Ceratocyrtis sp. B

Trubovitz, Sarah, Renaudie, Johan, Lazarus, David & Noble, Paula, 2022, Late Neogene Lophophaenidae (Nassellaria, Radiolaria) from the eastern equatorial Pacific, Zootaxa 5160 (1), pp. 1-158 : 35

Ceratocyrtis sp. B

Plate 10, Figs. 7A – 9B .

unknown plagonid group E sp. 3 cf, Trubovitz et al., 2020, supplementary data 7.

Remarks. This species has pores on the thorax that increase in size dramatically from top to base. Thorax flares outward more widely than most other Ceratocyrtis species. The shell wall was thickly silicified in the specimens observed during this study. The axobate is dendritic, clearly placing this species within Ceratocyrtis . This species differs from Tetraphormis dodecaster Haeckel, 1887 in that it is much larger, has thicker bars between pores, has a dendritic axobate, and does not have ribs running down the thorax.

Material examined. 12 specimens from samples 321-1337D-23H- 6, 134–137cm (Late Miocene), 321-1337A-16H- 6, 121–124cm (Late Miocene), 321-1337A-14H-7, 39–42cm (Late Miocene), 321-1337A-12H-5, 23–26cm (Late Miocene), 321-1337A-6H-3, 29–32cm (Late Pliocene), 321-1337A-5H-5, 11–14cm (Late Pliocene), 321- 1337A-4H- 6, 115–118cm (Early Pleistocene), 321-1337A-4H-2, 16–19cm (Middle Pleistocene), and 321-1337D-1H-1, 0–3cm (Recent).

Range. Late Miocene—Recent in the EEP ( Table 1 ).

Figures

FIGURE 7. Internal skeletal structure of Arachnocorys umbellifera (Haeckel, 1862) Petrushevskaya, 1971.

FIGURE 9. Internal skeletal structure of Ceratocyrtis sp. C.