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Odontochitina spinosa
Odontochitina spinosa Wilson, 1984
Holotype: Wilson, 1984, figs.22, 25-26
Locus typicus: Leamington Stream, N Canterbury, New Zealand
Stratum typicum: Maastrichtian
Original description: Wilson, 1984, p.554, 556
Cyst very large, comprising a relatively thick walled smooth subspherical endocyst and a relatively thin walled spinose pericyst. Three very long slender faintly striate pointed horns present, the longest being the apical horn and the shortest the lateral horn. Lateral horn located immediately posterior to paracingulum and pointed more towards antapex than to side. Slender toothlike spines are especially common at the base of the horns and are sometimes aligned in rows, although no paratabulation pattern could be determlned. Archeopyle broad with a somewhat angular margin. Faint paracingulum usually delimited by rows of small spines. Parasulcus may be indicated by large smooth area on midventral surface. Dimensions: Holotype: length of central body 81 µm, breadth 95 µm, length of apical horn 230 µm, antapical horn 135 µm, lateral horn 78 µm, spines 2-7 µm. Range (20 specimens): apical horn 170(205)243 µm, antapical horn 103(134)176 µm, lateral horn 73(95)122 µm, maximum diameter of central body 70(87)116 µm.
Affinities:
Wilson, 1984, p.556: Odontochitina spinosa is readily distinguished from other species of Odontochitina in having a spinose periphragm. It is almost invanably associated with O. porifera and the last appearances of both species appear to be at approximately the same level during the mid Haumunan, although O. porifera makes its first appearance somewhat earlier than O. spinosa.
Holotype: Wilson, 1984, figs.22, 25-26
Locus typicus: Leamington Stream, N Canterbury, New Zealand
Stratum typicum: Maastrichtian
Original description: Wilson, 1984, p.554, 556
Cyst very large, comprising a relatively thick walled smooth subspherical endocyst and a relatively thin walled spinose pericyst. Three very long slender faintly striate pointed horns present, the longest being the apical horn and the shortest the lateral horn. Lateral horn located immediately posterior to paracingulum and pointed more towards antapex than to side. Slender toothlike spines are especially common at the base of the horns and are sometimes aligned in rows, although no paratabulation pattern could be determlned. Archeopyle broad with a somewhat angular margin. Faint paracingulum usually delimited by rows of small spines. Parasulcus may be indicated by large smooth area on midventral surface. Dimensions: Holotype: length of central body 81 µm, breadth 95 µm, length of apical horn 230 µm, antapical horn 135 µm, lateral horn 78 µm, spines 2-7 µm. Range (20 specimens): apical horn 170(205)243 µm, antapical horn 103(134)176 µm, lateral horn 73(95)122 µm, maximum diameter of central body 70(87)116 µm.
Affinities:
Wilson, 1984, p.556: Odontochitina spinosa is readily distinguished from other species of Odontochitina in having a spinose periphragm. It is almost invanably associated with O. porifera and the last appearances of both species appear to be at approximately the same level during the mid Haumunan, although O. porifera makes its first appearance somewhat earlier than O. spinosa.