Open Access

Description of Sergentomyia phadangensis n. sp. (Diptera, Psychodidae) of Thailand

  • Raxsina Polseela1, 2Email author,
  • Jerome Depaquit3 and
  • Chamnarn Apiwathnasorn4
Parasites & Vectors20169:21

https://doi.org/10.1186/s13071-016-1300-4

Received: 8 July 2015

Accepted: 7 January 2016

Published: 15 January 2016

Abstract

Background

Since 1996, there are emerging autochthonous cases of leishmaniasis in Thailand due to Leishmania “siamensis” and to L. martiniquensis explaining a recent interest for the sand fly fauna where Sergentomyia gemmea and Se. barraudi have been considered possible vectors in the country.

Methods

Field studies were undertaken in a cave of Phitsanulok Province, Thailand. Phlebotomine sandflies have been studied morphologically and some have been processed for molecular biology (sequencing of cytB rDNA).

Results

A new species of sand fly, belonging to the genus Sergentomyia: Se. phadangensis n. sp., is described. The association of the male and female is supported by the homology of the sequences of cytochrome b rDNA.

Conclusions

The description of a new species in Thailand is of importance in view of the existence of autochthonous leishmaniases.

Keywords

Phlebotomus Sergentomyia Thailand Caves Molecular biology Systematics

Background

As it is an area which has long been considered to be free of leishmaniasis, there are few data related to Phlebotomine sand flies in South-Eastern Asia. However, the first autochthonous South-Eastern Asian case of leishmaniasis was discovered in Thailand in 1996, followed by a total of 13 cases due to Leishmania “siamensis” and, surprisingly, to L. martiniquensis [1], a species of the French West Indies, recently described [2]. This new epidemiological datum explains a growing interest in the sand fly fauna of Thailand. A total of 26 species of phlebotomine sand flies have been recorded in this country: one Chinius, three Idiophlebotomus, eight Phlebotomus, one Grassomyia and 13 Sergentomyia [36], excluding Nemapalpus vietnamensis not considered to be a sand fly [7] and some doubtful records.

During field work carried out over one year in the Phadang limestone cave, the most abundant species caught - new to Science - is described in the present paper.

Methods

Sampling

Field studies were undertaken between February 2010 and January 2011 in Phadang cave in Noen Maprang, Phitsanulok Province, located in the lower northern part of Thailand at 16°30'58.8"N, 100°40'00.5"E. This limestone cave, situated in a mountainous area, is found in the foothills of a mountain and consists of two asymmetrical caverns. It is estimated to be 15–80 m wide, 80–100 m long, and 1–20 m high, and lies at 108 meters a.s.l. The cave may be wet or dry depending on the season and the amount of sunlight it receives. It is accessible to travelers, but is home to many bats.

Mounting

Phlebotomine sand flies were collected using CDC miniature light traps usually installed overnight from 6 p.m. to 6 a.m. Specimens collected were stored in 96 % ethanol. Some of them were mounted in toto in Hoyer’s medium and others for the application of molecular biology techniques. Regarding the latter: head, thorax and genitalia were cut off in a drop of ethanol, cleared in boiling Marc-André solution and, after dehydration, mounted on slides in Canada Balsam. The anterior part of the abdomen of each specimen was dried and stored in a vial at −20 °C, before DNA extraction.

The specimens were observed under a BX53 microscope equipped with a video camera and measured using Stream motion software (Olympus, Japan). The usual keys for the identification of the sand flies from the indo-chinese region have been consulted [810]. Drawings were made using a camera lucida. Morphological terminology is that commonly used for Old World sandflies [4, 5, 8, 1013] and we add the corresponding nomenclature proposed for Diptera [14]. Abbreviations of generic names follow [15]. All measurements are in μm.

Molecular analysis

We decided to sequence a fragment of cytochrome b (Cyt b) which is the most used molecular marker for Phlebotomine sand fly systematic studies [16]. Genomic DNA was extracted individually from the part of the abdomen of sand flies (5 males and 5 females) using the QIAmp DNA Mini Kit (Qiagen, Germany) following the manufacturer’s instructions, modified by crushing the sand fly tissues with a piston pellet (Treff, Switzerland), and using an elution volume of 50 to 200 μl [12].

