The Lang Trang karstic cave is located in Ba Thuoc district of Thanh Hoa Province, northern Vietnam. Previously, the cave has been researched and discovered by archaeologists and paleontologists of 3 national survey teams (Vietnam - Netherlands, Vietnam - USA).
Testate amoebae are eukaryotic single-cell protozoa that move on pseudopods, have a shell and aperture, usually a few tens to several hundred µm in size. Testate amoebae live mainly in moist soils, swamps, ponds, lakes and freshwater bodies, rarely in brackish and marine environments.
The testate amoeba species Netzelia tuberspinifera (Hu, Shen and Gong, 1997) Gomaa et al., 2017 was firstly discovered and described as Difflugia tuberspinifera in 1997 in the Wujiang River (Guizhou province, China). Then, Yang et al. (2004) redescribed in relatively detail the morphological characteristics of this species based on two populations at Xinzhou and Mulan lakes (Hubei province, China).
Domestic dogs (Canis lupus familiaris or Canis familiaris) belong to the carnivorous order (Carnivora), mammal class (Mammalia). They are of the animals domesticated by humans very early. According to Dawin, domestic dogs have a multi-ancestral origin, which means that they may have descended from wolves, jackals, and some other carnivores. However, with the help of modern molecular genetic techniques, it has been shown that domestic dogs have only one ancestor, the wolf, one of the closest species in the taxonomy.
In Vietnam, the professional dog breeding has started and operated since 1954 of the twentieth century with the establishment of two large training centers, School 24 (Ministry of Defense) and Center C32 (Ministry of Public Security).
Since the ancient times, the H’mong people have used dogs for hunting and house keeping. Today, under the development of society and laws that prohibit wild animal hunting, the role of dogs is narrowed.
The bird, of the Passeriformes order, Leithrichidae family has scientific name Garrulax annamensis (Robinson & Kloss, 1919). It is medium-sized with an average length of about 25–27 cm. Regarding distinguishing features
The Eulimidae is a diverse group of symbiotic gastropods, most of which appear in tropical waters, but have not been fully studied. Worldwide, this family includes about 1,500 species, mostly known in symbiotic associations with all living classes of echinoderms.
The speed of urbanization and industrialization in areas near the sea is always proportional to the pressure on the environment. Untreated waste from factories in industrial zones becomes the main source of pollution to natural water, including aquaculture water systems. Heavy metal or toxic chemical pollution is the major threat to aquatic life, including fish
