Late Cretaceous and Paleogene freshwater gastropods from Northeastern Mexico

2008 ◽  
Vol 82 (2) ◽  
pp. 255-266 ◽  
Author(s):  
María Del Carmen Perrilliat ◽  
Francisco J. Vega ◽  
Belinda Espinosa ◽  
Edna Naranjo-Garcia
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Brackish Water ◽  
Freshwater Gastropods ◽  
Water Influence ◽  
Fine Grained ◽  
Living Species ◽  
Northeastern Mexico

Twenty-three species of Campanian, Maastrichtian, Paleocene, and Eocene freshwater gastropods from northeastern Mexico are described, including eight new species:Viviparus mcbridei, Pachychilus(Pachychiloides)lawtoni, Melanoides(Melanoides)yolandae, Melanoides(Melanoides)wollebeni, Physa cepedaensis, Mesolanistes magnus, Mesolanistes murrayi, andGyraulus zoltani.Specimens were collected from fine-grained, green sandstone and mudstone, red mudstone, and as hematized remains in fine light-brown sandstones belonging to the following stratigraphic units of northeastern Mexico: Cerro del Pueblo (Campanian, Parras Basin), Olmos (Maastrichtian, Sabinas Basin), Las Encinas (Paleocene, Parras Basin), and Carroza (Eocene, La Popa Basin) Formations. All except two of the genera (?PyrguliferaandMesolanistes) have recent representatives. Review of habitats of living species of the six extant genera and interpretations of sample lithologies support the inference of dominantly freshwater paleoenvironments. Only one Maastrichtian locality is interpreted confidently to have had a brackish water influence.

scholarly journals Diversity of the Crinocheta (Crustacea, Isopoda, Oniscidea) from Early Miocene Chiapas amber, Mexico

2018 ◽  
Vol 35 (3) ◽  
pp. 203-214 ◽  
Author(s):  
Pierre Broly ◽  
María De Lourdes Serrano-Sánchez ◽  
Francisco J. Vega
Keyword(s):  
New Species ◽  
Brackish Water ◽  
Fossil Record ◽  
Early Miocene ◽  
Paleoenvironmental Reconstruction ◽  
New Genera ◽  
Terrestrial Isopods ◽  
Water Influence ◽  
The Family

Currently, the Onisicdea (terrestrial isopods) is a massive Crustacea suborder of more than 3 700 species, but our knowledge of their paleodiversity is poor. In this paper, we present ten fossils of Crinocheta, the largest clade within the Onisicdea, discovered in Early Miocene (23 Ma) amber of Chiapas. We described three new genera and six new species including Palaeolibrinus spinicornis gen. nov. sp. nov., Armadilloniscus miocaenicus sp. nov., Archeostenoniscus robustus gen. nov. sp. nov., Archeostenoniscus mexicanus sp. nov., Palaeospherarmadillo mazanticus gen. nov. sp. nov., and Palaeospherarmadillo rotundus sp. nov. This study represents the first fossil record of the family Detonidae, Olibrinidae, and “Stenoniscidae”. From a paleoenvironmental reconstruction perspective, the oniscidean fauna presented here supports a particularly wet paleoenvironment, under brackish water influence, similar to an estuary.

Freshwater gastropods from Early Eocene Difunta Group, northeastern Mexico

1992 ◽  
Vol 66 (4) ◽  
pp. 603-609 ◽  
Author(s):  
Francisco J. Vega ◽  
Maria del Carmen Perrilliat
Keyword(s):  
New Species ◽  
Early Eocene ◽  
Lower Eocene ◽  
Freshwater Gastropods ◽  
Delta Plain ◽  
The Family ◽  
Paleoenvironmental Interpretation ◽  
Northeastern Mexico ◽  
Medical Importance ◽  
Three New Species

Three new species of freshwater gastropods are described from the lower Eocene Adjuntas Formation. Five more species are reported from the same fauna. This is the first report of Tertiary freshwater Mollusca of the Campanian–lower Eocene Difunta Group. The three new species (Hemisinus (Longiverena) reticulosus, Hemisinus (Longiverena) adjuntaensis, and Melanatria ypresiana) belong to the family Thiaridae, which today is a worldwide distributed group of freshwater gastropods of medical importance. Paleoenvironmental interpretation for red, green, and yellow beds of Adjuntas Formation suggests delta-plain deposits. Gastropods here described lived in swamps and marshes of this portion of the ancestral Gulf of Mexico.

