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Fibrocysta axialis
Fibrocysta axialis (Eisenack, 1965) Stover and Evitt, 1978
Originally Cordosphaeridium, subsequently Lanternosphaeridium, thirdly Amphorosphaeridium, fourthly (and now) Fibrocysta.
Holotype: Eisenack, 1965, pl. 15, fig. 2
Stratum typicum: Late Eocene-Early Oligocene
Locus typicus: Palmnicken, Samland, E Prussia
Translation Eisenack, 1965: LPP
Original description: Eisenack, 1965, p. 150: Cordosphaeridium axiale
Diagnosis: Central shell oval, with axial-symmetrically arranged, relatively long and thin processes. The latter extend from the fibres of a very delicate outer layer, are broadened at their bases, and split distally, more or less irregularly and brush-like, into 3 or more tips bent-apart. The apical pole is marked by a substantially broader and often longer process, which is mostly more deeply
branched than the other processes. The pylome is situated subapically, has a rounded horseshoe shape, and extends onto the equator.
Dimensions: holotype: shell 57x71 Ám, total 104x116 Ám. Shell dimensions between 58x62 an 67x78 Ám, the total dimensions between 103x123 and 114x135 Ám.
Morgenroth, 1966, p. 38: Lanternosphaeridium axiale
Diagnosis: A Lanternosphaeridium species with a smooth shell. Apical horn strong, massive, distally splitting into several thick stumps. Numerous slender, massive processes, incidentally branching distally. Occasional "rootnetwork" at the process-bases indicates a very thin, fibrous outer layer of the shell-wall.
Description: The ovoidal shell has a smooth surface. From it, numerous slender, massive processes extend, which generally widen distally, branching incidentally. Apart from the length, the processes are extremely uniform. At the base of the processes of some specimens, there is an indication of a "rootnetwork", which indicates rudimentary, fibrous outer layer of the shell wall. A strong, massive process rises over the apical horn, widening distally and splitting into several thick stubs. The antapex is marked by a massive, pointed process. The shell generally reaches into both polar processes with small bulges. Directly below the apical pole, all specimens show a stretched-trapezoid pylome, the corners of which are rounded.
Supplemental description: Hultberg, 1985, p. 122-123
Chorate cyst, composed of endophragm and periphragm, appressed between processes. The surface of the endophragm is smooth. The surface of the periphragm is fibrous. The shape of the cyst is ellipsoidal, with one apical and one antapical projection. Paratabulation is expressed by intratabular process-groups. The processes are solid, fibrous, and distally expanded. The paratabulation is gonyaulacacean, paratabulation formula: 4', 6'', xc, 6''', 1''''. The archeopyle is precingular, type P, formed by the detachment of paraplate 3''. Operculum free.
Paracingulum is indicated by small, flattened processes. Parasulcus is indicated by two to five small processes, probably reflecting the individual paraplates.
Size: 115-136Ám (length), 106-120 Ám (breadth).
Affinities.
Eisenack, 1965, p. 150: Cordosphaeridium axiale
The fibrous character of the processes is similar to, but less well developed than that in Cordosphaeridium inodes ssp. gracilis. The processes in C. axiale seem more homogenous, but the fibrous structure at the bases is clear. The outer layer is clearest at the base of the apical process.
Morgenroth, 1966, p. 39: Lanternosphaeridium axialis
Lanternosphaeridium axialis differs from L. lanosum and L. radiatum in the type of processes and the characteristic apical horn. It differs from Coronifera species in the "rootnetwork" at the bases of the processes.
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Fibrocysta axialis (Eisenack, 1965b) Stover and Evitt, 1978, has a fibrous periphragm and numerous slender, uniform, solid processes which are distally expanded. There is a large, distally branched apical process. The antapical process is large and pointed. The paracingulum is indicated by short, flattened processes. Size: length 58 x 62 and 67 x 78 µm. Overall 105 x 123 and 114 x 135 µm.
