Baissa (PIN collection 4210, layer 4) (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.

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

• "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 classes: macrofossils, mesofossils

Preservation: mold/impression

Reposited in the PIN

Primary reference: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 113354: authorized by Matthew Clapham, entered by Matthew Clapham on 28.07.2011, edited by Jered Karr

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Oviparosiphidae
"Oviparosiphum baissensis n. sp." = Archeoviparosiphum baissense3
"Oviparosiphum baissensis n. sp." = Archeoviparosiphum baissense3 Shaposhnikov and Wegierek 1989 aphid
PIN 4210/2623 (some paratypes could from from PIN 3064)
 Hemiptera - Szelegiewicziidae
Brimaphis certa n. gen. n. sp.5
Brimaphis certa n. gen. n. sp.5 Wegierek 1989 aphid
PIN 4210/2628
 Hemiptera - Palaeoaphididae
Ellinaphidinae indet.1 Kania and Wegierek 2008 aphid
PIN 4210/2654, 2655
Ellinaphis sp.1 Shaposhnikov 1979 aphid
PIN 4210/2650
Ellinaphis mirabila1 Kania and Wegierek 2008 aphid
PIN 4210/2658, 2653
Ellinaphis longistigma n. sp.1 Kania and Wegierek 2008 aphid
PIN 4210/2647
Buriataphis soporata n. sp.1 Kania and Wegierek 2008 aphid
PIN 4210/2651, 2648
Caudaphis sp.1 Zhang et al. 1989 aphid
PIN 4210/2626
Caudaphis brevicrura1 Kania and Wegierek 2008 aphid
PIN 4210/2649
Caudaphis angustivola1 Kania and Wegierek 2008 aphid
PIN 4210/2656, 2652
Caudaphis longiantennata1 Kania and Wegierek 2008 aphid
PIN 4210/2657
 Thysanoptera - Thripidae
Convexithrips robustus n. gen. n. sp.4
Convexithrips robustus n. gen. n. sp.4 Shmakov 2009 thrips
PIN 4210/2268,2273,2317,5449
 Thysanoptera - Aeolothripidae
Fusithrips crassipes n. gen.4 Shmakov 2009 thrips
PIN 4210/2260,2269,2331,5455
 Hymenoptera - Ichneumonidae
Palaeoichneumon micron n. sp. Kopylov 2009 ichneumon wasp
PIN 4210/1147
Palaeoichneumon freja n. gen. n. sp. Kopylov 2009 ichneumon wasp
PIN 4210/1146
 Coleoptera - Hybosoridae
Cretanaides trogopterus n. gen. n. sp.2
Cretanaides trogopterus n. gen. n. sp.2 Nikolajev 1996 scavenger scarab beetle
PIN 4210/706