All the mtDNA and rDNA amplifications were performed in a 50 μl volume using 5 μl of extracted DNA solution and 50 pmol of each of the primers N1N-PDR and C3B-PDR [17]. The PCR mix contained (final concentrations) 10 mM Tris HCl (pH 8.3), 1.5 mM MgCl2, 50 mM KCl, 0.01 % Triton X 100, 200 μM dNTP each base, and 1.25 units of 5 prime Taq polymerase (Eppendorf, Germany). The cycle begins with an initial denaturation step at 94 °C for 3 min and finishes with a final extension at 68 °C for 10 min. PCRs were done with the following temperature profile: 5 cycles with 30 sec 94 °C, 40 sec 40 °C, 1 min 68 °C and 35 cycles with 30 sec 94 °C, 30 sec 44 °C, 1 min 68 °C.

Amplicons were analyzed by electrophoresis in 1.5 % agarose gel containing ethidium bromide. Direct sequencing in both directions was performed using the primers used for DNA amplification.

The correction of sequences was done using Pregap and Gap softwares included in the Staden Package [18]. Consensus sequences were aligned by the Clustal W algorithm [19] from the BioEdit 4.8.10 sequence editor [20].

Results

Molecular analysis

The sequences analysed in the present study have been deposited in Genbank under numbers KT266691 to KT266700. All of them are similar (100 % homology).

Description of Sergentomyia phadangensis n. sp. Polseela, Depaquit & Apiwathnasorn

Genus Sergentomyia França & Parrot, 1920.

Species Sergentomyia phadangensis n. sp. Polseela, Depaquit & Apiwathnasorn.

Female (Figs. 1 and 2, Table 1)

Fig. 1

Se. phadangensis n. sp. female. a antennal segments III to V; b pharynx and cibarium ; c third palpal segment ; d palp; e wing; f furca and spermathecae

Fig. 2

Heads of the female holotype (a) and of an allotype (THA39) (b)

Table 1

Sergentomyia phadangensis n. sp. females measurements (n = 16) in μm

 

Holotype

Minimum

Maximum

Mean

Standard error

Head length

494

487

552

510.19

18.04

Head width

292

290

335

307.54

14.29

Eye length

155

143

188

158.69

12.55

Interocular distance

132

112

155

135.92

13.07

Clypeux length

92

86

111

97.43

8.86

AIII (= flagellomere I, F1)

165.29

140.71

165.29

158.71

8.36

AIV (= flagellomere II)

98.43

82.88

98.43

90.80

4.83

AV (= flagellomere III)

98.54

86.89

98.54

92.83

3.73

labrum-epipharynx (LE)

188.03

172.59

201.07

185.16

8.24

AIII (=FI)/LE

0.88

0.77

0.89

0.85

0.04

Palpal segment 1 (P1)

37.35

24.72

42.57

34.57

4.75

Palpal segment 1 (P2)

94.55

84.12

99.25

91.77

4.87

Palpal segment 1 (P3)

112.75

112.75

134.73

120.08

7.48

Palpal segment 1 (P4)

121.70

107.03

132.11

120.82

8.34

Palpal segment 1 (P5)

273.26

192.98

340.00

261.50

42.44

Wing length

1537.67

1383.73

1608.35

1498.53

58.02

Wing width

460.46

400.37

492.16

447.38

27.58

Alpha

288

146.00

288.00

197.00

41.17

Gamma

276

226.00

339.00

276.82

32.73

Delta

29

18.00

66.00

43.00

14.98

Pi

389

238.00

473.00

347.18

75.09

R5

1102

1010.00

1162.00

1083.09

48.58

Mesonotum length

481

481.00

599.00

522.55

39.69

The holotype (labelled THA4), and 15 paratypes specimens labelled P1, P2, P3, P4, P5, THA6, THA8, THA9, THA11, THA12, THA13, THA14, THA15, THA16 and THA19 have been examined. The labels refer to the lab where the specimens have been mounted (P: Thailand; THA: France).

*Head

Interocular suture complete.

Pharynx narrow. Discrete armature including some little teeth oriented backward.

Cibarium with a very important curved armature consisting of 6 to 8 strong and pointed teeth on each side and a few much smaller median and central ones. All these teeth are darkly pigmented in brown. Sometimes some accessory teeth in the upper and lateral parts of the cibarium. Pigment patch: wide, less pigmented than the teeth, triangular with rounded angles.

Palpal formula: 1, 2, (3, 4), 5. About forty Newstead's scales club-like in a patch on the basal face of the third segment.

