Velonalithus emelinesalleyae

Varol, 2025 Sep 06, 2020

Set number: 1658

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10µm

DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 252

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10µm

Velonalithus emelinesalleyae, Middle Miocene, DSDP Leg 25, Site 242, Mozambique Channel (Davie Ridge), Indian Ocean

Set number: 1659

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10µm

ODP Leg 154, Site 925C, Ceara Rise, Equatorial Atlantic Ocean

Set number: 782

Fig. 1 size=11.0µm/9.2µm; Fig. 2 size 16.7µm; Fig. 3 size=14.0µm; Fig. 4 size=18.4µm; Fig. 5 size=13.5µm; Fig. 6 size=15.4µm; Fig. 8 size=12.2µm; Fig. 8 size=13.0µm; Fig. 9 size=15.8µm; Fig. 10 size=16.7µm

Velonalithus emelinesalleyae, Middle Miocene, Malta

Final Epithet

Velonalithus emelinesalleyae Varol, 2025

Basionym

Velonalithus emelinesalleyae Varol, 2025

Synonyms

1998 Triquetrorhabdulus rioi Olafsson, 1989 – Young in Bown, Pl. 8.9, Figs. 17, 20; non-Pl. 8.9, Figs. 18-19

Diagnosis

Velonalithus emelinesalleyae features three blades with pointed ends at equal angles. Velonalithus emelinesalleyae exhibits strong birefringence in its natural settling profile, displaying white to yellowish-white interference colours. Notably, it demonstrates parallel extinction (with an extinction angle of 0°, Plate 6, Figs. 2, 6 in Varol, 2025) and length-slow (+) elongation in its natural position (Figure 17B and Plate 6, Fig. 7 in Varol, 2025).

Etymology

In honour of Emeline Salley, Saint Germain-en-Laye, France

Remarks

Velonalithus emelinesalleyae differs from the species of Triquetrorhabdulus by its length-slow (+) elongation, whereas the Triquetrorhabdulus species exhibit length-fast (-) elongation. Additionally, Velonalithus emelinesalleyae differs from Orthorhabdus serratus by having pointed ends, while the latter is pointed at one end but truncated at the other. Moreover, Velonalithus emelinesalleyae displays parallel extinction (with an extinction angle of 0°), whereas Orthorhabdus serratus exhibits inclined extinction (with an extinction angle of about 20°).

References

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.

Martini, E., 1965. Mid-Tertiary calcareous nannoplankton from Pacific deep-sea cores. Colston Papers 17, 393-411.

Olafsson, G., 1989. Quantitative calcareous nannofossil biostratigraphy of upper Oligocene to middle Miocene sediment from ODP Hole 667A and middle Miocene sediment from DSDP Site 574. Proceedings of the Ocean Drilling Program, Scientific Results 108, 9-22.

Varol, O. 2025. A practical guide to optical studies of calcareous nannofossils. Grzybowski Foundation Special Publication, 29, 222 pp.

Young, J. R. 1998. Neogene. In, Bown, P. R. (Ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 225-265.