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Hystrichosphaeropsis quasicribrata
Hystrichosphaeropsis quasicribrata (O.Wetzel, 1961) Gocht 1976
Originally Triblastula, subsequently (and now) Hystrichosphaeropsis.
Tax. sr. synonym of Amphidiadema rectangularis ssp. samuelsonii (Kjellstr÷m, 1973) Lentin and Williams, 1976, according to Gocht, 1976.
Questionable tax. sr. synonym of Triblastula nuda 0. Wetzel, 1961, according to Gocht, 1976.
Questionable tax. sr. synonym of Triblastula tubulata 0. Wetzel, 1961, according to Gocht, 1976. Stover and Evitt, 1978, concurred with Gocht"s opinion. Marheinecke, 1992, accepted all the synonymies without comment.
Tax. sr. synonym of Amphidiadema rectangularis (Cookson and Eisenack, 1962) Lentin and Williams, 1976, according to Stover and Evitt, 1978, who were following Gocht, 1976. However, Gocht, 1976, only considered the specimen of Amphidiadema rectangularis illustrated by Kjellstr÷m, 1973, to be synonymous.
Holotype: O.Wetzel, 1961, pl. 2, fig. 3; Sarjeant, 1985, pl. 2, fig. 1; Jan du Chene et al., 1986, fig. 46, fig. 9-10
Locus typicus: Baltic Cretaceous flintstones
Stratum typicum: Erratic, ?Late Cretaceous
Translation Gocht, 1976: LPP
Original description: O.Wetzel, 1961, p. 340: Triblastula quasicribrata
Diagnosis: Central body spheroidal and spineless. Both "caps" are cylindrical- cuboidal, narrower toward the ends, especially the one ("epitheca") having a more projecting field of pore-meshes with terminal edges protruding. "Pylomes" are common.
Dimensions: c. 100 x 50 Ám.
Extended diagnosis: Gocht, 1976, p. 322-323
Outer shell delicate, elongate pillar-shaped. Apical part bluntly flattened, with short, coronet-shaped tip. Antapex flat or slightly rounded. In the region of the girdle, the outer shell is constricted and appressed to the iiner body.
Girdle fields diamond-shaped to polygonal. Thus, an alternating arrangement of the elongate, 5-6 sided fields of the pre- and postcingular series. Ventral apical fields (1", 4") elongate, dorsals (2", 3") broadly quadrangular. Antapical field trapezoidal. Behind 1""" the accessory field 1p. Between the girdle ends small sulcal fields may be visible.
Field margins expressed very diversely: longitudinal field-margins generally well-developed, at the pre- and postcingulars folded into sharp margins, partly also stiffened into strong edges, which terminate at the girdle. Between these ends arch-shaped lines run around the equator, indicating the zone of contact between outer and inner shell. Field margins of the ventral region and the apex as thin or intermediately strong edges. Longitudinal margins of the girdle-fields in the form of strong projections or bulges (often absent between 3c and 4c). Other girdle-margins, sometimes also the margins of the sulcal fields, delicate and fine as a hair. Formula of the reflected tabulatio: 4", 6"", 6c, 5""", 1p, 1""""; ns. Surface of the outer shell smooth, sometimes finely granulate.
Inner body of only minor firmness, broadly oval to al,ost spherical. Preccingular archaeopyle (3""). In the antapical field often a regularly formed opening.
Dimensions: Holotype length 97 Ám, width 51 Ám; inner shell 43:43 Ám. Other specimens length 82-110 Ám, width 44-57 Ám; diameter 97 Ám (L), 51 Ám (W). 35 specimens.
Supplemental description: Hultberg, 1985, p. 134-135
Bicavate to circumcavate cyst, composed of endophragm and periphragm, separated by pericoels, except at the equatorial part of the cyst. The surface of the endophragm is granulate. The surface of the periphragm is smooth. The shape of the endophragm is ovoidal. The periphragm is slightly rectangular in outline, with a low, pyramidal apical protrusion. Paratabulation is incompletely expressed by folds in the periphragm. The paratabulation probably follows the standard gonyaulacacean paratabulation formula. The archeopyle is precingular, type P, forme1 by the detachment of paraplate 3"". Operculum free. Paracingulum is indicated by thin folds in the periphragm. Parasulcus is not indicated.
Size - 68-80Ám (length), 37-60Ám (breadth).
Afinities:
O. Wetzel, 1961, p. 340: Comment: Amphidiadema denticulata Cookson and Eisenack (1960) appears closely similar to this species of Triblastula, but it differs in the terminal portions, which are smaller and more open but not "quasicribrate" (i.e., perforated like a sieve). The authors themselves regarded their new species as closely related to another of their new forms, Deflandrea tripartita Cookson and Eisenack (1960) (see my remarks under Bulbodinium O.Wetzel, 1960, below).
