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Muderongia sarjeantii
Muderongia sarjeantii Volkheimer 2010, p.240, figs.4E–H.
Holotype: Volkheimer 2010, fig.4E.
Age: late Valanginian–early Hauterivian.
Original description (Volkheimer, 2010):
Muderongia sarjeantii Volkheimer, sp. nov. (Figs. 4, E-H)
Diagnosis: A species of Muderongia in which all three horns are of comparable dimensions, very broad-based, tapering gently to blunt, rather ragged-looking tips and having a length between two-fifths and three-fifths of the length of the central body. Cingulum marked by faint lines and a slight central depression. Paratabulation not otherwise directly indicated. Endoblast almost spheroidal, but bulging into the base of the right lateral horn. Endophragm finely to coarsely granular; perifragm levigate or very finely granulate.
Description. Large cysts, ceratioid, cornucavate, with three prominent horns, apical, antapical and right lateral. The horns are broad-based, tapering gently to a blunt and irregular open tip. The apical horn is polar in position, its length less than that of the central body. The antapical horn may be polar in position or may be positioned slightly or markedly to the left of the antapical pole; its length is less than that of the central body. The right lateral horn is postcingular in position; it may be shorter than the other horns or may approach them in length. It may be straight or recurved and may exhibit a cingular notch. Endoblast spheroidal to ellipsoidal in ambitus or bulging into the base of the right lateral horn. It may exhibit some dorsoventral flattening or may be rotund. Periblast may exhibit few low ridges bounding the cingulum, which may be shallowly concave. Alternatively, the cingulum may not be directly indicated. Sulcus and paratabulation marked by faint lines or not at all. Endophragm and periphragm laevigate or finely granulate or punctate. Archaeopyle apical (type tA). Archaeopyle suture rounded to weakly angular; sulcal notch, when discernible, offset slightly to the left. Operculum free or attached.
Derivation of name. In honour of Dr. William Antony Swithin Sarjeant, distinguished palynologist and great author of science fiction.
Lodgement. Stored in the Unidad Paleopalinología del IANIGLA (Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales), CCT-CONICET-Mendoza. The coordinates indicated correspond to the microscope Leitz Dialux 20 located at IANIGLA.
Holotype. Prep. 9041 A4/4C;32.5/104.4 MPLP (Mendoza-Paleopalinoteca-Laboratorio-Paleopalinología). Total length: 72 um; endoblast 40x46 um. (fig. 4.E).
Paratype. Prep. 9041 A4/2H:15.1/93.1 MPLP. Total length: 74 um; endoblast 35x48 um (fig. 4.H).
Observations. The wide, blunt and distally open horns are marking the difference from M. siciliana and other earlier described species of Muderongia.
Dimensions. Range of maximum total length: 69-101 μm (6 specimens measured). Specimen illustrated in figure 5.8: total length 74 μm; endoblast 35x48 μm
Stratigraphic range. Lower Member of the Agrio Formation (upper Valanginian to lower Hauterivian).
Holotype: Volkheimer 2010, fig.4E.
Age: late Valanginian–early Hauterivian.
Original description (Volkheimer, 2010):
Muderongia sarjeantii Volkheimer, sp. nov. (Figs. 4, E-H)
Diagnosis: A species of Muderongia in which all three horns are of comparable dimensions, very broad-based, tapering gently to blunt, rather ragged-looking tips and having a length between two-fifths and three-fifths of the length of the central body. Cingulum marked by faint lines and a slight central depression. Paratabulation not otherwise directly indicated. Endoblast almost spheroidal, but bulging into the base of the right lateral horn. Endophragm finely to coarsely granular; perifragm levigate or very finely granulate.
Description. Large cysts, ceratioid, cornucavate, with three prominent horns, apical, antapical and right lateral. The horns are broad-based, tapering gently to a blunt and irregular open tip. The apical horn is polar in position, its length less than that of the central body. The antapical horn may be polar in position or may be positioned slightly or markedly to the left of the antapical pole; its length is less than that of the central body. The right lateral horn is postcingular in position; it may be shorter than the other horns or may approach them in length. It may be straight or recurved and may exhibit a cingular notch. Endoblast spheroidal to ellipsoidal in ambitus or bulging into the base of the right lateral horn. It may exhibit some dorsoventral flattening or may be rotund. Periblast may exhibit few low ridges bounding the cingulum, which may be shallowly concave. Alternatively, the cingulum may not be directly indicated. Sulcus and paratabulation marked by faint lines or not at all. Endophragm and periphragm laevigate or finely granulate or punctate. Archaeopyle apical (type tA). Archaeopyle suture rounded to weakly angular; sulcal notch, when discernible, offset slightly to the left. Operculum free or attached.
Derivation of name. In honour of Dr. William Antony Swithin Sarjeant, distinguished palynologist and great author of science fiction.
Lodgement. Stored in the Unidad Paleopalinología del IANIGLA (Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales), CCT-CONICET-Mendoza. The coordinates indicated correspond to the microscope Leitz Dialux 20 located at IANIGLA.
Holotype. Prep. 9041 A4/4C;32.5/104.4 MPLP (Mendoza-Paleopalinoteca-Laboratorio-Paleopalinología). Total length: 72 um; endoblast 40x46 um. (fig. 4.E).
Paratype. Prep. 9041 A4/2H:15.1/93.1 MPLP. Total length: 74 um; endoblast 35x48 um (fig. 4.H).
Observations. The wide, blunt and distally open horns are marking the difference from M. siciliana and other earlier described species of Muderongia.
Dimensions. Range of maximum total length: 69-101 μm (6 specimens measured). Specimen illustrated in figure 5.8: total length 74 μm; endoblast 35x48 μm
Stratigraphic range. Lower Member of the Agrio Formation (upper Valanginian to lower Hauterivian).