Siderastrea adkinsi ( Wells, 1934 )

Baron-Szabo, Rosemarie C., 2008, Dendrophylliina, Caryophylliina, Fungiina, Microsolenina, and Stylinina, Zootaxa 1952, pp. 1-244 : 154-155

Siderastrea adkinsi ( Wells, 1934)

Pl. 13, figs 10a–11

v*1934 Synastrea adkinsi: Wells p. 87, pl. 3, figs 14, 15.

v 1960 Synastrea cf. adkinsi Wells : Berryhill, et al., p. 151.

2000 Synastrea adkinsi, Wells 1934 : Löser, p. 77.

2002 Synastrea adkinsi Wells : Mitchell, p. 6 ff., table 1.

v2002 Siderastrea cf. scottica Wells: Baron-Szabo, pl. 92, fig. 4.

v2003 Siderastrea adkinsi ( Wells, 1934) : Schafhauser et al., p. 190, tab. 1.

v2004 Siderastrea adkinsi ( Wells, 1934) : Baron-Szabo et al., p. R79.

v2006 Siderastrea adkinsi ( Wells, 1934) : Baron-Szabo et al., p. 16, fig. 4.7.

Dimensions. d=4.5–6.5 (8) mm; juvenile corallites may be smaller (2–3.5 mm); c-c= 5–10 mm, in areas of intense budding distance is around 3.5 mm; s=48, up to about 70; in juvenile corallites the number of septa may be 20–30; s/mm= 7–10/2; colony size: massive or encrusting= 5–25 cm in diameter; columnar or branching= up to 15 cm in length, with branches that are 5 cm in diameter.

Description. Massive, branching, domal, or encrusting, cerioid; calices diversely polygonal in outline; septa thin, subcompact or porous, subconfluent or nonconfluent, sometimes directly uniting with the neighboring polyp, arranged in 4 complete cycles in 6 systems, laterally covered with rounded granules, pennulae and?menianae; up to about 20 septa reach corallite center; columella spongy-papillose; wall synapticulothecal, incomplete; endothecal dissepiments thin, vesicular.

Remarks. In the original description of the type material Wells (1934, p. 87) gave a distance between corallite centers of 5 to 6.5 mm. He also reported that the septa were exclusively confluent and that the corallite walls and dissepiments were absent. However, re-examination of the type material showed that it differs from the original description by: 1) having a corallite wall, formed by synapticulae, 2) endothecal dissepiments, 3) mainly non- and subconfluent septa, and 4) a corallite distance of 4.5– 8 mm (3.5 juvenile). In regard to the first three itens, the assignment to the genus Siderastrea is suggested.

Because the specimen of S. adkinsi figured on Plate 13, fig. 11 is an upper surface view, its appearance slightly differs from the images of 10a and 10b, the latter of which show polished surfaces of a colony.

Type locality of species. Maastrichtian of Jamaica (Catadupa Midway) .

Distribution. Campanian-Maastrichtian (new material) of Jamaica, Maastrichtian of Mexico (Cardenas Formation), Danian of Argentina and Puerto Rico.

New Material. Maastrichtian of Jamaica, NMNH, Coates, coll., sample nos.: 311; 312; 325; 454; 454a; 454b; 454c; 454d; 457a; 458a; 459-I; 465-I; 466; 466a; 466b; 468a; 468b; 468c; 468e; 468g; 469; 469a; 469b;

469c; 469d; 469e; 469f-III; 470f; 470g; 474-II-2; 492d-II; 521 (=Ducketts Land Settlement); 380a; J-71-13p3; J-71-13r3; J-71-13s3; (=Vaughnsfield); 548a; J-71-42-17n (=Rio Minho); 570g-I; JAG 18.5a; JAG 18.5b

(=probably Cambridge railway area); J-71-17f-I; J-71-17i-I; J-71-18c (=Shaw Castle, Maldon Formation); J- 72-2h (=Marchmont Inlier); J3502d (=Point Flamstead).