Baissa (PIN collection 3064, bed 18) (Cretaceous of Russian Federation)

Where: Buryatia, Russian Federation (53.3° N, 112.1° E: paleocoordinates 56.0° N, 108.5° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Zaza Formation, Aptian (125.0 - 113.0 Ma)

• 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.

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; lithified marl and lithified, carbonaceous siltstone

• "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

Size class: macrofossils

Preservation: mold/impression

Reposited in the PIN

Primary reference: Y.u. A. Popov and D. E. Shcherbakov. 1991. Mesozoic Peloridioidea and their ancestors (Insecta: Hemiptera, Coleorrhyncha). Geologica et Palaeontologica 25:215-235 [M. Clapham/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123465: authorized by Matthew Clapham, entered by Jered Karr on 23.01.2012, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Insecta
 Hemiptera - Hoploridiidae
Hoploridium dollingi
Hoploridium dollingi Popov and Shcherbakov 1991 true bug
PIN 3064/6335
 Hemiptera - Palaeoaphididae
Ellinaphidinae indet.1, Annulaphis mostovskini n. sp.1
Ellinaphidinae indet.1 Kania and Wegierek 2008 aphid
PIN 3064/4555
Annulaphis mostovskini n. sp.1 Kania and Wegierek 2008 aphid
PIN 3064/4563
 Neuroptera - Berothidae
Mesithone proberotha3
Mesithone proberotha3 Makarkin 1999 beaded lacewing
PIN 3064/2390, 2398
 Neuroptera - Psychopsidae
Baisopsychops lambkini n. gen. n. sp.2
Baisopsychops lambkini n. gen. n. sp.2 Makarkin 1997 silky lacewing
PIN 3064/969
1Kania and Wegierek 2008; 2Makarkin 1997; 3Makarkin 1999