Microhyla heymonsi Vogt, 1911

Microhyla heymonsi Vogt, 1911 View in CoL

Materials

Type status: Other material. Occurrence: catalogNumber: IB A. 6392 ; individualCount: 1; sex: male; lifeStage: adult; occurrenceID: 140A035D-F5C3-5242-8D02-16207B6AC845; Taxon: scientificNameID: Microhyla heymonsi ; scientificName: Microhyla heymonsi ; class: Amphibia; order: Anura ; family: Microhylidae ; genus: Microhyla ; specificEpithet: heymonsi ; scientificNameAuthorship: Vogt, 1911; Location: country: Vietnam; countryCode: VN; stateProvince: Ha Nam; county: Kim Bang; municipality: Kim Bang; locality: Kim Bang SHCA ; verbatimElevation: 25 m; verbatimLatitude: 20 ° 47.689 ' N; verbatimLongitude: 105 ° 92.435 ' E; verbatimCoordinateSystem: WGS 84; Event: eventDate: 24 April 2025; eventRemarks: collected by Nguyen QT, Pham TC, Phan QT, and Pham VA; Record Level: language: en; collectionCode: Amphibians; basisOfRecord: PreservedSpecimen

Type status: Other material. Occurrence: catalogNumber: IB A. 6393 ; individualCount: 1; sex: female; lifeStage: adult; occurrenceID: D8B5F8D6-412A-51B3-A392-6ED808407436; Taxon: scientificNameID: Microhyla heymonsi ; scientificName: Microhyla heymonsi ; class: Amphibia; order: Anura ; family: Microhylidae ; genus: Microhyla ; specificEpithet: heymonsi ; scientificNameAuthorship: Vogt, 1911; Location: country: Vietnam; countryCode: VN; stateProvince: Ha Nam; county: Kim Bang; municipality: Kim Bang; locality: Kim Bang SHCA ; verbatimElevation: 29 m; verbatimLatitude: 20 ° 47.882 ' N; verbatimLongitude: 105 ° 82.237 ' E; verbatimCoordinateSystem: WGS 84; Event: eventDate: 25 April 2025; eventRemarks: collected by Nguyen QT, Pham TC, Phan QT, and Pham VA; Record Level: language: en; collectionCode: Amphibians; basisOfRecord: PreservedSpecimen

Description

Morphological characters of the specimens from Ha Nam Province agreed well with the descriptions of Bourret (1942), Manthey and Grossmann (1997), Hecht et al. (2013) and Hoang et al. (2022): SVL 19.5 mm in male (n = 1) and 23.7 mm in female (n = 1); snout profile obtusely pointed, somewhat longer than eye (RL 3.0 mm, ED 2.5 mm in male; RL 3.7 mm, ED 2.2 mm in female); interorbital distance 1.6–1.9 times broader than upper eyelid (UEW 1.3 mm, IOD 2.5 mm in male; UEW 1.8 mm, IOD 2.8 mm in female); tympanum invisible; vomerine teeth absent; tongue roundly spatulate and free at the rear half of its length; external vocal sac present in males. Fore-limb slender (HAL 8.5 mm in male and 9.8 mm in female); fingers free of webbing and tips not swollen. Hind-limb slender, tibia longer than thigh (TbL 11.5 mm, FL 9.9 mm in male; TbL 13.2 mm, FL 11.9 mm in female); toe tips round, not swollen, webbed at base; subarticular tubercle present; inner and outer metatarsal tubercles present; tibio-tarsal articulation reaching tip of snout. Dorsal skin smooth, dorsolateral edges not sharp; ventral skin smooth. Colouration in life: Dorsal surface of head and body pale grey, with a white stripe from tip of snout to cloaca and a small dark spot in the centre of the back; lateral side of head and flank dark brown to black; anterior part of thighs, cloacal region and lower parts of feet black; limbs with thin transverse bars; ventral surface white to grey (Figs 4 View Figure 4 , 5 View Figure 5 ).

Distribution

In Vietnam, this species is known from Lao Cai and Ha Giang Provinces in the north, southwards to Kien Giang and Ca Mau Provinces ( Nguyen et al. 2009, Hecht et al. 2013). Elsewhere, this species is known from China, Cambodia, Laos, Myanmar, Thailand and Malaysia ( Frost 2025).

Ecology

Specimens of Microhyla heymonsi were found on the ground near a small puddle or near small streams between 20: 00 h and 21: 30 h. Males were recorded calling at the site and tadpoles were observed in temporary water puddles. The surrounding habitat was a mixed secondary forest of small hardwood and shrubs.

Conservation

Conservation status. LC (Least Concern) ( IUCN 2025).