Santa Juana, level FL2, Biobío River (Triassic of Chile)

Where: Concepción, Chile (37.2° S, 73.0° W: paleocoordinates 53.8° S, 39.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Santa Juana Formation, Carnian (237.0 - 228.0 Ma)

• Assigned a Carnian age based on paleoflora and Nielsen (in press) by Gallego et al. (2005), but others have proposed Upper Carnian/Lower Norian (based on marine molluscs) or Upper Carnian to Lower Rhaetian (also on paleoflora).

Environment/lithology: lacustrine; lithified, black mudstone

• Rivers, lakes, playas and alluvial fans; black mudstones interpreted as lake deposits.

Size class: mesofossils

Preservation: mold/impression

Collected by S.V. Nielsen, K. Bandel in 1997, 2000

• Specimens kept in SGO-PI – Paleontology Section of the Museo Nacional de Historia Natural, Santiago, Chile.

Primary reference: R. G. Martins-Neto, O. F. Gallego, and R. N. Melchor. 2003. The Triassic insect fauna from South America (Argentina, Brazil and Chile): a checklist (except Blattoptera and Coleoptera) and descriptions of new taxa. Acta Zoologica Cracoviensia 46(Suppl):229-256 [M. Clapham/J. Karr/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 123024: authorized by Matthew Clapham, entered by Jered Karr on 10.01.2012, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Hemiptera - Dysmorphoptilidae
Bandelnielsenia chilena n. gen. n. sp.
Bandelnielsenia chilena n. gen. n. sp. Martins-Neto and Gallego 2003 true bug
SGO.PI.5989
 Coleoptera - Permosynidae
Ischichucasyne santajuanaensis n. gen. n. sp. Martins-Neto and Gallego 2005 beetle
SGO.PI.6140
 Coleoptera - Ademosynidae
Ademosyne sp. Handlirsch 1906 beetle
SGO.PI.6139A,B
Branchiopoda
 Diplostraca - Polygraptidae
Polygrapta troncosoi Gallego 1998 clam shrimp
 Diplostraca - Eosestheriidae
Menucoestheria terneraensis Gallego 1998 clam shrimp