Larcopyle molle, 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 : 36-37

Larcopyle molle n. sp.

Figure 18.7-12

zoobank.org/ 85A0F286-30E4-4F44-A18D-9F4585A1ED53

Etymology. The Latin adjective “mollis” (-ie, -e), meaning gentle.

Holotype. Specimen in Figure 18.11-12 from the sample YDY05-01.

Paratype. Specimen in Figure 18.9-10 from the sample YDY05-01.

Description. Test is ellipsoid to slender ellipsoid in shape and consists of a pylodiscid-type central combination, one or two pseudo-concentric shells, and an outermost coverage shell. The central combination is obliquely oriented to the shorter axis of the test. The 1st pseudo-concentric shell is oblong in shape (the ratio of the longest axis (Ug-axis in Type 2 coordinates) to the shortest axis is 1.3–1.5) with large pores (3.6–7.8 μm in diameter). Large spaces exist between the central combination and the 1st pseudo-concentric shell, and these two parts are connected with two beams parallel to the Lt-axis direction, at least two apical rods, and at least three basal rods. The outermost coverage shell has a relatively rough surface. Space between the 1st pseudo-concentric shell and the outermost coverage shell is present throughout. A bore pylome is present on one side of the outermost coverage shell.

Remarks. Larcopyle molle n. sp. differs from both Larcopyle variabile ( Dreyer, 1889) and Larcopyle eccentricanoides n. sp. in that the latter two species have irregular contact between the outermost coverage shell and the 2nd pseudo-concentric shell and narrow space between the central combination and the 1st pseudo-concentric shell.

Dimensions. Based on the holotype specimen. The width of the central combination (S1a): 14.3 μm; The length of the S1a-girdle: 15.3 μm; The length of the 1st pseudo-concentric shell: 59.3 μm; The length and width of the outermost coverage shell: 97.8 μm and 55.3 μm. The length ratio to the width of the outermost coverage shell: ca. 1.8.

Figures

FIGURE 18. Photographs of the encountered morphotypes of Larcopyle. 1-6, Larcopyle variabile (Dreyer, 1889) sensu emend.; 7-12, Larcopyle molle n. sp.; 13-18, Larcopyle eccentricanoides n. sp.; 19-22, Larcopyle pulchella n. sp. All are Fr-view at Type 2. Scale bar equals 0.1 mm. All specimens are from YDY05-01.