**Updates on December 15, 2016 after publication of the genus Euthygomphus Kosterin, 2016
There is one species of Merogomphus known from Vietnam. Merogomphus pavici is a large species, with distinctive appendages and markings. Euthygomphus parvus is a small southern species recorded from southern Vietnam that formerly was also included in Merogomphus. Then there is Anisogomphus tamdaoensis, described from Tam Dao, but at least also present at Ba Vi NP and in Hoa Binh Province and also originally included in Merogomphus.
During our travels at the end of June and beginning of July we observed Merogomphus pavici in Phu Tho Province (Xuan Son NP), in northern Bac Kan Province and in southern Cao Bang Province. This comes as no surprise, it is a widespread species.
|Merogomphus pavici, male, from Bac Kan Province. Long legs indeed.|
|Male Anisogomphus tamdaoensis from Hoa Binh Province, June 27|
|And its distinctive appendages in dorsal view|
|Female of presumably Anisogomphus tamdaoensis from Pia Oac, June 23.|
|Euthygomphus koxingai, male, late June Bac Kan Province|
|Another male Euthygomphus koxingai in the field|
|Appendages in dorsal view|
|In lateral view|
|And in ventral view|
|Female Anisogomphus neptunus in hand, Pia Oac Nature Reserve, early July|
|Another female preparing egg ball, this time not on a fern, but perched on a rock.|
|Close-up of abdomen, showing the extensive amount of yellow, both dorsally and laterally|
|Close-up of vulvar lamina|