S113

Stylochlamydium asteriscus Haeckel

Stylochlamydium asteriscus Haeckel, 1887, p. 514, pl. 41, fig. 10

DESCRIPTION "Circular disc with centre somewhat thickened. Concentric rings surround a central chamber separating shell into a system of 4 to 7 pored bands increasing in breadth toward shell margin. Pores are subcircular, approximately the same size and evenly spaced, 1-3 per ring. Marginal band is a thin, porous equatorial girdle. Characteristically, radial, needle-like spines (up to 10) extend from the centre to the perphery and beyond, subdividing the concentric bands into chambers. Central structure may be clearly visible or obscured by spongy lattice." (Gail Lombari, unpublished data).

DIMENSIONS "Based on 20 specimens; diameter of central shell 10-12 microns; diameter of shell with 5 bands 94-110 microns. Breadth of second band 5-7 microns, of third band 7-9 microns, of fourth band 9-12 microns, of fifth band 12-16 microns, of sixth band 15 microns (3 specimens) of seventh band 17 microns (1 specimen)." (Gail Lombari, unpublished data).

Plate 14, figure 5

S114

RECENT DISTRIBUTION

1. Molina-Cruz, 1975, Code S30. "This species presented three variants. Thus, it was divided into three categories: (1) S30, (2) S30A, and (3) S30B. S30 has an opaque center and is mostly abundant in the equatorial region. S30A has a clear and concentric center but it is in the form of a spiral. S30B was not common in this study. "

S30 and S30A used in factor analysis of southeast Pacific assemblages; S30B not used; cf. Appendix 10 for percent S30, S30A and S30B at each station."