Palynology of Middle Tertiary lacustrine deposits
Palynology of Middle Tertiary lacustrine deposits
Palynology of Middle Tertiary lacustrine deposits
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
220 K. TAKAHASHI & U. lux<br />
Tricolpopollenites d. minutus Gonzalez Guzman n. comb.<br />
PI. 22, figs. 17-18.<br />
1966 Psilatricolpites minutus Gonzalez Guzman, Van Hoeken-Klinkenberg, Leidse Geol. Meded.,<br />
vol. 38, p. 41, pI. II, fig. 6.<br />
1967 Psilatricolpites minutus Gonzalez Guzman, B. J. Brill, Leiden, p. 27, pI. 1, Figs. 2<br />
2 e.<br />
Diagnostic characters: Tricolpate pollen <strong>of</strong> ellipsoidal to broad-ellipsoidal or prolate to<br />
subprolate shape and rounded apices. The three narrow colpi are quite distinctly<br />
lined towards the poles. Exine chagrenate or psilate, two-layered, O. 5-1. 5 pm<br />
thick.<br />
Measurements: 21 - 24 pm X 14 - 19 pm in size.<br />
Width / length ratio: 0.66-0.79.<br />
Previous records: South America (<strong>Middle</strong> Eocene) and Africa (<strong>Middle</strong> Eocene).<br />
Colombia: <strong>Middle</strong> Eocene (Tibu area) .<br />
Nigeria: <strong>Middle</strong> Eocene (Gbekebo).<br />
Remarks: Van der Hammen (1956, p. 88) defined the subgenus Psilatricolpites with<br />
in the genus Tricolpites Erdtman 1947, he presented Tricolpites (Psilatricolpites) incomptus<br />
v. d. Hammen 1956 as subgenotype by selecting the pollen <strong>of</strong> recent Bartsia<br />
santalinaefolia (HBK) BEMTH.<br />
(Scrophulariaceae) as the type-specimen.<br />
Pierce (1961) promoted the subgenus Psilatricolpites to a separate form-genus based<br />
on Psilatricolpites incomptus (v. d. Hammen) Pierce as type species. V. d. Hammen<br />
and Wymstra (1964) proposed Psilatricolpites clarissimus (v. d. H.) as lectogenotype.<br />
Potonie 0966, p. 163) again referred to another type species: Psilatricolpites<br />
psilatus Pierce 1961. After all, Psilatricolpites Pierce is nomenc1aturally invalid and<br />
the designation <strong>of</strong> P. clarissimus and P. psilatus as type species contradicts the<br />
ICBN.<br />
Botanical affinity: Cupuliferae (?)<br />
Tricolpopollenites densus Pflug<br />
PI. 22, figs. 21-22.<br />
1953 Tricolpopollenites densus Pflug, Thomson & Pflug, Palaeontographica, B, 94, S. 96,<br />
Taf. 11, Fig. 55-58.<br />
Diagnostic characters: Tricolpate pollen. Figura spheroidal with circular to subcircular<br />
contour in subpolar view. The three conspicuous colpi are slender and gaping;
Change language