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Deflandrea plea
Deflandrea? plea (Tasch, 1964) Lentin and Williams, 1973
Originally Peridinium, subsequently (and now) Deflandrea?, thirdly Gonyaulacysta?.
Lentin and Williams, 1976, questionably transferred this species to Gonyaulacysta Deflandre, 1964. Stover and Evitt, 1978, retained it in Deflandrea.
Stover and Evitt, 1978, considered this to be a problematical species of Deflandrea.
At the time of the transfer, Lentin and Williams, 1973, questionably included this species in Deflandrea.
Holotype: Tasch, 1964, pl.1, fig.15
Age: Albian
(Tasch, 1964)
Diagnosis: Full, spherical theca, bearing a brief, apical horn, and very broad antapical horns. Epithecal plate system partially defined, but apical plates unclear and hypothecal plates not distinguishable. Broad, dark, central band which loops around anteriorly is a contracted cyst. Epitheca gently tapered apically, an about twice as large as hypotheca.
Measurements: lenth, excluding apical horn, 68 µm; width, 62 µm; width of girdle, 5 µm; length of apical horn, 6 µm.
Discussion: Living species assigned to the genus Peridinium embrace a wide range of morphologies. Fossil species assigned to this genus are generally less variable in morphology. This new species describes herein is unlike any previously assigned to this genus in the nature of antapical horns and the more spherical configuration. It is strictly different from P. kansanum Tasch, n. sp. (plate 1, figure 1).
Holotype: WU-DF 0163. Slide no. 1016. Coordinates: R 29, D 15.5+
Locality: Sampling interval 4-1-H.
Originally Peridinium, subsequently (and now) Deflandrea?, thirdly Gonyaulacysta?.
Lentin and Williams, 1976, questionably transferred this species to Gonyaulacysta Deflandre, 1964. Stover and Evitt, 1978, retained it in Deflandrea.
Stover and Evitt, 1978, considered this to be a problematical species of Deflandrea.
At the time of the transfer, Lentin and Williams, 1973, questionably included this species in Deflandrea.
Holotype: Tasch, 1964, pl.1, fig.15
Age: Albian
(Tasch, 1964)
Diagnosis: Full, spherical theca, bearing a brief, apical horn, and very broad antapical horns. Epithecal plate system partially defined, but apical plates unclear and hypothecal plates not distinguishable. Broad, dark, central band which loops around anteriorly is a contracted cyst. Epitheca gently tapered apically, an about twice as large as hypotheca.
Measurements: lenth, excluding apical horn, 68 µm; width, 62 µm; width of girdle, 5 µm; length of apical horn, 6 µm.
Discussion: Living species assigned to the genus Peridinium embrace a wide range of morphologies. Fossil species assigned to this genus are generally less variable in morphology. This new species describes herein is unlike any previously assigned to this genus in the nature of antapical horns and the more spherical configuration. It is strictly different from P. kansanum Tasch, n. sp. (plate 1, figure 1).
Holotype: WU-DF 0163. Slide no. 1016. Coordinates: R 29, D 15.5+
Locality: Sampling interval 4-1-H.