Qiuripylolena chikuchik, Zhang & Suzuki, 2017

Zhang, Lanlan & Suzuki, Noritoshi, 2017, Taxonomy and species diversity of Holocene pylonioid radiolarians from surface sediments of the northeastern Indian Ocean, Palaeontologia Electronica (Cambridge, England: 2003) 7 (8), pp. 1-68 : 52

Qiuripylolena chikuchik n. sp.

Figure 30.1-10

zoobank.org/ 9AAEAF52-F1F3-447B-970D-D7F9DC70862E

Etymology. The Latinized neuter noun from a Japanese word “chikuchiku”, meaning spiny.

Holotype. Specimen in Figure 30.9-10 from the sample YDY05-01.

Paratype. Specimen in Figure 30.3-4 from the sample YDY05-01.

Description. Test is elliptical to spherical in shape and consists of a central combination, a pseudo-concentric shell, and a complete concentric shell. The side of the pseudo-concentric shell is close to the central combination and the other side stands wide apart from the central combination. Pore frames of the concentric shell are robust; the pores are polygonal in shape and large in size. Many fine spines are radially distributed over the concentric shell.

Remarks. Qiuripylolena chikuchik n. sp. is similar to Qiuripylolena pompon n. sp. in that the latter has a pseudo-concentric shell and a concentric shell. However, the latter taxon generally has a more spherical concentric shell with pores that appear to be smaller. And the size of the 1st pseudo-concentric shell of Qiuripylolena pompon n. sp. is larger than that of Qiuripylolena chikuchik n. sp. Qiuripylolena chikuchik n. sp. is easily distinguished from Qiuripylolena? multiconcentrica n. sp. based on the former’s absence of an elliptical pseudo-concentric shell and the former’s presence of larger 1st pseudo-concentric shell and more width chamber.

Dimensions. Based on the holotype specimen. The length and width of the outer concentric shell: 103.6 μm and 88.1 μm; The ratio of length to width of the outer concentric shell: ca. 1.2. The space width between the outer concentric shell and the 1st pseudo-concentric shell: 28.6 μm; The space width between the 1st pseudo-concentric shell and the central combination: 13.9 μm.

Figures

FIGURE 30. Photographs of the encountered morphotypes of Qiuripylolena. 1-10, Qiuripylolena chikuchik n. sp.; 11- 22, Qiuripylolena pompon n. sp.; 23-34, Qiuripylolena? multiconcentica n. sp. All are Sg-view at Type 1. Scale bar equals 0.1 mm. All specimens are from YDY05-01.