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Andalusiella basita
Andalusiella basita, Slimani et al., 2012, p. 349–350, fig.6G–K.
Holotype: Slimani et al., 2012, fig.6G–I.
Type locality and bed: Ouled Haddou section, north of Taza, northern Morocco; marl 50 cm above the K/ T boundary, lower Danian.
Stratigraphic occurrence: Samples OH 1–18, planktic foraminiferal Abathomphalus mayaroensis Zone (upper Maastrichtian), Guembelitria cretacea and Parvularugoglobigerina eugubina zones (lower Danian), Ouled Haddou section.
Age: late Maastrichtian–early Danian.
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Original description: [Slimani et al., 2012]:
Diagnosis:
A small, elongate Andalusiella species with one apical and only one, undivided antapical horn. Cingulum absent.
Description:
The small, elongate, biconical, dinoflagellate cyst has a spindle-shaped appearance and is acrocavate.
The cyst bears a short apical horn and one short and undivided antapical horn (Fig. 6I, K). Both horns are of equal length.
The cyst wall consists of a thin, smooth, finely folded periphragm, which is closely appressed to a thin and smooth to slightly granulate endophragm with thickenings in the horns.
A cingulum was not observed. The archeopyle is intercalary (type I) and, in some cases, expressed by the loss of intercalary plate 2a.
The peridinioid tabulation is only indicated by the archeopyle.
Dimensions:
Holotype: central body length, 60 µm; central body width, 40 µm; apical horn length, 10 µm; antapical horn length, 10 µm.
Range: central body length, 60(72)90 µm; central body width, 30(37)40 µm; average length of apical horn, 7–12 µm; average length of antapical horn, 7–12 µm (10 specimens measured).
Remarks:
Andalusiella bacita sp. nov. resembles Andalusiella mauthei subsp. punctata (Jain & Millepied, 1973) Masure et al. 1996 in shape and the absence of a cingulum and in being acrocavate, but differs in being smaller and in having short horns and only one undivided antapical horn. Andalusiella rhomboides (Boltenhagen, 1977) Lentin & Williams, 1980 also possesses a single undivided antapical horn and lacks any indication of a cingulum, but differs distinctly by the rhomboidal central body with a verrucate wall and in being mostly cornucavate. Andalusiella dubia (Jain & Millepied, 1973) Lentin & Williams, 1980 possesses one undivided left antapical horn, but generally has a subspherical to ovoid central body and a verrucate wall. Furthermore, the latter species has a well-expressed cingulum. All other known Andalusiella species possess two antapical horns.
Holotype: Slimani et al., 2012, fig.6G–I.
Type locality and bed: Ouled Haddou section, north of Taza, northern Morocco; marl 50 cm above the K/ T boundary, lower Danian.
Stratigraphic occurrence: Samples OH 1–18, planktic foraminiferal Abathomphalus mayaroensis Zone (upper Maastrichtian), Guembelitria cretacea and Parvularugoglobigerina eugubina zones (lower Danian), Ouled Haddou section.
Age: late Maastrichtian–early Danian.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Original description: [Slimani et al., 2012]:
Diagnosis:
A small, elongate Andalusiella species with one apical and only one, undivided antapical horn. Cingulum absent.
Description:
The small, elongate, biconical, dinoflagellate cyst has a spindle-shaped appearance and is acrocavate.
The cyst bears a short apical horn and one short and undivided antapical horn (Fig. 6I, K). Both horns are of equal length.
The cyst wall consists of a thin, smooth, finely folded periphragm, which is closely appressed to a thin and smooth to slightly granulate endophragm with thickenings in the horns.
A cingulum was not observed. The archeopyle is intercalary (type I) and, in some cases, expressed by the loss of intercalary plate 2a.
The peridinioid tabulation is only indicated by the archeopyle.
Dimensions:
Holotype: central body length, 60 µm; central body width, 40 µm; apical horn length, 10 µm; antapical horn length, 10 µm.
Range: central body length, 60(72)90 µm; central body width, 30(37)40 µm; average length of apical horn, 7–12 µm; average length of antapical horn, 7–12 µm (10 specimens measured).
Remarks:
Andalusiella bacita sp. nov. resembles Andalusiella mauthei subsp. punctata (Jain & Millepied, 1973) Masure et al. 1996 in shape and the absence of a cingulum and in being acrocavate, but differs in being smaller and in having short horns and only one undivided antapical horn. Andalusiella rhomboides (Boltenhagen, 1977) Lentin & Williams, 1980 also possesses a single undivided antapical horn and lacks any indication of a cingulum, but differs distinctly by the rhomboidal central body with a verrucate wall and in being mostly cornucavate. Andalusiella dubia (Jain & Millepied, 1973) Lentin & Williams, 1980 possesses one undivided left antapical horn, but generally has a subspherical to ovoid central body and a verrucate wall. Furthermore, the latter species has a well-expressed cingulum. All other known Andalusiella species possess two antapical horns.