María Luisa Martínez Chacón

Brachiopods from the Valdeteja Formation (Pennsylvanian; Cantabrian Mountains, NW Spain)

After a short introduction on the lower Pennsylvanian (Bashkirian to lowermost Moscovian)ValdetejaFormationinitsstratigraphicalcontext,anoverviewofitsbrachiopodfaunasis presentedandtheirpalaeoecologicalandpalaeogeographicimportancediscussed.Twonewgeneraof the Strophalosiidina, showing adaptations to a reef environment, are described.The genus Ovetina (type species O. truyolsi gen. et sp. nov.) is an aulostegid with a well developed ventral flange. Miroproductus(typespecies M. posadaigen.etsp.nov.)isanearlyrichthofenioid,probablyderived fromanaulostegidsuchas InstitinaMUIR-WOOD&COOPER,1960.

LOWER MISSISSIPPIAN (OSAGEAN) SPIRE-BEARING BRACHIOPODS FROM CAÑÓN DE LA PEREGRINA, NORTH OF CIUDAD VICTORIA, TAMAULIPAS, NORTHEASTERN MÉXICO

Abstract Brachiopods are common in the lower and middle parts of the early Mississippian (Osagean) Vicente Guerrero Formation that is mainly a fine-grained quartz arenite found in the Ciudad Victoria area, Tamaulipas, northeastern México. This shallow marine brachiopod fauna includes several spire-bearers: Lamellosathyris lamellosa, Cleiothyridina cf. tenuilineata, Camarophorella sp., Alispirifer tamaulipensis n. sp., Tylothyris? sp., Torynifer pseudolineatus, Syringothyris cf. typa, Syringothyris? sp., and Punctospirifer sp. Similar assemblages have been found in Osagean rocks of the Santiago Formation, Oaxaca, southeastern México, and in several coeval formations in the USA: Arizona, Arkansas, Illinois, Ohio, and Texas. North American biogeographic affinities are suggested for these Mississippian faunas of northeastern México. These contrast markedly with the Late Silurian situation, where the Tamaulipas material has Old World Realm, rather than North American, biogeographic affinities. This supports the interpretation that northeastern México was an integral part of North America by the Mississippian, but not in the Late Silurian.

Material tipo de braquiópodos carboníferos, conservado en el Museo del Departamento de Geología de la Universidad de Oviedo

Entre la importante coleccion de fosiles que guarda el Museo del Departamento de Geologia de la Universidad de Oviedo, procedentes principalmente de la cordillera Cantabrica, se destaca en este trabajo el material tipo (holotipo y paratipos) de 55 especies de braquiopodos carboniferos. Se mencionan el holotipo y paratipos de estas especies (7 de ellas son, a su vez, especies tipo de sus respectivos generos, y uno de estos ultimos es el genero tipo de una subfamilia), se indica su procedencia y edad, asi como la sinonimia correspondiente y se figura el holotipo. Se destaca la importancia de esta vertiente ligada a la investigacion y la obligacion que tiene la institucion de conservar, catalogar adecuadamente y poner este material a disposicion de la comunidad cientifica.