Stylophyllopsis veracolumella, Vasseur & Lathuilière, 2021

Vasseur, Raphaël & Lathuilière, Bernard, 2021, Pliensbachian corals from the Western Tethys, Geodiversitas 43 (22), pp. 1187-1291 : 1267

Stylophyllopsis veracolumella n. sp.

( Fig. 56 )

urn:lsid:zoobank.org:act:63B1ABD4-42E4-442F-80FD-4DE250ADF4B4

Stylophyllopsis sp. 2 – Vasseur 2018: 330-331, fig. 3.90.

TYPE MATERIAL. — Holotype MHNLM 2019.4.1 STUDIED SAMPLES. — 13 specimens: holotype MHNLM 2019.4.1, batch 1279 from private collections of Marc Chesnier (collection MC).

ETYMOLOGY. — The species name refers to the presence of a true papillose columella in the axis of the corallite.

TYPE HORIZON. — Pliensbachian. TYPE LOCALITY. — Brûlon (Sarthe; France). GEOGRAPHIC AND STRATIGRAPHIC RANGES. — Pliensbachian of Brûlon (Sarthe; France).

DESCRIPTION

Solitary, cylindroconical corallum. Radial elements are slightly exsert, straight, free or joined costosepta with stylophyllid structure that produce regular variations in width of septa from the periphery to the inner edge. The distal edge is festooned and the inner edge shows dissociated septal spines that project in the lumen and produce a well expressed papillose parietal columella. Radial symmetry. Endotheca dissepimental. No synapticulae. Wall of unknown nature. A wrinkled epicostal epitheca s.l. wraps the corallum.

Calicular diameter: 16 to 18 mm – Number of septa: approximately 62 – Septal density: 3 - 4 per 2 mm.

SIMILARITIES AND DIFFERENCES

This taxon differs from S. rugosa ( Duncan, 1868) , S. mucronata ( Duncan, 1868) and S. murchisoniae (Duncan, 1867) by the presence of a true papillose columella and from the other species of the genus by its morphometric characters.

Figures

FIG. 56. — Stylophyllopsis veracolumella n. sp.: A, proximal view of the holotype MHNLM 2019.4.1; B, distal view of the previous specimen; C, proximal view of one specimen from the batch MC 1279; D, distal view of the previous specimen; E, distal lateral view of one specimen from the batch MC 1279; F, detail in distal view of one specimen from the batch MC 1279. Scale bars: A, B, D, 5 mm; C, E, 1 mm F, 2 mm.