Ceratocyrtis sp. C

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. C

Plate 13, Figs. 1A – 2B .

Ceratocyrtis sp 5 , Trubovitz et al., 2020, supplementary data 7.

Remarks. The cephalis of this species is relatively large for the genus. It has a strong conical apical spine that protrudes out the side of the cephalis before nearing the apex, which can have a slightly triangular shape in some specimens (as in pl. 13, fig. 1). This species has a tapering thorax, which is unusual among the Ceratocyrtis species observed in this study. The shell reaches its widest point approximately 1/3 down the thorax. Pore size is mostly uniform throughout the cephalis and thorax. Only three specimens were observed, so additional study is needed.

Material examined. 3 specimens observed from samples 321-1337A-6H-3, 29–32cm (Late Pliocene), and 321-1337A-4H- 6, 115–118cm (Early Pleistocene).

Range. Late Pliocene– Early Pleistocene in the EEP ( Table 1 ).

Figures

FIGURE 1. Diagram illustrating the general skeletal morphology of Lophophaenidae, and terminology used in this manuscript. Dashed lines indicate spines that are not visible from the angle shown, as they extend into the skeleton. An example specimen of Lophophaena casperi n. sp. is included for comparison to the diagrams.

FIGURE 2. Relative abundance of specimens and taxa belonging to Plagiacanthoidea and Lophophaenidae per sample, from IODP Site U1337 in the EEP over the last ~10 Ma. The relative percentages of total taxa are represented by the blue lines and the red lines represent the percentages of total specimens (triangles = Plagiacanthoidea; circles = Lophophaenidae). The Plagiacanthoidea was among the most abundant and speciose of radiolarian groups encountered in Trubovitz et al. (2020), with at least 10% of the specimens and 20% of the taxonomic richness in every sample. Within the Plagiacanthoidea, lophophaenids consistently made up the majority of specimens (~67%) and taxa (~61%). Data are from Trubovitz et al. (2020).