S41

Cenosphaera cristata Haeckel?

Cenosphaera cristata Haeckel, 1887, p. 66; Riedel, 1958, p. 223, pl. 1, figs. 1, 2

DESCRIPTION "Spherical shell thick-walled, thorny. Pores subcircular or circular, variable in size, 10-24 on the half-equator, as wide to five times as wide as the intervening bars. Pores surrounded by raised polygonal frames bearing short thorns at the corners - in rare specimens the polygonal frames are absent but the thorns present... a large number of species of Cenosphaera have been described, in many instances inadequately, from both high and low latitudes, and the pattern of distribution of members of this group cannot be determined until the relationships between the various species are more satisfactorily understood." (from Riedel, 1958).

See also Petrushevskaya (1967) for further discussion of specific variability.

DIMENSIONS "Diameter of shell 115-230mu" (from Riedel, 1958).

REMARKS

1. For a more complete synonymy see Petrushevskaya (1975).

Plate 4, figures 2a, b

S42

RECENT DISTRIBUTION

1. Molina-Cruz, 1975,Code S5 ; not used in factor analysis of southeast Pacific assemblages, cf. Appendix 10 for percent S5 at each station.

2. Robertson, 1975; "This species loads most heavily in factor 3 (transitional). At the present this species is most abundant in a band between about 40deg and 45degN. It is absent in the extreme northern and southern portions of the study area. At 18,000 YBP it is absent north of about 43degN and is restricted to a narrow band centered at 40degN except for two samples to the west."