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Batioladinium vexillum
From Fensome et al., 2019:
Batioladinium vexillum (Duxbury, 1977, p.53–54, pl.14, figs.6–7; text-figs.20a–b) Davey, 1982b, p.22. Holotype:
Duxbury, 1977, pl.14, fig.6; text-fig.20b; Pourtoy, 1988, pl.2, figs.1–2. Originally Aprobolocysta, subsequently
Batioladinium, thirdly Aprobolocysta?. Taxonomic senior synonym: Broomea (as Necrobroomea) gochtii,
according to Below (1990, p.53). Age: early Valanginian–early Hauterivian.
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Original description Duxbury, 2018:
Plate 9, figures 4–6
Holotype: Plate 9, Figure 5.
Paratype: Plate 9, Figure 6.
Type Locality: Well 20/01-8Z at 7378.00 ft (conventional core chip), lower Valanginian. Holotype: E.F E54.0. Paratype: U44.1
Derivation of Name: From the Latin vexillum, banner, flag – in reference to the distinctive structure of the left antapical horn.
Diagnosis: A large, elongate pareodinioid dinocyst with a very long, gradually-tapering apical horn and two very unequal antapical horns. The left antapical horn is fairly long and carries distally an irregular, sometimes ragged, flat structure which develops mainly to the left of the horn axis. A shorter, simple, solid right antapical horn may be present but is often lost. The archeopyle is apical with the operculum usually only partially detached. A deep sulcal notch typical of the genus is invariably present. The surface ornament is granular to irregularly vermiculate and of varying height, restricted to the hypocyst and cingular area, with ornament density increasing towards the antapex; alignment of surface ornament can outline the cingulum. The epicyst is smooth.
Dimensions: Holotype: Length – 185 μm. Width – 38 μm.
Overall: Complete specimens: 185 (174) 152μm × 38 (36) 33 μm.
Specimens Measured: 5
Remarks: This is a distinctive, very short-lived species, occurring within the lower Valanginian. The FAD is associated with Pareodinia magna n. sp. and rare Gochteodinia parvispina n. sp., and it ranges slightly higher than both of these species (Figure 10).
Batioladinium vexillum n. sp. most closely resembles Batioladinium principium n. sp. and Batioladinium longicornutum, and it may be an intermediate form, sharing features with both. It differs from B. principium n. sp. in posessing well-developed antapical horns, although the body ornament is similar in type and distribution, and from B. longicornutum in possessing body ornament and in the antapical horn structure. Batioladinium longicornutum is completely smooth (Harding 1980, p. 46) and the antapical horns, although well-developed, are of approximately equal length; although these can carry ragged ornament, they lack the distinctive flag-like embelishment which is present on the left antapical horn of B. vexillum.
Batioladinium vexillum (Duxbury, 1977, p.53–54, pl.14, figs.6–7; text-figs.20a–b) Davey, 1982b, p.22. Holotype:
Duxbury, 1977, pl.14, fig.6; text-fig.20b; Pourtoy, 1988, pl.2, figs.1–2. Originally Aprobolocysta, subsequently
Batioladinium, thirdly Aprobolocysta?. Taxonomic senior synonym: Broomea (as Necrobroomea) gochtii,
according to Below (1990, p.53). Age: early Valanginian–early Hauterivian.
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Original description Duxbury, 2018:
Plate 9, figures 4–6
Holotype: Plate 9, Figure 5.
Paratype: Plate 9, Figure 6.
Type Locality: Well 20/01-8Z at 7378.00 ft (conventional core chip), lower Valanginian. Holotype: E.F E54.0. Paratype: U44.1
Derivation of Name: From the Latin vexillum, banner, flag – in reference to the distinctive structure of the left antapical horn.
Diagnosis: A large, elongate pareodinioid dinocyst with a very long, gradually-tapering apical horn and two very unequal antapical horns. The left antapical horn is fairly long and carries distally an irregular, sometimes ragged, flat structure which develops mainly to the left of the horn axis. A shorter, simple, solid right antapical horn may be present but is often lost. The archeopyle is apical with the operculum usually only partially detached. A deep sulcal notch typical of the genus is invariably present. The surface ornament is granular to irregularly vermiculate and of varying height, restricted to the hypocyst and cingular area, with ornament density increasing towards the antapex; alignment of surface ornament can outline the cingulum. The epicyst is smooth.
Dimensions: Holotype: Length – 185 μm. Width – 38 μm.
Overall: Complete specimens: 185 (174) 152μm × 38 (36) 33 μm.
Specimens Measured: 5
Remarks: This is a distinctive, very short-lived species, occurring within the lower Valanginian. The FAD is associated with Pareodinia magna n. sp. and rare Gochteodinia parvispina n. sp., and it ranges slightly higher than both of these species (Figure 10).
Batioladinium vexillum n. sp. most closely resembles Batioladinium principium n. sp. and Batioladinium longicornutum, and it may be an intermediate form, sharing features with both. It differs from B. principium n. sp. in posessing well-developed antapical horns, although the body ornament is similar in type and distribution, and from B. longicornutum in possessing body ornament and in the antapical horn structure. Batioladinium longicornutum is completely smooth (Harding 1980, p. 46) and the antapical horns, although well-developed, are of approximately equal length; although these can carry ragged ornament, they lack the distinctive flag-like embelishment which is present on the left antapical horn of B. vexillum.