Polypora dendroides M’Coy, 1844

Ernst, Andrej, Wyse Jackson, Patrick N. & Aretz, Markus, 2015, Bryozoan fauna from the Mississippian (Visean) of Roque Redonde (Montagne Noire, southern France), Geodiversitas 37 (2), pp. 151-213 : 190

Polypora dendroides M’Coy, 1844

( Figs 25 G-I; 26A; Appendix)

Polypora dendroides M’Coy, 1844: 206 , pl. 29, fig. 9 (lower figure). — M’Coy in Sedgwick & M’Coy 1855: 115. — Hoernes 1886: 229, fig. 231. — Stuckenberg 1888: 35, pl. 4, figs 1-3; 1895: 159, pl. 22, fig. 14. — Nicholson & Lydekker 1889: fig. 471a-a’. — Nikiforova 1938: 145, pl. 33, figs 7-9. — Bassler 1953: G125, fig. 86, 7a, b. — Miller 1963: 167, pl. 23, figs 1-3. — Tavener-Smith 1973: 478, pl. 23, figs 1-7. — Bancroft 1987: 196. — Morozova & Lisitsyn 1996: 533, pl. 5, figs 2a-c. — Morozova 2001: 80, pl. 39, figs 1a, b. — Wyse Jackson et al. 2006: 762-765, pl. 7, figs 1-11, text-fig. 1p-r.

Polypora dendroides M’Coy in Griffith, 1842: 10, nomen nudem.

Polypora dendroidea M’Coy – Morozova 1981: 5.

MATERIAL. — SMF 21.916- SMF 21.920.

OCCURRENCE. — Carboniferous, Mississippian (Tournaisian-Visean); Roque Redonde (Montagne Noire, southern France); Counties Wexford and Fermanagh, Ireland,? Russia.

EXTERIOR DESCRIPTION

Reticulate colonies composed of moderately wide branches jointed by moderately wide dissepiments. Autozooecia arranged in 3-5 alternating rows on branches.Autozooecial apertures rounded to oval,7-10 spaced per length of fenestrule.Fenestrules oval,narrow.

INTERIOR DESCRIPTION

Autozooecial chambers moderately long, generally rhombic to roughly hexagonal in the mid tangential section. Hemisepta absent.External laminated skeleton well-developed, traversed by abundant small microacanthostyles.Heterozooecia not observed.

COMPARISON

Polypora dendroides M’Coy, 1844 differs from P. gracilis Prout, 1860 from the Mississippian of Illinois, USA, in wider branches (average branch width 0.75 mm vs 0.58 mm in P. gracilis ). Polypora dendroides differs from P.bukhtarmensis Nekhoroshev, 1956 from the Mississippian (Tournaisian-Visean) of Altai, in wider branches (branch width 0.56-1.00 mm vs 0.60-0.75 mm in P. bukhtarmensis ), as well as in spacing of 7-10 apertures per fenestrule length instead of 4-6 in P. bukhtarmensis .

Figures

FIG. 25. — A-E, Fabifenestella macrofenestrata n. sp., holotype SMF 21.915; A, mid-tangential section showing autozooecial chambers with hemisepta (arrow); B, tangential section showing autozooecial apertures and apertural nodes; C-E, tangential section showing apparent brooding structures (C, arrow). F, Ptilofenestella carrickensis Tavener-Smith, 1965, TCD.60346; G-I, Polypora dendroides M’Coy, 1844; G, H, mid-tangential section showing autozooecial chambers, SMF 21.920; I, branch transverse section, SMF 21.918. Scale bars: A, B, D, E, H, 0.2 mm; C, G, 0.5 mm; F, G, 2 mm.