S1

Collosphaera tuberosa Haeckel

Collosphaera tuberosa Haeckel, 1887, p. 97; Nigrini, 1971, p. 445, pl. 34.1, fig. 1

DESCRIPTION "Shell is a smooth-surfaced, lumpy sphere, having numerous subcircular pores, irregular in size and distribution. Usually there is a rather larger pore where the shell indents." (from Nigrini, 1971)

DIMENSIONS "Maximum shell diameter 103-159mu." (from Nigrini, 1971).

REMARKS

1. For a more complete synonymy and stratigraphy significance of this species, see Nigrini, 1971 and Knoll and Johnson, 1975.

Plate 1, figure 1

S2

RECENT DISTRIBUTION

1. Nigrini, 1970, fig. 2; belongs to a tropical assemblage derived by recurrent group analysis of North Pacific samples, but the species does range as far north as 40degN in the western Pacific.

2. Molina-Cruz, 1975, Code S-ll; used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent Sll at each station.

3. Morley, 1977, fig. I-1; "This species loads highest in factor 4 (subtropical). At present it occurs most frequently in a very narrow latitudinal band between 20 and 28degN. This species was found in none of the 18,000 YBP samples probably because no samples with Radiolaria at 18,000 YBP were found in this narrow region."