Tholomura pilula, Zhang & Suzuki, 2017
publication ID |
https://doi.org/ 10.26879/718 |
publication LSID |
lsid:zoobank.org:pub:50E1E005-7E40-4DF5-A433-4EF50F6A865E |
persistent identifier |
https://treatment.plazi.org/id/C9B27FD8-534C-4B0F-AC43-920FF7E69BB0 |
taxon LSID |
lsid:zoobank.org:act:C9B27FD8-534C-4B0F-AC43-920FF7E69BB0 |
treatment provided by |
Felipe |
scientific name |
Tholomura pilula |
status |
sp. nov. |
Tholomura pilula View in CoL n. sp.
Figure 32.12-23 View FIGURE 32
zoobank.org/ C9B27FD8-534C-4B0F-AC43-920FF7E69BB0
Etymology. The Latin feminine noun “pilula ” (-ae), meaning a small sphere.
Holotype. Specimen in Figure 32.22-23 View FIGURE 32 from the sample YDY05-01.
Description. Test is spherical in shape with an S1a (microsphere), an ellipsoid 1st pseudo-concentric shell, and a spherical 2nd pseudo-concentric shell. No gates are present. The S1a appears elliptical from the Lt-view and circular from the Pl-view. The 1st pseudo-concentric shell comprises two 1st girdle-like cupolas that develop along the Lt-axis and two 2nd girdle-like cupolas that develop along the Sg-axis; these four girdle-like cupolas are completely connected to each other to form a closed, latticed pseudo-concentric shell. The 1st pseudo-concentric shell looks elliptical from the Pl- and Ltviews, and rounded quadrangular from the Sg-view. Pores of the 1st pseudo-concentric shell are circular to sub-circular in shape with relatively fine pore frames. Polar beams, an apical rod and a basal rod emerge from the S1a to pierce through the 1st pseudo-concentric shell. The 2nd pseudo-concentric shell comprises six cupolas to form a completely closed, latticed sphere. The 2nd pseudo-concentric shell is sub-spherical in shape. Six main cylindrical spines and eight polar spines extend linearly. The suture of the 2nd pseudo-concentric shell is visible under transmitted light microscopy but does not form depressions. Pores of the 2nd pseudo-concentric shell are polygonal in shape with fine pore frames.
Remarks. Tholomura pilula n. sp. is easily distinguished from all other species of Tholomura because it has a nearly complete spherical pseudo-concentric shell without fine coverage. Tholomura pilula n. sp. differs from Tholomura hexonia ( Haeckel, 1887) in that it has finer pores and apparent sutures between its cupolas. Tholomura pilula n. sp. appears to have three pseudo-concentric shells without clearly main or polar spines. These morphological characteristics may lead us to mistake specimens of this taxon as a member of Thecosphaera ; however, T. pilua n. sp. is different from Thecosphaera in its pyloniid internal structure. Dimensions. Based on the holotype specimen. The length and width of the 1st pseudo-concentric shell: 38.8 μm and 26.6 μm; The length and width of the 2nd pseudo-concentric shell: 68.8 μm and 67.7 μm. The ratio of length to width: ca. 1.5 (1st pseudo-concentric shell) and ca. 1.0 (2nd pseudo-concentric shell).
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