Originally Cordosphaeridium, subsequently Lanternosphaeridium, thirdly Amphorosphaeridium, fourthly (and now) Fibrocysta.
Holotype: Eisenack, 1965, pl. 15, fig. 2
Stratum typicum: Late Eocene-Early Oligocene
Locus typicus: Palmnicken, Samland, E Prussia
Translation Eisenack, 1965: LPP
Original description: Eisenack, 1965, p. 150: Cordosphaeridium axiale
Diagnosis: Central shell oval, with axial-symmetrically arranged, relatively long and thin processes. The latter extend from the fibres of a very delicate outer layer, are broadened at their bases, and split distally, more or less irregularly and brush-like, into 3 or more tips bent-apart. The apical pole is marked by a substantially broader and often longer process, which is mostly more deeply
branched than the other processes. The pylome is situated subapically, has a rounded horseshoe shape, and extends onto the equator.
Dimensions: holotype: shell 57x71 Ám, total 104x116 Ám. Shell dimensions between 58x62 an 67x78 Ám, the total dimensions between 103x123 and 114x135 Ám.
Morgenroth, 1966, p. 38: Lanternosphaeridium axiale
Diagnosis: A Lanternosphaeridium species with a smooth shell. Apical horn strong, massive, distally splitting into several thick stumps. Numerous slender, massive processes, incidentally branching distally. Occasional "rootnetwork" at the process-bases indicates a very thin, fibrous outer layer of the shell-wall.
Description: The ovoidal shell has a smooth surface. From it, numerous slender, massive processes extend, which generally widen distally, branching incidentally. Apart from the length, the processes are extremely uniform. At the base of the processes of some specimens, there is an indication of a "rootnetwork", which indicates rudimentary, fibrous outer layer of the shell wall. A strong, massive process rises over the apical horn, widening distally and splitting into several thick stubs. The antapex is marked by a massive, pointed process. The shell generally reaches into both polar processes with small bulges. Directly below the apical pole, all specimens show a stretched-trapezoid pylome, the corners of which are rounded.
Supplemental description: Hultberg, 1985, p. 122-123
Chorate cyst, composed of endophragm and periphragm, appressed between processes. The surface of the endophragm is smooth. The surface of the periphragm is fibrous. The shape of the cyst is ellipsoidal, with one apical and one antapical projection. Paratabulation is expressed by intratabular process-groups. The processes are solid, fibrous, and distally expanded. The paratabulation is gonyaulacacean, paratabulation formula: 4', 6'', xc, 6''', 1''''. The archeopyle is precingular, type P, formed by the detachment of paraplate 3''. Operculum free.
Paracingulum is indicated by small, flattened processes. Parasulcus is indicated by two to five small processes, probably reflecting the individual paraplates.
Size: 115-136Ám (length), 106-120 Ám (breadth).
Affinities.
Eisenack, 1965, p. 150: Cordosphaeridium axiale
The fibrous character of the processes is similar to, but less well developed than that in Cordosphaeridium inodes ssp. gracilis. The processes in C. axiale seem more homogenous, but the fibrous structure at the bases is clear. The outer layer is clearest at the base of the apical process.
Morgenroth, 1966, p. 39: Lanternosphaeridium axialis
Lanternosphaeridium axialis differs from L. lanosum and L. radiatum in the type of processes and the characteristic apical horn. It differs from Coronifera species in the "rootnetwork" at the bases of the processes.
G.L. Williams short notes on species, Mesozoic-Cenozoic dinocyst course, Urbino, Italy, May 17-22, 1999 - LPP VIEWER CD-ROM 99.5.
Fibrocysta axialis (Eisenack, 1965b) Stover and Evitt, 1978, has a fibrous periphragm and numerous slender, uniform, solid processes which are distally expanded. There is a large, distally branched apical process. The antapical process is large and pointed. The paracingulum is indicated by short, flattened processes. Size: length 58 x 62 and 67 x 78 µm. Overall 105 x 123 and 114 x 135 µm.