New dicotyledonous woods from the San Carlos Formation (Upper Cretaceous) in Northern Mexico

IAWA Journal ◽  
2021 ◽  
pp. 1-11
Author(s):  
Emilio Estrada-Ruiz ◽  
Hugo I. Martínez-Cabrera ◽  
Imelda P. García-Hernández
Keyword(s):  
Upper Cretaceous ◽  
New Records ◽  
Floristic Composition ◽  
Northern Mexico ◽  
Ray Parenchyma ◽  
Perforation Plates ◽  
Relationship Of ◽  
San Carlos ◽  
Fossil Genus ◽  
Diameter Classes

Abstract We describe two new fossil woods from the San Carlos Formation (Upper Cretaceous), Chihuahua State, Mexico. The first wood resembles the fossil genus Metcalfeoxylon in having solitary vessels, scalariform perforation plates, vessel-ray parenchyma pits of similar size as the intervessel pits, axial parenchyma apotracheal diffuse and diffuse in aggregates, and heterocellular multiseriate rays with long, uniseriate tails. The second wood is a new fossil genus, and it is characterized by having diffuse porous wood, vessels predominantly solitary, vessel outlines oval and tending to be of two diameter classes, simple perforation plates, minute alternate intervessel pits, vessel-ray parenchyma pits similar to intervessel pits in size and shape, vasicentric tracheids, non-septate fibers, homocellular rays, and exclusively uniseriate and biseriate rays. This combination of features supports its placement in Myrtales (?Myrtaceae), in a new fossil-genus named Lazarocardenasoxylon. These two new records provide more information about the floristic composition of the Late Cretaceous flora of the San Carlos Formation and its relationship with those from the southern USA. However, a definitive picture of the floristic relationship of these Cretaceous floras of northern Mexico and southern USA remains elusive.

A New Late Cretaceous (Coniacian-Maastrichtian) Javelinoxylon Wood From Chihuahua, Mexico

IAWA Journal ◽  
2011 ◽  
Vol 32 (4) ◽  
pp. 521-530 ◽  
Author(s):  
Emilio Estrada-Ruiz ◽  
Hugo I. Martínez-Cabrera
Keyword(s):  
Late Cretaceous ◽  
Fossil Record ◽  
Upper Cretaceous ◽  
Fossil Wood ◽  
The State ◽  
Northern Mexico ◽  
Vessel Elements ◽  
Ray Parenchyma ◽  
Perforation Plates ◽  
San Carlos

We describe a new fossil wood from the San Carlos Formation (Coniacian- Maastrichtian) in Chihuahua, northern Mexico. This Malvaceae s.l. wood is diffuse porous, vessels are solitary and in radial multiples, simple perforation plates, small alternate intervessel pits, vessel-ray parenchyma pits that are rounded with reduced borders, septate and nonseptate fibers, homocellular and heterocellular rays, and storied rays and vessel elements. These features support its inclusion within the genus Javelinoxylon, Malvaceae s.l., which occurs in other Upper Cretaceous localities in northern Mexico (Olmos Formation) and Texas (Aguja and Javelina Formations). This San Carlos fossil wood is the earliest occurrence of storied structure in the fossil record and the earliest angiosperm record for the State of Chihuahua, Mexico.

DNA barcoding and phylogenetic relationship of shrimps (Crustacea: Decapoda) of Bangladesh

2021 ◽  
Vol 7 (1) ◽  
pp. 941-946
Author(s):  
Md Sagir Ahmed ◽  
Sumaiya Salam ◽  
Sayeda Sabrina Sarwar Rumana ◽  
Anindita Barua
Keyword(s):  
Dna Barcoding ◽  
Genetic Divergence ◽  
New Records ◽  
Coi Gene ◽  
Identification System ◽  
Taxonomic Rank ◽  
Macrobrachium Nipponense ◽  
Shrimp Species ◽  
The Mean ◽  
Relationship Of

We adopted DNA barcoding technique using a 658-bp fragment of the mitochondrial cytochrome c oxidase I (COI) gene to identify shrimp species collected from the different areas of Bangladesh. A total of 24 sequences were generated belonging to 14 species including four new records- Macrobrachium nipponense, Macrobrachium kistnense, Exopalaemon carinicauda and Alpheus malleator. Genetic distance measured with Kimura 2 parameter showed that genetic divergence increased with higher taxonomic rank. The mean genetic divergence was evaluated and found to be 0.935%, 22.67% and 30.92% within species, genus and family, respectively. In addition to the barcode-based species identification system, phylogenetic relationships were established where individuals belonging to the same species were grouped under the same clade. Maximum likelihood (ML) was preferred as the statistical method and as expected, the phylogenetic tree complemented and ensured the conventional taxonomy. The present study evidently showed that DNA barcoding can be served as an effective tool to discriminate the shrimp species and this will enhance the understanding on evolution and conservation biology. Bioresearch Commu. 7(1): 941-946, 2021 (January)

