Pelagomanes? 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 : 84

Pelagomanes? sp. C

Plate 42, Figs. 4A – 5B .

unknown plagonid group C sp 60, partim., Trubovitz et al., 2020, supplementary data 7.

Remarks. This species has a small, rounded thorax that is enclosed on the bottom, differentiating it from the other described Pelagomanes taxa, but making it similar to one specimen of Pelagomanes ? sp. B (Pl. 42, Fig. 2 ). At least six feet protrude from the thorax, just above its base, which is a characteristic shared with Pelagomanes kozoi as well as Pelagomanes ? sp. B. It resembles Pseudodictyophimus gracilipes bicornis Petrushevskaya,1967 except that it always has more than three feet, which excludes it from being in Pseudodictyophimus .

Material examined. 4 specimens observed from sample 321-1337A-31X-6, 4–6cm (Middle Miocene).

Range. Middle Miocene in the EEP, range not well constrained ( Table 1 ).

Figures

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.