Fistulipora tolokonnikovae, Ernst & Wyse Jackson & Aretz, 2015

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 : 155

Fistulipora tolokonnikovae n. sp.

( Fig. 5 A-E; Appendix)

ETYMOLOGY. — The species is named in honour of Zoya Tolokonnikova, who has contributed significantly to the study of Devonian and Carboniferous bryozoans.

HOLOTYPE. — SMF 23.110 .

PARATYPES. — SMF 23.111, TCD.60333, 60335, 60345.

TYPE LOCALITY. — Roque Redonde (Montagne Noire, southern France).

TYPE HORIZON. — Carboniferous, Mississippian (upper Visean).

DIAGNOSIS. — Thin to moderately thick encrusting colonies, partly multilayered; apertures large, with well developed lunaria; vesicles small to large, 9-17 surrounding each autozooecial aperture; maculae present, consisting of vesicular skeleton.

DESCRIPTION

Encrusting, partly multilayered colony, 2.34-2.73 mm thick. Separate sheets in multilayered colony 0.87-1.53 mm thick. Autozooecia growing from thin epitheca, bending in the early exozone to the colony surface. Basal diaphragms rare to common, straight, thin, 2-5 in each autozooecium, concentrated usually in proximal parts of autozooecia. Autozooecial apertures circular to oval. Lunaria well-developed, rounded; ends of lunaria not indenting autozooecia. Vesicles small to large, separating autozooecia in 1-2 rows, 9-17 surrounding each autozooecial aperture, with rounded to flat roofs, polygonal in tangential section. Autozooecial walls granular prismatic, 0.010 -0.015 mm thick. Maculae 1.25-1.63 mm in diameter, spaced 7.6-8.4 mm from centre to centre, consisting of vesicular skeleton.

COMPARISON

Fistulipora tolokonnikovae n. sp. is similar to Fistulipora djebaglinica Nikiforova, 1933 from the Mississippian of Turkestan, but differs from it in larger autozooecial apertures (aperture width 0.36-0.55 mm vs 0.25-0.28 mm in F. djebaglinica ). Fistulipora tolokonnikovae differs from F. monoseriata Schulga-Nesterenko, 1955 from the Lower Carboniferous of Russia in arrangement of vesicles in 1-2 rows between autozooecia instead of 1 row in the latter species.

Figures

FIG. 5. — A-E, Fistulipora tolokonnikovae n. sp.; A, Tangential section, holotype SMF 23.110; B-C, tangential section showing maculae, autozooecial apertures and vesicles, holotype SMF 23.110; D, tangential section showing autozooecial apertures and vesicles, paratype SMF 23.111; E, longitudinal section, paratype SMF 23.111. Scale bars: A, 5 mm; B, C, E, 2 mm; D, 1 mm.