Baculopora redondensis, 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 : 194

Baculopora redondensis n. sp.

( Figs 27 B-H; 28A, B; Appendix)

ETYMOLOGY. — The species name refers to the type locality Roque Redonde.

HOLOTYPE. — SMF 21.947 .

PARATYPES. — SMF 21.926- SMF 21.946, SMF 21.948- SMF 21.955, TCD.60333, 60335, 60350-60353.

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

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

DIAGNOSIS. — Straight dichotomous branches; autozooecia in 2 to 6 rows; autozooecial apertures with 4-11 variably sized nodes; reverse surface smooth with 10 to 15 longitudinal rows of microstylets.

DESCRIPTION

Colonies of straight dichotomous branches, with undulating lateral margins; lateral branches not observed; branches oval to flattened in transverse section, 0.63-0.98 mm wide, 0.5- 0.6 mm thick. Autozooecia arranged in 2 to 6 rows; apertures circular to longitudinally oval, surrounded by 4-11 variably sized nodes; apertural nodes 0.015 -0.035 mm in diameter; spaced 3 to 4 diameters apart; interapertural walls carry three wavy rows of microstyles; autozooecial chambers polygonal in mid-tangential section, generally hexagonal (diamond-shaped), relatively short and high; lined with thin laminar skeleton; terminal diaphragms occurring; reverse surface smooth with 10 to 15 longitudinal rows of microstylets; microstylets 0.005 - 0.010 mm in diameter.

COMPARISON

Baculopora redondensis n. sp. differs from B. megastoma ( M’Coy, 1844) in wider branches (0.63-0.98 mm vs 0.33-0.74 mm in B. megastoma ). Furthermore, Baculopora redondensis differs in wider spacing of autozooecial apertures (distances between aperture centres along branch 0.42-0.73 mm vs 0.33-0.53 mm in B. megastoma ).

Figures

FIG. 27. — A, Diploporaria tenella Wyse Jackson, 1988, tangential section showing autozooecial apertures, SMF 21.923; B-H. Baculopora redondensis n. sp.; B, tangential section of a dichotoming branch, paratype SMF 21.944; C, tangential section showing autozooecial apertures,holotype SMF 21.947; D, E, tangential section showing autozooecial apertures with nodes (arrow), paratype SMF 21.944; F, G, mid-tangential section showing autozooecial chambers, paratype SMF 21.930; H, branch longitudinal section, paratype SMF 21.939. Scale bars: A,C, H, 0.5 mm; B, 2 mm; D, E, G, 0.2 mm; F, 1 mm.