Two New Species of the Genus Cryptomonas (Cryptophyta: Cryptophyceae) from Cat Tien National Park (Vietnam)

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Аннотация

In this paper, we describe two new species of the genus Cryptomonas from Cat Tien National Park (Vietnam): Cryptomonas pascheri and Cryptomonas playfairii, based on morphological characteristics and molecular analysis of the 18S, 28S, ITS2 rDNA and psb A cpDNA regions. The concept of compensatory base substitutions (CBCs) was also used for delimiting taxa. Both species are included in the same clade with C. lundii. If C. pascheri is morphologically similar to other species of the clade, then C. playfairii has obvious morphological differences. Each of the described species has clear molecular differences from related species in the C. lundii clade.

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Авторлар туралы

N. Martynenko

A.N. Severtsov Institute of Ecology and Evolution оf the Russian Academy of Sciences; Coastal Branch of the Joint Vietnam-Russia Tropical Science and Technology Research Center

Хат алмасуға жауапты Автор.
Email: nikita-martynenko@yandex.ru
Ресей, Moscow; Nha Trang, Vietnam

E. Gusev

A.N. Severtsov Institute of Ecology and Evolution оf the Russian Academy of Sciences; Coastal Branch of the Joint Vietnam-Russia Tropical Science and Technology Research Center

Email: nikita-martynenko@yandex.ru
Ресей, Moscow; Nha Trang, Vietnam

Phan Trong Huan

Coastal Branch of the Joint Vietnam-Russia Tropical Science and Technology Research Center

Email: nikita-martynenko@yandex.ru
Вьетнам, Nha Trang

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2. Fig. 1. Map of the study area (Cat Tien National Park, Vietnam). Arrows indicate sampling locations: 1 – Dong Nai River branch, 2 – Bau Sau Lake.

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3. Fig. 2. New to science species of the genus Cryptomonas from Vietnam: a–c – Cryptomonas pascheri sp. nov. (a – ventral view, b – dorsal view, c – lateral view (left side)); g–i – Cryptomonas playfairii sp. nov. (g–e – ventral view (e – the cell is partially turned to the left), g – dorsal view, h – lateral view (left side), i – lateral view (right side)). Arrows indicate: g – pharynx lined with ejectosomes, g – flagella, m – Moppa bodies, p – pyrenoid. Scale bar – 10 µm.

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4. Fig. 3. A tree showing the phylogenetic relationships of 69 representatives of the genus Cryptomonas . The genera Rhodomonas , Hemiselmis , and Guillardia are selected as an outgroup. The new species C. pascheri and C. playfairii are highlighted with rectangles. The tree was constructed based on a comparison of the nucleotide sequences of conservative markers: fragments of the genes of the small and large ribosomal subunits of nuclear DNA (18S and 28S rDNA) and a fragment of the psbA gene of cpDNA using the Bayesian approach (BI) and the maximum likelihood method (ML). The nodes show the Bayesian posterior probability (left) and the ML bootstrap value (right).

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5. Fig. 4. A tree showing the phylogenetic relationships of 69 representatives of the genus Cryptomonas , constructed based on the analysis of the intergenic transcribed spacer ITS2 rDNA using the Bayesian approach (BI) and the maximum likelihood (ML) method. The nodes show the Bayesian posterior probability (left) and the bootstrap ML value (right). The new species C. pascheri and C. playfairii are highlighted by rectangles.

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6. Fig. 5. Models of the secondary structure of the nuclear internal transcribed spacer 2 in the studied species. Black rectangles indicate the positions of compensatory base substitutions (CBCs) between C. pascheri (a), C. playfairii (b) and the species indicated in the figure, where 1A is C. playfairii VNG 2079, 1B is C. pascheri VNG 2086, 2 is C. kisselevii NN 21, 3 is C. lundii CCAC 0107, 4 is C. platyuris R 244, 5 is C. vietnamica VN 873.

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