Back
Glaphyrocysta circularis
Glaphyrocysta circularis Matsuoka, 1984a, p.378, pl.71, figs.2a-b,3,4a-b,5.
Holotype: Matsuoka, 1984a, pl.71, fig.2a-b; Fauconnier and Masure, 2004, pl.32, fig.2.
Age: Mid Eocene.
Original description (Matsuoka, 1984a)
Derivation of name: Latin, circulus (dim. circus), a ring; with reference to the circular trabecurae in distal margin of annulate complexes.
Diagnosis: Intermediate skolochorate cyst subcircular to elliptical in dorso-ventral view, and occasionally having a small antapical boss. Processes mostly solid and slender, and occuring as annulate, soliate or linear complexes except for a few paraplate areas. Each complex mostly consistng of five to seven processes. Distal part of processes furcated and united by slender and flexous trabeculae with smooth surface and short spines. Archeopyle apical, tetratabular.
Holotype: Slide NG 39-5 (4xI), Pl. 71, Fig. 2. Sample no. NG 39, Nanggulan Formation, Middle Eocene. Location; Kalisngo near Naggulan, 20 km northwest of Yogjakarta, Central Java, Indonesia.
Dimensions: Holotype; cyst diameter 67.2 µm, length of processes 20.2 µm. Other specimens; cyst diameter 37-68µm, length of processes 13-21 µm. Number of specimens measured: 5.
Description: The cyst body consisting of a thin autophragm is lenticular and bears occasionally a small antapical boss. The existence of an apical boss is unknown, because any complete specimen was not encountered. The surface of cyst shows a coarse granulate to reticulate feature. Processes are solid and slender, and occur as annular, soliate and/or linear complexes. Most paraplate areas possesses an annular or soliate complexes made up of five to seven flexous and slender processes, but the 3" paraplate is represented as a linear complex consisting of three slener processes. The 6", 1"' and 6"' paraplates are often devoided of any process, but rarely are reflected by simple process much reduced. The antapical 1"" complex comprises about then slender processes.The distal extremities of processes are furcate and united by a simple slender but flexous trabeculae with short spines or rarely weakly denticulate margin. Two peripheral process groups are conspicuously developed. They are made up of the 1", 2" and 2"' complexes, and 4" and 4"' complexes which joint distally with somewhat larger trabeculae. Other process complexes are soliate. The cingular and sulcal areas are lacking in any process-like ornamentation. The archeopyle is an apical type with seven princeple archeopyle sutures. The paratabulation is indicated by the complexes and the apical archeopyle; 4'(?), 0a, 6", 0c, as, 6"'. 0p. 1"".
Remarks: This species resembles Glaphyrocysta intricata (Eaton) Stover and Evitt, G. retiintexta (Cookson) Stover and Evitt, and ?G. reticulosa (Gerlach) Stover and Evitt in having simple processes. G. circularis sp. nov., however, is distinguishable from G. retiintexta (Cookson) and G. intricata (Eaton) in constantly possessing the 3" linear complex and only one antapical boss.
Holotype: Matsuoka, 1984a, pl.71, fig.2a-b; Fauconnier and Masure, 2004, pl.32, fig.2.
Age: Mid Eocene.
Original description (Matsuoka, 1984a)
Derivation of name: Latin, circulus (dim. circus), a ring; with reference to the circular trabecurae in distal margin of annulate complexes.
Diagnosis: Intermediate skolochorate cyst subcircular to elliptical in dorso-ventral view, and occasionally having a small antapical boss. Processes mostly solid and slender, and occuring as annulate, soliate or linear complexes except for a few paraplate areas. Each complex mostly consistng of five to seven processes. Distal part of processes furcated and united by slender and flexous trabeculae with smooth surface and short spines. Archeopyle apical, tetratabular.
Holotype: Slide NG 39-5 (4xI), Pl. 71, Fig. 2. Sample no. NG 39, Nanggulan Formation, Middle Eocene. Location; Kalisngo near Naggulan, 20 km northwest of Yogjakarta, Central Java, Indonesia.
Dimensions: Holotype; cyst diameter 67.2 µm, length of processes 20.2 µm. Other specimens; cyst diameter 37-68µm, length of processes 13-21 µm. Number of specimens measured: 5.
Description: The cyst body consisting of a thin autophragm is lenticular and bears occasionally a small antapical boss. The existence of an apical boss is unknown, because any complete specimen was not encountered. The surface of cyst shows a coarse granulate to reticulate feature. Processes are solid and slender, and occur as annular, soliate and/or linear complexes. Most paraplate areas possesses an annular or soliate complexes made up of five to seven flexous and slender processes, but the 3" paraplate is represented as a linear complex consisting of three slener processes. The 6", 1"' and 6"' paraplates are often devoided of any process, but rarely are reflected by simple process much reduced. The antapical 1"" complex comprises about then slender processes.The distal extremities of processes are furcate and united by a simple slender but flexous trabeculae with short spines or rarely weakly denticulate margin. Two peripheral process groups are conspicuously developed. They are made up of the 1", 2" and 2"' complexes, and 4" and 4"' complexes which joint distally with somewhat larger trabeculae. Other process complexes are soliate. The cingular and sulcal areas are lacking in any process-like ornamentation. The archeopyle is an apical type with seven princeple archeopyle sutures. The paratabulation is indicated by the complexes and the apical archeopyle; 4'(?), 0a, 6", 0c, as, 6"'. 0p. 1"".
Remarks: This species resembles Glaphyrocysta intricata (Eaton) Stover and Evitt, G. retiintexta (Cookson) Stover and Evitt, and ?G. reticulosa (Gerlach) Stover and Evitt in having simple processes. G. circularis sp. nov., however, is distinguishable from G. retiintexta (Cookson) and G. intricata (Eaton) in constantly possessing the 3" linear complex and only one antapical boss.