Qiuripylolena? multiconcentrica, 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 : 54

Qiuripylolena? multiconcentrica n. sp.

Figure 30.23 -34

zoobank.org/ 90991B16-59B8-4FC7-AFDE-6E0092B4DE39

1976 Lithelius spp. aff. alveolina Haeckel; Renz, p. 91-92, pl. 1, fig. 17.

cf. 1985 Tholospira cervicornis Haeckel ; Boltovskoy and Jankilevich, pl. 3, fig. 21.

1995 Pylonidae gen. et sp. van de Paverd, pl. 58, fig. 4.

Etymology. The Latin prefix “multi-“and adjective “concentricus” (-a, -um), meaning many concentric shells.

Holotype. Specimen in Figure 30.31-32 from the sample YDY05-01.

Paratype. Specimen in Figure 30.33 -34 from the sample YDY05-01.

Description. Test is elliptical in shape and consists of a probable larnacillid central combination, an elliptical to distorted pseudo-concentric shell, and two or three ellipsoid complete pseudo-concentric shells. Pore frames of the pseudo-concentric shells are robust; the pores are circular to sub-circular in shape and moderate in size. The size ratio is nearly the same between the 1st and 2nd pseudo-concentric shells, and the size ratio of the 3rd concentric shell to the 2nd concentric shell yields a smaller value (1.5–1.6). Pseudo-concentric shells are connected to each other by numerous pillar beams. These beams pierce through the outermost pseudo-concentric shell to form short spines that are similar to by-spines.

Remarks. The 1st pseudo-concentric shell of Qiuripylolena? multiconcentrica n. sp. is more ellipsoid that Qiuripylolena chikuchik n. sp., and smaller than that of Qiuripylolena pompon n. sp. Qiuripylolena? multiconcentrica n. sp. generally has more concentric shells than Qiuripylolena chikuchik n. sp. and Qiuripylolena pompon n. sp. Qiuripylolena chikuchik n. sp. and Qiuripylolena pompon n. sp. have a wider chamber than Qiuripylolena? multiconcentrica n. sp.

Dimensions. Based on the holotype specimen. The length and width of the 3rd pseudo-concentric shell: 109.5 μm and 100.0 μm; The ratio of length to width of the 3rd pseudo-concentric shell: ca. 1.1. The size ratio of the 1st pseudo-concentric shell to the central combination: ca. 2.6; The size ratio of the 2nd pseudo-concentric shell to the 1st pseudo-concentric shell: ca. 2.1.

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.

FIGURE 31. Photographs of the encountered morphotypes of Circodiscus. 1-2, Circodiscus amphitrites (Ehrenberg, 1854b); 3-4, Circodiscus biorbiculus n. sp.; 5-14, Circodiscus microporus (Stöhr, 1880); and 15-16, Circodiscus pseudomicroporus n. sp. All are Sg-view at Type1, Fr-view at Type 2. Scale bar equals 0.1 mm. All specimens are from YDY05-01.

FIGURE 32. Photographs of the encountered morphotypes of Tholomura. 1-11, Tholomura hexonia (Haeckel, 1887); 12-23, Tholomura pilula n. sp.; 24-32, Tholomura polystyla (Chen, 1987). 1-16, 19-23, 26-32, Pl-view at Type 1; 17- 18, 24-25, Lt-view at Type 1. Scale bar equals 0.1 mm. All specimens are from YDY05-01.