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Codoniella prisca
Plate 8, Figures 15-17
Holotype: Plate 8, Figure 17
Paratype: Plate 8, Figure 16
Type Locality: Vergol outcrop, early Valanginian, Bed V97M, inostranzewi ammonite Zone, platycostatus Sub-zone. Holotype: Slide V97M(A), E.F. K41.2. Paratype: Slide V88B, E.F. K46.3.
Derivation of Name: From the Latin priscus, ancient - in reference to its occurrence relative to other members of the genus.
Diagnosis: A fairly thick-walled species of Codoniella which lacks cingular tabulation and sutural thickenings between the pre- and post-cingular plates. The crests surrounding the apical and antapical regions are moderately high, forming funnel-like structures which tend to widen distally. The apical structure is normally lower than the antapical, both exhibit microfenestration and some longitudinal striation can occur. The archeopyle is single- plate precingular.
Dimensions: Holotype 51 × 30 μm. Paratype 51 × 33 μm.
Overall 51 (50) 48 μm × 33 (32) 30 μm.
Specimens measured – 5.
Remarks: Like the type species, Codoniella campanulata (Cookson and Eisenack 1960) Downie and Sarjeant 1965, C. prisca n. sp. is characterized by its funnel-shaped, membranous structures extending apically and antapically from a non-tabulate endocyst. It differs, however, in having a thicker cyst wall and lower apical and antapical structures which are microfenestrate and can have longitudinal striations.
Codoniella campanulata was recorded by Cookson and Eisenack (1960) from the Cenomanian to ?Santonian of Western Australia and by Davey (1979a) from the late Albian of IPOD Leg 48, Hole 400A, northern Bay of Biscay. A second species, Codoniella psygma Davey 1979a, was recorded by Davey (op. cit.) from the Apto-Albian, and it was also restricted to a near-base Albian sample in DSDP Site 535, Leg 77, Southeastern Gulf of Mexico (Riley and Fenton 1984). Codoniella prisca n. sp. was restricted to the latest early Valanginian at Vergol, inostranzewi ammonite Zone, Beds V88 (inostranzewi Sub-zone) to V97M (platycostatus Sub-zone), and is therefore significantly older than other representatives of this genus.
Holotype: Plate 8, Figure 17
Paratype: Plate 8, Figure 16
Type Locality: Vergol outcrop, early Valanginian, Bed V97M, inostranzewi ammonite Zone, platycostatus Sub-zone. Holotype: Slide V97M(A), E.F. K41.2. Paratype: Slide V88B, E.F. K46.3.
Derivation of Name: From the Latin priscus, ancient - in reference to its occurrence relative to other members of the genus.
Diagnosis: A fairly thick-walled species of Codoniella which lacks cingular tabulation and sutural thickenings between the pre- and post-cingular plates. The crests surrounding the apical and antapical regions are moderately high, forming funnel-like structures which tend to widen distally. The apical structure is normally lower than the antapical, both exhibit microfenestration and some longitudinal striation can occur. The archeopyle is single- plate precingular.
Dimensions: Holotype 51 × 30 μm. Paratype 51 × 33 μm.
Overall 51 (50) 48 μm × 33 (32) 30 μm.
Specimens measured – 5.
Remarks: Like the type species, Codoniella campanulata (Cookson and Eisenack 1960) Downie and Sarjeant 1965, C. prisca n. sp. is characterized by its funnel-shaped, membranous structures extending apically and antapically from a non-tabulate endocyst. It differs, however, in having a thicker cyst wall and lower apical and antapical structures which are microfenestrate and can have longitudinal striations.
Codoniella campanulata was recorded by Cookson and Eisenack (1960) from the Cenomanian to ?Santonian of Western Australia and by Davey (1979a) from the late Albian of IPOD Leg 48, Hole 400A, northern Bay of Biscay. A second species, Codoniella psygma Davey 1979a, was recorded by Davey (op. cit.) from the Apto-Albian, and it was also restricted to a near-base Albian sample in DSDP Site 535, Leg 77, Southeastern Gulf of Mexico (Riley and Fenton 1984). Codoniella prisca n. sp. was restricted to the latest early Valanginian at Vergol, inostranzewi ammonite Zone, Beds V88 (inostranzewi Sub-zone) to V97M (platycostatus Sub-zone), and is therefore significantly older than other representatives of this genus.