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1

Pelagic chondrichthyan microremains from the Upper Devonian of the Kale Sardar section, eastern Iran

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Hairapetian V. , Ginter M.

Acta Geologica Polonica

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2010

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tom Vol. 60, no. 3

357-371

EN

An assemblage of fifteen taxa of chondrichthyan microremains from late Frasnian through late Famennian pelagic deposits of the Kale Sardar section, eastern Iran, is described. Several taxa (Phoebodus bifurcatus, Phoebodus sophiae and Protacrodus vetustus) are reported for the first time from Iran. The presence of Deihim mansureae and Ph. sophiae in the Late rhenana to linguiformis Zones and Phoebodus rayi in the early triangularis Zone of the Kale Sardar section, provides new biostratigraphic information. The late Frasnian part of the assemblage corresponds to the faunas from the intrashelf basins of central europe, and the middle.late Famennian part is comparable to that from the tafilalt Platform of Morocco.

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Famennian chondrichthyan remains from the Chahriseh section, central Iran

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Hairapetian V. , Ginter M.

Acta Geologica Polonica

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2009

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tom Vol. 59, no. 2

173-200

EN

A diverse shallow water assemblage of chondrichthyan microremains is described from the Famennian of the Chahriseh section, central Iran. Twenty-two taxa are identified; of these two new taxa viz. Roongodus phijani gen. et sp. nov. (Hybodontoidea) and Arduodens flammeus gen. et sp. nov. (Ctenacanthiformes) have been erected. Two morphoecological subtypes of Ph. gothicus dentition, characteristic of deeper and shallower shelves, are proposed.

3

Early Frasnian sharks from central Iran

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Hairapetian V. , Ginter M. , Yazdi M.

Acta Geologica Polonica

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2008

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tom Vol. 58, no. 2

173-179

EN

Two limestone bone-beds in the early Frasnian of the Chahriseh section, central Iran, yielded numerous chondrichthyan teeth and scales. The fauna includes, most probably, only two taxa: a hitherto unknown aztecodontid omalodontiform, Manberodus fortis gen. et sp. nov., and a multicuspid phoebodontiform, provisionally referred to as Phoebodus cf. latus GINTER & IVANOV, 1995.Anew omalodontiform family, Aztecodontidae, including Aztecodus LONG& YOUNG, 1995 and Manberodus gen. nov., is proposed.

4

Visean and Bashkirian ammonoids from Central Iran

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Hairapetian V. , Korn D. , Bahrami A.

Acta Geologica Polonica

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2006

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tom Vol. 56, no. 3

229-240

EN

Two successions of Carboniferous sedimentary rocks in Central Iran yielded ammonoid assemblages from one horizon each. In the Ramsheh section, a siltstone with Neoglyphioceras yazdii n. sp. and Dombarites can be assigned to the latest Visean. The assemblage from the Shesh Angosht Mountain is more diverse with species of the genera Proshumardites, Eumorphoceras, Homoceras, Glaphyrites, Syngastrioceras, and Dombarocanites. This is the first time that the co-occurrence of the genera Eumorphoceras and Homoceras has been recorded. This fauna contains elements of the South Urals and Central Asian occurrences of Bashkirian ammonoids and suggests close palaeobiogeographic relationships.

5

A new early Silurian prioniodontid conodont with three P elements from Iran and associated species

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Mannik P. , Miller C. G. , Hairapetian V.

Acta Palaeontologica Polonica

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2015

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tom 60

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nr 3

EN

A prioniodontid conodont Arianagnathus jafariani gen. et sp. nov. from the late Llandovery part of the Niur Formation of the Derenjal Mountains, East Central Iran had an apparatus bearing 3 pairs of P elements. Pa elements of its apparatus are closest to those of Icriodella sandersi (Llandovery-Wenlock boundary interval, Wales, Great Britain) in the weak development of an icrion. Due to the small sample size not all S-elements have been identified but those present are similar to those described in the Icriodella and Icriognathus apparatuses. Based on similarities with previously described apparatus Notiodella we suggest that Arianagnathus jafariani gen. et sp. nov. probably had an apparatus of 17 elements. Arianagnathus is therefore an important additional example that has potential for aiding the future revision of the palae-obiological arrangement of elements within and the phylogeny of conodont apparatuses with 3 P elements, one of which is icrion bearing. The completely known apparatus of associated Ozarkodina derenjalensis sp. nov. shows similarity to some unnamed Ozarkodina from Wales, Great Britain. Many of the conodonts found in the Llandovery part of the studied section are cosmopolitan; the new conodont species seem to have their possible closest relatives in Avalonia.

6

Chondrichthyan microfossils from the Famennian and Tournaisian of Armenia

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Ginter M. , Hairapetian V. , Grigoryan A.

