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Lanterna reticulata
(Plate V, 1–12)
Holotype: Plate V, 5, 6.
Diagnosis: A species of Lanternawith an autophragmcovered by a reticulate to pseudo-reticulate ornament, divided by smooth pandasutural bands. Tabulation gonyaulacacean, archeopyle apical, Type (tA), operculum free.
Etymology: ‘reticulata' in reference to the reticulate nature of the autophragm (periphragm).
Material: Palynological strew samples; 2842 m Io-1; 2878 m, 2877 m, Jansz-1; 2811 m, Jansz-3.
Age: Oxfordian (W. spectabilis Zone; Fig. 5).
Lithostratigraphic occurrence: The Frigate and lower Vulcan fms of the Bonaparte Basin. The Dingo Claystone, Jansz Sandstone and Eliassen Fm of the Northern Carnarvon Basin.
Description: A small to intermediate-sized, proximate dinoflagellate cyst with a spherical to subspherical ambitus. The autophragm is characterised by reticulate intratabular ornament, with lumina typically 0.5–4 μm in diameter and of uniform size across individual specimens. Very rarely pseudoreticulate ornament is created by discontinuous anastomosing ridges. Intratabular ornamentatation is separated by smooth, unadorned pandasutural bands., 0.5–2 μm wide. Cingulum strongly laevorotatory;weakly expressed sulcal notch; sulcal plates not expressed, overlying a distinctive flagellar scar. Tabulation gonyaulacacean of formula:? pr, 4′, 1a, 6″, 6c, 6″’, 1p, 1″”,?5–6 s; archeopyle apical, Type (tA).
Dimensions: (48 specimens measured)
Length (with operculum): 50 (56) 60
Length (without operculum): 42 (50) 59
Width: 41 (49) 61
Mean diameter of lumina: 0.5 (2) 4
Comparison and remarks: Lanterna reticulata differs from all other species of Lanterna in having a reticulate autophragm. Morphotypes with a fine reticulum resemble Lanterna foveolata but differ in having a more uniform reticulum and more pronounced pandasutural bands, that more completely indicates the tabulation. The nature of the reticulum is variable, ranging from fine to coarse, more rarely, imperfect (i.e., pseudo-reticulum).
Holotype: Plate V, 5, 6.
Diagnosis: A species of Lanternawith an autophragmcovered by a reticulate to pseudo-reticulate ornament, divided by smooth pandasutural bands. Tabulation gonyaulacacean, archeopyle apical, Type (tA), operculum free.
Etymology: ‘reticulata' in reference to the reticulate nature of the autophragm (periphragm).
Material: Palynological strew samples; 2842 m Io-1; 2878 m, 2877 m, Jansz-1; 2811 m, Jansz-3.
Age: Oxfordian (W. spectabilis Zone; Fig. 5).
Lithostratigraphic occurrence: The Frigate and lower Vulcan fms of the Bonaparte Basin. The Dingo Claystone, Jansz Sandstone and Eliassen Fm of the Northern Carnarvon Basin.
Description: A small to intermediate-sized, proximate dinoflagellate cyst with a spherical to subspherical ambitus. The autophragm is characterised by reticulate intratabular ornament, with lumina typically 0.5–4 μm in diameter and of uniform size across individual specimens. Very rarely pseudoreticulate ornament is created by discontinuous anastomosing ridges. Intratabular ornamentatation is separated by smooth, unadorned pandasutural bands., 0.5–2 μm wide. Cingulum strongly laevorotatory;weakly expressed sulcal notch; sulcal plates not expressed, overlying a distinctive flagellar scar. Tabulation gonyaulacacean of formula:? pr, 4′, 1a, 6″, 6c, 6″’, 1p, 1″”,?5–6 s; archeopyle apical, Type (tA).
Dimensions: (48 specimens measured)
Length (with operculum): 50 (56) 60
Length (without operculum): 42 (50) 59
Width: 41 (49) 61
Mean diameter of lumina: 0.5 (2) 4
Comparison and remarks: Lanterna reticulata differs from all other species of Lanterna in having a reticulate autophragm. Morphotypes with a fine reticulum resemble Lanterna foveolata but differ in having a more uniform reticulum and more pronounced pandasutural bands, that more completely indicates the tabulation. The nature of the reticulum is variable, ranging from fine to coarse, more rarely, imperfect (i.e., pseudo-reticulum).