Ginkgophytes of the Ul’ya flora (the Ul’ya depresiion, the Okhotsk-Chukotka volcanogenic belt)

Palaeobotany ◽  
2016 ◽  
Vol 7 ◽  
pp. 80-95 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Middle Part ◽  
Leaf Length ◽  
Volcanogenic Belt ◽  
Short Shoots ◽  
Volcanogenic Deposits

The Ul’ya flora comes from the Coniacian volcanogenic deposits of the Amka Formation (the Ul'ya depression, southern part of the Okhotsk-Chukotka volcanogenic belt). Ginkgoaleans are diverse in this flora and represented by three genera: Ginkgo, Sphenobaiera and Baiera. All specimens have no cuticle and were assigned to morphotaxa. Genus Ginkgo includes two species: G. ex gr. adiantoides (Ung.) Heer with entire leaves and G. ex gr. sibirica Heer with dissected leaves. Genus Sphenobaiera also consists of two species: S. ex gr. longifolia (Pom.) Florin with 4–8 leaf lobes and S. ex gr. biloba Prynada with two leaf lobes. Genus Baiera is represented by new species B. lebedevii Golovn., sp. nov.Leaves of this species are 25–30 cm long and 13–16 cm wide, narrowly wedge-shaped with flat slender petiole, dichotomously dissected 4–5 times into linear segments 3–6 mm wide with 6–12 veins. The length of ultimate segments is equal to about a half of leaf length. Leaves attached spirally to ovoid short shoots about 2 cm long. Among the Late Cretaceous floras similar diversity of ginkgoaleans was recorded only in the Turonian-Coniacian Arman flora from middle part of the Okhotsk-Chukotka volcanogenic belt (Herman et al., 2016). Four species of ginkgoaleans from the Ul’ya flora (except G. ex gr. adiantoides) are considered as the Early Cretaceous relicts.

scholarly journals Major and trace-element geochemistry of Late Cretaceous clastic rocks in the Jitai Basin, southeast China

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kai Yan ◽  
Chun-lian Wang ◽  
Steffen Mischke ◽  
Jiu-yi Wang ◽  
Li-jian Shen ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Brackish Water ◽  
Inductively Coupled Plasma ◽  
Salt Water ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Humid Climate ◽  
Southeast China ◽  
Clastic Rocks ◽  
Wide Range

AbstractMajor, trace and rare earth element (REE) geochemistry of the late Cretaceous lower Zhoutian Formation from the Jitai Basin of Southeast China were measured by inductively coupled plasma mass spectrometry (ICP-MS) analysis to infer the provenance of the sediments and to reconstruct the palaeoenvironment and palaeoclimate. The wide range of Sr/Cu ratios point to a fluctuating palaeoclimate, and the negative correlation between the FeO/MnO and Al2O3/MgO ratios and the Sr/Cu ratio indicates that the late Cretaceous climate during the lower Zhoutian Formation in the Jitai Basin can be divided into two parts. The lower part experienced two cooling periods, whilst the upper part was dominated by warm-humid climate. Mostly corresponding trends of the B/Ga, Sr/Ba and Sr/Cu ratios show that the salinity changed consistently with the late Cretaceous climate during the lower Zhoutian Formation in the Jitai Basin. During the lower part, the salinity changed from salt water to fresh/brackish water. In the upper part, water was mainly fresh/brackish, and there were many changes from fresh/brackish water to salt water. The relatively stable Ni/Co, V/Cr, V/(V + Ni) and Ce/Ce* data indicate a long period of oxic conditions. The La-Th-Sc, Th-Sc-Zr/10 and La/Th-Hf data of the silt- and sandstones of the lower Zhoutian Formation show that its provenance was mainly a mixture of felsic upper crust sediments and older sedimentary rocks.

Gastrotricha from Italian brackish water environments with the description of a new species of Chaetonotus

1999 ◽  
Vol 79 (4) ◽  
pp. 585-592 ◽  
Author(s):  
P. Tongiorgi ◽  
E. Fregni ◽  
M. Balsamo
Keyword(s):  
New Species ◽  
Brackish Water ◽  
Systematic Sampling ◽  
Coastal Lakes ◽  
Brackish Waters ◽  
Freshwater Habitats ◽  
Sampling Programme ◽  
First Time ◽  
River Po ◽  
A New Species

During 1996–1997 a systematic sampling programme was carried out in brackish coastal lakes and lagoons and in the delta of the River Po. In six of the nine collecting locations, 12 species of Gastrotricha were identified. One species, Chaetonotus ichthydioides, is new to science; another three species, the chaetonotidans Heterolepidoderma foliatum and the macrodasyidans Dendrodasys ponticus and Turbanella cf. pontica, and one macrodasyidan genus, Paradasys (P. subterraneus), were found in Italy for the first time. The unusual morphology of some of the species identified shows that Gastrotricha colonized brackish waters from both marine and freshwater habitats.

scholarly journals A new dinosaur (Theropoda, Spinosauridae) from the Cretaceous (Cenomanian) Alcântara Formation, Cajual Island, Brazil

2011 ◽  
Vol 83 (1) ◽  
pp. 99-108 ◽  
Author(s):  
Alexander WA. Kellner ◽  
Sergio A.K. Azevedo ◽  
Elaine B. Machado ◽  
Luciana B. de Carvalho ◽  
Deise D.R. Henriques
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
North Africa ◽  
Anterior Part ◽  
Functional Tooth

