Baissa (PIN collection 1989, layer 31) (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, carbonaceous 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 class: macrofossils

Preservation: mold/impression

Primary reference: V. N. Makarkin. 1997. Fossil Neuroptera of the Lower Cretaceous of Baisa, east Siberia. Part 3. Chrysopidae (Insecta). Spixiana 20:107-118 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 122552: authorized by Matthew Clapham, entered by Matthew Clapham on 03.01.2012, edited by Jered Karr, Arram Noshirvan and Lindy Edwards

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Mimarachnidae
Saltissus eskovi n. gen. n. sp.12
Saltissus eskovi n. gen. n. sp.12 Shcherbakov 2007 planthopper
PIN 1989/3590
 Hemiptera - Palaeoaphididae
Ellinaphis sensoriata7 Shaposhnikov 1979 aphid
PIN 1989/3340, 3343, 3592
Annulaphis rasnitsyni11 Shaposhnikov 1979 aphid
PIN 1989/3441
 Hemiptera - Hoploridiidae
Hoploridium dollingi n. gen. n. sp.10
Hoploridium dollingi n. gen. n. sp.10 Popov and Shcherbakov 1991 true bug
PIN 1989/3555
 Blattodea - Ectobiidae
"Mesoblattina vitimica n. sp." = Piniblattella vitimica13, Piniblattella minuta14
"Mesoblattina vitimica n. sp." = Piniblattella vitimica13 Vishnyakova 1964 cockroach
PIN 1989/1639(1646),1613-1615,1618,1619,1621,1624,1627,1628,1630,1631,1636,1637,1637B,1648,1649,1658,1662,1668,1674,1686,1841,2444
Piniblattella minuta14 Vršanský 1997 cockroach
PIN 1989/2450
 Dicondylia - Baissomantidae
Baissomantis maculata6 Gratshev and Zherikhin 1993 winged insect
PIN 1989/2489
Baissomantis picta6 Gratshev and Zherikhin 1993 winged insect
PIN 1989/1645, 8582, 8584
 Mantodea -
Cretophotina tristriata6 Gratshev and Zherikhin 1993 mantis
PIN 1989/2487, ?2488
 Phasmatodea - Susumaniidae
Phasmomimoides latus n. sp.8 Kuzmina 1985 stick insect
PIN 1989/2565
Phasmomimoides maculatus n. sp.8 Kuzmina 1985 stick insect
PIN 1989/2569
Phasmomimoides reticulatus n. sp.8 Kuzmina 1985 stick insect
PIN 1989/2570
Paraphasmomimella longa n. gen. n. sp.8 Kuzmina 1985 stick insect
PIN 1989/2582
 Orthoptera - Prophalangopsidae
Utanaboilus bellus n. sp.5 Gorochov 1996 hump-winged cricket
PIN 1989/2560
 Coleoptera - Buprestidae
Metabuprestium latipenne n. sp.1 Alexeev 1996 jewel beetle
PIN 1989/2929
 Diptera - Mycetophilidae
Zazicia innuba3 Blagoderov 1995 fungus gnat
PIN 1989/3271
Drepanorzeckia plana n. gen. n. sp.4 Blagoderov 1997 fungus gnat
PIN 1989/3283
 Diptera - Mesosciophilidae
Mesosciophilopsis minor n. sp.2 Blagoderov 1993 fly
PIN 1989/3149
 Neuroptera - Psychopsidae
Epipsychopsis fusca n. sp.9 Makarkin 2010 silky lacewing
PIN 1989/55
 Neuroptera - Chrysopidae
Mesypochrysa minima n. sp. Makarkin 1997 green lacewing
PIN 1989/7