.06–0.11 mm in diameter.
Interior description. Autozooecial chambers generally rhombic to roughly hexagonal in the mid-tangential section. Hemisepta absent. Extrazooidal skeleton well-developed, protruded by abundant microstylets. Microstylets 0.008 –0.015 mm in diameter, spaced densely. Circular to elliptical nodes irregularly arranged between autozooecial rows, 0.045 –0.115 mm in diameter. Apparent reproductive heterozooecia in the form of isolated zooecia with enlarged endozonal chambers present. Chambers rounded, 0.18–0.30 mm in diameter, covered by roofs with slightly depressed central parts. Skeletal material of roofs covered by abundant pustules. Nanozooecia present.
Remarks. Polypora sigillaria Moore, 1929, and P. aestacella Moore, 1929, are identical with P. triangularis Rogers, 1900. Their sizes are similar, and they both possess characteristic proximal pores at apertures. Polypora triangularis Rogers, 1900, differs from P. gzhelensis Schulga-Nesterenko, 1951, from the Pennsylvanian (Gzhelian) of the Russian Platform in having longer fenestrules (fenestrule length 2.30–3.25 mm vs. 1.30–1.45 mm in P. gzhelensis)
Polypora triangularis differs from P. vereyensis Schulga-Nesterenko, 1951, from the Pennsylvanian (Moscovian) of the Russian Platform in having narrower branches (branch width 0.54–1.03 mm vs. 0.95–1.05 mm in P. vereyensis) and in possessing longer fenestrules (fenestrule length 2.30– 3.25 mm vs. 1.12–1.75 mm in P. vereyensis).
Occurrence. Pennsylvanian (Virgilian); Kansas, USA. Upper Graham Formation, Pennsylvanian (Virgilian); Texas, USA. Graham Formation, Pennsylvanian (Virgilian); TXV-200 (“Spillway section at Lost Creek Lake”), Texas, USA.
description: Published as part of Ernst, Andrej, Claussen, Anna Lene, Seuss, Barbara & Wyse Jackson, Patrick N., 2022, Stenolaemate bryozoans from the Graham Formation, Pennsylvanian (Virgilian) at Lost Creek Lake, Texas, USA, pp. 1-56 in Palaeontologia Electronica (a 15) (a 15) 25 (2) on pages 27-30, DOI: 10.26879/1174, http://zenodo.org/record/11032471