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Tanyosphaeridium hirsutum
Plate 12, Figures 7-9, 13
Holotype: Plate 12, Figure 13
Paratype: Plate 12, Figure 7
Type Locality: Vergol outcrop, late Valanginian, Bed B101M, verrucosum ammonite Zone, verrucosum Sub-zone.
Holotype: Vergol Bed B131M, late Berriasian, alpillensis Zone, otopeta Sub-zone, Slide B131M(R1), E.F. W42.1. Paratype:
Vergol Bed V101M, Slide V101M(schulze), E.F. R51.3.
Derivation of Name: From the Latin hirsutus, hairy - in reference to the numerous processes of this species.
Diagnosis: A fairly large, elongate ellipsoidal species with the main body approximately twice as long as broad. The poles are rounded with the apical pole notably broader than the antapical. A finely granular ornament covers the cyst surface and numerous (often >100) slender, tubular processes are present which are distally open; processes typically approximate to half the main body width or more. Process length is largely consistent on individual specimens but can be shorter at the poles. The presumed tetratabular apical archeopyle is relatively small and the operculum often remains attached.
Dimensions: Holotype Main body 86 × 38 μm. Overall - 101 × 63 μm.
Paratype Main body 71 × 30 μm. Overall - 76 × 46 μm.
All specimens - Main body 86 (61) 53 μm × 38 (34) 28 μm.
Overall 101 (76) 63 μm × 63 (53) 43 μm.
Specimens measured – 10 (5 complete and 5 with the operculum detached).
Remarks: This relatively large, elongate form with very numerous, slender processes is restricted here to individuals bearing tubular processes with open terminations. Processes are slender and tend either not to flare distally or to flare slightly. The cyst outline is elongate ellipsoidal and in particularly elongated specimens the central part of the cyst can be parallel-sided. Tanyosphaeridium hirsutum is similar in many features to Prolixosphaeridium prolatum Duxbury n. sp., although somewhat smaller, and this is further discussed under that species, above.
This species was common as old as Bed B151M (early Valanginian, pertransiens Zone, premolicus Sub-zone) and ranged up to Bed V111 (late Valanginian, verrucosum Zone, base verrucosum Sub-zone).
Holotype: Plate 12, Figure 13
Paratype: Plate 12, Figure 7
Type Locality: Vergol outcrop, late Valanginian, Bed B101M, verrucosum ammonite Zone, verrucosum Sub-zone.
Holotype: Vergol Bed B131M, late Berriasian, alpillensis Zone, otopeta Sub-zone, Slide B131M(R1), E.F. W42.1. Paratype:
Vergol Bed V101M, Slide V101M(schulze), E.F. R51.3.
Derivation of Name: From the Latin hirsutus, hairy - in reference to the numerous processes of this species.
Diagnosis: A fairly large, elongate ellipsoidal species with the main body approximately twice as long as broad. The poles are rounded with the apical pole notably broader than the antapical. A finely granular ornament covers the cyst surface and numerous (often >100) slender, tubular processes are present which are distally open; processes typically approximate to half the main body width or more. Process length is largely consistent on individual specimens but can be shorter at the poles. The presumed tetratabular apical archeopyle is relatively small and the operculum often remains attached.
Dimensions: Holotype Main body 86 × 38 μm. Overall - 101 × 63 μm.
Paratype Main body 71 × 30 μm. Overall - 76 × 46 μm.
All specimens - Main body 86 (61) 53 μm × 38 (34) 28 μm.
Overall 101 (76) 63 μm × 63 (53) 43 μm.
Specimens measured – 10 (5 complete and 5 with the operculum detached).
Remarks: This relatively large, elongate form with very numerous, slender processes is restricted here to individuals bearing tubular processes with open terminations. Processes are slender and tend either not to flare distally or to flare slightly. The cyst outline is elongate ellipsoidal and in particularly elongated specimens the central part of the cyst can be parallel-sided. Tanyosphaeridium hirsutum is similar in many features to Prolixosphaeridium prolatum Duxbury n. sp., although somewhat smaller, and this is further discussed under that species, above.
This species was common as old as Bed B151M (early Valanginian, pertransiens Zone, premolicus Sub-zone) and ranged up to Bed V111 (late Valanginian, verrucosum Zone, base verrucosum Sub-zone).