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Gochteodinia brevispina
Plate 8, Figures 13, 18
Gochteodinia sp. D3E. – DUXBURY 2019, p. 195, pl. 20, fig. 8
Holotype: Plate 8, Figure 13.
Paratype: Plate 8 Figure 18.
Type Locality: Speeton Clay Formation, early Valanginian. Holotype: Speeton Outcrop, Slide D3E(K-2), early Valanginian,
Polyptychites ammonite Zone. E.F. K48.2. Paratype: Vergol Outcrop, Slide V124M, late Valanginian, peregrinus ammonite Zone.
E.F. V38.0.
Derivation of Name: From the Latin brevis, short and spina, thorn – in reference to the much reduced ornament of this species.
Diagnosis: A small, rotund species with a short, bluntly rounded apical horn. The entire cyst surface is finely and evenly granular and bears short, solid, distally-tapering, flat-ended processes, occasionally with a small number of very short terminal spines. Tabulation is expressed only by the archeopyle margin, which involves the displacement of two intercalary plates.
Dimensions: Holotype: Body length - 40 μm. Width - 34 μm.
Paratype Length - 35 μm. Width - 33 μm.
Overall 43 (39) 35 μm ×35 (34) 33 μm
Specimens measured - 4.
Remarks: A single specimen of this species was recorded from the early Valanginian of the Speeton coastal outcrop and was included as informal species Gochteodinia sp. D3E in Duxbury 2019. Further, rare specimens have been recorded in the current study including from the late Valanginian (sediments of this age are absent at Speeton). Their preservation was not as good as for the Speeton specimen, which was therefore chosen as the holotype.
Specimens of G. brevispina were observed at Vergol between Beds V97M and V124M, early Valanginian, inostranzewi Zone, platycostatus Sub-zone to late Valanginian, basal peregrinus Zone, peregrinus Sub-zone.
This small, rounded taxon displays several features similar to those observed in Gochteodinia minuta Duxbury 2023, including a low, bluntly-rounded apical termination and a finely and evenly granular surface. The horn is relatively broad and short so that the large two-plate intercalary archeopyle is "high" on the cyst of both species. Gochteodinia brevispina differs, however, in having much shorter spines. Only a single specimen of G. minuta was recorded here, from La Charce Bed 160 (late Valanginian, top peregrinus Zone), slightly older than the early Hauterivian type material from Speeton. This specimen is illustrated in pl. 8, fig. 19 for comparison.
Gochteodinia sp. D3E. – DUXBURY 2019, p. 195, pl. 20, fig. 8
Holotype: Plate 8, Figure 13.
Paratype: Plate 8 Figure 18.
Type Locality: Speeton Clay Formation, early Valanginian. Holotype: Speeton Outcrop, Slide D3E(K-2), early Valanginian,
Polyptychites ammonite Zone. E.F. K48.2. Paratype: Vergol Outcrop, Slide V124M, late Valanginian, peregrinus ammonite Zone.
E.F. V38.0.
Derivation of Name: From the Latin brevis, short and spina, thorn – in reference to the much reduced ornament of this species.
Diagnosis: A small, rotund species with a short, bluntly rounded apical horn. The entire cyst surface is finely and evenly granular and bears short, solid, distally-tapering, flat-ended processes, occasionally with a small number of very short terminal spines. Tabulation is expressed only by the archeopyle margin, which involves the displacement of two intercalary plates.
Dimensions: Holotype: Body length - 40 μm. Width - 34 μm.
Paratype Length - 35 μm. Width - 33 μm.
Overall 43 (39) 35 μm ×35 (34) 33 μm
Specimens measured - 4.
Remarks: A single specimen of this species was recorded from the early Valanginian of the Speeton coastal outcrop and was included as informal species Gochteodinia sp. D3E in Duxbury 2019. Further, rare specimens have been recorded in the current study including from the late Valanginian (sediments of this age are absent at Speeton). Their preservation was not as good as for the Speeton specimen, which was therefore chosen as the holotype.
Specimens of G. brevispina were observed at Vergol between Beds V97M and V124M, early Valanginian, inostranzewi Zone, platycostatus Sub-zone to late Valanginian, basal peregrinus Zone, peregrinus Sub-zone.
This small, rounded taxon displays several features similar to those observed in Gochteodinia minuta Duxbury 2023, including a low, bluntly-rounded apical termination and a finely and evenly granular surface. The horn is relatively broad and short so that the large two-plate intercalary archeopyle is "high" on the cyst of both species. Gochteodinia brevispina differs, however, in having much shorter spines. Only a single specimen of G. minuta was recorded here, from La Charce Bed 160 (late Valanginian, top peregrinus Zone), slightly older than the early Hauterivian type material from Speeton. This specimen is illustrated in pl. 8, fig. 19 for comparison.