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Vol 52, No 3 (2018)
- Year: 2018
- Articles: 14
- URL: https://journals.rcsi.science/0031-0301/issue/view/10241
Article
Representatives of the Genus Trochammina (Foraminifera) from the Middle Jurassic of the Arctic and Boreal Regions
Abstract
Representatives of the genus Trochammina are widespread in the Middle Jurassic of Arctic, Boreal, and Subboreal paleobasins. This group is important for stratigraphic and biofacial investigations. Foraminifers of the genus Trochammina, including T. praesquamata Mjatliuk and T. jakovlevae sp. nov. are described in detail.
221-230
231-233
Revision of the Late Paleozoic Family Vidrioceratidae Plummer et Scott (Ammonoidea)
Abstract
This paper provides a review of the evolution of opinions on the composition and history of the development of the family Vidrioceratidae Plummer et Scott, 1937, which played an important role in the Carboniferous–Permian ammonoid biota. The division of the group into subfamilies, for which the generic composition is determined and the morphogenetic trends are reconstructed, is reinterpreted. The status and species composition of the genera Pamirites Toumanskaya and Prostacheoceras Ruzhencev are emended. The familial assignments of the “problematic” genera Leites Bogoslovskaya, 1990, Jilingites Liang, 1982, and Peritrochia Girty, 1908 are revised.
234-244
Ammonites of Tethyan Origin in the Ryazanian Stage of the Russian Platform: Genera Transcaspiites Luppov and Karasyazites gen. nov.
Abstract
This paper presents the results of the study of ammonites of the family Himalayitidae from the Surites spasskensis Zone of the Ryazanian Stage of Central Russia. The new taxa Transcaspiites tscheffkini sp. nov., T. transitionis sp. nov., and Karasyazites gen. nov., with the type species Subalpinites bajarunasi Luppov, are described. The hypothesis that Transcaspiites Luppov originated from the genus Riasanites Spath is proposed. The analysis of the taxonomic composition of ammonites allows the Neocosmoceras–Septaliphoria semenovi regional zone of Mangyshlak to be correlated with the Spasskensis zone of the standard scale of the Ryazanian Stage.
245-254
New Atrypids (Brachiopoda) from the Lower Devonian of Northeast Russia
Abstract
New atrypids are described from the Lower Devonian of Northeast Russia: Musalitinispira, gen. nov. with type species M. dogdensis, sp. nov. (subfamily Atrypinae), Spinatrypina (Spinatrypina) krivensis, sp. nov., and Datnella, gen. nov. with type species D. datnensis (Baranov, 1995) (subfamily Spinatrypinae).
255-264
Shell Microstructure of Rhynchonella loxiae Fischer (Brachiopoda, Rhynchonellida) from the Upper Volgian of Moscow Region
Abstract
The shell microstructure of Late Jurassic rhynchonellids of the family Rhynchonellidae from the boreal basin of the Russian Platform is studied for the first time. The studied rhynchonellids differ in the shell microstructure from the Late Jurassic and Early Cretaceous rhynchonellids of the families Cyclothyrididae, Praecyclothyrididae, Basiliolidae, and Norellidae from the warm-water Mediterranean basin. The revealed peculiarities of shell structure of Rhynchonella loxiae (type species of Rhynchonella) may be added to the diagnosis of Rhynchonella and should be considered in characterizing the family Rhynchonellidae.
265-270
New Data on Carboniferous Xiphosurans (Xiphosura, Chelicerata) of the Donets Coal Basin
Abstract
Descriptions of four xiphosuran species belonging to two genera, Bellinurus Pictet, 1846 and Prestwichianella Woodward, 1918 (currently included in Euproops Meek, 1867), which were described in the 1920s from the Carboniferous of the Donets Coal Basin, are reassessed based on modern knowledge of taphonomy and xiphosuran anatomy. Prestwichianella zalesskii Chernyshev, 1927 is here synonymized under Euproops danae (Meek et Worthen, 1865). New specimens of E. danae and Bellinurus sp. from the Carboniferous of the Donets Coal Basin are considered in view of associated floral and faunal assemblages and comparisons with floras and faunas from some previously described localities containing members of these genera.
271-283
New Ichneumonids (Hymenoptera: Ichneumonidae) from the Lower Cretaceous Khasurty Locality
Abstract
A new species of Ichneumonidae, Amplicella minor sp. nov., is described from the Lower Cretaceous of Transbaikalia (Khasurty locality). The diagnosis of Amplicella mininae Kopylov, 2011 is amended. Ichneumonids from Khasurty are only represented by two genera, Amplicella and Khasurtella, both belonging to the subfamily Tanychorinae. This assemblage seems to be the most basal ichneumonid assemblage ever known.