A new spinosaurid taxon, Oxalaia quilombensis gen. et sp. nov., is described based on the anterior part of a snout and a fragment of a maxilla. These specimens were collected at the Laje do Coringa site, Late Cretaceous (Cenomanian) of the São Luis Basin. Unlike Cristatusaurus and Suchomimus, Oxalaia quilombensis lacks serrations on the teeth. The new species differs from Angaturama limai by having the anterior part of the premaxillae more expanded and by lacking a sagittal premaxillary crest. It further differs from Spinosaurus cf. S. aegyptiacus and the Algerian spinosaurid by the rounder shape of the terminal expansion. Furthermore, xalaia quilobensis has one functional tooth followed by two replacement teeth, a feature not previously observed in theropods. Oxalaia quilombensis appears to be more closely related to the spinosaurids found in North Africa than to the Brazilian members of this clade and thus further increases the diversity of these enigmatic predatory dinosaurs in this country.

scholarly journals The firstCaipirasuchus(Mesoeucrocodylia, Notosuchia) from the Late Cretaceous of Minas Gerais, Brazil: new insights on sphagesaurid anatomy and taxonomy

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5594 ◽  
Author(s):  
Agustín G. Martinelli ◽  
Thiago S. Marinho ◽  
Fabiano V. Iori ◽  
Luiz Carlos B. Ribeiro
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Field Work ◽  
Lower Portion ◽  
Main Subject ◽  
Vertebrate Fauna ◽  
Paulo State ◽  
New Material ◽  
Fish Remains ◽  
A New Species

Field work conducted by the staff of the Centro de Pesquisas Paleontológicas Llewellyn Ivor Price of the Universidade Federal do Triângulo Mineiro since 2009 at Campina Verde municipality (MG) have resulted in the discovery of a diverse vertebrate fauna from the Adamantina Formation (Bauru Basin). The baurusuchidCampinasuchus diniziwas described in 2011 from Fazenda Três Antas site and after that, preliminary descriptions of a partial crocodyliform egg, abelisaurid teeth, and fish remains have been done. Recently, the fossil sample has been considerably increased including the discovery of several, partially articulated fish remains referred to Lepisosteiformes and an almost complete and articulated skeleton referred to a new species ofCaipirasuchus(Notosuchia, Sphagesauridae), which is the main subject of this contribution. At present, this genus was restricted to the Adamantina Formation cropping out in São Paulo state, with the speciesCaipirasuchus montealtensis,Caipirasuchus paulistanus, andCaipirasuchus stenognathus. The new material represents the holotype of a new species,Caipirasuchus mineirusn. sp., diferenciated from the previously ones due to the following traits: last two maxillary teeth located posterior to anterior edge of infraorbital fenestra, elongated lateroventral maxillo-jugal suture—about ½ the anteroposterior maxillar length—and contact between posterior crest of quadrate and posterior end of squamosal forming an almost 90° flaring roof of the squamosal, among others.C. mineiruswas found in the same outcrop thanCampinasuchusbut stratigraphically the former occurs in the lower portion of the section with no unambiguous data supporting the coexistance of both taxa.

scholarly journals Adocus Kohaku, A New Species of Aquatic Turtle (Testudines: Cryptodira: Adocidae) from the Late Cretaceous of Kuji, Iwate Prefecture, Northeast Japan, with Special References to the Geological Age of the Tamagawa Formation (Kuji Group) LSID urn:lsid:zoobank.org:act:61376EEE-A386-416E-98AE-FF64FE2597A2

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ren Hirayama
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Morphological Diversity ◽  
Eastern Asia ◽  
Geological Age ◽  
Iwate Prefecture ◽  
A New Species

A nearly complete shell of the genus Adocus (Adocidae; Pan-Trionychia; Cryptodira; Testudines) was collected from the late Cretaceous (Turonian) Tamagawa Formation of Kuji Group at Kuji City, Iwate Prefecture, northeast Japan. This turtle shows unique features such as the loss of cervical scute, extreme expansion of marginal scutes overlying costal plates, and exclusion of the humeral- pectoral sulcus from entoplastron. Thus, A. kohaku is erected as a new species. As A. kohaku shows most derived position of A. kohaku within this genus, morphological diversity of the genus Adocus seems to have occurred rather early in its evolution in Eastern Asia.

New Species ofNecaxacrisRoberts, 1939 (Orthoptera: Acrididae) from Northeastern Mexico

2012 ◽  
Vol 21 (2) ◽  
pp. 149-168
Author(s):  
Ludivina Barrientos-Lozano ◽  
Aurora Yazmín Rocha-Sánchez ◽  
Filippo M. Buzzetti
Keyword(s):  
New Species ◽  
Northeastern Mexico
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