Mukhlesur's Narrow-mouthed Frog
Species Description: Hasan M, Islam MM, Kuramoto M, Kurabayashiu A, Sumida M 2014 Description of two new species of Microhya (Anura: Microhylidae) from Bangladesh. Zootaxa 3755: 401-418.
© 2017 Dr. Peter Janzen (1 of 4)
Microhyla mukhlesuri can be distinguished from other species in the genus by its size, inverted U-shaped mark above the anus, slender fingers, lack of digit discs, rudimentary toe webbing, presence of metatarsal tubercles, and a tibiotarsal articulation that reaches between the eye and snout. More specifically, M. mukhlesuri is smaller than M. heymonsi and larger than M. mymensinghensis. Additionally, M. heymonsi has an X-shaped marking and M. mymensinghensis has a crescent shaped mark above the anus, respectively. The narrow first finger in M. mukhlesuri differentiates it from the wide first finger with a disc in M. butleri. Both M. chakrapanii and M. sholigari have toe tip discs. Full webbing in M. berdmorei differentiates it from M. mukhlesuri’s rudimentary toe webbing. Microhyla mukhlesuri has an outer metatarsal tubercle that differentiates itself from M. ornata, which lacks an outer metatarsal tubercle. The tibio-tarsal articulation in M. mukhlesuri reaches between the eyes to the snout while in M. ruba and M. fissipes, it only reaches the eye (Hasan et al. 2014). Microhyla mukhlesuri is found in sympatry with M. irrawaddy in northern Myanmar, but they can be differentiated because M. mukhlesuri lacks the prominent granular projection found in M. irrawaddy. Lastly, genetic analysis by Yuan et al. (2016) showed that M. mukhlesuri is widespread throughout the Indochina Peninsula while M. fissipes is found north of the Red River Basin.
In life, M. mukhlesuri has a dark X-shaped dorsal mark beginning at the eyes, narrowing in the front of the forelimbs and slightly widening between the shoulders before broadening and extending to the corners of the groin. At the snout tip, two black bands begin that run through the eyes then fuse together and extend to the groin. The tarsus, tibias, and thighs have multiple brown diagonal bars. There is a black inverted U-shaped mark above the anus and on both sides below the anus, there are multiple speckled dots. The whitish ventral surface is covered with sporadic tiny specks along the throat (Hansan et al. 2014). When preserved in alcohol, M. mukhlesuri has a dark gray to brown dorsal coloration. As in life, the white ventral side is covered with sporadic tiny specks along the throat (Hansan et al. 2014).
Five males and five females were examined for the species description. Only one of the five males had a distinct black vocal sac. All five females displayed a whitish ventral throat and few fine speckles on the chin and base of the forelimb. Nine individuals displayed the dark X-shaped dorsal mark with similar longitudinal stripes that were described in the holotype. However, one of the nine individuals displayed spots instead of stripes towards the end of the X-marking. One individual only displayed the longitudinal lines on the left half of its body. Additionally, eight individuals displayed the distinct diagonal bars on the tarsal regions, tibias, and thighs; whereas, the other two individuals displayed faint diagonal bars (Hasan et al. 2014).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Bangladesh
Microhyla mukhlesuri occupies a variety of habitats. At the type locality, they were found under grasses on the edge of ponds in calm, cool environments, with soil that is wet and slightly loose (Hasan et al. 2014). In Myanmar, they have been recorded in bamboo forests (Poyarkov et al. 2019). Under the name M. fissipes, M. mukhlesuri has also been reported in lowland scrub forests, grasslands, agricultural lands, and urban habitats. They can be found at elevations up to 2000 m (Lau et al. 2008).
Life History, Abundance, Activity, and Special Behaviors
Microhyla mukhlesuri undergoes indirect development with free-swimming tadpoles. In captivity, a single clutch of 79 eggs was observed. This is smaller than those reported for closely related species, M. fissipes and M. okinavensis, which have reported clutch sizes of 209 - 254 and 220 - 910 eggs, respectively. It is presumed that clutch size in M. mukhlesuri is actually more similar to these closely related species and this clutch was smaller because of a smaller, young female, however, more observations are needed (Behr and Rödder 2018).
The developmental period of larvae was between 37 and 98 days, which is similar to M. fissipes and other species of this genus (Behr and Rödder 2018).
Microhyla mukhlesuri has a call duration of 0.23 - 0.31 seconds and 10 - 18 pulses per call. This is similar to M. fissipes, which has a call duration of 0.21 - 0.25 and 15 - 16 pulses per call (Payorkov et al. 2019).
Trends and Threats
Relation to Humans
Possible reasons for amphibian decline
General habitat alteration and loss
The species epithet of “mukhlesuri” is in honor of Dr. Md. Mukhlesur Rahman Khan, a late professor at the Bangladesh Agricultural University who greatly contributed to the local field of amphibian research (Hasan et al. 2014).
Behr, N., Rödder, D. (2018). “Larval development stages and husbandry of the Rice Frog Microhyla mukhlesuri Hasan et al., 2014 (Anura: Microhylidae)” Bonn zoological Bulletin, 67(2), 109-116. [link]
Garg S., Suyesh R., Das A., Jiang J., Wijayathilaka N., Amarasinghe A.A.T., Alhadi F., Vineeth K.K., Aravind N.A., Senevirathne G., Meegaskumbura M. and Biju S.D. (2019). "Systematic revision of Microhyla (Microhylidae) frogs of South Asia: a molecular, morphological, and acoustic assessment." Vertebrate Zoology, 69(1), 1-71. [link]
Hasan, M., Islam, M. M., Kuramoto, M., Kurabayashi, A., Sumida, M. (2014) “Description of two new species of Microhyla (Anura: Microhylidae) from Bangladesh” Zootaxa, 3755(5), 401-418. [link]
Lau, M.W.N., Baorong, G., van Dijk, P.P., Iskandar, D. (2008). “Microhyla fissipes”. The IUCN Red List of Threatened Species 2008: e.T135848A4210760. http://dx.doi.org/10.2305/IUCN.UK.2008.RLTS.T135848A4210760.en. Downloaded on 02 October 2018.
Poyarkov, N. A., Jr, Gorin, V. A., Zaw, T., Kretova, V. D., Gogoleva, S. S., Pawangkhanant, P., Che, J. (2019) “On the road to Mandalay: contribution to the Microhyla Tschudi, 1838 (Amphibia: Anura: Microhylidae) fauna of Myanmar with description of two new species.” Zoological Research, 40(4), 1-33. [link]
Yuan, Z.-H., Suwannapoom, C., Yan, F., Poyarkov Jr., N.A., Nguyen, SN, Chen, H.-M., Chomde, S., Murphy, R.W., Che, J. (2016). "Red River barrier and Pleistocene climatic fluctuations shaped the genetic structure of Microhyla fissipes complex (Anura: Microhylidae) in southern China and Indochina." Current Zoology, 62(6), 531-543. [link]
Originally submitted by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (2021-12-13)
Description by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Distribution by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Life history by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Trends and threats by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Relation to humans by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Comments by: Andrew Goffinet, Alexis Martinez, Jacqueline Fukumoto (updated 2021-12-13)
Edited by: Ann T. Chang (2021-12-13)
Species Account Citation: AmphibiaWeb 2021 Microhyla mukhlesuri: Mukhlesur's Narrow-mouthed Frog <https://amphibiaweb.org/species/8124> University of California, Berkeley, CA, USA. Accessed Jul 6, 2022.
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Citation: AmphibiaWeb. 2022. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 6 Jul 2022.
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