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Corrudinium harlandii
From Fensome et al., 2019:
Corrudinium harlandii Matsuoka, 1983b, p.117–118, pl.4, figs.5a–c,6a–c,7a–b; text-figs.11A–B. Holotype: Matsuoka, 1983b, pl.4, figs.6a–c; Jan du Chêne et al., 1986a, pl.17, figs.15–17. Age: Pliocene or younger.
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Original description: [Matsuoka, 1983b]:
Corrudinium barlandii sp. nov.
PI. 4, figs. 5-7, Text-Fig. 11
?1979 Elipsoidinium sp. HARLAND, p. 539, pl. 2, figs. 17, 18.
Derivation of name: Refer to honor of Dr. REX HARLAND who first described this species from Bay of Biscay.
Diagnosis: Proximate cyst small, spherical to ovoidal. Surface of periphragm between parasuture and accessory parasuture distinctly striate. Accessory parasutural septa well developed. Paratabulation possibly 3-4', 6", 6c, 5-6'", 1p, 1"" and 4s. The precingular archeopyle formed by displacement of the 3" paraplate.
Holotype: KMD slide NNS 7-3 (14.2/138.3), pl. 4, fig. 6. Sample NNS 7, Nishiyama Formation - Pliocene or younger. Loc.: Haizume, Nishíyama-cho, Nigata Prefecture, Central Japan.
Description: The proximate cyst, without any apıcaí and antapical projections, is spherical to ovoidal and consists of two adpressed layers, periphragm and endophragm. The surface of periphragm excepting parasutural and accessory parsutural septa disctinctly appears coarsely striate. The accessory parasutures are distributed in each paraplate and weli developed. Therefore, it is very difficult to recognize parasutural septa from accessory parasutures. The paratabulation may be completely indicated by parasutural septa, but it is not known exactly because accessory parasutural septa completely develope. Its paratabulation may be of the gonyaulacacean type judging from the archeopyle, the paracingulum and parasulcus, and possibly denoted as 3-4', 6", 6c, 5-6'", 1p, 1"" and 4s(?). The archeopyle may be a precingular type having only one paraplate corresponding to the 3" paraplate. But it apparently consists of two precingular paraplates in specimens with accessory parasutural septa fully developed (pl. 4, fig. 6).
Dimensions: Holotype: Length of cyst 46 μm, width of cyst 42 μm, height of parasutural septa and accessory parasutural septa up to 4 μm. Other specimens: Length of cyst 40-53 μm, width of cyst 36-48 μm, height of parasutural and accessory parasutural septa up to 5.5 μm. Number of specimens measured: 25.
Occurrence: Rare to several in the Nishiyama Formation and its equivalent formations, and Haizume Formation (Pliocene to Early Pleistocene).
Remarks: This species with well developed accessory parasutural septa is closely similar to some species of the acritarch genus Cymatiosphaera, but differs from the latter in having a precingular archeopyle. Corrudininmn barlandii sp. nov. is different from C. incompositum (DrUGG) in possessing accessory parasutural septa fully developed and its relatively larger cyst body. The specimens described by HARLAND (1979) as ? Ellipsoidinium sp. may be assigned to the present new species on the basis of its characteristic periphragm.
Corrudinium harlandii Matsuoka, 1983b, p.117–118, pl.4, figs.5a–c,6a–c,7a–b; text-figs.11A–B. Holotype: Matsuoka, 1983b, pl.4, figs.6a–c; Jan du Chêne et al., 1986a, pl.17, figs.15–17. Age: Pliocene or younger.
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Original description: [Matsuoka, 1983b]:
Corrudinium barlandii sp. nov.
PI. 4, figs. 5-7, Text-Fig. 11
?1979 Elipsoidinium sp. HARLAND, p. 539, pl. 2, figs. 17, 18.
Derivation of name: Refer to honor of Dr. REX HARLAND who first described this species from Bay of Biscay.
Diagnosis: Proximate cyst small, spherical to ovoidal. Surface of periphragm between parasuture and accessory parasuture distinctly striate. Accessory parasutural septa well developed. Paratabulation possibly 3-4', 6", 6c, 5-6'", 1p, 1"" and 4s. The precingular archeopyle formed by displacement of the 3" paraplate.
Holotype: KMD slide NNS 7-3 (14.2/138.3), pl. 4, fig. 6. Sample NNS 7, Nishiyama Formation - Pliocene or younger. Loc.: Haizume, Nishíyama-cho, Nigata Prefecture, Central Japan.
Description: The proximate cyst, without any apıcaí and antapical projections, is spherical to ovoidal and consists of two adpressed layers, periphragm and endophragm. The surface of periphragm excepting parasutural and accessory parsutural septa disctinctly appears coarsely striate. The accessory parasutures are distributed in each paraplate and weli developed. Therefore, it is very difficult to recognize parasutural septa from accessory parasutures. The paratabulation may be completely indicated by parasutural septa, but it is not known exactly because accessory parasutural septa completely develope. Its paratabulation may be of the gonyaulacacean type judging from the archeopyle, the paracingulum and parasulcus, and possibly denoted as 3-4', 6", 6c, 5-6'", 1p, 1"" and 4s(?). The archeopyle may be a precingular type having only one paraplate corresponding to the 3" paraplate. But it apparently consists of two precingular paraplates in specimens with accessory parasutural septa fully developed (pl. 4, fig. 6).
Dimensions: Holotype: Length of cyst 46 μm, width of cyst 42 μm, height of parasutural septa and accessory parasutural septa up to 4 μm. Other specimens: Length of cyst 40-53 μm, width of cyst 36-48 μm, height of parasutural and accessory parasutural septa up to 5.5 μm. Number of specimens measured: 25.
Occurrence: Rare to several in the Nishiyama Formation and its equivalent formations, and Haizume Formation (Pliocene to Early Pleistocene).
Remarks: This species with well developed accessory parasutural septa is closely similar to some species of the acritarch genus Cymatiosphaera, but differs from the latter in having a precingular archeopyle. Corrudininmn barlandii sp. nov. is different from C. incompositum (DrUGG) in possessing accessory parasutural septa fully developed and its relatively larger cyst body. The specimens described by HARLAND (1979) as ? Ellipsoidinium sp. may be assigned to the present new species on the basis of its characteristic periphragm.