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Speetonia delicatula
Speetonia delicatula Duxbury, 1977
Now Lagenorhytis. Originally Speetonia (an illegitimate generic name), subsequently (and now) Lagenorhytis.
Holotype: Duxbury, 1977, pl.2, fig.4
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Valanginian
Original diagnosis: Duxbury, 1977, p. 49
A thin-walled proximate cyst. Test spheroidal to ovoidal, produced into a strong, broadbased projection. The body surface displays no tabulation except for a large, precingular archeopyle formed by the loss of two plates. Body finely to coarsely granular and usually covered by an apparently random scatter of small tubercles. The tip of the apical projection sometimes bears a small, irregular terminal structure. Observed Dimensions: Holotype 88 x 73 µm. Overall 118(95)75 x 103(82)61 µm.
Remark:
Duxbury, 1977, p. 49: Well-preserved specimens of Speetonia delicatula are rare. Usually, the body is folded or broken to some extent. Nevertheless, the large, unornamonted test (except for small tubercles) and two-plate precingular archeopyle are usually very distinctive.
Now Lagenorhytis. Originally Speetonia (an illegitimate generic name), subsequently (and now) Lagenorhytis.
Holotype: Duxbury, 1977, pl.2, fig.4
Locus typicus: Speeton Clay, Speeton, England
Stratum typicum: Valanginian
Original diagnosis: Duxbury, 1977, p. 49
A thin-walled proximate cyst. Test spheroidal to ovoidal, produced into a strong, broadbased projection. The body surface displays no tabulation except for a large, precingular archeopyle formed by the loss of two plates. Body finely to coarsely granular and usually covered by an apparently random scatter of small tubercles. The tip of the apical projection sometimes bears a small, irregular terminal structure. Observed Dimensions: Holotype 88 x 73 µm. Overall 118(95)75 x 103(82)61 µm.
Remark:
Duxbury, 1977, p. 49: Well-preserved specimens of Speetonia delicatula are rare. Usually, the body is folded or broken to some extent. Nevertheless, the large, unornamonted test (except for small tubercles) and two-plate precingular archeopyle are usually very distinctive.