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Brigantedinium irregulare
From Fensome et al., 2019:
Brigantedinium irregulare Matsuoka, 1987, p.56–57, pl.5, figs.13–16; text-fig.4C ex Head, 1996b, p.1231. Holotype: Matsuoka,
1987, pl.5, figs.15–16. Motile equivalent: Protoperidinium denticulatum (Gran and Braarud 1935) Balech, 1974,
according to Matsuoka (1987, p.57). This name was not validly published in Matsuoka (1987, p.56–57) since the
generic name Brigantedinium was not validly published at that time. Age: Holocene.
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Original description: [Matsuoka, 1987]:
Brigantedinium irregulare sp. nov.
Plate 5, figures 13-16 ; Text-fig. 4C
1976b Peridinium sp. cf. P.? denticulatum Gran and Braarud ; Matsuoka, p. 359, pl. Ill, fig.10.
1983 Empty resting cyst of Protoperidinium denticulatum (Gran & Braarud) Balech ; Dale, Fig. 21.
Derivation of name : Latin irregulare, irregular, with reference to its irregularly hexagonal intercalary archeopyle.
Diagnosis : Small spherical cyst brownish-pigmented, and consisting of smooth autophragm. Except for archeopyle, neither ornament nor structure representing paratabulation. Archeopyle simple intercalary, irregularly hexagonal in shape ; consisting two long sides which are slightly curved, three intermediate sides and one short side.
Testa quae est globularis, parva vel intermedia in magmtudine et brunnea in colore consistit ex levi autophragmate. Archeopyla excepta neque ornamentum neque structura repraesentat paratabulationem. Archeopyla quae est simplex, anterior, intercalaris et inusitate hexagonalis habet duo longa et flexa, tria intermedia latera et unum breve latus.
Holotype : Slide no. Ak2-2 (85.5/31.7), PL 5, figs. 15-16, sample no. AK2, Recent sediment in Akkeshi Bay, Hokkaido, North Japan.
Dimensions : Cyst diameter 36.0-42.8 μm (Holotype 40.0 μm).
Number of specimens observed : 15.
Remarks : This cyst closely resembles Brigantedinium cariacoense (Wall) and B. asymmetricum in possessing a hexagonal intercalary archeopyle. But this species differs from B. asymmetricum in bearing two long principal archeopyle sutures and from B. cariacoense in carrying one very short principal archeopyle suture, of which character has been pointed out by Dale (1983).
Geographical destribution in previous record : Off Monhegan Island, U.S.A. by Dale (1983).
Equivalent thecate form : Protoperidinium denticulatum (Gran & Braarud) Balech reported by Dale (1983).
Brigantedinium irregulare Matsuoka, 1987, p.56–57, pl.5, figs.13–16; text-fig.4C ex Head, 1996b, p.1231. Holotype: Matsuoka,
1987, pl.5, figs.15–16. Motile equivalent: Protoperidinium denticulatum (Gran and Braarud 1935) Balech, 1974,
according to Matsuoka (1987, p.57). This name was not validly published in Matsuoka (1987, p.56–57) since the
generic name Brigantedinium was not validly published at that time. Age: Holocene.
---------------------------------------------------------------------------------------------------
Original description: [Matsuoka, 1987]:
Brigantedinium irregulare sp. nov.
Plate 5, figures 13-16 ; Text-fig. 4C
1976b Peridinium sp. cf. P.? denticulatum Gran and Braarud ; Matsuoka, p. 359, pl. Ill, fig.10.
1983 Empty resting cyst of Protoperidinium denticulatum (Gran & Braarud) Balech ; Dale, Fig. 21.
Derivation of name : Latin irregulare, irregular, with reference to its irregularly hexagonal intercalary archeopyle.
Diagnosis : Small spherical cyst brownish-pigmented, and consisting of smooth autophragm. Except for archeopyle, neither ornament nor structure representing paratabulation. Archeopyle simple intercalary, irregularly hexagonal in shape ; consisting two long sides which are slightly curved, three intermediate sides and one short side.
Testa quae est globularis, parva vel intermedia in magmtudine et brunnea in colore consistit ex levi autophragmate. Archeopyla excepta neque ornamentum neque structura repraesentat paratabulationem. Archeopyla quae est simplex, anterior, intercalaris et inusitate hexagonalis habet duo longa et flexa, tria intermedia latera et unum breve latus.
Holotype : Slide no. Ak2-2 (85.5/31.7), PL 5, figs. 15-16, sample no. AK2, Recent sediment in Akkeshi Bay, Hokkaido, North Japan.
Dimensions : Cyst diameter 36.0-42.8 μm (Holotype 40.0 μm).
Number of specimens observed : 15.
Remarks : This cyst closely resembles Brigantedinium cariacoense (Wall) and B. asymmetricum in possessing a hexagonal intercalary archeopyle. But this species differs from B. asymmetricum in bearing two long principal archeopyle sutures and from B. cariacoense in carrying one very short principal archeopyle suture, of which character has been pointed out by Dale (1983).
Geographical destribution in previous record : Off Monhegan Island, U.S.A. by Dale (1983).
Equivalent thecate form : Protoperidinium denticulatum (Gran & Braarud) Balech reported by Dale (1983).