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Pseudoceratium gochtii
Pseudoceratium gochtii Neale and Sarjeant, 1962
Now Pseudoceratium. Originally Pseudoceratium subgen. Eopseudoceratium, subsequently Eopseudoceratium, thirdly (and now) Pseudoceratium. Lentin and Williams, 1981 retained this species in Eopseudoceratium (Neale and Sarjeant, 1962) Lentin and Williams, 1973; however, Stover and Evitt, 1978 and Lentin and Williams, 1985 retained this species in Pseudoceratium.
Junior homonym: Pseudoceratium gochtii Pocock, 1962.
Holotype: Neale and Sarjeant, 1962, pl. 20, fig.3; text-fig. 5
Paratype: Neale and Sarjeant, 1962
Locus typicus: Speeton Clay, Heslerton, England
Stratum typicum: Late Hauterivian-middle Barremian
Original diagnosis: Neale and Sarjeant, 1962, 446-447: Pseudoceratium (Eopseudoceratium) gochtii
A species of Pseudoceratium having a laterally compressed theca in the form of a spherical triangle, the ventral surface forming the longest side, with three horns of unequal length arising from its angles. The longitudinal furrow is well marked and without spines. On its margins and on the boundaries of plates arise rows of
spines, simple bifurcate, or knobbed, sometimes arising from low ridges on the shell surface; elsewhere the shell has an irregular cover of very short spines of similar character. Tabulation 6", 5a, 6", 6""", ?4p, 4pc, 1pv, 1"""". The transverse furrow is narrow and poorly marked; it extends onto the dorsal horn. The apical horn is composed of six elongate, triangular plates; the antapical horn of a single plate.
Original description: Neale and Sarjeant, 1962, p. 447-448: Pseudoceratium (Eopseudoceratium) gochti
Shell pale yellowish-brown in colour; presence of a cyst not confirmed. Six apical plates; plate 1" the longest and situated in the anterior prolongation of the longitudinal furrow. Five anterior intercalary plates forming a definite series around the apex. Six pre-equatorial plates, with plates 3" and 4" dorsally drawn out to form
the anterior surface of the dorsal horn. Transverse furrow narrow, not or only very slightly spiral, its dorsal portion forming the median part of the dorsal horn. Six post-equatorial plates; with plate 6""" reduced and plate 3""" prolonged dorsally to form the posterior surface of the dorsal horn. Four posterior intercalary plates probably present, the existence of plate 4p not being certainly established. A further
four plates are present around the antapex; since these form a distinct series, they have been designated as plates of the posterior circle (1-4pc) following the precedent established for Pluriarvalium Sarjeant 1962. A posterior ventral plate occupies the posterior prolongation of the longitudinal furrow. The antapex and antapical horn are formed by a single plate.
The plate boundaries bear spines longer than those on the plates themselves, more closely set, and apparently stiffer, since they tend to have a distinct directional inclination common to several adjacent spines, whereas those elsewhere are very variously curved and bent, adjacent spines behaving quite differently, and their arrangement is wholly random. The transverse furrow is covered with spines and clearly functionless; the longitudinal furrow however lacks spines and enables ready orientation. In pylome formation, the apical portion of the shell breaks off, apparently along the line separating the anterior intercalary plates from the pre-equatorial series. Complete specimens were rare, the majority seen lacking the apex. A few detached apices were also seen.
Dimensions: Holotype; overall length 187 µm, overall breadth 93 µm.
Now Pseudoceratium. Originally Pseudoceratium subgen. Eopseudoceratium, subsequently Eopseudoceratium, thirdly (and now) Pseudoceratium. Lentin and Williams, 1981 retained this species in Eopseudoceratium (Neale and Sarjeant, 1962) Lentin and Williams, 1973; however, Stover and Evitt, 1978 and Lentin and Williams, 1985 retained this species in Pseudoceratium.
Junior homonym: Pseudoceratium gochtii Pocock, 1962.
Holotype: Neale and Sarjeant, 1962, pl. 20, fig.3; text-fig. 5
Paratype: Neale and Sarjeant, 1962
Locus typicus: Speeton Clay, Heslerton, England
Stratum typicum: Late Hauterivian-middle Barremian
Original diagnosis: Neale and Sarjeant, 1962, 446-447: Pseudoceratium (Eopseudoceratium) gochtii
A species of Pseudoceratium having a laterally compressed theca in the form of a spherical triangle, the ventral surface forming the longest side, with three horns of unequal length arising from its angles. The longitudinal furrow is well marked and without spines. On its margins and on the boundaries of plates arise rows of
spines, simple bifurcate, or knobbed, sometimes arising from low ridges on the shell surface; elsewhere the shell has an irregular cover of very short spines of similar character. Tabulation 6", 5a, 6", 6""", ?4p, 4pc, 1pv, 1"""". The transverse furrow is narrow and poorly marked; it extends onto the dorsal horn. The apical horn is composed of six elongate, triangular plates; the antapical horn of a single plate.
Original description: Neale and Sarjeant, 1962, p. 447-448: Pseudoceratium (Eopseudoceratium) gochti
Shell pale yellowish-brown in colour; presence of a cyst not confirmed. Six apical plates; plate 1" the longest and situated in the anterior prolongation of the longitudinal furrow. Five anterior intercalary plates forming a definite series around the apex. Six pre-equatorial plates, with plates 3" and 4" dorsally drawn out to form
the anterior surface of the dorsal horn. Transverse furrow narrow, not or only very slightly spiral, its dorsal portion forming the median part of the dorsal horn. Six post-equatorial plates; with plate 6""" reduced and plate 3""" prolonged dorsally to form the posterior surface of the dorsal horn. Four posterior intercalary plates probably present, the existence of plate 4p not being certainly established. A further
four plates are present around the antapex; since these form a distinct series, they have been designated as plates of the posterior circle (1-4pc) following the precedent established for Pluriarvalium Sarjeant 1962. A posterior ventral plate occupies the posterior prolongation of the longitudinal furrow. The antapex and antapical horn are formed by a single plate.
The plate boundaries bear spines longer than those on the plates themselves, more closely set, and apparently stiffer, since they tend to have a distinct directional inclination common to several adjacent spines, whereas those elsewhere are very variously curved and bent, adjacent spines behaving quite differently, and their arrangement is wholly random. The transverse furrow is covered with spines and clearly functionless; the longitudinal furrow however lacks spines and enables ready orientation. In pylome formation, the apical portion of the shell breaks off, apparently along the line separating the anterior intercalary plates from the pre-equatorial series. Complete specimens were rare, the majority seen lacking the apex. A few detached apices were also seen.
Dimensions: Holotype; overall length 187 µm, overall breadth 93 µm.