Anna B. Vassilieva

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We describe a new species of megophryid frog from Loc Bac forest in the western part of the Langbian Plateau in the southern Annamite Mountains, Vietnam. Leptolalax pyrrhops sp. nov. is distinguished from its congeners by a combination of the following morphological attributes: (1) presence of distinct dark brown/black dorsolateral markings, including(More)
We describe two new mountain-dwelling microhylid species of the genus Kalophrynus from the southern part of the Annamite Mountains in Vietnam. The two new species differ from all known congeners in morphological characters and mtDNA; phylogenetically, they form a sister clade to the large-bodied K. interlineatus (1009 bp, 16S rRNA gene, mtDNA). Both species(More)
Hormones of the thyroid gland or thyroid hormones (THs) play an important part in the ontogeny of urodeles. The development of many systems and organs, including the skull, depend on THs [1–6]. The type and degree of this dependence considerably vary in different species of Urodela; however, the responses of the developing skull to THs in both primitive(More)
We studied skull, vertebral column, and limb skeleton development in Japanese clawed salamander Onychodactylus japonicus (Hynobiidae). The study is based on the ontogenetic series of embryos and larvae obtained from wild-captured adults by artificial induction of breeding using hormonal stimulation. The first stages of the skeleton formation in O. japonicus(More)
Skeletal development was studied in normal and goitrogen-treated Xenopus laevis tadpoles reared under thyroid hormone (TH) deficiency. Early stages of skeletal development proceed similarly in both groups. Later stages are retarded or completely arrested in goitrogen-treated tadpoles. After goitrogen-treated tadpoles were transferred into pure water or into(More)
168 The Caucasian salamander (Mertensiella cauca sica) and golden striped salamander (Chioglossa lusi tanica) are the most closely related taxa in the group of true salamanders belonging to the family Salaman dridae [1, 2]. In addition, they stand out among the other salamanders by a considerable similarity in their morphological constitution [3] and life(More)
113 In urodelans, some skull bones remain unchanged in shape and development, whereas others are vari able. The nasal bone (NB), a paired dermal bone of the frontal skull roof, is the most variable. It is not present in all salamanders and may have different topographic positions. In Ranodon sibiricus and Sala mandrella keyserlingi (Hynobiidae family), the(More)
A new species of the genus Oligodon from the coastal area of Binh Chau-Phuoc Buu Nature Reserve, Ba Ria-Vung Tau Province, southern Vietnam, is described. Oligodon arenarius sp. nov. is distinguishable from all other species by the unique combination of the following characters: medium size; 17 dorsal scale rows; 6-8 maxillary teeth, the posterior three(More)
The reproductive biology of Microhyla arboricola (Microhylidae) was studied in two regions of the southern Annamite Mountains in Vietnam. M. arboricola is an obligate phytotelm-breeder that reproduces in water-filled tree hollows in montane evergreen forests. Clutches are attached above the water level in the hollows and contain 5-37 pigmented, relatively(More)
64 Heterochronies, i.e., changes in the relative timing of the development of different morphological structures, are widespread in amphibians, which makes these animals a suitable object for studying both natural and experimental heterochronies. Temporal parameters of skull morphogenesis, including the timing and rate of the development of cranial(More)