S13

Polysolenia flammabunda (Haeckel)

Choenicosphaera flammabunda Haeckel, 1887, p. 103, pl. 8, fig. 5

Acrosphaera flammabunda (Haeckel), Popofsky, 1917, p. 253, text-figs. 14-16 (partim.)

Polysolenia flammabunda (Haeckel), Nigrini, 1967, p. 15, pl. 1, fig. 2

DESCRIPTION "Similar to but with larger pores having a corona of up to 5 flat or conical spines. Single spines are also present on the margins of smaller pores, or may arise from pore clusters, or from between pores. Spines are narrower basally and generally longer than those of P. spinosa." (from Nigrini, 1967).

DIMENSIONS " Diameter of shell 81-136 mu ." (from Nigrini, 1967).

Sachs (1973) considered several species of Polysolenia together and found the diameter of Northern forms to be 153 +/- 9 mu and of Southern forms 123 +/- 2 mu, based on measurements of 3 Northern and 12 Southern specimens. It seems likely that his Northern specimens were P. arktios.

Plate 2, figure 2

S14

RECENT DISTRIBUTION

1. Nigrini, 1967, fig. 3; "Indian Ocean occurrences - P. flammabunda never constitutes more than 3 percent of the described population. In low latitudes it usually forms about 1 percent and in middle latitudes it is practically absent."

2. Sachs, 1973, Code 21S; combined several species of Polysolenia in his counts, " Quite rare (less than 2% everywhere), but most abundant, although still patchy, in Southern portion of study area." Southern is south of about 45deg N.

3. Molina-Cruz, 1975, Code S13A; not used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent S13A at each station.

4. Morley, 1977 (Polysolenia spp.) Fig. I-5; counted together with P. lappacea; "P. flammabunda is by far the less frequently occurring of these two species. These species load highest in factor 4 (subtropical). At present they are most abundant in the subtropical region between 20 and 31deg S and are absent south of 35deg S. Their very rare occurrence in the 18,000 YBP samples indicates a probable contraction in their distribution and a reduction in their abundance."