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Hexasphaera asymmetrica
Hexasphaera asymmetrica (Deflandre and Courteville, 1939, p.100–101, pl.4, figs.1–2) Clarke and Verdier, 1967, p.43. Emendation: Clarke and Verdier, 1967, p.43, as Hexasphaera asymmetrica.
Combination illegitimate: the generic name is illegitimate.
NOW Callaiosphaeridium. Originally Hystrichosphaeridium, subsequently (and now) Callaiosphaeridium, thirdly Hexasphaera (combination illegitimate).
Holotype: Deflandre and Courteville, 1939, pl.4, fig.1; Fensome et al., 1993a, fig.1 — p.949.
Locus typicus: Quarry at Marcoing, Departement du Nord, France
Stratum typicum: Senonian
Translation Deflandre and Courteville, 1939: LPP
Original description: Deflandre and Courtville 1939, p. 100-101:
Hystrichosphaeridium assymetricum
Diagnosis: The brown, spheroidal shell bears six radiating, tubular appendices around the equator, often unequal in diameter as well as in length. These processes are widened at their distal ends, which are finely denticulate and bear several quite long flexible spines. At the two poles there are two roughly pentagonal fields, unequal, bearing solid, furcate processes at the corners, of very diverse form. These processes unite at their bases to form ridges or ribs which define the polar ffield, then producing more or less distinct meridian crests, which seem to reach the opposite polar field, as follows from the semi- schematical drawing (however, drawing given under reserve). One of the meridian ribs seems to bear, towards the equatorial plane, a simple or furcate, straight or bent process, visible on the left side of the forementioned drawing. Some of the polar processes may be lacking (like in the holotype, where here are only 4); another time, however, they split in two branches, uniting towards their base.
Emended description: Clarke and Verdier, 1967, p. 43-44
Main body more or less circular in outline, probably originally spherical. Tabulation distinct. The apical and antapical plates bear at each corner a solid slender process which is openly bifurcate at the extremity. A ledge connects each process; the ledge is smooth at the top but may contain perforations, especially at the base. Six large, hollow, tubular appendages are present around the equator (reflecting perhaps a girdle). These are long and expanded distally from which recurved filaments project (see text-fig. 17). The disposition of these large processes with regard to the three large plates is such that each plate has one process in the centre and half a process at its junction with the next plate, i.e. three processes are situated on the sutures and three are centra-tabular (see pl. 7, figs. 1,2). The sutures separating the large plates are frequently perforate giving a "beaded" appearance and can often be seen to extend onto three of the large processes. Archaeopyle formed by the loss of the apical plate. Generally the amount of buckling seen in most specimens precludes a clear observation of this feature.
Combination illegitimate: the generic name is illegitimate.
NOW Callaiosphaeridium. Originally Hystrichosphaeridium, subsequently (and now) Callaiosphaeridium, thirdly Hexasphaera (combination illegitimate).
Holotype: Deflandre and Courteville, 1939, pl.4, fig.1; Fensome et al., 1993a, fig.1 — p.949.
Locus typicus: Quarry at Marcoing, Departement du Nord, France
Stratum typicum: Senonian
Translation Deflandre and Courteville, 1939: LPP
Original description: Deflandre and Courtville 1939, p. 100-101:
Hystrichosphaeridium assymetricum
Diagnosis: The brown, spheroidal shell bears six radiating, tubular appendices around the equator, often unequal in diameter as well as in length. These processes are widened at their distal ends, which are finely denticulate and bear several quite long flexible spines. At the two poles there are two roughly pentagonal fields, unequal, bearing solid, furcate processes at the corners, of very diverse form. These processes unite at their bases to form ridges or ribs which define the polar ffield, then producing more or less distinct meridian crests, which seem to reach the opposite polar field, as follows from the semi- schematical drawing (however, drawing given under reserve). One of the meridian ribs seems to bear, towards the equatorial plane, a simple or furcate, straight or bent process, visible on the left side of the forementioned drawing. Some of the polar processes may be lacking (like in the holotype, where here are only 4); another time, however, they split in two branches, uniting towards their base.
Emended description: Clarke and Verdier, 1967, p. 43-44
Main body more or less circular in outline, probably originally spherical. Tabulation distinct. The apical and antapical plates bear at each corner a solid slender process which is openly bifurcate at the extremity. A ledge connects each process; the ledge is smooth at the top but may contain perforations, especially at the base. Six large, hollow, tubular appendages are present around the equator (reflecting perhaps a girdle). These are long and expanded distally from which recurved filaments project (see text-fig. 17). The disposition of these large processes with regard to the three large plates is such that each plate has one process in the centre and half a process at its junction with the next plate, i.e. three processes are situated on the sutures and three are centra-tabular (see pl. 7, figs. 1,2). The sutures separating the large plates are frequently perforate giving a "beaded" appearance and can often be seen to extend onto three of the large processes. Archaeopyle formed by the loss of the apical plate. Generally the amount of buckling seen in most specimens precludes a clear observation of this feature.