Turbinolia dickersoni Nomland, 1916

Baron-Szabo, Rosemarie C., 2008, Dendrophylliina, Caryophylliina, Fungiina, Microsolenina, and Stylinina, Zootaxa 1952, pp. 1-244 : 91-92

Turbinolia dickersoni Nomland, 1916

Text-Fig. 17

(v)*1916 Turbinolia dickersoni , n. sp.: Nomland, p. 61, pl. 3, figs 5–8.

(v)1944 Turbinolia midwayenesis Monsour , n. sp.: Monsour, p. 114, pl. 21, figs 4, 5.

(v)1944 Turbinolia tenuis Monsour , n. sp.: Monsour, p. 114, pl. 21, figs 7, 8.

v1945 Turbinolia barbadiana Wells , n. sp.: Wells, p. 13, pl. 3, figs 8–10.

v1945 Turbinolia barbadiana var. crassicostata Wells , n. var.: Wells, p. 14, pl. 3, fig. 11.

(v)1960 Turbinolia rosetta Howe , n.sp.: Howe, p. 1020, text-figs 1a, b.

1969 Turbinolia frescoenis n. sp.: Barta-Calmus, p. 818, pl. 1, figs 9, 9a.

1992 Turbinolia dickersoni Nomland, 1916 : Squires & Demetrion, p. 24, figs 45–46.

1997 Turbinolia rosetta Howe, 1960 : Cairns, p. 24.

1997 Turbinolia barbadensis Wells, 1945 : Cairns, p. 24.

1997 Turbinolia barbadiana var. crassicostata Wells, 1945 : Cairns, p. 24.

1997 Turbinolia dickersoni Nomland, 1916 : Cairns, p. 24.

1997 Turbinolia frescoenis Barta-Calmus, 1969 : Cairns, p. 24.

Dimensions. d=up to 3.75 mm; s=24; costae=24–48; h=2–10.5 mm.

Description. Trochoid corallum, Corallum elongate, slender, conical, straight; costosepta developed in 3 complete cycles in 6 systems; S1 and S2 strongly fused to columella; S3 unite with S1; 24 costae correspond to septa, in larger specimens additional 24 costae not representing septa present.

Remarks. In having 24 septa arranged in 3 cycles in 6 systems and a corallite diameter of up to 3.5 mm the species T. barbadiana corresponds very well with the taxon Turbinolia sulcata Lamarck from the Middle Eocene of France. However, no septa of the latter fuse with the columella or with each other as they do in T. dickersoni .

Type locality of species. Lower Eocene of the USA (California) .

Distribution. Paleocene of Ivory Coast and the USA (Alabama, Mississippi), Eocene of Mexico and the USA (Alabama, Louisiana, Mississippi, and Texas), Lower Eocene of Barbados (Upper Scotland Formation)

Text-Fig. 17 Turbinolia dickersoni Nomland, 1916 . A, B, as figured in Howe (1960, as holotype of Turbinolia rosetta Howe, 1960 ), Paleocene of the USA (Alabama), scale bar: 2.5 mm; A, longitudinal view; B, cross view.