Helicosphaerella elongata

Helicosphaera elongata Theodoridis 1984

Elongated, sub-rectangular helicolith having an asymmetrical blanket (Type II, Helicosphaerella recta type), truncated flange termination a conjunct inverse bar with slit-like pores at both sides.

Helicosphaerella elongata differs from Helicosphaerella obliqua (Bramlette & Wilcoxon,1967) Aubry, Liu, de Vargas, & Probert in Aubry & Bord (2009) and Helicosphaerella perch-nielseniae (Haq, 1971) Aubry, Liu, de Vargas, & Probert in Aubry & Bord (2009) by being narrowly elongated and sub-rectangular in shape

Bramlette, M. N., Wilcoxon, J. A., 1967. Middle Tertiary calcareous nannoplankton of the Cipero section, Trinidad, W.I. Tulane Studies in Geology and Paleontology 5, 93-131.

Haq, B. U., 1973. Evolutionary trends in the Cenozoic coccolithophore genus Helicopontosphaera. Micropaleontology 19(1), 32-52.

Jafar, S. A., Martini, E., 1975, On the validity of the calcareous nannoplankton genus Helicosphaera. Senckenbergiana Lethaea 56, 381-397.

Theodoridis, S., 1984. Calcareous nannofossil biostratigraphy of the Miocene and revision of the helicoliths and discoasters. Utrecht Micropaleontological Bulletin. 32, 1-271.