View - KU ScholarWorks - University of Kansas

FIGURE
PLATE 2
Conodonts of Tendon tus Lineage
1,2. Utahconus utahensis (Miller).-1. Unicostate
element with posterior sharp costa extending
to base of cusp, USNM 303431. 2.
Bicostate element with two lateral sharp costae
extending to bottom of prominent round base
(slightly broken on right basal corner), USNM
303430; 1,2 both from CC 530 (1,735), X60.
3. Hirsutodontus rams Miller. Element with
poorly developed cusp and nodose ornamentation
(lacking on posterior face and around
basal margin), from CC 455 (1,493), X120,
USNM 303419.
4. Semiacontiodus lavadamensis (M iller).
Element with oval base, two lateral costae
flanked by prominent grooves, and central
posterior costa near tip; faint vertical striae
visible in posterior grooves, from TC 446
(1,460, about 19.2 m 163 f t 1 below top of
Wilberns Formation), x 120, USNM 303428.
5-7. Utahconus tennis Miller, n. sp. 5. Oblique
anterior view of paratype, a bicostate element
with anterior and posterior costae extending to
base of oval cusp, which is bent to right side;
broken tip shows cross section of cusp; USNM
303434.-6. Outer lateral view of paratype,
a bicostate element with acute angle where
posterior costa meets base, USNM 303433.
7. Inner lateral view of holotype, a
bicostate element with acute angle near top of
base, USNM 303432. All from CC 536 (1,756),
all X60.
8,9. Monocostodus sevierensis (Miller). 8.
Basal oblique view showing oval base and
slender posterior costa that ends near bend of
cusp. 9. Lateral view showing costa extending
from near bend of cusp almost to tip;
8,9 from same sample as figure 4, X110,
USNM 303421.
10-12. Semiacontiodus nogamii Miller. 10,11.
Posterolateral (10) and posterior (11) views of
prominently striated, symmetrical, bicostate
element, showing lateral costae and adjacent
grooves, lack of central posterior costa, and
oval basal margin, from CC 567 (1,857),
X 200, USNM 303426. 12. Lateral view of
asymmetrical unicostate element with weak,
broad lateral costa, from CC 465 (1,524),
X 100, USNM 303427.
13. Hirsutodontus simplex (Druce & Jones).
Lateral view of typically ornamented element
with large spines; from same sample as figure
4, X 120, USNM 303289.
14. Hirsutodontus hirsutus Miller. Lateral view of
typically ornamented element with small
nodes; from CC 465 (1,524), X 120, USNM
303418.
15,16. Teridontus nakamurai (Nogami). 15.
Lateral view of slender element X 160. 16.
Enlarged view of base of element in figure 15
showing fine striae typical of several species of
the Teridontus lineage, but only visible on
well-preserved specimens at high magnification;
X560, from TC section, 1.3 m (4 ft)
below top of Wilberns Formation, USNM
303429.