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Publications (35)
The Ediacaran taxon Conotubus hemiannulatus has been discovered in the Terreneuvian blue clays of Estonia. Alongside Conotubus, Gaojiashania-like tubes are also found in these clays. These tubes are fully compressed and pyritized. The well-developed peristomes of Conotubus might have provided stability if the living worm was partially buried in the...
Two new brachiopod–brachiopod symbiotic overgrowths have been discovered from the Kukruse Regional Stage (Sandbian, Ordovician) of Estonia. Both the Philhedra rivulosa–Porambonites sp. and the Petrocrania sp.–Porambonites sp. overgrowths were beneficial to the encrusting craniid and might have been slightly harmful to the host brachiopod. The crani...
The Upper Silurian exposures on Saaremaa Island, mostly represented by small coastal cliffs, are the best in Estonia. Among these exposures are two coastal cliffs that are in many ways unique. The Pridoli crinoid fauna at Kaugatuma and the Ohesaare cliffs contains several endemic genera such as Methabocrinus, Saaremaacrinus, and Velocrinus, which o...
Four species of thick-walled, free-living tentaculitids occur in the Silurian of Estonia with a stratigraphic range from the Wenlock to Pridoli. Seretites versablilis Larsson, 1979 and Tentaculites gothemensis Larsson, 1979 characterize the Jaagarahu Regional Stage (upper Sheinwoodian). There are also two species in the Pridoli of Estonia: Tentacul...
A new type of shell damage has been described in Ordovician brachiopods in Porambonites (Porambonites) laticaudata. There is a pair of small pits with somewhat different outline in the shell surface at the anterior commissure of the brachiopod. These pits are oriented in lateral direction, about 40 o from the direction of the sulcus on the anterior...
Valves of the strophomenid brachiopod Sowerbyella tenera are often encrusted by trepos-tome bryozoan colonies in the lower Katian of Estonia. In some cases, the encrustation of Sowerbyella likely took place syn vivo. A single Sowerbyella tenera contains three Palaeosabella prisca borings that were bored post mortem into the interface between the en...
A new bioclaustration of a symbiont is here described from the mantle cavity of the strophomenatan brachiopod Clitambonites schmidti. It is the second bioclaustration in brachiopods known from the Kukruse Regional Stage (Sandbian) of Estonia. It shares affinities with the bioclaustrations Burrinjuckia and Haplorygma. The outgrowth in the ventral va...
Multiple calcareous worm-like boring casts occur on the inner surface of the calcitic external layer of the bivalve Leptodesma sp. from the Kaugatuma Formation (lower Přídolí, Upper Silurian) of Saaremaa Island, Estonia. Most of the boring casts are oriented with their apertures towards the posterior margin of Leptodesma sp. The worm-like casts wer...
Rare Oichnus simplex drill holes occur in mature obolid shells from the Cambrian/Ordovician boundary beds of northern Estonia (Iru and Ülgase) and the uppermost Cambrian of NW Russia (Lava River). The drill holes are significantly more common in the central rather than the marginal regions of the obolid valves. Drilling predators attacked Ungula in...
A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two species; Catalanispira reinwaldti (Öpik, 1930) from the Middle Ordovician Kõgekallas Formation (Darriwilian) of Estonia and Catalanispira plattevillensis n. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morpholo...
Coprolites (fossil faeces) constitute a group of soft sediment trace fossils that provide useful palaeoecological and sedimentological information, but have generally low preservational potential. In this paper we report abundant occurrence and high
diversity of small faecal pellets preserved inside different shelly fossils from Middle and Upper Or...
Coprolites (fossil faeces) constitute a group of soft sediment trace fossils that provide useful palaeoecological and sedimentological information, but have generally low preservational potential. In this paper we report abundant occurrence and high diversity of small faecal pellets preserved inside different shelly fossils from Middle and Upper Or...
Studying deep time biodiversity and environments is largely based on collections of fossils and sedimentary rocks, and the information acquired thereof. The sedimentary bedrocks of Estonia and neighbouring areas constitute a well-preserved archive of Earth history from the late Precambrian to the Devonian period. This interval of geological time ho...
This is the first report of encrusted cryptic surfaces in the Ordovician of Estonia. Only bryozoans and cornulitids occurred in nautiloids and trilobites. Bryozoans were the dominant encrusters, in terms of both the number of specimens and the encrustation area. Stalked echinoderms are common on the hardgrounds in the Middle and Upper Ordovician of...
