PBDB Collection

Baissa (PIN collection 4210, layer 15) (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: 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]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 125791: authorized by Matthew Clapham, entered by Matthew Clapham on 24.03.2012, edited by Jered Karr

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Insecta
Hemiptera - Hylicellidae	Conjucella selene⁸ Conjucella selene⁸ Shcherbakov 2012 true bug PIN 4210/1013
Hemiptera - Palaeoaphididae	Ellinaphidinae indet.², Ellinaphis mirabila n. sp.², Ellinaphis cubocrassa², Ellinaphis sensoriata², Ellinaphis longistigma², Rallotopaphis antennata², Caudaphis vulgata² Ellinaphidinae indet.² Kania and Wegierek 2008 aphid PIN 4210/2671, 2672 Ellinaphis mirabila n. sp.² Kania and Wegierek 2008 aphid PIN 4210/6879 Ellinaphis cubocrassa² Kania and Wegierek 2008 aphid PIN 4210/2675 Ellinaphis sensoriata² Shaposhnikov 1979 aphid PIN 4210/2674 Ellinaphis longistigma² Kania and Wegierek 2008 aphid PIN 4210/2676, 2684 Rallotopaphis antennata² Kania and Wegierek 2008 aphid PIN 4210/2673 Caudaphis vulgata² Kania and Wegierek 2008 aphid PIN 4210/2670
Hymenoptera - Praeaulacidae	Westratia striata n. sp.⁶ Westratia striata n. sp.⁶ Rasnitsyn 1990 wasp PIN 4210/1136
Hymenoptera - Braconidae	Cretobraconus brachyurus n. sp.⁷ Cretobraconus brachyurus n. sp.⁷ Rasnitsyn and Sharkey 1988 wasp PIN 4210/1148
Coleoptera - Scarabaeidae	Baisarabaeus rugosus n. gen. n. sp.⁴ Baisarabaeus rugosus n. gen. n. sp.⁴ Nikolajev 2005 scarab beetle PIN 4210/707
Coleoptera - Hybosoridae	Leptosorus zherikhini n. gen. n. sp.⁵ Leptosorus zherikhini n. gen. n. sp.⁵ Nikolajev 2006 scavenger scarab beetle PIN 4210/5461
Diptera - Ironomyiidae	"Hermaeomyia bellula" = Palaeopetia bellula, Hermaeomyia unisaetigera n. sp. "Hermaeomyia bellula" = Palaeopetia bellula Mostovski 1995 ironic fly PIN 4210/3085 Hermaeomyia unisaetigera n. sp. Mostovski 1995 ironic fly PIN 4210/3082, 3084
Diptera - Platypezidae	Maritulus sospes³ Maritulus sospes³ Mostovski 1995 flat-footed fly PIN 4210/3094
Diptera - Mycetophilidae	Pollicitator baisae¹, Baisodicrana secunda n. sp.¹, Prospeolepta trapezia¹ Pollicitator baisae¹ Blagoderov 1995 fungus gnat PIN 4210/2883, 2879 Baisodicrana secunda n. sp.¹ Blagoderov 1995 fungus gnat PIN 4210/2880 Prospeolepta trapezia¹ Blagoderov 1995 fungus gnat PIN 4210/2881, 2878

¹Blagoderov 1995; ²Kania and Wegierek 2008; ³Mostovski 1995; ⁴Nikolajev 2005; ⁵Nikolajev 2006; ⁶Rasnitsyn 1990; ⁷Rasnitsyn and Sharkey 1988; ⁸Shcherbakov 2012