Lophophaena sp. L

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 : 72

Lophophaena sp. L

Plate 29, Figs. 7A – 8D .

unknown plagonid group C sp 71, Trubovitz et al., 2020, supplementary data 7.

Remarks. This species has a large hump on the upper part of the thorax, and relatively large AL arches. The cephalis is somewhat rectangular in shape, with flattened sides and a point at the apex. Pores on the thorax can be slightly irregular in size and shape. This species differs from Lophophaena nadezdae (Pl. 23, Figs. 1A – 2C ) in that it lacks spines on the thorax, other than the lateral and dorsal spines, and has a relatively broader cephalis.

Material examined. 4 specimens observed from samples 321-1337D-23H- 6, 134–137cm (Late Miocene), 321- 1337A-10H-2, 91–94cm (Early Pliocene), 321-1337A-7H- 6, 104–107cm (Early Pliocene), and 321-1337A-4H- 6, 115–118cm (Late Pleistocene).

Range. Late Miocene—Late Pleistocene, 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).

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

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