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Hystrichosphaera ceratioides
Hystrichosphaera ceratioides Deflandre, 1937b, p.66–67, pl.12 (al. pl.9), figs.7–8.
NOW Xenascus. Originally Hystrichosphaera, subsequently Pseudoceratium, thirdly Spiniferites, fourthly Phoberocysta, fifthly (and now) Xenascus.
Taxonomic junior synonyms: Endoceratium (now Xenascus) perforatum, according to Davey and Verdier (1971, p.27) — however, Yun Hyesu (1981, p.62) retained Xenascus perforatus; Xenascus australiensis, according to Davey and Verdier (1971, p.26) — however, Lentin and Williams (1985, p.374) retained Xenascus australiensis; Odontochitina blastema, according to Davey and Verdier (1971, p.27) — however, Stover and Helby (1987a, p.128) retained Odontochitina (as Xenascus) blastema.
Holotype: Deflandre, 1937b, pl.12 (al. pl.9), figs.7–8; Fensome et al., 1991, fig.1 - p.601; fig.1 - p.605.
Paratype: Deflandre, 1937
Locus typicus: Paris, France
Stratum typicum: Senonian
Translation Deflandre, 1937: LPP
Deflandre 1937, p. 66-67
Diagnosis (annotated): this species shows the general characteristic of an equatorial system of elongate plates. There are also a number of furcate appendices, unfortunately partially broken in the best specimen presented here. Since the poles of the organism cannot be distinguished, it has been oriented arbitrarily. The upper part bears a blunt cone as well as several other protruberances, whereas the oppsite pole bears a single, heavy and elongate horn, which seems easily detachable, because it is missing in the second specimen, the paratype. A subcylindrical furcate horn, situated on the anterior part, is present on both specimens (holotype and paratype). Several spines and horns are arranged around the equator and on various locations on the body. As is shown in the illustration, the posterior part shows sutures which confine a system of plates.
Dimensions: total length about 172 µm, breadth about 40 µm.
NOW Xenascus. Originally Hystrichosphaera, subsequently Pseudoceratium, thirdly Spiniferites, fourthly Phoberocysta, fifthly (and now) Xenascus.
Taxonomic junior synonyms: Endoceratium (now Xenascus) perforatum, according to Davey and Verdier (1971, p.27) — however, Yun Hyesu (1981, p.62) retained Xenascus perforatus; Xenascus australiensis, according to Davey and Verdier (1971, p.26) — however, Lentin and Williams (1985, p.374) retained Xenascus australiensis; Odontochitina blastema, according to Davey and Verdier (1971, p.27) — however, Stover and Helby (1987a, p.128) retained Odontochitina (as Xenascus) blastema.
Holotype: Deflandre, 1937b, pl.12 (al. pl.9), figs.7–8; Fensome et al., 1991, fig.1 - p.601; fig.1 - p.605.
Paratype: Deflandre, 1937
Locus typicus: Paris, France
Stratum typicum: Senonian
Translation Deflandre, 1937: LPP
Deflandre 1937, p. 66-67
Diagnosis (annotated): this species shows the general characteristic of an equatorial system of elongate plates. There are also a number of furcate appendices, unfortunately partially broken in the best specimen presented here. Since the poles of the organism cannot be distinguished, it has been oriented arbitrarily. The upper part bears a blunt cone as well as several other protruberances, whereas the oppsite pole bears a single, heavy and elongate horn, which seems easily detachable, because it is missing in the second specimen, the paratype. A subcylindrical furcate horn, situated on the anterior part, is present on both specimens (holotype and paratype). Several spines and horns are arranged around the equator and on various locations on the body. As is shown in the illustration, the posterior part shows sutures which confine a system of plates.
Dimensions: total length about 172 µm, breadth about 40 µm.