N19

Phormospyris stabilis (Goll) scaphipes (Haeckel)

Tristylospyris scaphipes Haeckel, 1887, p. 1033, pl. 84, fig. 13

Tholospyris scaphipes (Haeckel), Goll, 1969, p. 328, pl. 58, figs. 1-6 (in part); Goll, 1972, p. 969, pl. 82, figs. 1-4, pl. 83, fig. 1

Tristylospyris scaphipes Haeckel, Benson, 1966, p. 316, pl. 22, figs. 7, 9-10

Ceratospyris angulata (Popofsky), Petrushevskaya, 1971, pl. 127, figs. 13-14, 16.

Acanthodesmiidae, gen. et spp. indet. Kling, 1973, pl. 8, fig. 23.

DESCRIPTION AND DIMENSIONS

"Sagittal ring subcircular; 37 to 76 microns high; 25 to 50 microns thick; joined to front, apex, and back of lattice shell. Apical spine short; vertical spine very short; frontal spine long; no axial spine. Primary-lateral bars joined to basal ring; no other connector bars.

"Basal ring oval; indented laterally and sagitally; 31 to 58 microns wide; 23 to 40 microns thick; joined directly to front and back of sagittal ring; encloses four basal pores. Three equal basal spines, 20 to 46 microns long, project downward from basal ring and taper to simple joint; one of them is frontal spine; two of them are adjacent to primary-lateral bars. In some skeletons, basal spines circular in cross section. Other specimens have basal spines that are tribladed or cruciform in cross section; frontal spine tribladed, having two parallel blades tangent to basal ring and third perpendicular blade projecting inward; basal spines adjacent to primary-lateral bars are cruciform, having two parallel blades tangent to basal ring and two blades parallel to primary-lateral bar. Most specimens possessing bladed basal spines have narrow median rib on outer surface of back of basal ring between primary-lateral bars. Lattice shell smooth; 58 to 89 microns thick; strongly constricted sagittally; has appearance of thin sheet perforated by circular, widely spaced lattice pores 1 to 23 microns in diameter. In some specimens, lattice shell extends below basal ring, is completely closed basally, and is joined to proximal portions of basal spines; in other skeletons, lattice shell ends at basal ring. Variable number of lattice bars joined to basal ring or sagittal ring. Four to nine pairs of sagittal-lattice pores. No vertical, sternal, or frontal pores." (from Goll, 1969).

"The emended description presented by Goll (1969) is correct in all aspects except one. It is necessary further to restrict the name scaphipes only to specimens bearing a well-developed ridge on the outer margin of the back of the basal ring. Thus defined, the specimen illustrated by Goll (1969, pl. 58, figs. 7-8, 13-14) is clearly not a member of this subspecies... Phormospyris stabilis scaphipes shares the general structural configuration of a deeply constricted, simple lattice shell and three basal lattice spines with numerous other trissocyclid morphs, many of which are unnamed, but it is readily distingiushed by its small size, thin, finely perforated lattice shell, and triblade on the back of the basal ring." (from Goll, 1977).

Plate 20, figures 2a-d

N20 REMARKS

1. For a more complete synonymy and additional illustrations see Goll, 1969.

RECENT DISTRIBUTION

1. Goll and Bjorklund, 1971 (Tholospyris scaphipes), text-fig. 6; "In the Atlantic Ocean other Radiolaria are restricted to the southern equatorial regions. Tholospyris scaphipes (Haeckel) Goll, 1969, has a distribution similar to but more restricted than the equatorial occurrences of Ceratospyris hyperborea (text-figure 7). Tholospyris scaphipes is also abundant north of the Antarctic Convergence and is absent north of latitude 15 degrees N. Anthocyrtidium ophirense (Ehrenberg) Nigrini, 1967, has a surface sediment distribution similar to that of T. scaphipes in our samples."

2. Goll, 1977; "Phormospyris stabilis scaphipes is scarce to common in sediments underlying the transition provinces and eastern equatorial provinces of the Pacific and southern Atlantic Oceans. In addition, the subspecies is present in low frequencies in biosiliceous sediments of the subtropical and equatorial Indian Ocean.