Floripila formosa, Prokop & Slámová, 2012

Prokop, Rudolf J. & Slámová, Radana, 2012, New Species Of Crinoids Based On Their Columnals And Stem Fragments (Col.), From The Lower Devonian Zlíchov Limestone (Barrandian Area, The Czech Republic), Acta Musei Nationalis Pragae Series B 68 (3 - 4), pp. 133-138 : 134

Floripila formosa sp. n. (col.)

Pl. 1, figs 7-10, text-fig. 1

1987

Floripila formosa sp. n. (col.): Slámová MS; p. 76-77, pl. IX, figs 7-10, text-fig. 21.

H o l o t y p e: Isolated pluricolumnal NMP L 26642 figured by Slámová 1987, pl. IX, fig 10, text-fig. 21 and herein on Pl. 1, fig.8.

T y p e h o r i z o n: “ChapelHorizon”atthebaseofthe ZlíchovLimestone,LowerDevonian, Zlíchovian (=Lower Emsian).

T y p e l o c a l i t y: Abandoned quarry “U kapličky”, Praha-Zlíchov.

M a t e r i a l: In addition to the holotype and paratypes, 17 isolated columnals and 6 stem fragments from weathered biosparitic limestones exposed at the type locality. The species is also recorded from Praha-Lochkov, “Hvížďalka” Quarry.

D e s c r i p t i o n: Stem heteromorphic, broadly pentagonal in outline, noditaxis composed of relatively tall nodals (N) and two rows of internodals (1-2 IN). Latera vaulted, with five distinctive grooves running parallely with axial canal throughout the length of the stem. Nodals massive, five-lobed, its latera and epifacet densely granulated. Internodals pentagonal, 1 IN short, 2 IN extremely thin, epifacet narrow or missing. Articular facet flat, subpentagonal to broadly pentalobate, crenularium composed of straight, mid-fine crenelae (cca 60 culmins). Symplexy articulation. Areola broadly pentalobate, extended up to latera.

R e m a r k s: Floripila formosa sp. n. differs from the type-species in the complicated tips of its epifacet, in the columnal´s latera having a densely granulate surface and in the morphology of the articulum. Further more, it differs from Floripila florealis in the shape of the crenularium which does not reach the lumen.

Group: Cyclici MOORE et JEFFORDS, 1968

Figures

Text-fig. 1. Floripila formosa sp. n. (col.). A – nodal in facetal view. B – nodal with internodal in lateral view. C – cross section of nodal and internodal. Drawing by Radana Slámová.