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Muderongia simplex ssp. simplex
Muderongia simplex ssp. simplex
Autonym. Poulsen, 1996 retained Muderongia simplex ssp. microperforata, hence Muderongia simplex ssp. simplex is not redundant anymore.
Holotype: Alberti, 1961, pl.2, fig.4
Locus typicus: Dabendorf Well near Berlin, Germany
Stratum typicum: Valanginian-Early Barremian
Translation Alberti, 1961: LPP
Original description: Alberti 1961, p. 12
Diagnosis: Shell flattened, the outline about rhombic. Apical horn, two mostly
unequally long antapical horns and two strongly protruding and distally indented lateral horns. The latter are generally unequally long, standing almost perpendicular to the longitudinal axis. Apical and antapical horns distally slightly blunt. A flat transversal furrow is now and then present, a longitudinal furrow is rare. A weak tabulation of the shell is sometimes indicated. Edges smooth, without
sines or thorns. Inner body always present.
Emended diagnosis: Monteil, 1991, p. 475
Cysts proximate, compressed dorsoventrally, two-layered, cornucavate. Pericyst ceratioid, asymmetrical, with 5 prominent horns: 1 apical (axial, type AP l); 2 subequal lateral (axial, type L 1), indented; 2 inequal antapical (joined, type ATP ll). Left antapical horn longer (up to four times) than the right one. Horns normal with distal extremities closed and rounded; proximal extremities narrow. Endocyst typically cruciform pentangular, stretching out up to the middle part of the five horns. Periphragm thin, psilate to scabrate. Endophragm thin, psilate to granulate. Archeopyle apical, type (4A), with angular margin. Parasulcal notch marked. Operculum free. Paratabulation indicated by archeopyle, by low parasutural ridges or septa. Formula: ?pr, 4", 0a, 6", 6c, 6""", 1p, 1"""". Pericingulum marked by indentation of lateral horns and by parallel transverse structures. Perisulcus indicated by parasulcal notch offset. Perisulcal area not observed.
Dimensions of the holotype (with operculum): 151 Ám x 121 Ám (overall L x 1).
Affinities:
Alberti, 1961, p. 12: M simplex differs from M. mcwhaei in the development of the lateral horns as well as the, mostly stronger, second antapical horn.
Monteil, 1991, p. 475: Muderongia simplex differs from Senoniasphaera tabulata Backhouse & Helby in Helby 1987 in having two lateral horns rather than an equatorial paracingular protrusion.
Autonym. Poulsen, 1996 retained Muderongia simplex ssp. microperforata, hence Muderongia simplex ssp. simplex is not redundant anymore.
Holotype: Alberti, 1961, pl.2, fig.4
Locus typicus: Dabendorf Well near Berlin, Germany
Stratum typicum: Valanginian-Early Barremian
Translation Alberti, 1961: LPP
Original description: Alberti 1961, p. 12
Diagnosis: Shell flattened, the outline about rhombic. Apical horn, two mostly
unequally long antapical horns and two strongly protruding and distally indented lateral horns. The latter are generally unequally long, standing almost perpendicular to the longitudinal axis. Apical and antapical horns distally slightly blunt. A flat transversal furrow is now and then present, a longitudinal furrow is rare. A weak tabulation of the shell is sometimes indicated. Edges smooth, without
sines or thorns. Inner body always present.
Emended diagnosis: Monteil, 1991, p. 475
Cysts proximate, compressed dorsoventrally, two-layered, cornucavate. Pericyst ceratioid, asymmetrical, with 5 prominent horns: 1 apical (axial, type AP l); 2 subequal lateral (axial, type L 1), indented; 2 inequal antapical (joined, type ATP ll). Left antapical horn longer (up to four times) than the right one. Horns normal with distal extremities closed and rounded; proximal extremities narrow. Endocyst typically cruciform pentangular, stretching out up to the middle part of the five horns. Periphragm thin, psilate to scabrate. Endophragm thin, psilate to granulate. Archeopyle apical, type (4A), with angular margin. Parasulcal notch marked. Operculum free. Paratabulation indicated by archeopyle, by low parasutural ridges or septa. Formula: ?pr, 4", 0a, 6", 6c, 6""", 1p, 1"""". Pericingulum marked by indentation of lateral horns and by parallel transverse structures. Perisulcus indicated by parasulcal notch offset. Perisulcal area not observed.
Dimensions of the holotype (with operculum): 151 Ám x 121 Ám (overall L x 1).
Affinities:
Alberti, 1961, p. 12: M simplex differs from M. mcwhaei in the development of the lateral horns as well as the, mostly stronger, second antapical horn.
Monteil, 1991, p. 475: Muderongia simplex differs from Senoniasphaera tabulata Backhouse & Helby in Helby 1987 in having two lateral horns rather than an equatorial paracingular protrusion.