UTRECHT MICROPALEONTOLOGICAL BUllETINS

The cusp is slightly proclined. Its anterior and posterior edges are sharp.
The anterior edge is deflected and extended basally, to form an antero-lateral
process. On this process some vague denticle-like structures may occur. On
the outer side of the cusp there is a sharp costa which continues over the
base to form a lateral process, where it meets the aboral margin. This process
is keeled and not denticulated.
Differential diagnosis: This species differs from Gothodus costulatus
LINDSTROM in the sidewards bending of the unit, the orientation of the
denticles and their flatness.
Remarks: Most probably this is the gothodiform element of a multi-element
species. For the time being, G.microdentatus is considered to be a form
species.
Regional occurrence: This species was only found in the top portion of
member Kk2 at Kopingsklint (chart II).
Biostratigraphic range: Gothodus microdentatus was found only in the
Triangulodus subtilis/Gothodus microdentatus Assemblage Zone (fig. 15).
Genus Microzarkodina LINDSTROM, 1971
Type species: Prioniodina flabellum LINDSTROM, 1955.
Definition: "Microzarkodina includes multi-element conodonts in which the
ozarkodiniform element is relatively short and high and has few denticles,
particularly in front of the cusp. Multiramiform elements include cordylodiform
and trichonodelliform elements, which are provided with high, slender,
subequal, and conspicuously divergent denticles. The oistodiform elements
lack an anterior extension. Basal cavity is shallow in all elements. Cusp and
denticles consist of white matter" (op. cit. Lindstrom, 1971, p. 57).
Microzarkodina flabellum (LINDSTROM), emend. LINDSTROM, 1971
(PI. 7, figs. 18-23)
Prioniodinaflabellum LINDSTROM, 1955a, p. 587, P16, figs. 23-25.
Microzarkodina flabellum (LINDSTROM). LINDSTROM, 1971, p. 58, PI. 1, figs. 6-11; Figs. 19,20.
Cordylodus perlongus LINDSTROM, 1955a, p. 552, PI. 6, figs. 36, 37.
Trichonodella alae LINDSTROM, 1955a, p. 599, PI. 6, figs. 38-40. LINDSTROM, 1964, p. 87, fig.
31L.
Trichonodella? irregularis LINDSTROM, 1955a, p. 600, PI. 6, figs. 21, 22. LINDSTROM, 1964, p. 87,
fig. 31N. ..
"Sannemannula element", LINDSTROM, 1964, p. 87, fig. 31M.
Oistodus linguatus complanatus LINDSTROM, 1955a, p. 578, PI. 3, fig. 37,38.
Remarks: Nothing needs to be added to Lindstrom's (1971) description of
the species. .