Originally Triblastula, subsequently (and now) Hystrichosphaeropsis.
Tax. sr. synonym of Amphidiadema rectangularis ssp. samuelsonii (Kjellstr÷m, 1973) Lentin and Williams, 1976, according to Gocht, 1976.
Questionable tax. sr. synonym of Triblastula nuda 0. Wetzel, 1961, according to Gocht, 1976.
Questionable tax. sr. synonym of Triblastula tubulata 0. Wetzel, 1961, according to Gocht, 1976. Stover and Evitt, 1978, concurred with Gocht"s opinion. Marheinecke, 1992, accepted all the synonymies without comment.
Tax. sr. synonym of Amphidiadema rectangularis (Cookson and Eisenack, 1962) Lentin and Williams, 1976, according to Stover and Evitt, 1978, who were following Gocht, 1976. However, Gocht, 1976, only considered the specimen of Amphidiadema rectangularis illustrated by Kjellstr÷m, 1973, to be synonymous.
Holotype: O.Wetzel, 1961, pl. 2, fig. 3; Sarjeant, 1985, pl. 2, fig. 1; Jan du Chene et al., 1986, fig. 46, fig. 9-10
Locus typicus: Baltic Cretaceous flintstones
Stratum typicum: Erratic, ?Late Cretaceous
Translation Gocht, 1976: LPP
Original description: O.Wetzel, 1961, p. 340: Triblastula quasicribrata
Diagnosis: Central body spheroidal and spineless. Both "caps" are cylindrical- cuboidal, narrower toward the ends, especially the one ("epitheca") having a more projecting field of pore-meshes with terminal edges protruding. "Pylomes" are common.
Dimensions: c. 100 x 50 Ám.
Extended diagnosis: Gocht, 1976, p. 322-323
Outer shell delicate, elongate pillar-shaped. Apical part bluntly flattened, with short, coronet-shaped tip. Antapex flat or slightly rounded. In the region of the girdle, the outer shell is constricted and appressed to the iiner body.
Girdle fields diamond-shaped to polygonal. Thus, an alternating arrangement of the elongate, 5-6 sided fields of the pre- and postcingular series. Ventral apical fields (1", 4") elongate, dorsals (2", 3") broadly quadrangular. Antapical field trapezoidal. Behind 1""" the accessory field 1p. Between the girdle ends small sulcal fields may be visible.
Field margins expressed very diversely: longitudinal field-margins generally well-developed, at the pre- and postcingulars folded into sharp margins, partly also stiffened into strong edges, which terminate at the girdle. Between these ends arch-shaped lines run around the equator, indicating the zone of contact between outer and inner shell. Field margins of the ventral region and the apex as thin or intermediately strong edges. Longitudinal margins of the girdle-fields in the form of strong projections or bulges (often absent between 3c and 4c). Other girdle-margins, sometimes also the margins of the sulcal fields, delicate and fine as a hair. Formula of the reflected tabulatio: 4", 6"", 6c, 5""", 1p, 1""""; ns. Surface of the outer shell smooth, sometimes finely granulate.
Inner body of only minor firmness, broadly oval to al,ost spherical. Preccingular archaeopyle (3""). In the antapical field often a regularly formed opening.
Dimensions: Holotype length 97 Ám, width 51 Ám; inner shell 43:43 Ám. Other specimens length 82-110 Ám, width 44-57 Ám; diameter 97 Ám (L), 51 Ám (W). 35 specimens.
Supplemental description: Hultberg, 1985, p. 134-135
Bicavate to circumcavate cyst, composed of endophragm and periphragm, separated by pericoels, except at the equatorial part of the cyst. The surface of the endophragm is granulate. The surface of the periphragm is smooth. The shape of the endophragm is ovoidal. The periphragm is slightly rectangular in outline, with a low, pyramidal apical protrusion. Paratabulation is incompletely expressed by folds in the periphragm. The paratabulation probably follows the standard gonyaulacacean paratabulation formula. The archeopyle is precingular, type P, forme1 by the detachment of paraplate 3"". Operculum free. Paracingulum is indicated by thin folds in the periphragm. Parasulcus is not indicated.
Size - 68-80Ám (length), 37-60Ám (breadth).
Afinities:
O. Wetzel, 1961, p. 340: Comment: Amphidiadema denticulata Cookson and Eisenack (1960) appears closely similar to this species of Triblastula, but it differs in the terminal portions, which are smaller and more open but not "quasicribrate" (i.e., perforated like a sieve). The authors themselves regarded their new species as closely related to another of their new forms, Deflandrea tripartita Cookson and Eisenack (1960) (see my remarks under Bulbodinium O.Wetzel, 1960, below).