scholarly journals Coniferous wood of Agathoxylon from the La Matilde Formation, (Middle Jurassic), Santa Cruz, Argentina

2018 ◽  
Vol 92 (4) ◽  
pp. 546-567 ◽  
Author(s):  
Adriana C. Kloster ◽  
Silvia C. Gnaedinger
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Secondary Xylem ◽  
Santa Cruz ◽  
Fossil Species ◽  
Dense Forest ◽  
Anatomical Data ◽  
Scatter Plots ◽  
Coniferous Wood

AbstractIn this contribution, four species of Agathoxylon are described from the La Matilde Formation, Gran Bajo de San Julián and central and south-western sectors of Santa Cruz Province, Argentina. Agathoxylon agathioides (Kräusel and Jain) n. comb., Agathoxylon santalense (Sah and Jain) n. comb., Agathoxylon termieri (Attims) Gnaedinger and Herbst, and the new species Agathoxylon santacruzense n. sp. are described based on a detailed description of the secondary xylem. In this work, it was possible to construct scatter plots to elucidate the anatomical differences between the fossil species described on quantitative anatomical data. Comparisons are made with other Agathoxylon species from Gondwana. These parameters can be used to discriminate genera and species of wood found in the same formation, as well as to establish differences/similarities between other taxa described in other formations. Some localities contain innumerable “in situ” petrified trees, which allowed us to infer that these taxa formed small forests, or local forests, or small forests within a dense forest, which is a habitat coincident with the extant Araucariaceae.

Two new fossil species of Itaphlebia (Mecoptera: Nannochoristidae) from Jiulongshan Formation, Inner Mongolia, China

Zootaxa ◽  
2010 ◽  
Vol 2420 (1) ◽  
pp. 37 ◽  
Author(s):  
NAN LIU ◽  
Yunyun Zhao ◽  
DONG REN
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Inner Mongolia ◽  
Northeastern China ◽  
Fossil Species ◽  
New Findings ◽  
Two New Species ◽  
Jiulongshan Formation ◽  
Southern Russia

Two new species, Itaphlebia exquisita sp. nov and Itaphlebia laeta sp. nov., were collected from the Jiulongshan Formation (Middle Jurassic) of Daohugou, Inner Mongolia, China. A key to the species of the genus Itaphlebia is provided and diagnosis of the genus is revised. Itaphlebia exquisita sp. nov differs from other species in having an extra medial vein branch. Itaphlebia laeta sp. nov shows a transitional character to the extant genera by having a simple Sc. These new findings expand the distribution of Itaphlebia from middle-southern Russia to northeastern China.

Rediscovery, redescription, and illustrations of the milliped, Mitocybe auriportae Cook and Loomis, 1928 (Colobognatha: Platydesmida: Andrognathidae)

Zootaxa ◽  
2010 ◽  
Vol 2475 (1) ◽  
pp. 39 ◽  
Author(s):  
ROWLAND M. SHELLEY
Keyword(s):  
New Species ◽  
Family Group ◽  
Geographical Proximity ◽  
Santa Cruz ◽  
Marin County ◽  
The Family ◽  
Two Component ◽  
A New Species

Mitocybe auriportae Cook and Loomis, 1928, is a thread-like, densely pubescent andrognathid milliped that lacks exoskeletal ornamentations and is equivalent in size to the veins in decaying leaves. Its anterior gonopods are dominated by a broad, subtriangular sternum; the falcate ultimate podomere arises subterminally and is directed ventrolaterad. The species is known from a single collection 91 years ago in Marin County, California; I report a new locality in Santa Cruz County and redescribe and illustrate somatic and gonopodal features. Mitocybe Cook and Loomis, 1928, is monotypic; a new species from Guerrero, Mexico, reported 30 years ago, is still undescribed and, from geographical proximity, probably referrable to Andrognathus Cope, 1869. Somatic features of these genera are contrasted. The taxonomy of Platydesmida is uncertain because it is based on somatic, rather than gonopodal, features and because Brachycybe Wood, 1864, bridges the anatomical gap between the two component families. The family-group name, Mitocybeini Hoffman, 1980, is available to accommodate Mitocybe. In situ SEM examinations of colobognath gonopods do not show details of the anterior gonopod sternum, and studies on dissected gonopods are recommended.

A new species of Protopsyllidiidae (Hemiptera, Sternorrhyncha) from the Middle Jurassic of China

Zootaxa ◽  
2012 ◽  
Vol 3274 (1) ◽  
pp. 36 ◽  
Author(s):  
GUANG YANG ◽  
YUNZHI YAO ◽  
DONG REN
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Inner Mongolia ◽  
Fossil Species ◽  
The Family ◽  
A New Species

A new fossil species, Poljanka hirsuta sp.n., of the family Protopsyllidiidae is described from the Middle Jurassic JiulongshanFormation of Daohugou Village, Inner Mongolia, China. A key to the species of the genus Poljanka Klimaszewski, 1995 is provided. The diagnosis of the genus is revised.

A new species of Progonocimicidae (Hemiptera: Coleorrhyncha) from northeastern China

Zootaxa ◽  
2012 ◽  
Vol 3495 (1) ◽  
pp. 73 ◽  
Author(s):  
QIUPING DONG ◽  
YUNZHI YAO ◽  
DONG REN
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Inner Mongolia ◽  
Northeastern China ◽  
Fossil Species ◽  
The Family ◽  
Jiulongshan Formation ◽  
Left And Right ◽  
A New Species

A new fossil species, Cicadocoris varians sp. n., of the family Progonocimicidae is described from the Middle Jurassic Jiulongshan Formation of Daohugou Village, Inner Mongolia, China. This Progonocimicidae is a well-preserved unusual fossil showing different sizes and proportions of the left and right tegmen.

