An updated list for my three visits to Phu Quoc in 2015 and 2016

During my stay in Vietnam I was able to visit Phu Quoc island, located off the coast of Cambodia to the west of the Vietnamese Mekong delta, several times. It has a very interesting Odonate fauna compared to the rest of Vietnam, with several rare species, not seen elsewhere in Vietnam. I visited the island from 28 December 2015 to 2 January 2016, again from April 12 and April 15, 2016 and finally from August 19 to 21, 2016. Some species are very local and also occur only in the dry or in the rainy season, so not everything can be seen in any one trip. I already published a list after my first trip. This list is updated here to include all records, to which I added the months in which species were recorded by me in Roman capitals. But first a few photos of good species not published here previously.

Neurothemis intermedia male, 19 August 2016 

A second Neurothemis intermedia male from August 19, 2016

A target species I had been looking for on all my trips, which had been recorded by Bui (2008). Apparently this rare species is a summer species on the island. I only saw a single female, Lyriothemis mortoni.

The fascinating Platylestes platystylus, also on the island of Phu Quoc., August 20, 2016

Immature male of Brachydiplax sobrina, August 20 

And nearby an immature female, much harder to find generally

Monstrous Epophthalmia vittigera, a wonderful male, caught on August 21, 2016

A lovely Ceriagrion calamineum, previously recorded from the island, but misidentified as C. aurantiacum in Bui (2008). Finally found on 21 August 2016.

Agrionoptera insignis male over a dark pool, August 19, 2016. The only specimen I saw on my three visits.

The List:

Lestes praemorsus* VIII

Platylestes platystylus* VIII

Vestalis gracilis I, IV, VIII, XII

Libellago hyalina I, IV, VIII, XII

Heliocypha biforata I, IV, VIII, XII

Euphaea cyanopogon**** I, IV, VIII, XII

Rhinagrion viridatum XII, VIII

Podolestes coomansi***** IV

Aciagrion borneense I, XII

Agriocnemis minima* IV, VIII, XII

A. nana* IV, VIII, XII

A. pygmaea I, VIII, XII

Amphicnemis valentini**** VIII

Archibasis viola I, IV, VIII, XII

Ceriagrion calamineum** VIII

C. cerinorubellum IV, VIII, XII

C. malaisei* VIII

C. olivaceum* I, IV, XII

Ischnura senegalensis I, IV, XII

Mortonagrion falcatum*** I

Onychargia atrocyana IV, VIII

Paracercion calamorum* IV, VIII

Pseudagrion australasiae* IV, VIII, XII

P. microcephalum I, IV, XII

P. rubriceps IV, XII

P. pruinosum I

P. williamsoni I, IV, VIII, XII

Coeliccia kazukoae** I, IV

Coeliccia yamasakii IV

Pseudocopera ciliata* IV, VIII, XII

Copera vittata** I, IV, VIII, XII

Prodasineura verticalis** I, IV, VIII, XII

Anax guttatus I, VIII, XII

Gynacantha basiguttata* I, VIII

G. bayadera* I

G. subinterrupta* I

Heliaeschna crassa*** IV

Ictinigomphus decoratus meleanops I, IV, VIII

Paragomphus capricornis* XII

Epophthalmia frontalis* I

E. vittigera* VIII

Acisoma panorpoides IV, VIII, XII

Agrionoptera insignis* VIII

Brachydiplax chalybea* IV, VIII, XII

B. sobrina* IV, VIII

Brachygonia oculata IV, VIII

Brachythemis contaminata I, VIII, XII

Cratilla lineata IV

Crocothemis servilia I

Diplacodes nebulosa I, IV, VIII, XII

D. trivialis I, IV, XII

Hydrobasileus croceus I, VIII

Indothemis limbata*** I, VIII

Lathrecista asiatica I, IV, VIII

Lyriothemis mortoni VIII

Nannophya pygmaea IV, VIII, XII

Neurothemis fluctuans I, IV, VIII, XII

N. tullia IV, XII

N. fulvia IV, VIII, XII

N. intermedia* IV, VIII, XII

Orchithemis pulcherrima IV, VIII

Orthetrum sabina I, IV, VIII, XII

O. pruinosum* XII

O. chrysis I, IV, VIII, XII

Pantala flavescens I, VIII, XII

Potamarcha congener I, IV, VIII, XII

Pseudothemis jorina** I

Rhodothemis rufa* IV, VIII, XII

Rhyothemis aterrima* IV

R. obsolescens IV, VIII

R. phyllis I, IV, VIII, XII

R. variegata I, IV, XII

R. triangularis IV, VIII

Tetrathemis irregularis IV, XII

Tholymis tillarga I, IV, VIII, XII

Tramea transmarina euryale* I, VIII, XII

Trithemis festiva IV, XII

T. aurora I, IV, VIII, XII

T. pallidinervis I, IV, VIII

Urothemis signata I, IV, VIII

Zygonyx iris I, VIII

Zyxomma petiolatum* IV, VIII, XII

*       Refers to species first recorded on the island, although some are very common