Antennal formula: 2/III-XV. Relatively long ascoids, withour spur, not reaching the next articulation. AIII shorter than AIV + AV.

AIII shorter than the labrum.

Labial furca closed.

*Thorax

No setae on the mesanepisternum (proepimeral, anepisternal or katepisternal).

No pigmentation of mesonotum, pronotum, paratergite, anepisternum, metanotum, posnotum and pleura.

*Spermathecae: smooth and wide. No limit between the body and individual duct. Presence of a common basal duct.

Furca with a long and thin anterior part.

Male (Figs. 2 and 3, Table 2)

Fig. 3

Se. phadangensis n. sp. male. a antennal segments III to V; b pharynx and cibarium ; c palp ; d genitalia; e wing

Table 2

Sergentomyia phadangensis n. sp. males measurements (n = 10), in μm

 

Minimum

Maximum

Mean

Standard error

Head length

460

512

488.13

18.29

Head width

280

337

295.00

17.65

Eye length

152

169

158.44

5.15

Interocular distance

128

142

132.88

4.70

Clypeux length

95

131

118.33

10.82

AIII (= flagellomere I, F1)

143.60

145.29

144.65

0.91

AIV (= flagellomere II)

79.88

84.33

82.06

2.23

AV (= flagellomere III)

78.80

83.08

80.94

3.02

labrum-epipharynx (LE)

138.34

179.14

158.77

12.45

AIII (=FI)/LE

0.80

0.94

0.86

0.07

Palpal segment 1 (P1)

27.18

36.87

29.88

3.42

Palpal segment 1 (P2)

76.52

93.63

84.22

5.72

Palpal segment 1 (P3)

104.29

120.74

114.32

5.24

Palpal segment 1 (P4)

104.39

131.83

115.34

8.28

Palpal segment 1 (P5)

196.00

272.25

237.28

24.04

Wing length

1220.00

1403.09

1321.71

73.36

Wing width

361.28

411.61

395.36

17.52

Alpha

24.00

174.00

102.17

54.50

Gamma

227.00

268.00

252.40

15.60

Delta

−98.00

66.00

−9.67

61.87

Pi

300.00

349.00

325.60

17.39

R5

860.00

965.00

918.60

41.36

Mesonotum length

395.00

441.00

416.75

21.82

Coxite

193.76

214.00

202.19

6.74

Style

87.76

99.38

93.51

4.44

Aedeagus

79.99

94.21

86.38

4.00

Genital pump (GP)

70.72

92.46

80.04

7.36

Genital filaments (GF)

201.35

239.99

221.03

12.16

Surstyle (=epandrium)

143.59

194.24

164.48

18.38

Coxite/surstyle

1.08

1.41

1.24

0.13

GP/GF

2.47

3.00

2.77

0.20

Nine paratypes labelled P27, THA31, THA32, THA34, THA36, THA37, THA38, THA39 and THA40 have been examined. The labels refer to the lab where the specimens have been mounted (P: Thailand; THA: France)

*Head

Inter-ocular suture complete.

Cibarium with an important curved armature consisting of three to five large pointed teeth on each side and twelve to twenty denticles along the curve and sometimes outside this line. The latter are observable using the phase contrast option of the microscope.

No trace of a pigmented area could be seen.

Pharynx quite narrow, with a discrete armature composed of small teeth oriented backward.

Palpal formula: 1, 2, (3, 4), 5. A few Newstead's scales on the third palpal segment.

Antennal formula: 1/III-XV. AIII shorter than AIV + AV.

Labial furca closed.

*Thorax

No setae on the mesanepisternum (proepimeral, anepisternal or katepisternal).

No pigmentation of mesonotum, pronotum, paratergite, anepisternum, metanotum, posnotum and pleura.

*Genital Armature

Coxite with a few internal setae not grouped in a tuft.

Style narrow with four terminal spines. The accessory spine is implanted distally (between the distal quarter and third).

Single paramere, curved, with a rounded top.

Surstyle (=epandrium) shorter than the coxite.

Aedeagus straight, finger-like.

Type-locality: Phadang cave located in the lower northern part of Thailand at 16°30'58.8"N, 100°40'00.5"E, 108 meters above sea level.

The holotype (female) and 10 paratypes (5 females and 5 males) have been deposited in the National Science Museum of Pathumthani (Thailand). Fourteen paratypes (ten females and four males) have been deposited in the Museum national d’Histoire naturelle of Paris (France).

