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Dyctionellida, Brachiopoda) from NW Serbia

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Dyctionellida, Brachiopoda) from NW Serbia GEOLO[KI ANALI BALKANSKOGA POLUOSTRVA 65 (2002–2003) 47–53 BEOGRAD, decembar 2004 ANNALES GÉOLOGIQUES DE LA PÉNINSULE BALKANIQUE BELGRADE, December 2004 A new Carboniferous species of Isogramma (Dyctionellida, Brachiopoda) from NW Serbia SMILJANA STOJANOVI]-KUZENKO Abstract. Representatives of a new Early Moscovian, Carboniferous, species of the dictionelid brachiopod Isogramma MEEK & WORTHEN, 1870 from northwestern Serbia are described. Small dimensions, weakly devel- oped dorsal lateral ridges and the absence of dorsal anterior sulcus characterize this new taxon. A comparison with other representatives of genus Isogramma and some remarks of this genus are given. Keywords: Brachiopods, Isogrammidae, Early Moscovian, Carboniferous, NW Serbia, new species. Apstrakt. Opisana je nova vrsta roda Isogramma iz ranog moskovskog kata, karbona, severozapadne Srbije. Glavne karakteristike ove vrste su male dimenzije, slabo razvijeni dorzalni bo~ni grebeni i odstustvo dorzalno predweg sulkusa. Dato je upore|ewe nove vrste sa ostalim predstavnicima ovog roda, kao i neke wegove osobine. Kqu~ne re~i: brahiopodi, Isogrammidae, rani moskovski kat, karbon, SZ Srbija, nova vrsta. Introduction of new representatives of this genus appear sporadical- ly in the literature, many questions remain unanswered: Detailed geological mapping of NW Serbia during the exact function of the internal structure of the ven- the 1960’s and 70’s resulted in the discovery of many tral valve, the question of communication within the new rich faunas of Devonian–Carboniferous boundary valves and with the marine environment in which they conodonts, Carboniferous conodonts, fusulinids and bra- have been lived. The reason for this is the relatively chiopods. The discoveries established the detailed strati- poor preservation of the fossil materials, although every graphy of the region and resulted in numerous publica- new discovery places a new piece in the jigsaw puzzle tions (STOJANOVI]-KUZENKO, 1966–1967; STOJANOVI]- of this unusual group. KUZENKO et al., 1995; ARCHBOLD & STOJANOVI]-KU- The other constituents of the fauna in the locality of ZENKO, 1996). Obradovi}i Hamlet consist of numerous brachiopods One of the most fossiliferous localitites is the Hamlet typical of Early Moscovian (STOJANOVI]-KUZENKO, of Obradovi}i, situated 4.4 km N–NW of Krupanj at the 1966–1967). The assemblage shares many genera with edge of an unsealed road towards the village of Cerova, Early Moscovian faunas of Spain (ARCHBOLD & STOJA- 150 m NW of the trigonometric point 572. All Iso- NOVI]-KUZENKO, 1995; RÍO GARCÍA & MARTÍNEZ CHA- gramma specimens in this locality, as in the majority CÓN, 1988; MARTÍNEZ CHACÓN, 1990, 1991; SÁNCHES DE of other localities, are preserved as moulds and impres- POSADA et al., 1993); links are also to be found with sions. Among this material, a well preserved dorsal val- European Russian faunas. ve (the natural counterpart) was found, and this is pro- The author and her colleagues I. FILIPOVI] and V. posed as a holotype of a new species. The name of this PAJI] revisited the locality several times and found new new species, Isogramma serbica, was earlier introduced material which are presented here as paratypes. The by the author (1966–1967) but without formal descrip- number of Isogramma specimens is low in comparison tion. This is now provided. with the majority of other localities reported elsewhere. As far as the author is aware, this is the first find One poorly preserved specimen of Isogramma was of complete impressions of the interior and exterior of also discovered by the author in the locality Eljdi{te in both valves of this species. Although the descriptions the region of Sana’s Paleozoic of Bosnia (STOJANOVI]-KU- 71 Barracks Rd., Hope Valley, 5001 Adelaide, Australia. E-mail: [email protected] 48 SMILJANA STOJANOVI]-KUZENKO ZENKO, 1966–1967), which is not included in this paper. to its forked end. The length of the notch is two thirds Superfaminiliar classification follows WILLIAMS et al. of the valve (Pl. 1, Fig. 7) or slightly shorter (Pl. 1, Fig. (1996). 13). The platform extends from near the beak (Pl. 1, Figs. 7, 8). A notch divides the platform and forms two triangular symmetrical, posteriorly slightly depressed, an- Taxonomic description teriorly elevated areas with well developed lateral mar- gins extending anteriorly and slightly longer than the Phylum Brachiopoda DUMÉRIL, 1806 notch. A very clear outline of the two triangular parts of Subphylum Rhynchonelliformea WILLIAMS et al., 1996 the platform can be recognised (Pl. 1, Figs. 8, 13). Class Chileata WILLIAMS et al., 1996 The platform is anteriorly curved with channels be- Order Dictyonellida COOPER, 1956 tween radial grooves, which represent muscle scars and Superfamily Eichwaldioidea SCHUCHERT, 1893 reach the lateral margins. The hinge line of the ventral Family Isogrammidae SCHUCHERT, 1929 interior valve is covered by a row of open punctae. The additional interior ridge with shallow furrows which is Genus Isogramma MEEK & WORTHEN, 1870 connected with the hinge line and it would appear that both parts of the platform are hanging from the hinge line Type species: Chonetes? millipunctatus MEEK & WOR- (Pl. 1, Fig. 13). THEN, 1870. The exterior surface of the ventral valve is covered with elevated lines with punctae in the interspaces and Isogramma serbica sp. nov. is interrupted with the posterior part of the notch (Pl. Pl. 1, Figs. 1–13 1, Fig. 9). In some specimens, the notch is of differ- ent length or the whole valve is covered with orna- 1966–67 Isogramma serbica STOJANOVI]-KUZENKO n. sp. – ments. STOJANOVI]-KUZENKO: 230, pl. 1, figs. 8, 9; pl. 2, Dorsal valve. Lateral margins rounded, extend from fig. 1 (nomen nudum). the cardinal process, greatest width just anterior to the 1995 Isogramma serbica STOJANOVI]-KUZENKO sp. nov. hingeline. Exterior ornaments of fine concentric ridges, –STOJANOVI]-KUZENKO, PAJI] & ARCHBOLD: 61, 2–4 per mm in the anterior half of the shell. The inter- 99, pl. 65, figs. 6–6b (nomen nudum). spaces between the ridges contain a great number of 1996 Isogramma serbica STOJANOVI]-KUZENKO – ARCH- small open punctae. The ventral ridges are sometimes BOLD & STOJANOVI]-KUZENKO: 26-27, fig. 2/29 irregular, with disruptions and with variation of ridge (nomen nudum). heights. In case of injury to the valves, the ridges inter- vene in the reparation (Pl. 1, Fig. 11). The interior of Diagnosis. Small species for the genus with weakly de- the dorsal valves is covered by a smaller number of veloped dorsal lateral ridges and no dorsal anterior sulcus. randomly distributed rounded punctae. Weak lateral rid- Derivatio nominis. Name given from the land of Serbia. ges extend from the cardinal process laterally, slightly Locus typicus. Obradovi}i Hamlet, village Cerova shorter than the hinge line (Pl. 1, Fig. 4) The exterior near Krupanj. of the dorsal valve shows a trace of the outline of mus- Stratum typicum. Yellow-tan alevrolites, Vereian Ho- cle scars positioned on the inside of the valve. Muscle rizon, Early Moscovian stage, Carboniferous. scar distinct, located on both sides of the prominent Holotype. Specimen OB100, dorsal valve, exterior and median septum which extends over two thirds of the interior moulds, figured on Pl. 1, Figs. 1, 4, Collection valve length and is enclosed by the buttress plates. of the Institute for Regional Geology and Paleontology, The myophore is monolobate and distinct. The shaft, Belgrade University. which is located anteriorly of the cardinal process, to- Paratypes. Specimens collected at a later date: two gether with buttress plates, supports the myophore. dorsal valves external moulds (OB101, OB103); ventral valve internal moulds (OB104) and natural counterparts of the exterior and interior of two ventral valves Comparison with other species of Isogramma (OB102, OB105). Description. Shell small, the largest specimen is a One of the closest species to I. serbica sp. nov. is I. holotype with a length of 11.0 mm and a width of 22.0 manchoukuensis HATAI & OMURA (1940) from the Mo- mm, transversely sub-eliptical in outline, ventral valve scovian of Northern China. This latter lacks the dorsal convex, dorasal valve shallowly concave. sulcus but possesses coarser external ornaments. The Ventral valve. Posterior outline arched, the greatest shape of the shell is similar and so is the size. The orna- convexity in the umbonal region. The beak does not ex- mentation, however, consists of much broader and round- tend beyond the hinge line. The notch (depressed trian- ed commarginal ridges, from which the anterior margin gular area) with well-defined lateral ridges, is positioned posteriorly, are fewer and widely separated, almost dis- in the central part of the triangular depression and is di- appearing at the lateral margins of the shell and the punc- vided medially by a narrow furrow extending anteriorly tation is hardly visible. I. salteri BRAND (1970) from the A new Carboniferous species of Isogramma (Dyctionellida, Brachiopoda) from NW Serbia 49 Early Carboniferous of Britain, is a less elongated species References of greater cancavo-convexity. I. carinthiaca (AIGNER, 1931) from the Early Carboniferous of Germany is close to a AIGNER, G., 1931. Die Brachiopoden des Karbons von new species in terms of the external ornamentation but Notsch. Mitteilungen des Naturwissenschaftlichen Vereines possesses a distinct, narrow dorsal anterior sulcus. I. mil- für Steiermark, 68: 3–15. lepunctata (MEEK & WORTHEN, 1873), described by VOL- AIGNER, G. & HERITSCH, F., 1931. Das genus Isogramma in GIN (1957) from southern Fergana, is also similar to I. Carbon der Sudalpen. Denkschriften der Akademie der Wis- serbica, but is a larger species. I. pachti (DITTMAR, 1972) senschaften, Mathematisch-naturwissenschaftlichen Klasse, from the Early Carboniferous of the Moscow basin, is of 102: 303–316. similar size and ornamentatation to I. serbica but is ARCHBOLD, N.W. & STOJANOVI]-KUZENKO, S., 1995. strongly concavo-convex, and possesses a sulcus. The Biostratigraphy – Brachiopoda. In: FILIPOVI], I. (ed.), The stratigraphicaly younger forms I. paotechowensis (GRA- Carboniferous of Northwestern Serbia.
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