A New Species ofGinkgowith Male Cones and Pollen Grains in situ from the Middle Jurassic of Eastern Xinjiang, China

2017 ◽  
Vol 91 (1) ◽  
pp. 9-21 ◽  
Author(s):  
Zixi WANG ◽  
Fankai SUN ◽  
Peihong JIN ◽  
Yingquan CHEN ◽  
Jingwei CHEN ◽  
...  
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Pollen Grains ◽  
Male Cones ◽  
A New Species

Sistemática, paleoecología e indicaciones paleoclimáticas de la tafoflora Monumento Natural Bosques Petrificados, Jurásico Medio, Patagonia, República Argentina

2009 ◽  
Author(s):  
◽  
Paula Falaschi
Keyword(s):  
Santa Cruz ◽  
Incertae Sedis

La zona de los bosques petrificados de Araucaria mirabilis (Speg.) Windhausen se ubica en el noreste de la provincia de Santa Cruz y corresponde estratigráficamente a la Formación La Matilde, de edad Jurásica Medio más alto. La excepcional preservación de sus conos, troncos y ramas petrificadas de coníferas le ha otorgado renombre mundial y ha sido motivo de numerosas contribuciones científicas. Para ésta y otras localidades de la Formación La Matilde (Ea. Bellavista, Ea. Laguna Manantiales, Gran Bajo de San Julián, Bajo del Tordillo, entre otras) se ha descripto una diversa paleobiota. La paleoflora comprende además de coníferas, permineralizaciones de hongos imperfectos, improntas y/o permineralizaciones de Equisetales, Filicales, Bennettitales así como grupos incertae sedis; mientras que dentro de la paleofauna se han descripto restos de anuros, icnitas de dinosaurios y mamíferos, trazas de insectos e improntas y petrificaciones de invertebrados de agua dulce. La presente tesis se centra en el estudio integral de una de las localidades fosilíferas más reconocidas de la Formación La Matilde: el Monumento Natural Bosques Petrificados o Bosque de Jaramillo. Se realizó una prospección del área, definiendo tres niveles fosilíferos de estudio: dos niveles de bosque in situ (Barda Blanca, Bosque Principal) y un nivel de origen lagunar con improntas de equisetáceas. Se propuso una amplia variedad de objetivos para el análisis de la paleoflora, que incluyen aspectos estructurales, sistemáticos, arquitecturales, paleoecológicos y paleoclimáticos de los niveles fosilíferos. Así, se dividió la tesis en capítulos que tratan cada tema en forma individual, comenzando con una introducción y/o metodología específicas, descripción de los materiales, discusión, comparaciones y conclusiones preliminares de cada capítulo, que son reanalizadas en conjunto al final de la tesis.

scholarly journals A new species of Ampulicomorpha Ashmead from Eocene French amber, with a list of fossil and extant Embolemidae (Insecta: Hymenoptera) of the world

2020 ◽  
Vol 191 ◽  
pp. 20
Author(s):  
Cédric Chény ◽  
Elvis Guillam ◽  
André Nel ◽  
Vincent Perrichot
Keyword(s):  
New Species ◽  
Evolutionary History ◽  
Western Europe ◽  
Distribution Map ◽  
Single Female ◽  
Fossil Species ◽  
The World ◽  
Poor Group ◽  
A New Species ◽  
Eocene Amber

Embolemidae is a cosmopolitan but species-poor group of chrysidoid wasps with a scarce fossil record, despite a long evolutionary history since at least the Early Cretaceous. Here, the new species, Ampulicomorpha quesnoyensis sp. nov., is illustrated and described based on a single female found in Early Eocene amber of Oise (France). The new species is compared with the three other known fossil species of the genus, and a key to all fossil species of Ampulicomorpha is provided. This is the third European fossil species of Ampulicomorpha, which suggests that the genus was once well established in Western Europe while it is more widely distributed in the Eastern Palaearctic region today. A list of all fossil and extant Embolemidae of the world, as well as a map of their geographical distribution map, are provided.

II.—The Petrology of the Suffolx Box-stones (Crag)

1915 ◽  
Vol 2 (6) ◽  
pp. 250-259 ◽  
Author(s):  
P. G. H. Boswell
Keyword(s):  
New Species ◽  
Recent Work ◽  
Early Pliocene ◽  
Stone Material ◽  
Molluscan Fauna ◽  
Recent Account

Although much has been written upon the palæontology of the Suffolk box-stones, no description appears hitherto to have been published of the petrology of these boulders. This is the more curious on account of the light it might throw upon the disputed question of their source, no similar sandstone having yet been recognized with certainty in situ. The most recent account of the molluscan fauna is by my friend Mr. Alfred Bell. In a preliminary paper he has given a list of sixty-three species (excluding cetacean bones, teeth, crustaceans, etc.), about twelve new species and varieties being described. Mr. Bell has now kindly let me see in advance the MS. of a revised list of Mollusca (seventy-six species), much new box-stone material having been obtained in the last few years. As a result of recent work, he considers the affinities of the fauna to be rather with the Rupelian (Continental Oligocene) than with the Bolderian or Diestian, as he formerly thought. Mr. Clement Reid, in The Pliocene Deposits of Britain (Mem. Geol. Survey, 1890), considered the box-stones to be of about the same age as the Diestian Beds, but Mr. F. W. Harmer has, in later publications, been inclined to consider them to be rather older and of very early Pliocene age.

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