Disphaeria succincta (Morgenroth, 1966) Norvick, 1973

Now Thalassiphora. Originally (and now) Thalassiphora, subsequently Disphaeria.
Lentin and Williams, 1977, retained the species in Thalassiphora Eisenack and Gocht, 1960.

Holotype: Morgenroth, 1966, pl.2, fig.7
Age: Early Oligocene

Original description Morgenroth 1966


Thalassiphora succincta
Plate 2, Fig. 7, 8, 9
Derivatio nominis: succingere lat. = strap around
Holotypus: The in Slide H18 preserved specimen shown on plate 2, fig. 7. Paratype: HS, H12, H18丨II.
Locus typicus: Depold'sche Ziegelei (south from Helmstedt).
Stratum typicum: Lower Oligocene

Diagnosis: A relatively small species with the characteristics of the genus Thalassiphora. Below the dorsally located pylomas runs across
the smooth, delicate wing membrane has a clearly pronounced furrow.

Description: The thin-walled ellipsoic central body has a trapezoid pylom located below one pole. On the dorsal side of the central capsule is the key-shaped, delicate, structureless capsule attached to the outer membrane, which clearly inwards at its outer edges and therefore has a somewhat narrowed ventral opening. Over the dorsal side of the outer membrane - below the pylomas —a clear furrow in all specimens (see Plate 2, Figs. 7, 9). This well-defined groove shows the same orientation as that found in dinoflagellates. Therefore it must necessarily be regarded as a true transverse furrow.

Dimensions:
Cyst body length: 43µ (36µ–47µ)
Cyst body width: 34µ (28µ–42µ)
Cyst length: 74µ (67µ–81µ)
Cyst width: 68µ (59µ–73µ)
Archeopyle circumference ca. 19 X 16 µ
(21 measurements)
Number of examined specimens: 21

Comparison: So far, no species of the genus Thalassiphora is known to be so small and with a transverse groove on the outer membrane.