GEOLOGIJA 31, 32, 219-224 (1988/89), Ljubljana
UDK 56.61.62.02.551.761(497.12) = 20
New ostracod and conodont species from the Triassic strata of
Slovenia
(NW Yugoslavia)
Nova ostrakodna in konodontna vrsta iz triasnih plasti Slovenije
(NW Jugoslavija)
Tea Kolar-Jurkovšek
Geološki zavod Ljubljana, Dimičeva 14, 61000 Ljubljana
Abstract
A new ostracod species Polycope ladinica n. sp. from the Ladinian beds of the
Julian Alps, and new conodont species Neogondolella celeiana n. sp. from the
Langobardian-Cordevolian beds occurring near Celje, are described.
Kratka vsebina
Opisani sta dve novi vrsti: ostrakodna Polycope ladinica n. sp. iz ladinijskih
piasti Julijskih Alp in konodontna Neogondolella celeiana n. sp. iz langobardsko-
-cordevolskih piasti pri Celju.
The extensive investigations of the isolated Triassic microfauna of Slovenia
resulted among other achievements in finding of a new ostracod and a new conodont
species.
The new ostracod species Polycope ladinica n. sp. is distinguished by fine
irregular reticulation on the external surface of the valve. Besides ostracods and
conodont fragments, the rich microfauna consists of numerous radiolaria among
which a new genus and five new species have been described (Kolar-Jurkovšek,
1989 a). The similarity of the microfossil assemblage-radiolaria mainly - of the
Gorenja Trenta with that of the Pokljuka section allows the conclusion that the same
stratigraphie level is probably in question: the trammeri conodont zone encompas-
sing the upper part of the Fassanian and the lower and the middle part of the
Langobardian substages {"Protrachyceras" curionii, Gymnoceratites? poseidon and
Meginoceras meginae ammonoid zones) (Kolar-Jurkovšek, 1989b).
The small and medium size elements of the Neogondolella celeiana n. sp. are
nearly flat with the posterior part only slightly produced downwards. The low carina
consists of isolated denticles. The cusp is the strongest and bent posteriorly; behind it
220_Tea Kolar-Jurkovšek
is another thorn-like denticle. This conodont species occurs in the Langobardian-
-Cordevolian/oíiaía conodont zone (Macleamoceras macleami and Frankites suther-
landi ammonoid zones) of the two localities near Celje. The microfossil assemblages
of two find-spots consist, among others, of: Epigondolella baloghi (Kovacs), E. most-
leri Kozur, E. mungoensis (Diebel), Gladigondolella malayensis Nogami, G. tethydis
(Huckriede) and Neogondolella foliata foliata (Budurov) (Kolar-Jurkovšek,
1989b).
Genus   Poly cope Sars 1866
Polycope ladinica n. sp.
Fig. 1
Derivatio nominis: Named after its stratum typicum.
Holotypus: Fig. 1, sample BE 8832b (1893), Ljubljana Geological Survey .
Locus typicus: Gorenja Trenta.
Stratum typicum: Ladinian beds.
Material: Twelve valves from Gorenja Trenta BE 8832b (1893).
Diagnosis: Subrounded valves with fine, irregular reticulations.
Description: Small valves are subround in lateral outline, greatest width is in
the median area. The surface has fine reticulated microstructure; polygonal network
of the median portion of the valve is surrounded by elongated reticulations. The
hinge structure is not determinable in the specimens on hand.
Relations: According to Kozur (1972) the genera Discoideíía, Polycopsis and
Polycope are difficult to be distinguished one from another. The P. levis and the
P. hungarica have been initially assigned to the genus Polycopsis (Kozur, 1970);
however the specimens of the latter species have been later illustrated as D. hunga-
rica (Kozur, 1972; Taf. 1. Fig. 8).
Small difference between the genera Polycope and Polycopsis was pointed out by
Ulrichs (1972, 695) as well; he assigned the Triassic specimens to the genus
Polycope in the same way as originally described by Appostolescu (1959). Conse-
quently, the new species from Slovenia has been attributed to this genus.
The surface ornament of this species is distinguished from the other in the genus,
which is marked by fine irregular reticulations. The shell surface appears to be
smooth in P. levis (Kozur), but is characterized by distinct ribbing in P. hungarica
(Kozur) and P. cincinnata Appostolescu.
Genus   Neogondolella Bender & Stoppel 1965
Neogondolella celeiana n. sp.
PI. 1, Figs. 1-3
Derivatio nominis: According to its finding in the vicinity of Celje (Celeia is
the Latin name of the Celje town).
Holotypus: PI. 1, figs. 2a-d, sample CE/l-2b (1788), Ljubljana Geological
Survey.
Paratypus: PI. 1, figs. 1 a-c, 3a-c, sample CE/l-2b (1788, 1858), Ljubljana
Geological Survey.
Stratum typicum: BedCE/l-2b, {Neogondolella foliata - R.Z.).
Locus typicus: Škrjanec near Celje.
Material : Thirteen specimens from Škrjanec CE/l-2b, d (1858, 1788) and three
from Straža CE/2-5, CE/2-2, CE/2-1 (1863, 1856, 1860).
New ostracod and conodont species from the Triassic...
221
Fig. 1-SI. 1
Polycope ladinica n. sp.
Holotype. Ladinian stage - ladinijska stopnja, Gorenja
Trenta BE 8832 b (1893), 150 x
Photo by - Foto J. Rode (Institute of Biology, Ljubljana)
Diagnosis: Small to medium sized, almost straight element. Platform develo-
ped along most of the elements' length; it terminates just before the anterior and
posterior edges. Low carina composed of low isolated denticles. Short free blade,
cusp enlarged. Keel fairly narrow and high. Small basal pit surrounded by large loop.
