J.Schiller (1925a: 21, fig. Ka, b)
Syracosphaera corrugis Okada & McIntyre (1977: 21–22, pl. 8, figs 3, 6)Syracosphaera elatensis Winter, in Winter et al. (1979: 207–208, pl. 13) Caneosphaera mollischii (J.Schiller) Gaarder, in Heimdal & Gaarder (1981: 44–46, pl. 3)See also Heimdal & Gaarder (1980) and Kleijne (1993).
BCs 2–4 μm; distal shield flange broad, variably ornamented, usually heavily ribbed, sometimes with teeth protruding into the central area. Central area an irregular ridge and/or ring formed by upward growth of laths. CFCs with a prominent spine, smaller and less calcified than BCs, with narrower flanges. A single AAC usually present, similar to the BCs but with a stubby spine. XCs large; flange ribbed on distal side, expanding clockwise into wing (directed apically) c. twice as wide as the rest of the flange.
Several morphotypes can be recognised by their ornamentation.
55º00'S 141º10'E. R. Van den Enden, AAD, unpub.
43º15.3106'S 147º28.5829'E, I. Thomas, AAD, unpub.
47ºS 151ºE, L. Harding, AAD, unpub.
65.0613ºS 142.2002ºE, L. Harding, AAD, unpub.
Family Syracosphaeraceae description: Diploid phase motile; coccosphere completely or largely covered in caneoliths; often showing dithecatism, with endothecal layer of caneoliths normally conservative in form, exothecal layer variable, delicate and rarely preserved; and/or modified polar coccoliths, often forming appendages. Haploid phase motile, with holococcoliths, typically dome-shaped forms.
Syracosphaera Lohmann (1902) description: Usually dithecate; exothecal coccoliths (XCs) highly variable; endothecal coccoliths are muroliths with 1, 2 or 3 flanges; the form with 2 flanges often placolith-like; often differentiated into BCs, CFCs and AACs.