Etymology: the name Sergentomyia phadangensis n. sp. is related to the Phadang cave where it has been caught.

In accordance with section 8.5 of the International Code of Zoological Nomenclature, details of the new species have been submitted to ZooBank. The life science identifier (LSID) related to record is urn:lsid:zoobank.org:pub:8920F0C8-79BD-47AA-B367-E052C38023F9. The LSID for the new name Sergentomyia phadangensis is: urn:lsid:zoobank.org:act:425142C7-380D-46B0-8777-33469075C4DC.

Discussion

For a long time, the species of the genus Sergentomyia were little studied as they were not regarded as vectors of any human leishmaniasis agent. However, some of them have recently been presented as possible vectors of Leishmania responsible for human infection [21], in Thailand too [22].

Sergentomyia is the genus with the greatest known diversity, surpassing the number of species of all other Old World genera (Phlebotomus, Idiophlebotomus, Chinius, Spelaeophlebotomus, Grassomyia, Parvidens, Spelaeomyia and Demeillonius) taken together [23, 24]. The species of the genus Sergentomyia share the following characters: a mesanepisternum without setae, abdominal tergites 2–6 usually carrying all or most recumbent hairs, a usual 1/III–XV antennal formula in males and 2/III–XV in females with some exceptions, a cibarium with an armature of teeth and/or denticles more developed in females than in males (apart from exceptions), a single paramere, a style with four terminal spines (or often 2 terminal and 2 subterminal ones) and an accessory spine.

The species Se. phadangensis n. sp. exhibits the characters qualifying it for inclusion in the genus Sergentomyia.

Mainly based on the spermathecal morphology, the genus Sergentomyia is subdivided into eight subgenera: Sergentomyia França & Parrot, 1920; Neophlebotomus França & Parrot, 1920; Sintonius Nitzulescu, 1931; Parrotomyia Theodor, 1948; Rondanomyia Theodor, 1948; Capensomyia Davidson; Vattieromyia, Depaquit, Léger & Robert, 2008, and Trouilletomyia Depaquit, Léger & Randrianambinintsoa, 2014. Moreover, there are a lot of unclassified species within the genus Sergentomyia [25].

Se. phadangensis n. sp. exhibits wide and smooth spermathecae and can therefore be included in the subgenus Sergentomyia.

This new species can be easily differentiated from all the other species recorded in South-Eastern Asia by its highly developed cibarial armature in both females and males. The teeth are bigger and darker than those of the most closely related species, Se. dentata (Figs. 4 and 5). Moreover, the pharynx of Se. dentata is wide with a Se. antennata-like proeminent armature whereas that of Se. phadangensis n. sp. is narrow with a Se. schwetzi-like discret armature (Fig. 6). The record of Se. dentata in Thailand [26] should be checked in the light of the description of this new species. Initially described from Pakistan, Se. dentata is mainly distributed in the Middle-East and the Eastern Mediterranean basin [27].
Fig. 4

Cibariums of females of Se. phadangensis n. sp. (a, b, c, d, e) and of Se. dentata from Turkey (f)

Fig. 5

Cibariums of males of Se. phadangensis n. sp. (a) and of Se. dentata from Turkey (b)

Fig. 6

Pharynx and cibarium of males of Se. phadangensis n. sp. (a) and of Se. dentata from Turkey (b)

Conclusion

The description of a new species in Thailand is of importance taking into account the existence of autochthonous leishmaniases caused by L. “siamensis” and L. martiniquensis. The local transmission of these parasites is not explained, despite the possible role of two Sergentomyia species: Se. gemmea and Se. barraudi.

Abbreviations

Cyt b: 

Cytochrome b

Se.: 

Sergentomyia

Declarations

Acknowledgements

We thank Véronique Lehrter, Alicia Vol and Mireille Cousinat for their technical help. We are grateful to the Department of National Parks, Wildlife and Plant Conservation (Thailand) for permission to conduct field work at Tham Pha Tha Phon non-hunting area for the collection specimens from the cave.

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University
(2)
Center of Excellence in Medical Biotechnology, Faculty of Medical Science, Naresuan University
(3)
Université de Reims Champagne-Ardenne, ANSES, SFR Cap Santé, EA4688 – USC «transmission vectorielle et épidémiosurveillance de maladies parasitaires (VECPAR)»
(4)
Department of Medical Entomology, Faculty of Tropical Medicine, Mahidol University

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Copyright

© Polseela et al. 2016

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