Amphiplecta acrostoma Haeckel, 1887

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 : 14

Amphiplecta acrostoma Haeckel, 1887

Plate 1, Figs. 1A – 2 .

Amphiplecta acrostoma n. sp., Haeckel, 1887, p. 1223 –1224, pl. 97, fig. 10.

Amphiplecta acrostoma Haeckel ; Benson, 1966, pl. 32, fig. 2.

Amphiplecta acrostoma Haeckel ; Petrushevskaya, 1971, p. 104, fig. 54, II–VII.

Amphiplecta acroctoma Haeckel [sic]; Nishimura and Yamauchi, 1984, pl. 24, fig. 2.

Amphiplecta acrostoma Haeckel ; Funakawa, 1994, p. 462 –463, fig. 6, 1a–1b.

Amphiplecta acrostoma Haeckel ; Okazaki et al., 2005, pl. 12, fig. 21.

Amphiplecta acrostoma Haeckel ; Hatakeda and Bjørklund, 2009, pl. 5, fig. 3.

? non Amphiplecta acrostoma Haeckel ; Sandoval, 2018, fig. 7A.

Amphiplecta acrostoma Haeckel, Trubovitz et al., 2020 , supplementary data 7.

Remarks. This is a well-documented species with consistent taxonomic usage. The material we observed compares favorably with most of the figured specimens in previous literature.

Range. Late Miocene—Recent 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).