Current Location:home > Browse

1. chinaXiv:202104.00006 [pdf]

Climate change and evolution of early lagomorphs (Mammalia): a study perspective based on new materials of Ordolagus from Nei Mongol (northern China)

Chiara ANGELONE; ZHANG Zhao-Qun
Subjects: Biology >> Zoology

The Early Oligocene is a critical time for global climate changes in the Cenozoic. This epoch witnessed severe mammalian faunal turnovers known as “Grande Coupure” in Europe and “Mongolian Remodelling” in Asia. However, insights about morphological changes in Oligocene mammal lineages have not been explored in detail. One of the least diversified groups of recent mammals, lagomorpha, is globally common in the fossil records, especially in Asia. During the Oligocene, many Eocene archaic lagomorph taxa died out and were replaced by more advanced forms. New findings from Nei Mongol and re-examination of the specimens from older collections enabled a revision of a common Asian lagomorph genus, Ordolagus, which possibly has a close affinity with the Middle–Late Eocene genus Gobiolagus. In Nei Mongol, we recognized the presence of Ordolagus during the basal Early Oligocene. Comparisons with coeval and slightly older lagomorph taxa from Asia and North America show that Ordolagus attained some salient tooth morphological characters (i.e., development of anteroconid on p3, full hypselodonty of cheek teeth, and lingual connection of trigonid and talonid on p4–m2), which are also the key features of modern leporids. The appearance of those morphologic features in Ordolagus is coeval to major global or regional climatic changes. Further investigations on Asian early lagomorphs compared with the study of other small mammals and local climatic factors will be essential to refine the role of lagomorphs as palaeoclimatic proxies.

submitted time 2021-04-02 From cooperative journals:《古脊椎动物学报》 Hits186Downloads90 Comment 0

2. chinaXiv:202010.00042 [pdf]

Taxonomic identity of Primulina swinglei (Gesneriaceae)

HONG Xin; KEENE Jeremy; SHAN Wanyue; VAN DO Truong; WEN Fang
Subjects: Biology >> Botany >> Applied botany

Chirita Buch.-Ham. ex D. Don is a human-defined genus. Phylogenetic reconstruction of this genus and its related genera was carried out on the basis of molecular systematics research in 2011. Most of the species of Sect. Gibbosaccus C.B. Clark were incorporated into Primulina Hance. However, due to historical reasons, the limitations of early classical taxonomy in research methods and the understanding of vegetative organs and reproductive organs of some species of former Chirita need to be further studied, there are still some problems in the classification of some species of this genus, which need to be further studied. For example, in the process of studying Gesneriaceae plants distributed in China and Vietnam, we found that there are taxonomic problems in the identification of two species of Primulina: Primulina swinglei, which is widely distributed from Southwest China to the middle of Indochina Peninsula, and P. laxiflora, which was originally considered to be endemic to China and Guangxi. Further clarification is needed to clarify the relationship between the two species. In this paper, the morphological comparison of the two species was carried out. At the same time, through the original description comparison, plant specimen examination, cultivation observation and field observation of the two plants, we determined that P. laxiflora is the synonym of P. swinglei. In addition, the lectotype of P. swinglei is also designated here to confirm the taxonomic status of the species.

submitted time 2020-10-20 From cooperative journals:《广西植物》 Hits5516Downloads536 Comment 0

3. chinaXiv:202009.00030 [pdf]

Paraboea nanxiensis (Gesneriaceae), a new species from southeastern Yunnan Province, China

ZHANG Guiliang; CAI Lei; WANG Yizhi; ZHANG Guisheng
Subjects: Biology >> Botany >> Applied botany

Paraboea nanxiensis Lei Cai & Gui L. Zhang, a new species of Gesneriaceae from karst area around the Sino-Vietnamese border, is described here. The new species is morphologi-cally similar to P. nutans D. Fang & D. H. Qin in the shape and indumentum characters of leaf blade, color of flower, length of the inflorescence and glabrous pistil, but it can be easily distin-guished by the shape of the corolla, the color of flower interior, the shape and indumentum of ca-lyx lobes, and capsule morphology. The detailed descriptions, color photographs, distribution and ecology, as well as its morphological relationship with similar species are also provided. In recent years, many new taxa or new record species have been found in limestone areas along the Sino Vietnam border, it is necessary to strengthen the investigation of plant diversity for better under-standing the high biodiversity in this area.

submitted time 2020-09-15 From cooperative journals:《广西植物》 Hits5869Downloads698 Comment 0

4. chinaXiv:202009.00043 [pdf]

Paraboea nanxiensis (Gesneriaceae), a new species from southeastern Yunnan Province, China

ZHANG Guiliang; CAI Lei; WANG Yizhi; ZHANG Guisheng
Subjects: Biology >> Botany >> Applied botany

Paraboea nanxiensis Lei Cai & Gui L. Zhang, a new species of Gesneriaceae from karst area around the Sino-Vietnamese border, is described here. The new species is morphologi-cally similar to P. nutans D. Fang & D. H. Qin in the shape and indumentum characters of leaf blade, color of flower, length of the inflorescence and glabrous pistil, but it can be easily distin-guished by the shape of the corolla, the color of flower interior, the shape and indumentum of ca-lyx lobes, and capsule morphology. The detailed descriptions, color photographs, distribution and ecology, as well as its morphological relationship with similar species are also provided. In recent years, many new taxa or new record species have been found in limestone areas along the Sino Vietnam border, it is necessary to strengthen the investigation of plant diversity for better under-standing the high biodiversity in this area.

submitted time 2020-09-15 From cooperative journals:《广西植物》 Hits5937Downloads599 Comment 0

5. chinaXiv:201902.00011 [pdf]

A genus Schizotrema (Graphidaceae) new to China, with a world-wide key

JIA Zefeng; Robert Lücking
Subjects: Biology >> Botany >> Applied botany

Based on the specimens collected from Yunnan Province, the lichen genus Schizotrema Mangold &Lumbsch is reported as new to China, with the species S. guadeloupense (Hale) Mangold & Lumbsch. Among Graphidaceae, the genus is characterized by its ascomata with concentrically layered margins composed of carbonized excipular remnants of older hymenia; the proper exciple is fused to indistinctly free, periphysoids are usually present, and the ascospores are transversely septate to muriform. The species also is new to Asia. Notes of other five species in the genus are given, also with ecology and distribution. World-wide key to species of Schizotrema be presence in the present paper. This study provides the basic data for the taxonomy of the family Graphidaceae.

submitted time 2019-01-30 From cooperative journals:《广西植物》 Hits5714Downloads794 Comment 0

  [1 Pages/ 5 Totals]