Back
Votadinium concavum
Original description: [Gurdebeke et al., 2019]:
Votadinium concavum sp. nov.
Gurdebeke, Mertens, Matsuoka, Gu, & Louwye
Plate 1, figures 8–10
Synonymy.
2011 Cyst of Protoperidinium sp.: Attaran-Fariman et al., figs 12–15.
2012 Votadinium calvum: Liu et al., fig. 3v.
Motile stage equivalent. Unidentified.
Holotype. SEM stub of WN142 from the Bohai Sea (39°55.8640’N, 119°44.1280’E).
Repository. Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China.
Diagnosis. Broad cysts with concave outline on both epi- and hypocyst, and shallow antapical concavity. Cyst wall smooth and pale brown. Archeopyle seems to partly involve the apex. Description. The concavity of the ambitus may be less obvious in some specimens (Plate 1, figure 8). No obvious flagellar scar was observed (Plate 1, figure 8), but the sulcal depression is often roughened, which might obliterate such a structure.
Remarks. The small number of cysts observed does not allow an extensive formal description. This, along with the identification of the motile stage using incubation experiments, will be the focus of future work.
Dimensions. Length (L) 65–85 µm; width (W) 65–85 µm (N ¼ 2), with an average L/W of 0.96.
Comparison. Votadinium concavum mostly resembles V. calvum, but is broader and typically has a less rounded and more concave outline. Votadinium concavum has a more typical concave outline and a more shallow antapical concavity than V. rhomboideum. Absence of ornamentation distinguishes V. concavum from V. spinosum and V. pontifossatum. The lower L/W distinguishes V. concavum from V. elongatum, V. nanhaiense, V. pontifossatum and V. reidii.
Distribution and stratigraphic range. In modern sediments from the East China Sea and Bohai Sea. Based on the synonymy also off the coast of Iran and in the Yellow Sea.
Votadinium concavum sp. nov.
Gurdebeke, Mertens, Matsuoka, Gu, & Louwye
Plate 1, figures 8–10
Synonymy.
2011 Cyst of Protoperidinium sp.: Attaran-Fariman et al., figs 12–15.
2012 Votadinium calvum: Liu et al., fig. 3v.
Motile stage equivalent. Unidentified.
Holotype. SEM stub of WN142 from the Bohai Sea (39°55.8640’N, 119°44.1280’E).
Repository. Third Institute of Oceanography, State Oceanic Administration, Xiamen, 361005, China.
Diagnosis. Broad cysts with concave outline on both epi- and hypocyst, and shallow antapical concavity. Cyst wall smooth and pale brown. Archeopyle seems to partly involve the apex. Description. The concavity of the ambitus may be less obvious in some specimens (Plate 1, figure 8). No obvious flagellar scar was observed (Plate 1, figure 8), but the sulcal depression is often roughened, which might obliterate such a structure.
Remarks. The small number of cysts observed does not allow an extensive formal description. This, along with the identification of the motile stage using incubation experiments, will be the focus of future work.
Dimensions. Length (L) 65–85 µm; width (W) 65–85 µm (N ¼ 2), with an average L/W of 0.96.
Comparison. Votadinium concavum mostly resembles V. calvum, but is broader and typically has a less rounded and more concave outline. Votadinium concavum has a more typical concave outline and a more shallow antapical concavity than V. rhomboideum. Absence of ornamentation distinguishes V. concavum from V. spinosum and V. pontifossatum. The lower L/W distinguishes V. concavum from V. elongatum, V. nanhaiense, V. pontifossatum and V. reidii.
Distribution and stratigraphic range. In modern sediments from the East China Sea and Bohai Sea. Based on the synonymy also off the coast of Iran and in the Yellow Sea.