Acta Geologica Polonica

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2011

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tom Vol. 61, no. 2

153-173

EN

The assemblages of chondrichthyan microremains from the Famennian of Armenia show great resemblances to those from central Iran. Particularly, the very rich sample (almost 200 teeth) from the lower Famennian of Ertych contains a fauna similar to that from the Iranian section of Hutk, and the sample from the upper Famennian of Khor Virap has its counterpart in the sample from Dalmeh, Iran. Only one chondrichthyan taxon definitely unknown from Iran, Ertychius intermedius gen. et sp. nov., was recorded. The other newly described species, Lissodus lusavorichi sp. nov., was noted earlier from Dalmeh, but at that time was left unnamed. It appears that the same type of relatively shallow marine environment predominated in the central and north-western parts of the Iranian Platform during the Famennian and that in a given time-interval the same type of ichthyofauna was distributed throughout the area. The single lower Tournaisian sample from the Sevakavan section yielded a peculiar form of thrinacodont teeth, possibly intermediate between Thrinacodus tranquillus and Th. ferox.

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A new, unusual rhynchonellide brachiopod with a strophic shell from the Sirurian of Iran

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Popov L. E. , Hairapetian V. , Pour M. G. , Modzalevskaya T. L.

Acta Palaeontologica Polonica

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2015

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tom 60

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nr 3

EN

A new, unusual rhynchonellide brachiopod Jafarirhynchus alatus assigned to the newly established family Jafarirhynchidae is described from the Silurian (Telychian) of the Boghu Mountains in east-central Iran. It forms a low diversity association with the spiriferide Striispirifer? ocissimus, which exhibits well preserved calcified brachial supports. A strophic shell, well-developed ventral interarea and liberosessile mode of life make this taxon unique among Palaeozoic rhynchonellide brachiopods. In spite of a superficial similarity to spiriferides and the atrypide family Davidsonioidea, Jafarirhynchus retains the typical rhynchotrematoid cardinalia with a septalium supported by the median septum, a septiform cardinal process and long, raduliform crura. It is considered as an offshoot of the local lineage, which includes two successive species of Stegocornu (family Rhynchotrematidae) which proliferated in Central Iran and adjacent Afghanistan during Aeronian time.

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Early Frasnian acanthodians from Central Iran

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Hairapetian V. , Valiukevicius J. , Burrow C. J.

Acta Palaeontologica Polonica

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2006

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tom 51

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nr 3

EN

Two vertebrate−bearing horizons in the basal Frasnian carbonate of the Chahriseh section, northeast of Esfahan, yielded microremains of thelodonts, placoderms, acanthodians, actinopterygians, chondrichthyans, and sarcopterygians, considerably expanding the vertebrate faunal list for the strata. Acanthodians comprise a diverse association of climatiids, diplacanthids, and ischnacanthiforms, including the previously recorded climatiid Nostolepis sp. cf. N. gaujensis, as well as one new climatiid genus and several taxa left in open nomenclature. Climatiid Iranolepis ginteri gen. et sp. nov. is diagnosed by having scales with a highly raised medial crown area separated by steep slopes from lateral crown areas; an odontocytic mesodentine of maximum extent in the crown, distinguished by extensive network of fine canaliculi with abundant tiny osteocytes; and a poorly developed stranggewebe system. Other scales with fan−like symmetrically grooved crowns conform to the Diplacanthus−type histologically, and have many characters in common with Milesacanthus antarctica from the Aztec Siltstone of Antarctica. Osseous gnathal elements include mesodentinous tooth whorls from an ischnacanthiform or climatiid, and ischnacanthiform jaw bones with large chambers for vascular canals, distinctly separated cylindrical tooth cusps along the lingual ridge, and wide−based, triangular, weakly striated cusps on the main lateral ridge. The acanthodian association, accompanied by the Frasnian conodonts of the middle Mesotaxis falsiovalis to Palmatolepis hassi zones and zonal thelodonts Turinia hutkensis and Australolepis seddoni, is proving useful for biostratigraphy, showing similarities with assemblages from both Gondwana and the Old Red Sandstone Continent.

9

Famennian chondrichthyans from the shelves of North Gondwana

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Ginter M. , Hairapetian V. , Klug C.

Acta Geologica Polonica

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2002

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tom Vol. 52, nr 2

169-215

EN

Ichthyoliths, mainly shark teeth, from the Famennian of Iran and Northwest Africa are described. Evolution of shallow-water chondrichthyan assemblages on the shelves of Central Iran and the Tafilalt Platform, Morocco, related to time and environmental changes, is discussed. Four new taxa, viz. Deihim mansureae gen. et sp. nov. Protacrodus serra sp.nov., Phoebodus depressus sp. nov., and Ph. gothicus transitans subsp. nov. are erected and provisional reconstructions of heterodonty in dentitions of several Famennian sharks are proposed.

10

Silurian thelodonts from the Niur Formation, central Iran

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Hairapetian V. , Blom H. , Miller C. G.

