Pelagomanes? piperata ( Renaudie and Lazarus, 2015 )

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 : 82

Pelagomanes? piperata ( Renaudie and Lazarus, 2015) n. comb.

Plate 42, Figs. 6–8 .

Botryopera piperata n. sp., Renaudie and Lazarus, 2015, pl. 7, figs. 6–9B.

Remarks. This species was not observed in the EEP, but it is the authors’ opinion that it fits the definition of Pelagomanes better than Botryopera , and thus is tentatively included here. The specimens on Pl. 42, Figs. 6–8 are from the Early Miocene Southern Ocean; photographs are reproduced from Renaudie and Lazarus (2015). Pelagomanes ? piperata has a distinct upward-curving hooklike apical horn, a strong triangular ventral horn, shoulders, ribs, and teeth on the thorax, which are all typical of Pelagomanes . In addition, this species has the unusual character of a plate covering the aperture of the thorax. A similar feature was present on some specimens of Pelagomanes ibburi n. sp. (Pl. 41, Figs. 1A – 6B ), as well as one specimen of Pelagomanes ? sp. B (Pl. 42, Fig. 2 ) and all specimens of Pelagomanes ? sp. C (Pl. 42, Figs. 4A – 5B ).

Range. Late Oligocene—Pleistocene in the SO (reported by Renaudie and Lazarus, 2015).

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).

FIGURE 4. Examples of specimen measurements discussed in the Systematic Paleontology section of this study.

FIGURE 5. Internal skeletal structure of Amphiplecta acrostoma Haeckel, 1887.

FIGURE 6. Internal skeletal structure of Arachnocorallium calvata (Haeckel, 1887) Petrushevskaya, 1971.

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

FIGURE 8. Internal skeletal structure of Botryopera amabie n. sp.