The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids...
The biogeographical distribution of Ordovician and Silurian gastropods, monoplacophorans and mimospirids has been analysed on a generic level. The dataset contains 334 genera and 2769 species, yielding 1231 records of genera with 2274 occurrences worldwide. There is a bias towards eastern Laurentia, Baltica and Perunica records. Some 53.1% of the r...
The problematic fossil Anticalyptraea Quenstedt, 1867, traditionally interpreted as a phorid gastropod, is here assigned to the Class Tentaculita. Its dextrally coiled substrate-cemented tube, bulbous initial chamber, vesicular tube wall and pseudopunctate microlamellar shell structure closely resembles Trypanopora (Tentaculita), but Anticalyptraea...
Discosorid and oncocerid cephalopods of the Kunda and Aseri Regional Stage (Darriwilian, Middle Ordovician) from Öland Island, Sweden and North Estonia are described for the first time. We demonstrate that a high generic and specific diversity of Oncocerida was already established in the earliest Darriwilian. The new oncocerid species Neumatoceras...
Pleurotomaria? kunda Öpik, 1926 was correctly referred to the genus Aldanella Vostokova, 1962 more than 30 years ago, although its affinities are still debated. It has been described by several authors as a gastropod on account of its helically coiled shell but it is here referred to the Class Helcionel-loida, a group of Cambrian-Ordovician untorte...
The annulated orthoceridans of the Middle and Late Ordovician of Baltoscandia are described and their systematic frame is revised. The revision of these nautiloids, which are part of the Orthocerida and Pseudorthocerida, is based on the investigation of characters of the septal neck, the siphuncular tube, and the apex. An unequivocal terminology of...
The annulated orthoceridans of the Middle and Late Ordovician of Baltoscandia are described and their systematic frame is revised. The revision of these nautiloids, which are part of the Orthocerida and Pseudorthocerida, is based on the investigation of characters of the septal neck, the siphuncular tube, and the apex. An unequivocal terminology of...
Kurzfassung Sieben Arten vonBucania
Hall 1847 aus dem Ordoviz von Estland werden, unter Berücksichtigung von Geschiebe-Material aus Deutschland, vorgestellt, und
ihre stratigraphische und geographische Verbreitung wird revidiert. Die mittelordovizischen ArtenBucania latissima
Koken 1897 undBucania salpinx
Koken 1897 werden versuchsweise zuMegalomph...
Redescription of the gastropod Euomphalus undiferus Schmidt, 1858 from the Upper Llandovery Rumba Formation of Estonia requires reinvestigation of the hitherto monotypic genus Kiaeromphalus Peel & Yochelson, 1976, originally described from the Rytteråker Formation of the Oslo Region. The Estonian K. undiferus and the Norwegian type species occur in...
The helcionelloid mollusc Anabarella was recently found from the Kestla Member of the Lontova Formation in the Vanamoisa F-149 core at a depth of 123 m. The appearance of Early Cambrian molluscs Aldanella and Anabarella in Estonia was connected with the maximum expansion of the Cambrian palaeobasin on the East European Platform. In the Lontova Stag...
Mimospira puhmuense n. sp. is described from the Rägavere Formation (Rakvere Stage; Late Caradocian) of Estonia and is only the second representative of the genus from the Estonian Ordovician. Mimospira puhmuense is a characteristic sinistrally coiled member of the problematic molluscan group Onychochiloidea, variously referred to the classes Gastr...
A platyceratacean gastropod species Cyclonema (Cyclonema) hiiumaa Teichert, 1928 is redescribed. The distribution and life habits of this species are discussed. -Author
Bivalves of the Silurian of Podolia and the Baltic are represented by about 50 species. Variability and occurrence of these taxa in deposits of various facies are described. Bivalves are mostly considered to be environmentally controlled fauna, providing a good basis for facies analysis. The composition of infaunal, endobyssate and epibyssate group...
The taxonomic composition and some morphological features of bivalves from different facial zones are described. East Baltic and Podolian Wenlock associations have little in common. The highest variety of bivalves is observed in Ludlow, especially in shallow shelf facies. A comparison of bivalve associations from Podolia and East Baltic shows a num...
