Baissa (PIN collection 4210, layer 35): Aptian, Russian Federation

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Insecta - Saurodectidae
Saurodectes vrsanskyi n. gen., n. sp. Rasnitsyn and Zherikhin 1999
Rasnitsyn and Zherikhin 1999 1 specimen
PIN 4210/7056 (1 measurement)
Insecta - Hemiptera - Matsucoccidae
Eomatsucoccus popovi n. sp. Koteja 1988
1 specimen
PIN 4210/1102 (2 measurements)
Insecta - Hemiptera - Szelegiewicziidae
Brimaphis certa Wegierek 1989
Wegierek 1989 1 specimen
PIN 4210/2839 (1 measurement)
Tinaphis laticubitus n. gen., n. sp. Wegierek 1989
Wegierek 1989 1 specimen
PIN 4210/2849 (2 measurements)
Insecta - Hemiptera - Palaeoaphididae
Ellinaphidinae indet. Kania and Wegierek 2008
Kania and Wegierek 2008 2 specimens
PIN 4210/2838, 7612
Ellinaphis extenda Kania and Wegierek 2008
Kania and Wegierek 2008 1 specimen
PIN 4210/2835
Ellinaphis incognita Shaposhnikov 1979
Kania and Wegierek 2008 1 specimen
PIN 4210/2841
Ellinaphis longistigma Kania and Wegierek 2008
Kania and Wegierek 2008 4 specimens
PIN 4210/2831, 2832, 2833, 7613
Insecta - Hymenoptera - Ichneumonidae
Palaeoichneumon mirabilis n. sp. Kopylov 2009
Kopylov 2009 1 specimen
PIN 4210/1155 (1 measurement)
Insecta - Diptera - Mycetophilidae
Palaecomoptera longimedia Blagoderov 1997
Blagoderov 1997 1 specimen
PIN 4210/2977 (2 measurements)
Insecta - Diptera - Ironomyiidae
Hermaeomyia armata Mostovski 1995
Mostovski 1995 1 specimen
recombined as Palaeopetia armata
PIN 4210/3089 (2 measurements)
Insecta - Diptera - Platypezidae
Parnasos firmipes Mostovski 1995
Mostovski 1995 1 specimen
PIN 4210/3100
see common names

Geography
Country:Russian Federation State/province:Buryatia
Coordinates: 53.3° North, 112.1° East (view map)
Paleocoordinates:56.0° North, 108.5° East
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous
Stage: Aptian 10 m.y. bin: Cretaceous 3
Key time interval: Aptian
Age range of interval: 121.4 - 113 m.y. ago
Stratigraphy
Formation:Zaza
Stratigraphy comments: C. longipoda, E. trisetalis and Lycoptera all occur in the Zaza Formation indicating that this formation could be correlated with the upper Yixian Formation and the lower Jiufotang Formation in western Liaoning, which have a duration of 122.5-120 Ma. So it is possible to assign the Zaza Formation to an Aptian age. Also correlated with Barremian-Aptian based on plants and pollen.
Lithology and environment
Primary lithology: lithified siltstone
Secondary lithology: lithified marl
Environment:lacustrine - large Tectonic setting:rift
Geology comments: "The water body is reconstructed as an intermontane lake with the depth of 20 - 30 meters (LYAMINA 1980) situated within a granite massif. The presence of thick layers of the bituminous shales shows that the lake was meromictic, with the oxygen deficiency and high hydrogen sulphur level in the hypolimnion. However, the oxygenated epilimnion should be thick, with a lower boundary well beneath the limit of episodic wave action because no suffocation events are documented. The abundance of caddisflies, dobsonfly larvae and other groups intolerant to oxygen deficiency shows that in more shallow areas the water was clear and well-oxygenated even near the bottom. The lake ecosystem was highly productive as indicated by its complex trophic structure (Fig. 2) with several levels of predators up to the large sturgeon-like fish Stychopterus as well as by the extremely high abundance of planetonivorous phantom midges (SINICHENKOVA & ZHERIKHIN 1996)." ZHERIKHIN et al., 1999
Taphonomy
Modes of preservation:mold/impression
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:survey of museum collection
Collection size:7647 specimens
Reason for describing collection:taxonomic analysis
Museum repositories:PIN
Metadata
Database number:113353
Authorizer:M. Clapham Enterer:M. Clapham, J. Karr, L. Edwards
Modifier:M. Clapham Research group:paleoentomology
Created:2011-07-28 14:15:37 Last modified:2014-08-05 22:40:06
Access level:the public Released:2011-07-28 14:15:37
Creative Commons license:CC BY
Reference information

Primary reference:
51538. J. Koteja. 1988. Eomatsucoccus n. g. (Homoptera, Coccinea) from Siberian Lower Cretaceous deposits. Annales Zoologici 42:141-163 [M. Clapham/M. Clapham]

Secondary references:

41289 V. A. Blagoderov. 1997. Fungus Gnats of the Tribe Gnoristini (Diptera, Mycetophilidae) from the Lower Cretaceous of Transbaikalia. Paleontological Journal 31(6):609-615 [M. Clapham/L. Edwards/J. Karr]
48084 I. Kania and P. Wegierek. 2008. Palaeoaphididae (Hemiptera, Sternorrhyncha) from Lower Cretaceous Baissa deposits: Morphology and classification. Monografie faunistyczne 25:1-135 [M. Clapham/J. Karr]
36791 D. S. Kopylov. 2009. A new subfamily of Ichneumonids from the Lower Cretaceous of Transbaikalia and Mongolia (Insecta: Hymenoptera: Ichneumonidae). Paleontological Journal 43(1):83-93 [M. Clapham/M. Clapham]
46865 M. B. Mostovski. 1995. New Mesozoic Platypezidae (Diptera) and the main directions of evolution of the family. Paleontological Journal 29(2):130-146 [M. Clapham/J. Karr]
40861 M. B. Mostovski. 1995. New taxa of Ironomyiidae (Diptera, Phoromorpha) from the Cretaceous of Siberia and Mongolia. Paleontological Journal 30:318-331 [M. Clapham/M. Clapham/M. Clapham]
36790 A. P. Rasnitsyn and V. V. Zherikhin. 1999. First fossil chewing louse from the Lower Cretaceous of Baissa, Transbaikalia (Insecta, Pediculida=Phthiriaptera, Saurodectidae fam n). Russian Entomological Journal 8(4):253-255 [M. Clapham/M. Clapham]
40723 P. Wegierek. 1989. New species of Mesozoic aphids (Snaposhnikoviidae, Homoptera). Paleontological Journal 23(4):40-49 [M. Clapham/M. Clapham]