S67

Spongurus (?) sp.

Spongurus (?) sp. Petrushevskaya, 1967, p. 33, fig. 16, III; fig. 26, I; Ling et al., 1971, p. 711, pl. 1, fig. 6

DESCRIPTION

"Shells somewhat different from Spongurus pylomaticus often encountered in same samples. These shells ellipsoidal and not cylindrical. Spongy tissue far looser and spaces far larger; in optical section their spiral arrangement can be seen. Specimens with developed mantle and pylome could not be detected...

"Spongurus (?) sp. outwardly similar to early stages of S. pylomaticus and at first glance differs only by spindle shape of shell. However, these species are essentially different in the structure of the spongy tissue." (from Petrushevskaya, 1967).

"This ellipsoidal, spiral spongy shell has been reported from the Antarctic by PETRUSHEVSKAYA (1967). Although the generic diagnosis given by HAECKEL (1862) for Spongurus does not encompass such forms with a spiral structure, we believe it seems the best to be considered here within the present classification scheme." (from Ling et al., 1971).

DIMENSIONS "Length 110-130 microns, width 65-80 microns" (from Ling et al., 1971).

"Length, 107 +/- 7 microns; width, 68 +/- 3 microns; based on measurements of 11 specimens." (from Sachs, 1973).

Plate 8, figure 4

S68

RECENT DISTRIBUTION

1. Ling et al., 1971; "PETRUSHEVSKAYA (1967) indicated that the present form is rather common in the temperate as well as tropical region of the Antarctic. We have noticed its occurrence in the central and eastern North Pacific sediments. Thus with the present finding from the Bering Sea sediments, even though sparse, it can be concluded that the present species has wide geographic distribution."

2. Sachs, 1973, Code not assigned; counted together with Spongurus pylomaticus.

3. Lozano, 1974; cf. Spongurus pylomaticus.

4. Molina-Cruz, 1975, Code S1; "It is most abundant in coastal and cool waters"; used in factor analysis of southeast Pacific assemblages; cf. Appendix 10 for percent S1 at each station.