Lophophaena domovoi, Trubovitz, Sarah, Renaudie, Johan, Lazarus, David & Noble, Paula, 2022

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 : 56-57

Lophophaena domovoi n. sp.

Plate 30, Figs. 1A – 7B .

urn:lsid:zoobank.org:act:2C507BDD-D308-40B4-A308-4A8A9E987A94

unknown plagonid group C sp 20, Trubovitz et al., 2020, supplementary data 7.

Diagnosis. Lophophaena with a curved, hook-like apical spine and a thin, conical horn on the top of the cephalis.

Description. The cephalis of this species has two spines. One originates from the apical spine and is curved upward, resembling a hook or thorn, and extends outward from the dorsal side of the cephalis, well below the apex. The second spine is conical with a pointed tip, extends from the apex of the cephalis, and is not related to any of the primary skeletal spines. Pores on the cephalis are small and round, and decrease in size from the base to the top of the cephalis. The thorax is wider than the cephalis to varying degrees, but not dramatically so. There are strong indentations on the thorax where the lateral and dorsal spines run along the shell wall before extending outside the thorax as short appendages.

Remarks. Some specimens of this species can have few, or very small pores, such as the specimen in Figure 5 (seen from dorsal side). The size of this species is significantly smaller than Lophophaena ikota n. sp. (Pl. 33, Figs. 1A – 7B ), and it also differs in that the apical spine is more pronounced.

Material examined. 18 specimens observed from samples 321-1337A-31X-6W, 4–6cm (Middle Miocene) and 321-1337D-23H-6, 134–137cm (Late Miocene).

Holotype. Pl. 30, figs. 1A–C; sample 321-1337D-23H- 6, 134– 137cm ; ECO-147; K30-4 .

Paratypes. (1) Pl. 30, fig. 2; sample 321-1337D-23H- 6, 134–137cm; ECO-147; F8-1. (2) Pl. 30, figs. 3AB; sample 321-1337D-23H- 6, 134–137cm; ECO-146; T 35-1. (3) Pl. 30, figs. 7A–B; sample 321-1337D-23H- 6, 134–137cm; ECO-145; K25-2. (4) Pl. 30, fig. 5; sample 321-1337D-23H- 6, 134–137cm; ECO-146; M9-1. (5) [not figured] sample 321-1337D-23H- 6, 134–137cm; ECO-146; N37-3.

Measurements. Cephalis height 40–49 (45)μm; cephalis width 29–38 (35)μm; neck width 25–31 (28)μm; width at shoulders 40–57 (46)μm. Based on 15 specimens.

Etymology. Named for the house spirit in Slavic folklore, the Domovoi.

Range. Middle—Late Miocene, EEP ( Table 1 ). Lower limit not determined.

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

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