AMPHIBIAWEB
Limnonectes ferneri
Ferner's Fanged Frog
family: Dicroglossidae
subfamily: Dicroglossinae

View distribution map using BerkeleyMapper.


Conservation Status (definitions)
IUCN (Red List) Status
CITES No CITES Listing
Other International Status None
National Status None
Regional Status None

   

Description

Limnonectes ferneri can be distinguished from other species of Philippine Limnonectes and from L. kuhlii and L. asperatus (morphologically similar congeners from Indonesia) by the following combination of characters: moderately large body size (reaching 84.3 mm SVL for males, 69.3 mm SVL for the single female specimen); fully visible tympanum with a prominent, rugose supratympanic fold; foot webbing extensive and rugose; rounded snout; Finger I > Finger II; having smooth to rugose dorsal skin with radial dense clusters of white-tipped dorsal asperities; dorsal folds/ridges absent; odontoid process of moderate length (2.7 mm for males, 1.1 mm for females).

Description: Robust body, with head broader than body. Snout is rounded in both dorsal and lateral view. Canthus rostralis is laterally concave when viewed from above and the loreal region is flat. Nostrils oriented posterolaterally, with a slightly convex internarial region. Upper lip is somewhat swollen, forming a protuberant ridge towards the angle of the jaw. Tympanic annulus is distinct and bordered dorsally by a protuberant, rugose supratympanic fold. Interorbital region is rugose. Pupil is horizontally elliptical. Tongue is elongated and anteriorly tapered, and attached broadly at the anterior. Choanae are tear-shaped (with the narrow point posterolateral) and placed at the anterolateral edge of the palate, widely separated. Distinct dentigerous process of vomer, having seven teeth on each side. Odontoid process is distinct with pointed tips. Forearms are hypertrophied. Fingers are robust, lacking webbing, with slightly expanded terminal discs and relative finger length I=III>IV>II. Subarticular tubercles are prominent and convex, with one subarticular tubercle present underneath fingers I and II, and two tubercles underneath fingers III and IV. No supernumerary tubercles are present. Thenar and palmar tubercles are large, elongated, and ovoid. Toes have moderately expanded terminal discs, bearing circummarginal grooves. Well-developed subarticular tubercles are present. Relative length of toes IV>V>III>II>I. Webbing formula on foot I 0–0+ II 0–0+ III 0–0+ IV 0+–0+ V. Toe V has postaxial flap of skin running along entire outer edge. Inner metatarsal tubercle is prominent, elongated, and ovoid, with a sharp and spade-like ventral edge; the outer metatarsal tubercle is absent. The heel has white dermal asperities. No tarsal folds or flaps are present. Dorsal skin on head and trunk bears dermal asperities (concentrated on posterior 2/3 of dorsum and eyelids), ranging from tiny to large, and clustered tubercles capped with white-tipped dermal asperities. Irregular low ridges are found on the dorsum, particularly on the dorsolateral surfaces, but do not span the entire body length. Limbs are tuberculate dorsally and smooth ventrally and laterally. Flanks are shagreened. The cloacal area is wrinkled and has densely clustered white dermal asperities.

The coloration in life was not recorded. In preservative the head, body, and limbs are a uniform dark chocolate brown with white asperities. Dorsal surfaces of limbs have transverse, irregular light brown blotches. No interorbital bar is present. Tympanum is dark brown to black in the center. Lips are uniform brown except for irregular lighter brown blotches on the lower lip. Lower eyelid is light brown around the periphery and has a light blue-gray center. Flanks are dark brown. Venter is lighter and mottled. White blotches present on ventral surface across margin between upper arm and forearm. Dorsal surfaces of hands and feet are dark brown with light brown blotches present above each phalangeal articulation. Throat is marbled, lighter than dorsum. Anterior chest has light brown to tan bar. Forelimbs are mottled. Ventral thighs are mottled. Tibia and tarsus are darker brown. Palmar and plantar surfaces of hands and feet are dark brown with gray subarticular tubercles. Foot webbing is mottled.

Distribution and Habitat

Country distribution from AmphibiaWeb's database: Philippines

View distribution map using BerkeleyMapper.
This species is known only from the Simulaw River Drainage on Mt. Pasian, Municipality of Monkayo, Davao Del Norte Province, Mindanao Island, the Philippines. It was collected on rocks and muddy river banks in disturbed primary forest of the PICOP Forest Reserve.

Life History, Abundance, Activity, and Special Behaviors
Breeding behavior has not yet been observed. Nuptial asperities were not present in the two males collected (in May 1994), but it is not known whether this is characteristic of the species or simply reflects sampling during non-breeding season. Other species found nearby were Ansonia muelleri, Kalophrynus pleurostigma, Limnonectes leytensis, Limnonectes magnus, Limnonectes parvus, Megophrys stejnegeri, Occidozyga laevis, Philautus leitensis, Platymantis cf. dorsalis, and Rana grandocula.

Trends and Threats
This species can tolerate some habitat disturbance, since it was found in selectively logged forest.

Comments
Limnonectes ferneri is named for John W. Ferner, in recognition of his many contributions to Philippine herpetology.

References
 

Siler, C. D., McVay, J. D., Diesmos, A. C., and Brown, R. M. (2009). ''A new species of fanged frog, genus Limnonectes (Amphibia: Anura: Dicroglossidae) from southeast Mindanao Island, Philippines.'' Herpetologica, 65, 105-114.



Written by Kellie Whittaker (kwhittaker AT berkeley.edu), UC Berkeley
First submitted 2011-08-29
Edited by Kellie Whittaker (2011-08-29)



Feedback or comments about this page.

 

Citation: AmphibiaWeb: Information on amphibian biology and conservation. [web application]. 2014. Berkeley, California: AmphibiaWeb. Available: http://amphibiaweb.org/. (Accessed: Jul 23, 2014).

AmphibiaWeb's policy on data use.