Acta Palaeontologica Polonica

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2008

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tom 53

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nr 1

EN

Thelodont scales are described from the Silurian Niur Formation in the Derenjal Mountains, east central Iran. The material studied herein comes from four stratigraphic levels, composed of rocks formed in a shallow water, carbonate ramp environment. The fauna includes a new phlebolepidiform, Niurolepis susanae gen. et sp. nov. of late Wenlock/?early Ludlow age and a late Ludlow loganelliiform, Loganellia sp. cf. L. grossi, which constitute the first record of these thelodont groups from Gondwana. The phlebolepidiform Niurolepis susanae gen. et sp. nov. is diagnosed by having trident trunk scales with a raised medial crown area separated by two narrow spiny wings from the lateral crown areas; a katoporodidtype histological structure distinguished by a network of branched wide dentine canals. Other scales with a notch on a smooth rhomboidal crown and postero−laterally down−stepped lateral rims have many characters in common with Loganellia grossi. Associated with the thelodonts are indeterminable acanthodian scales and a possible dentigerous jaw bone fragment. This finding also provides evidence of a hitherto unknown southward dispersal of Loganellia to the shelves of peri−Gondwana.

11

Silurian stratigraphy of Central Iran - an update

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Hairapetian V. , Ghobadi Pour M. , Popov L. E. , Männik P. , Miller C. G.

Acta Geologica Polonica

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2017

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tom Vol. 67, no. 2

201--233

EN

The Silurian biostratigraphy, lithostratigraphy, and facies of Central Iran including the Kashmar (Boghu Mountains), Tabas (Derenjal Mountains, Ozbak-Kuh), Anarak (Pol-e Khavand) and Kerman regions is reviewed and updated. The current state of knowledge of the Silurian in the Zagros Basin, Alborz, Kopet-Dagh and Talysh regions, as well as in a few areas scattered across the Sabzevar Zone, and the Sanandaj-Sirjan terranes is also reviewed. Silurian volcanism in various parts of Iran is briefly discussed. The end of the Ordovician coincided with a widespread regression across Iran synchronous with the Hirnantian glaciation, and only in the Zagros Basin is there a continuous Ordovician–Silurian transition represented by graptolitic black shales of the Sarchahan Formation. In the Central-East Iranian Platform marine sedimentation re-commenced in the early to mid Aeronian. By the Sheinwoodian, carbonate platform depositional environments were established along its north-eastern margin. In other parts of Iran (e.g., Kopet-Dagh and the Sabzevar Zone), siliciclastic sedimentation continued probably into the late Silurian. The Silurian conodont and brachiopod biostratigraphy of Central Iran is significantly updated facilitating a precise correlation with the Standard Global Chronostratigraphic Scale, as well as with key Silurian sections in other parts of Iran. The Silurian lithostratigraphy is considerably revised and two new lithostratigraphical units, namely the Boghu and Dahaneh-Kalut formations, are introduced.

12

Review of the Ordovician stratigraphy and fauna of the Anarak Region in Central Iran

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Popov L. E. , Hairapetian V. , Evans D. H. , Ghobadi Pour M. , Holmer L. E. , Baars C.

Acta Geologica Polonica

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2015

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tom Vol. 65, no. 4

403--435

EN

The Ordovician sedimentary succession of the Pol-e Khavand area, situated on the northern margin of the Yazd block, has important differences from those in other parts of Central Iran. It has been established that the presumably terminal Cambrian to Lower Ordovician volcano-sedimentary Polekhavand Formation, exposed in the Pol-e Khavand area, has non-conformable contact with greenschists of the Doshakh Metamorphic Complex. The succeeding, mainly siliciclastic Chahgonbad Formation contains low to moderately diverse faunal assemblages, including brachiopods, cephalopods, trilobites and tentaculitids. The Darriwilian age of the lower part of the formation is well established by the co-occurrence of brachiopod genera Camerella, Phragmorthis, Tritoechia and Yangtzeella. The associated rich cephalopod fauna is different from the Darriwilian cephalopod associations of the Alborz terrane and may show some affinity with warm water faunas of North China and South Korea. It is likely that the Mid Ordovician fauna recovered from the lower part of the Chahgonbad Formation settled in the area sometime during a warming episode in the late Darriwilian. By contrast the low diversity mid Katian brachiopod association includes only three taxa, which occur together with the trilobite Vietnamia cf. teichmulleri and abundant, but poorly preserved tentaculitids questionably assigned to the genus Costatulites. This faunal association bears clear signatures linking it to the contemporaneous cold water faunas of the Arabian, Mediterranean and North African segments of Gondwana. Four brachiopod species recovered from the Chahgonbad Formation, including Hibernodonta lakhensis, Hindella prima, Lomatorthis? multilamellosa and Yangtzeella chupananica are new to science.