A new Peruvian species and new records of the genus Piestus Gravenhorst (Coleoptera: Staphylinidae)

Zootaxa ◽  
2017 ◽  
Vol 4303 (3) ◽  
pp. 417 ◽  
Author(s):  
LUIS PÉREZ ◽  
MARYZENDER RODRÍGUEZ ◽  
ANGÉLICO ASENJO
Keyword(s):  
New Species ◽  
New Records ◽  
Cladistic Analysis ◽  
Diagnostic Characters ◽  
Relationship Of ◽  
The Relationship ◽  
A New Species

A new species of the genus Piestus Gravenhorst is described from Peru, P. chullachaqui sp. nov. (Cuzco). Photographs and drawings of the major diagnostic characters are provided. A key to Piestus species is modified to include the new species. New records are provided for Piestus angularis Fauvel, Piestus bicornis (Olivier), Piestus fronticornis (Dalman), Piestus lacordairei Laporte, Piestus longipennis (Fauvel), Piestus mexicanus Laporte, Piestus minutus Erichson, Piestus pennicornis Fauvel, Piestus spinosus (Fabricius), Piestus sulcatus Gravenhorst, Piestus surrufus Caron et al. and Piestus validus Sharp. Cladistic analysis is made to know the relationship of the P. chullachaqui sp. nov. within Piestus.  

Fossil wood from the Upper Cretaceous crater sediments of the Salpeterkop volcano, North West Province, South Africa

2021 ◽  
Author(s):  
M. de Wit ◽  
M. Bamford
Keyword(s):  
South Africa ◽  
Upper Cretaceous ◽  
Ring Structure ◽  
Fossil Wood ◽  
Growth Rings ◽  
Local Climate ◽  
North West ◽  
Igneous Province ◽  
Fossil Genus ◽  
A New Species

Abstract The Salpeterkop volcano forms part of what has been referred to as the Upper Cretaceous Sutherland Suite of alkaline rocks, an igneous province composed of olivine melilitites, carbonatites, trachytes and ultramafic lamprophyres. Salpeterkop is a remnant of the summit tuff ring structure that surrounds a crater which is almost 1 km in diameter and is filled with epiclastic strata. Five pieces of silicified wood were collected from the crater filled sediments, sectioned and identified as a new species of Cupressinoxylon, C. widdringtonioides. This is the first example of the fossil genus in South Africa. Only one member of the Cupressaceae s.l. occurs in southern Africa today. From the wide and indistinct growth rings in the fossil wood it can be deduced that the local climate was warm and humid with little or no seasonality, in support of global records of a warm Late Cretaceous. The preservation of the crater further signifies the low level of erosion the region has experienced since its emplacement.

Upper Cretaceous aquatic plants from Northern Mexico

2009 ◽  
Vol 90 (4) ◽  
pp. 282-288 ◽  
Author(s):  
Emilio Estrada-Ruiz ◽  
Laura Calvillo-Canadell ◽  
Sergio R.S. Cevallos-Ferriz
Keyword(s):  
Aquatic Plants ◽  
Upper Cretaceous ◽  
Northern Mexico

New records of coleoid cephalopod jaws from the Upper Cretaceous of Hokkaido, Japan, and their paleobiogeographic and evolutionary implications

2017 ◽  
Vol 70 ◽  
pp. 128-141 ◽  
Author(s):  
Kazushige Tanabe ◽  
Akihiro Misaki ◽  
Yoshinori Hikida ◽  
Tomohiro Nishimura
Keyword(s):  
Upper Cretaceous ◽  
New Records ◽  
Coleoid Cephalopod

II.—The Unconformable Relationship of the Lower Tertiaries and Upper Cretaceous of New Zealand

1911 ◽  
Vol 8 (12) ◽  
pp. 539-549 ◽  
Author(s):  
James Park
Keyword(s):  
New Zealand ◽  
Upper Cretaceous ◽  
Economic Importance ◽  
Lower Tertiary ◽  
Great Economic Importance ◽  
The Subject ◽  
Academic Discussion ◽  
Relationship Of

With the question of conformity or unconformity between the Lower Tertiary and Upper Cretaceous, there is associated a problem of great economic importance to New Zealand. The subject involves something more than a mere academic discussion. If conformity exists, then we have only one coal-bearing formation; but if unconformity, then we have two. I believe that both the stratigraphical and palæontological evidence is overwhelmingly in favour of the latter.

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