284-289
Dencyrtus gen. nov. (Hymenoptera, Chalcidoidea, Encyrtidae) from the Late Eocene Danish Amber
Abstract
Based on two females from the Danish amber collection of the Zoological Museum of University of Copenhagen, Dencyrtus vilhelmseni gen. and sp. nov. is described. The antennae of the new genus are very similar in structure to that of Eocencyrtus Simutnik, 2001 from the Rovno and Baltic ambers. However, the presence of the filum spinosum on the linea calva of the forewing disc indicates that it belongs to a different subfamily.
290-293
New Weevils (Coleoptera, Curculionoidea) from the Eocene of the Green River, United States: Part 1
Abstract
New genera, Pseudochirotenon gen. nov. (with the type species P. eocaenicus sp. nov.), Archaeoheilus gen. nov. (type species A. scudderi sp. nov.), Primocentron gen. nov. (type species P. wickhami sp. nov.), and Pseudophaops gen. nov. (type species Otiorhynchus perditus Scudder, 1876), and new species, Pseudochirotenon eocaenicus sp. nov., Perapion rasnitsyni sp. nov., Archaeoheilus scudderi sp. nov., A. ovalis sp. nov., Primocentron wickhami sp. nov., and Eudiagogus vossi sp. nov., from the Early–Middle Eocene of the Green River are described. New combinations of names (Apionion evestigatum (Scudder, 1893), comb. nov., Archaeoheilus packardii (Scudder, 1893), comb. nov., A. provectus (Scudder, 1876), comb. nov., A. deleticius (Scudder, 1893), comb. nov., A. lacoei (Scudder, 1893), comb. nov., Pseudophaops perditus (Scudder, 1876), comb. nov.) are established. The first fossil records of the tribe Ecelonerini from the New World and genus Perapion from the Green River Formation are provided.
294-302
Neogene Deep-sea Smelts (Argentiniformes: Microstomatidae) from the Far East Russia
Abstract
Deep-sea smelts (Argentiniformes: Microstomatidae, Bathylaginae) from the Miocene of Far East Russia (Sakhalin and Urup islands) are described. The specimens described belong to four taxa, one of which is assigned to a new species of the genus Leuroglossus. Like Recent smoothtongues, the new species has thickened medial rays in the caudal fin. The small number of abdominal vertebrae makes the new species similar to the extant southern smoothtongue L. stilbius, which occurs along the eastern coasts of the Pacific Ocean. The new species differs from extant smoothtongues in the short snout, which is not longer than the orbit. Phylogenetic analysis of morphological features of the new species, using a matrix of characters of living deepsea smelts, shows that it occupies a basal position in the genus Leuroglossus. Three other extinct taxa cannot be reliably classified below the level of the subfamily Bathylaginae or tribe Bathylagini because of insufficient preservation of available specimens. The new records of deep-sea smelts in Far East Russia show that this fish subfamily was widespread and highly morphologically differentiated in the Neogene.
303-319
First Record of Fossil Ghost Pipefish (Solenostomidae, Gasterosteiformes) in Russia
Abstract
A skeleton of a ghost pipefish (Solenostomidae) from the Pshekha Subformation of the Khadum Formation (Lower Oligocene) in the Republic of Adygea was discovered. This is the first fossil record of Solenostomidae in Russia; moreover, it is the only ghost pipefish found in the Oligocene. To date, only two fossil solenostomid genera and species from the Eocene of Monte Bolca (Italy) have been recorded. The only Recent genus of this family, Solenostomus Lacepède, 1903, contains four species. The new specimen is incompletely preserved; it lacks a fragment of the body and some fins, precluding the establishment of genus and species of this form. However, the unique geographical position and age of the new fossil expand our knowledge of the evolution and geographical range of the family Solenostomidae.
320-327
Craniology of the Plesiosaur Abyssosaurus nataliae Berezin (Sauropterygia, Plesiosauria) from the Lower Cretaceous of the Central Russian Platform
Abstract
Cranial bones of the plesiosaurus Abyssosaurus nataliae Berezin, 2011 from the Upper Hauterivian (Lower Cretaceous) of Chuvashia are described. It differs from other known Cryptoclididae in the evident pedomorphic characters in the skull structure. The skull is strongly hypertrophic; the visceral part is shortened relative to its large occipital region; the orbits are enlarged, the lower jaw is narrow. The jugal is well developed, positioned vertically, and borders most of the posterior orbital wall. This skull structure is evidence of deepwater mode of life. The species diagnosis is revised.
328-341
Devonian Spores of Kryshtofovichia africani Nikitin (Tracheophyta): Morphology and Ultrastructure
Abstract
The morphology and ultrastructure of spores of the Devonian plant Kryshtofovichia africani Nikitin are examined. The structure of ultrathin exine megaspores of K. africani is established. The exine consists of two layers: granular ectexine and lamellate endexine. Microspores have a lamellate ultrastructure with a trend toward loosening and formation of the granular structure towards the ectexine outer part. Heterospory of K. africani is apparent in both morphological characters and sporoderm ultrastructure of micro- and megaspores.
342-349