**     Coeliccia kazukoae had already been found by Floris Brekelmans, but is not rare. Prodasineura verticalis had been recorded as Prodasineura sp. Copera vittata had been misidentified previously (as C. marginipes), but is a very common species. Pseudothemis jorina had been recorded but misidentified (presumably) as P. zonata. Ceriagrion calamineum had been misidentified as C. aurantiacum.

***   Refers to species recorded for the first time for Vietnam (as far as I know)

****  Refers to a species novum, but misidentified in previous surveys.

*****Recorded by Flores Brekelmans, not by me, but published on this blog

12 April, Melinh Field Station

April 12 was a beautiful day and I headed to Tam Dao to check raptor migration. Nothing flew, so very disappointing. Apart from a lone Chlorogomphus that is, exciting to know they are around already. But without birds, I decided to try Melinh. In a recent publication, Natalia von Ellenrieder et al. mention some interesting species from this area, but I had never been there. So I tried to go and stumbled onto the place without much difficulty. It has basically one major stream that runs through secondary forest and I followed it for quite a bit. Euphaea guerini was probably the commonest species. It is not all that common really, with Xuan Son providing good numbers, but elsewhere it is rare. Here is was common, followed by Mnais mneme, another nice species. And yet another reminder of Xuan Son was Prodasineura croconota, which I know also from Huu Lien. The commonest dragon was Orthetrum sabina, and for once I took some pictures of it. Other interesting species were Protosticta "grandis", a single female, Orolestes selysi, and Mortonagrion aborense, although that species by now is known to occur widely. The only gomphid was Ictinigomphus pertinax. Here are a few photos.

Brachydiplax chalybea flavovittata, a single male on a grassy pond

Handsome Prodasineura croconota, now also known to be widespread

Not a good picture, but it will do, I guess. Mnais mneme, orange-winged male

And because it was too common to ignore: male Orthetrum sabina

A third Brachydiplax for Vietnam

The genus Brachydiplax has currently 7 species. Two are known to occur widely in Vietnam. These are B. farinosa and B. chalybea. Traditionally the subspecies B. c. chalybea is said to occur in Vietnam, but in northern Vietnam the subspecies B. c. flavovittata is widespread. This is the same subspecies as in southern China. I do not know where the border between the two subspecies is, but B. c. flavovittata at least occurs south to Van Long Nature Reserve and Cuc Phuong National Park. In Cat Tien I found many of the nominate subspecies during my visit in early August. B. farinosa was also very common in Cat Tien, occurring mostly on forested pools. I had only seen it once in northern Vietnam, in Ba Be. It is certainly a lot less common than B. c. flavovittata in northern Vietnam.

Around the fish ponds in Cat Tien I noticed another Brachydiplax, stubbier and less brightly pruinose than B. farinosa and less yellow on the thorax than B. chalybea. It also missed the amber wing patches of that species. It soon became clear this was B. sobrina, a species known from India to Thailand. It had not been recorded in Vietnam to my knowledge, but was very common in Cat Tien.

I am sorry that the photos from this period are rather bad. One camera gave up completely in the constant rain and the other clouded over, as did the lenses.

A male Brachydiplax chalybea chalybea, with extensive yellow thorax

Here in hand, with deep yellow thorax and S1-3, plus amber bases to the wings

Brachydiplax sobrina, with green thorax and a tiny whitish spot on the anal triangle of the hindwing.

Dorsal view of B. sobrina, male

Male B. sobrina, showing the 7 cross veins in the front wing

Female B. sobrina

Yet another male B. sobrina

For comparison, a male B. farinosa under rainy and foggy conditions

Brachydiplax chalybea and Brachydiplax farinosa

On the 27 of July while checking a little pond at Ba Be National Park I noticed a smallish dragonfly that in shape and behaviour reminded me of Brachydiplax chalybea, but it had a blueish-grey thorax, without the double yellow flank lines. A little research quickly pointed me towards Brachydiplax farinosa, not a rare species, although to this day I have seen it only once. Its brother B. chalybea is a common sight at all kinds of ponds with heavy vegetation cover, for instance from Water Hyacinth. It can be found also in Ha Noi, and that says a lot about its tolerance for low quality water. Nevertheless, it is a nice looking species.

Brachydiplax farinosa, male

Brachydiplax chalybea, male

Brachydiplax chalybea, female