Back
Litosphaeridium siphoniphorum
Litosphaeridium siphoniphorum (Cookson and Eisenack, 1958, p.44, pl.11, figs.8–10) Davey and Williams, 1966b, p.80–82. Emendation: Lucas-Clark, 1984, p.186, as Litosphaeridium siphoniphorum
Originally Hystrichosphaeridium, subsequently (and now) Litosphaeridium.
Holotype: Cookson and Eisenack, 1958. pl.11, fig.8
Paratypes: Cookson and Eisenack, 1958
Locus typicus: Gingin area (Perth Basin), W Australia
Stratum typicum: Albian-Cenomanian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Litosphaeridium siphonophorum (Cookson and Eisenack, 1958) Davey and Williams, 1966b, emend. Lucas-Clark, 1984. Litosphaeridium siphonophorum has 16-17 hollow processes, three or four on the operculum. Periphragm granulate to reticulate. Endophragm finely granular and spongy. Processes bulbous, conical or subcylindrical; wide at base. Process tips truncated or constricted or slightly flared, generally thickened into a rim. Apical processes open or closed, others open Processes represent paraplates B, Ci, Cu (process not always present), 1u, 1i, 2-6, II-VI, X, Y. Size: Holotype overall diameter 76 µm, diameter of shell 43 µm, length of processes 19-24 µm.
--------------------------------------------------
Original description: Cookson and Eisenack 1958, p. 44: Hystrichosphaeridium siphoniphorum
Diagnosis: Shell spherical or slightly oval, with a rather thick, granular wall, and approximately 13 hollow conical to tube-like processes of somewhat unequal width that are open to the exterior and have a slightly recurved margin. A large pylome has been present in some examples.
Davey and Williams 1966, p. 80-82: Litosphaeridium siphoniphorum
Diagnosis: Spherical to subspherical central body composed of thin endophragm and thick reticulate periphragm. Processes, composed of smooth periphragm, varying considerably in shape and size but commonly cylindrical or sub-conical and always hollow. Distal margin of processes entire or serrate. Hexagonal apical archaeopyle usually present. Number of processes 13, rarely 14 or 15, in specimen possessing an archaeopyle. Inferred tabulation 3', 6'', 5''', 1p, 1'''' and 0-2s.
Description: The periphragm of the central body at first sight appears to be granular, but at high magnification is seen to be reticulate. The processes, though normally cylindrical or subconical, can be mammiform or even saucer-shaped (Text-fig. 17), the latter being 4-5 Ám in heigth. Very occasionally closed processes are present being either apical processes or small sulcal processes.
Emended Description: Lucas-Clarke, 1984, p. 186
Skolochorate, apiculocavate cysts with subspherical central body, and a total of 16-17 discrete, hollow processes (three to four on operculum). Periphragm ornament, which is granulate to reticulate, extends onto the processes and becomes finer toward the process tips. Endophragm ornament, which is more finely granular and 'spongy' than that on periphragm, visibly only beneath processes. Processes bulbous, conical, or subcylindrical; wide at base, covering most of the cyst body surface, but basal outline not angular. Process tips truncated or constricted or slightly flared, generally thickened into a rim. Process shafts subcircular in cross-section. Processes represent paraplates B, Ci, Cu (process not always present), 1u, 1i, 2-6, II-VI, X, Y. Processes no more than one per paraplate. Apical processes open or closed; others open. Archeopyle apical, operculum free; cingular and sulcal processes absent.
Originally Hystrichosphaeridium, subsequently (and now) Litosphaeridium.
Holotype: Cookson and Eisenack, 1958. pl.11, fig.8
Paratypes: Cookson and Eisenack, 1958
Locus typicus: Gingin area (Perth Basin), W Australia
Stratum typicum: Albian-Cenomanian
--------------------------------------------------
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Litosphaeridium siphonophorum (Cookson and Eisenack, 1958) Davey and Williams, 1966b, emend. Lucas-Clark, 1984. Litosphaeridium siphonophorum has 16-17 hollow processes, three or four on the operculum. Periphragm granulate to reticulate. Endophragm finely granular and spongy. Processes bulbous, conical or subcylindrical; wide at base. Process tips truncated or constricted or slightly flared, generally thickened into a rim. Apical processes open or closed, others open Processes represent paraplates B, Ci, Cu (process not always present), 1u, 1i, 2-6, II-VI, X, Y. Size: Holotype overall diameter 76 µm, diameter of shell 43 µm, length of processes 19-24 µm.
--------------------------------------------------
Original description: Cookson and Eisenack 1958, p. 44: Hystrichosphaeridium siphoniphorum
Diagnosis: Shell spherical or slightly oval, with a rather thick, granular wall, and approximately 13 hollow conical to tube-like processes of somewhat unequal width that are open to the exterior and have a slightly recurved margin. A large pylome has been present in some examples.
Davey and Williams 1966, p. 80-82: Litosphaeridium siphoniphorum
Diagnosis: Spherical to subspherical central body composed of thin endophragm and thick reticulate periphragm. Processes, composed of smooth periphragm, varying considerably in shape and size but commonly cylindrical or sub-conical and always hollow. Distal margin of processes entire or serrate. Hexagonal apical archaeopyle usually present. Number of processes 13, rarely 14 or 15, in specimen possessing an archaeopyle. Inferred tabulation 3', 6'', 5''', 1p, 1'''' and 0-2s.
Description: The periphragm of the central body at first sight appears to be granular, but at high magnification is seen to be reticulate. The processes, though normally cylindrical or subconical, can be mammiform or even saucer-shaped (Text-fig. 17), the latter being 4-5 Ám in heigth. Very occasionally closed processes are present being either apical processes or small sulcal processes.
Emended Description: Lucas-Clarke, 1984, p. 186
Skolochorate, apiculocavate cysts with subspherical central body, and a total of 16-17 discrete, hollow processes (three to four on operculum). Periphragm ornament, which is granulate to reticulate, extends onto the processes and becomes finer toward the process tips. Endophragm ornament, which is more finely granular and 'spongy' than that on periphragm, visibly only beneath processes. Processes bulbous, conical, or subcylindrical; wide at base, covering most of the cyst body surface, but basal outline not angular. Process tips truncated or constricted or slightly flared, generally thickened into a rim. Process shafts subcircular in cross-section. Processes represent paraplates B, Ci, Cu (process not always present), 1u, 1i, 2-6, II-VI, X, Y. Processes no more than one per paraplate. Apical processes open or closed; others open. Archeopyle apical, operculum free; cingular and sulcal processes absent.