Nº 2 (2023)

The problems of taxonomy of Permian pectinoid bivalves are briefly considered in the context of the study well-known Upper Paleozoic genus Streblopteria M’Coy and its historical development in Northeast Russia. Two new stratigraphically important species have been described from the Lower and Middle Permian deposits of the Omolon massif: S. parenensis sp. nov. and S. gracilicosta sp. nov.

Review was made for the Tarkhanian and Chokrakian representatives of the family Amathinidae. Two genera were defined—Leucotina and Carinorbis. The species L. ventosa (Bajarunas, 1910), L. belskayae (L. Iljina, 1993), L. costata sp. nov., L. excussa sp. nov., L. ovata sp. nov. and L. ovatoides sp. nov. were described in a composition of the genus Leucotina. L. ventosa is known from the undoubted Tarkhanian and continues to live in the Chokrakian, whereas the rest species were collected from the Chokrakian only. Relationships between the species of Leucotina remain unclear, although they can be divided into several morphological groups. It is concluded that a Chokrakian biodiversity of the genus is result of earlier (Tarkhanian) prehistory of Leucotina. Genus Carinorbis is represented by the rare and juvenile shells, which occur in uppermost Tarkhanian and in lower Chokrakian. The shells were determined as a species C. clathrata (Philippi). A proposal was made that Carinorbis not had a reproducing population in the Eastern Paratethys, but its founds is a result of bringing of the larvae from the neighboring bassins (Central Paratethys or Mediterranean).

The punctae of brachiopod genus Syringothyris Winchell, 1863 (order Spiriferida) are described and relation of punctae and fibrous secondary layer is characterized. Taxonomic significance of punctae and systematic position of the genus Syringothyris are considered.

Generic and species composition of Permosialidae (Insecta: Palaeomanteida) from the uppermost Lower and lower Middle Permian of European Russia is discussed. Permosialis defurcata Martynova, 1952, P. brevifurcata Martynova, 1952, P. bifasciata Martynov, 1933, P. cauleoides Martynova, 1952, P. marmorata Martynova, 1952, P. immaculata Martynova, 1952 and P. fasciata Martynova, 1952 (all from the Lower Kazanian deposits of Soyana in Arkhangelsk Region) are synonymized under P. paucinervis Martynov, 1928 from the coeval deposits of Tikhie Gory in Tatarstan. Permosialis quadriramosa Martynova, 1952 from Soyana is synonymized under Palaeomantopsis furcatella Martynov, 1928 from Tikhie Gory. Palaeomantopsis furcatella, Permosialis paucinervis, P. perfecta Martynova, 1952, and P. latiformis Martynova, 1952 (the latter two from Soyana) are redescribed. Permosialis vizzya sp. nov. from Upper Kungurian of Vorgashor coal field and P. martynovae sp. nov. from Soyana are described as new.

A new species of horse mackerel fish (Carangidae), Archaeus solus sp. nov., was described based on the imprint of a complete skeleton from the Lower Oligocene (Pshekha Formation) of Gorny Luch locality. This is the third known species of the Eocene–Oligocene genus Archaeus Agassiz, 1844, and the first discovery of Carangidae in the Oligocene of the North Caucasus. The new species differs from A. glarisianus Agassiz, 1844 from the Rupelian of Switzerland and A. oblongus Daniltshenko, 1968 from the basal Eocene of Turkmenistan by a larger number of rays in both the spiny and soft dorsal fin.

The article describes fossil remains of turtles from the Kudinovka locality (Paleogene, Paleocene or Ypresian; Millerovo District, Rostov Province, Russia). These remains, represented by 16 specimens, are referred to the sea turtle Tasbacka aldabergeni Nessov, 1987 (Cheloniidae), previously reliably known only from the type locality Zhylga 1 (Paleogene, Late Thanetian–Early Ypresian; southern Kazakhstan). One of the described specimens represents the most part of the postcranial skeleton in the phosphate nodule and appears to be the most complete postcranial specimen of Tasbacka aldabergeni, which gives information about previously unknown details of morphology of this species. The new materials expand our knowledge of the geographical distribution of Tasbacka aldabergeni and the genus Tasbacka in general.