Baissa (PIN collection 3064, bed 2) (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: G. K. Shaposhnikov and P. Wegierek. 1989. New late Mesozoic aphids (Oviparosiphidae, Homoptera). Paleontological Journal 23(3):37-47 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 125412: authorized by Matthew Clapham, entered by Matthew Clapham on 09.03.2012, edited by Lindy Edwards and Jered Karr

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Mimarachnidae
Mimarachne mikhailovi5 Shcherbakov 2007 planthopper
PIN 3064/4018
 Hemiptera - Oviparosiphidae
Vitimaphis rasnitsyni n. gen. n. sp., "Oviparosiphum baissensis" = Archeoviparosiphum baissense
Vitimaphis rasnitsyni n. gen. n. sp. Shaposhnikov and Wegierek 1989 aphid
PIN 3064/2235
"Oviparosiphum baissensis" = Archeoviparosiphum baissense Shaposhnikov and Wegierek 1989 aphid
PIN 3064/2316, 2213 (assumed to be from bed 2)
 Hemiptera - Palaeoaphididae
Ellinaphidinae indet.3 Kania and Wegierek 2008 aphid
PIN 3064/3984
Ellinaphis sp.3 Shaposhnikov 1979 aphid
PIN 3064/3976, 3986
Ellinaphis bulla n. sp.3 Kania and Wegierek 2008 aphid
PIN 3064/3980
Ellinaphis cubocrassa3 Kania and Wegierek 2008 aphid
PIN 3064/1899, 2232, 3983, 4009
Ellinaphis longistigma3 Kania and Wegierek 2008 aphid
PIN 3064/3982
Caudaphis vulgata3 Kania and Wegierek 2008 aphid
PIN 3064/2231, 3987
Caudaphis longiantennata3 Kania and Wegierek 2008 aphid
PIN 3064/2233, 4006
 Blattaria - Holocompsidae
Vitisma rasnitsyni6 Vršanský 1999 cockroach
PIN 3064/3375
 Mantodea -
Vitimophotina corrugata2 Gratshev and Zherikhin 1993 mantis
PIN 3064/419
 Phasmatodea - Susumaniidae
Phasmomimoides ornatus4 Kuzmina 1985 stick insect
PIN 3064/8300, 8301
 Coleoptera - Buprestidae
Metabuprestium vitimense n. sp.1 Alexeev 1996 jewel beetle
PIN 3064/7129