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Wetzeliella (Wetzeliella) hampdenensis
Wetzeliella (Wetzeliella) hampdenensis Wilson, 1967
Holotype: Wilson, 1967, fig.19
Locus typicus: Hampden, south of Oamaru, New Zealand
Stratum typicum: Arnold Series mudstone, Bortonian, Middle Eocene
Original description: Wilson, 1967, p.480-481
Periphragm outline pentagonal, asymmetric. Horns comparatively short apart from right antapical horn which is longer and more pointed than the others. Side horns broad, short, and blunt.
Left antapical horn always present, substantially shorter than right antapical horn. Periphragm bordered by short, broad, sharply tapered aculeate processes (process length 3-9 µm, bases 3-7 µm, aculei length 2-5 µm, number of aculei 3-6). The smallest processes occur on the horn margins. Processes of periphragm tapered (bases 2-7 µm), aculeate, up to 16 µm in length. and arranged in simulate complexes. Capsule sub-rhomboidal to sub-pentagonal; pericoel usually fairly well developed. Archeopyle trapezium-shaped. Tabulation apparently similar to Wetzeliella (W.) articulata.
Dimensions: Holotype: l= 132 µm, h= 118 µm, capsule 83 µmX 88 µm, apical horn 16 µm, left antapical horn 11 µm, right antapical horn 27 µm, Iateral horns 11 µm. Range: 1= 105(123) 138 µm, h= 91(100)118 µm, capsule (1) 82 µm X76 µm, ap. h. 11(15)19 µm, l. ant. h. 6(11)14 µm, r. ant. h. 11(19)27 µm, lat. h. 8(10)11 µm.
Affinities:
Wilson, 1967, p.481: Wetzeliella (W.) hampdenensis has some resemblance to W. (W.) ovalis Eisenack but has far more prominent horns. The horns are much shorter than those of W. (W.) articulata. The characteristically aculeate processes are somewhat similar to the London Clay specimens of W. (W.) ovalis (Williams and Downie, 1966). However, the processes of W. (W.) hampdenensis appear to be shorter, especially those at the margin, and much more sharply tapered. Wetzeliella (W.) exinulata Vozzhennikova from the Eocene of Sineria appears to very closely resemble W. (W.) humpdenensis in the illustration by Vozzhennikova (1960, pl. 3, fig. 3). The periphragm outlines of the two species are very similar and the processes basically of the same type although far more numerous on the Russian species. Unfortunately, there appears to be no formal description of Wetzeliella (W.) exinulata.
Holotype: Wilson, 1967, fig.19
Locus typicus: Hampden, south of Oamaru, New Zealand
Stratum typicum: Arnold Series mudstone, Bortonian, Middle Eocene
Original description: Wilson, 1967, p.480-481
Periphragm outline pentagonal, asymmetric. Horns comparatively short apart from right antapical horn which is longer and more pointed than the others. Side horns broad, short, and blunt.
Left antapical horn always present, substantially shorter than right antapical horn. Periphragm bordered by short, broad, sharply tapered aculeate processes (process length 3-9 µm, bases 3-7 µm, aculei length 2-5 µm, number of aculei 3-6). The smallest processes occur on the horn margins. Processes of periphragm tapered (bases 2-7 µm), aculeate, up to 16 µm in length. and arranged in simulate complexes. Capsule sub-rhomboidal to sub-pentagonal; pericoel usually fairly well developed. Archeopyle trapezium-shaped. Tabulation apparently similar to Wetzeliella (W.) articulata.
Dimensions: Holotype: l= 132 µm, h= 118 µm, capsule 83 µmX 88 µm, apical horn 16 µm, left antapical horn 11 µm, right antapical horn 27 µm, Iateral horns 11 µm. Range: 1= 105(123) 138 µm, h= 91(100)118 µm, capsule (1) 82 µm X76 µm, ap. h. 11(15)19 µm, l. ant. h. 6(11)14 µm, r. ant. h. 11(19)27 µm, lat. h. 8(10)11 µm.
Affinities:
Wilson, 1967, p.481: Wetzeliella (W.) hampdenensis has some resemblance to W. (W.) ovalis Eisenack but has far more prominent horns. The horns are much shorter than those of W. (W.) articulata. The characteristically aculeate processes are somewhat similar to the London Clay specimens of W. (W.) ovalis (Williams and Downie, 1966). However, the processes of W. (W.) hampdenensis appear to be shorter, especially those at the margin, and much more sharply tapered. Wetzeliella (W.) exinulata Vozzhennikova from the Eocene of Sineria appears to very closely resemble W. (W.) humpdenensis in the illustration by Vozzhennikova (1960, pl. 3, fig. 3). The periphragm outlines of the two species are very similar and the processes basically of the same type although far more numerous on the Russian species. Unfortunately, there appears to be no formal description of Wetzeliella (W.) exinulata.