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Eurysphaeridium glabrum
Eurysphaeridium "glabrum" Wilson in Slimani, 1994, p.78. Name not validly published: no description or illustration. Taxonomic senior synonym: Neoeurysphaeridium glabrum, according to Slimani (2001a, p.193).
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Original description: [Slimani, 1994, p. 78-80] (translated from French):
Derivation of the name:
Latin: glaher, smooth; reference to the smooth surface of the periphragm and processes.
Holotvpe:
Beutenaken ech. 12. preparation 2, coord. E.F. V51/3.
Paratype:
Turnhout -933 m, preparation 7, coord. E.F. V35/1.
Type locality:
Beutenaken ech. 12.
Type horizon:
Maastrichtian inf.
Synonymy:
1971: Hystrichokolpoma sequanaportus DEFLANDR E and DEFLANDRE-RIGAUO , 1958 - WILSON , pl. 4, fig. 7.
1974: Eurysphaeridium glabrum in WILSON , p. 384-385, pl. 18, fig. 1-4, text-fig. 55.
Diagnosis:
Scolochorate gonyaulacoid cyst with a subspheroidal to ellipsoidal central body. It bears
intratabular precingulate and postcingulate processes (one per plate) which are prominent, 1/2 to 3/4 of the diameter
of the central body, smooth, hollow, broad and bulbous. It also has small, short simple intratabular processes (1/
4 to 1/3 of the diameter of the central body) very thin, one per paraplate in the apical and antapical region
and usually two per plate in the paracingulate and parasulcal region. The paratabulation is
as follows: 4', 5", 6c, 4 - 5'", lp, 3 - 5s, lp. A long distinct apical protrusion allows orientation of the cyst.
The archaeopyle is precingulate of type P(3") with a free operculum.
Dimensions:
Holotype. central body, length: 46 μm, width: 40 μm.
Large processes, length: 20 - 28 μm, width: 20 - 34 μm.
Small processes, length: 18-20 μm, width: 2 μm.
Variations: central body, length: 44 - 50 μm, width: 38 - 47 μm.
Large processes, length: 20 - 40 μm, width: 11 - 28 μm.
Small processes, length: 10-24 μm, width: 1 - 2 μm.
Apical horn, length: 6 - 12 μm, width: 3 - 4 μm.
Number of specimens measured: 10.
Material:
15 specimens.
Description:
The smooth, thick endophragm of about 1 pm and the thinner, smooth or slightly chamois periphragm are in close contact between the processes. The periphragm gives rise to two types of intratabular processes. The precingulate and postcingulate processes are broad, straight and distally closed or communicate with the exterior by means of a foramen 3 to 6 μm in diameter; the margins of their distal ends bear numerous small spines. The apical, paracingulate, sulcal processes and the antapical process are often thin, solid or hollow, straight, flexuous or recurved, and terminate distally with an acuminate, truncated or slightly flared tip. The antapical process and some precingulate and postcingulate processes may be less broad to very thin, solid or hollow. The apical horn consists of a long, hollow, rounded protrusion of the autophragm.
Comparison:
This species is very closely comparable to specimens of Hystrichokolpoma sequanaportus in WILSON ( 1971 ) and to Eurysphaeridium glabrum of WILSON ( 1974) in his unpublished Ph.D. work.
Stratigraphic distribution:
Beutenaken: scale 1 2 to 20 , Halembaye: scale 27 ; Upper Campanian - Lower Maastrichtian (B. minor Zone - B. lanceolata Zone). Turnhout: -933 to -931.50 m, Upper Campanian - Lower Maastrichtian.
In WILSON (1974), Upper Campanian (langei Zone), Denmark; Lower Maastrichtian. (lanceolata Zone), region of Maastricht.
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Original description: [Slimani, 1994, p. 78-80] (translated from French):
Derivation of the name:
Latin: glaher, smooth; reference to the smooth surface of the periphragm and processes.
Holotvpe:
Beutenaken ech. 12. preparation 2, coord. E.F. V51/3.
Paratype:
Turnhout -933 m, preparation 7, coord. E.F. V35/1.
Type locality:
Beutenaken ech. 12.
Type horizon:
Maastrichtian inf.
Synonymy:
1971: Hystrichokolpoma sequanaportus DEFLANDR E and DEFLANDRE-RIGAUO , 1958 - WILSON , pl. 4, fig. 7.
1974: Eurysphaeridium glabrum in WILSON , p. 384-385, pl. 18, fig. 1-4, text-fig. 55.
Diagnosis:
Scolochorate gonyaulacoid cyst with a subspheroidal to ellipsoidal central body. It bears
intratabular precingulate and postcingulate processes (one per plate) which are prominent, 1/2 to 3/4 of the diameter
of the central body, smooth, hollow, broad and bulbous. It also has small, short simple intratabular processes (1/
4 to 1/3 of the diameter of the central body) very thin, one per paraplate in the apical and antapical region
and usually two per plate in the paracingulate and parasulcal region. The paratabulation is
as follows: 4', 5", 6c, 4 - 5'", lp, 3 - 5s, lp. A long distinct apical protrusion allows orientation of the cyst.
The archaeopyle is precingulate of type P(3") with a free operculum.
Dimensions:
Holotype. central body, length: 46 μm, width: 40 μm.
Large processes, length: 20 - 28 μm, width: 20 - 34 μm.
Small processes, length: 18-20 μm, width: 2 μm.
Variations: central body, length: 44 - 50 μm, width: 38 - 47 μm.
Large processes, length: 20 - 40 μm, width: 11 - 28 μm.
Small processes, length: 10-24 μm, width: 1 - 2 μm.
Apical horn, length: 6 - 12 μm, width: 3 - 4 μm.
Number of specimens measured: 10.
Material:
15 specimens.
Description:
The smooth, thick endophragm of about 1 pm and the thinner, smooth or slightly chamois periphragm are in close contact between the processes. The periphragm gives rise to two types of intratabular processes. The precingulate and postcingulate processes are broad, straight and distally closed or communicate with the exterior by means of a foramen 3 to 6 μm in diameter; the margins of their distal ends bear numerous small spines. The apical, paracingulate, sulcal processes and the antapical process are often thin, solid or hollow, straight, flexuous or recurved, and terminate distally with an acuminate, truncated or slightly flared tip. The antapical process and some precingulate and postcingulate processes may be less broad to very thin, solid or hollow. The apical horn consists of a long, hollow, rounded protrusion of the autophragm.
Comparison:
This species is very closely comparable to specimens of Hystrichokolpoma sequanaportus in WILSON ( 1971 ) and to Eurysphaeridium glabrum of WILSON ( 1974) in his unpublished Ph.D. work.
Stratigraphic distribution:
Beutenaken: scale 1 2 to 20 , Halembaye: scale 27 ; Upper Campanian - Lower Maastrichtian (B. minor Zone - B. lanceolata Zone). Turnhout: -933 to -931.50 m, Upper Campanian - Lower Maastrichtian.
In WILSON (1974), Upper Campanian (langei Zone), Denmark; Lower Maastrichtian. (lanceolata Zone), region of Maastricht.