Description: The unit is practically straight in lateral view, only the posterior
part behind the pit is slightly inclined downwards. Platform is well developed in the
central part, it tapers gradually toward the posterior and anterior edges leaving one
or two denticles free at each edge. Platform widest near the center. Lateral margins
of platform considerably thick with honeycomb structure at upper surface. Width to
length ratio about 1:3.5. Entire unit length is totaling 0.34 to 0.58mm, width 0.10 to
0.18mm and height 0.10 to 0.23mm.
The carina is low, but it nevertheless decreases in the center, composed of six to
nine denticles. Denticle next to the posterior one is largest and projecting posteriorly.
Posterior spine-like denticle is posteriorly inclined and asymmetrically located.
The underside is characterized by a narrow and high keel with deeply excavated
groove. Terminally located pit is ovaloid and surrounded by flaring loop.
Relations: A morphologic relatioship exists with N. shoshonensis Nicora,
especially in the development of the platform. The new form shows affinities with
N. constricta (Mosher & Clark) in the platform shape and low, in the central portion
decreased carina. N. celeiana n. sp. is distinguished from N. constricta in looplike
extensions and its pointed posterior edge. N. celeiana n. sp. may have developed from
N. constricta, what can be infered from small-sized unit and significant cusp. In
evolution of the Triassic Neogondolella major changes took place at the posterior
222 Tea Kolar-Jurkovšek
Plate 1 - Tabla 1
Neogondolella celeiana n. sp.
2a-c   holotvpe.   Neogondolella  follata   -   R.   Z.   (Langobardian-Cordevolian),   Škrjanec
CE/l-2b (1858)
Magnifications 100 x except figs. 1 c 300 x, 2 b 200 x, 3 c 220 x and 3 d 320 x
Povečave 100 x razen si. i c 300 x, 2 b 200 x, 3 c 220 x m 3d 320 x
Photo by - Foto M. Jakupović (Institute of Metallurgy, Ljubljana)
part of the elements which lead into reduction of the posterior denticle, and is formed
as posteriorly inclined spine in new species.
Distribution: This species is represented in the Langobardian-Cordevolian
beds (foliata - R. Z.) of Škrjanec and Straža near Celje.
Nova ostrakodna in konodontna vrsta iz triasnih plasti Slovenije
Povzetek
V sklopu obsežnih raziskav izolirane triasne mikrofavne Slovenije sta bili najdeni
po ena nova ostrakodna in konodontna vrsta.
Ostrakodno vrsto Polycope ladinica n. sp. označuje nežna nepravilna retikulacija
na zunanji površini lupine. Bogato mikrofavno poleg ostrakodov in konodontnih
fragmentov sestavljajo tudi številni radiolariji, izmed katerih je opisan en novi rod in
pet novih vrst (Kolar-Jurkovšek, 1989a). Zaradi podobnosti mikrofosilne
združbe, predvsem radiolarijev iz Gorenje Trente z združbo v profilu na Pokljuki
sklepam, da gre verjetno za isti stratigrafski nivo, to je trammeri konodontno cono, ki
obsega zgornji del fassanske in spodnji ter srednji del langobardske podstopnje
(amonitne cone »Protrachyceras« curionii, Gymnoceratites? poseidon in Meginoceras
meginae) (Kolar-Jurkovšek, 1989b).
Majhni do srednje veliki elementi vrste Neogondolella celeiana n. sp. so skoraj
ravni, le zadnji del je nekoliko upognjen navzdol. Nizko karino sestavljajo izolirani
zobje. Kusp je najmočnejši in usmerjen nazaj, za njim stoji še en trnu podoben zob. Ta
konodontna vrsta se nahaja v langobardsko-cordevolski foliata konodontni coni
(Maclearnoceras maclearni in Frankites sutherlandi amonitni coni) dveh nahajališč
pri Celju. Mikrofosilni združbi obeh nahajališč poleg drugih sestavljajo še: Epigondo-
lella baloghi (Kovacs), E. mostleri Kozur, E. mungoensis (Diebel), Gladigondolella
malayensis Nogami, G. tethydis (Huckriede) in Neogondolella foliata foliata (Budu-
rov) (Kolar-Jurkovšek, 1989b).
New ostracod and conodont species from the Triassic...
223
224 Tea Kolar-Jurkovšek
References
Appostolescu, V. 1959, Ostracodes du Lias du Bassin de Paris. Rev. Inst. Franc. Pétrole,
6, 795-826, 4, Pl., Paris.
Kolar-Jurkovšek, T. 1989a, New radiolaria from the Ladinian substage (Middle
Tnassic) of Slovenia (NW Yugoslavia). N. Jb. Geol. Paläont. Mh., 3, 155-165, 3 text-figs.,
Stuttgart.
Kolar-Jurkovšek, T. 1989 b, Mikrofavna srednjega in zgornjega triasa Slovenije in njen
biostratigrafski pomen. Geologija, 33, (in print).
Kozur, H. 1970, Neue Ostracoden-Arten aus dem obersten Anis des Bakony-hochlandes
(Ungarn). Ber. Nat. - Med. Ver. Innsbruck, 58, 384-428, 4 Taf., Innsbruck.
Kozur, H. 1972, Die Bedeutung triassischer Ostracoden für stratigraphische und paläo-
ökologische Untersuchungen. Mitt. Ges. Geol. Bergbaustud., 21, 623-660, 2 Tab., 3 Taf.,
Innsbruck.
Ulrichs, M. 1972, Ostracoden aus den Kössenner Schichten und ihre Abhängigkeit von
der Ekologie. Mitt. Ges. Geol. Bergabustud., 21, 661-710, 8, Abb., 4 Taf., Innsbruck.