Eleutherodactylus maculabialis Grünwald, Reyes-Velasco, Franz-Chávez, Morales-Flores, Ahumada-Carrillo, Rodriguez & Jones, 2021
English name: Spot-lipped Trilling Frog. Spanish name: Rana trinadora de labios manchados.
|Species Description: Grünwald CI, J Reyes-Velasco, H Franz-Chávez, KI Morales-Flores, IT Ahumada-Carrillo, CM Rodriguez, and JM Jones. 2021. Two new species of Eleutherodactylus (Anura: Eleutherodactylidae) from Southern Mexico, with comments on the taxonomy of related species and their advertisement calls. Amphibian & Reptile Conservation 15: 1–35 (e272).|
Eleutherodactylus maculabialis has a wide variety of distinguishing traits that help to distinguish it from other species of Eleutherodactylus. The main features E. maculabialis possesses that differentiate it from other Eleutherodactylus species is a very small, indistinct tympanum that lacks a visible tympanic annulus, a compact and raised lumbar gland above the inguinal region, and a distinctive ventral epidermis that is not clear with non-white visceral peritoneum and abdominal vein. This species also displays expanded digital tips, which are more than 1.5 times the width of the narrowest part of finger three and four that differentiate it from other members of the Eleutherodactylus modestus species group. The inguinal gland that is barely visible in life in E. maculabialis differentiates from other members of the Eleutherodactylus nitidus species group, of which it is a part of. More specifically, this gland is absent from E. erythrochomus, E. nebulosus and E. pipilans but distinct in all other members (Grünwald et al. 2021).
In life, the dorsum is variable and ranges from orange, tan, reddish-tan, to brown. The dorsum also has pairs of dark brown mottling patches that become increasingly dense as it approaches the middorsal area. The loreal region has a dark brown background color with large orange to white spots on the lower region near the upper labia and on the upper labia. There is an interorbial bar that is of similar color as the lightest parts of the dorsum. The flanks transition to a lavender or grey coloration toward the belly and have dark brown mottling with small white spots. The fore- and hind limbs have irregular brown transverse bars. There are flash colors in the groin area. The ventrum is grey with orange and white spots on the throat and upper chest. White marbling may also be present on the ventrum. The ventrum is partially translucent and the visceral peritoneum is clear. In preservative, the dorsum becomes light brown and the markings remain darker. The throat becomes light brown while the rest of the ventrum becomes white (Grünwald et al. 2021).
Eleutherodactylus maculabialis had slight variations in relative finger pad size and coloration and patterning (Grünwald et al. 2021).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Mexico
Life History, Abundance, Activity, and Special Behaviors
Eleutherodactylus maculabialis has a short trill call type with a dominant frequency of 3.28 ± 532.5 kHz. Calls lasted 212.5 ± 20.55 ms, with a call interval of 19.87 ± 4.28 and a call rate of 5.49 ± 1.1 per second. The calls had a rise time of 18.5 ± 2.25 ms, and a pulse rate of 5.5 ± 0.25 (Grünwald et al. 2021).
The species can be found in sympatry with E. albolabris and E. nitidus (Grünwald et al. 2021).
Trends and Threats
PHYLOGENETIC RELATIONSHIPS:Bayesian Inference analysis of 16S rRNA was conducted for the Syrrhophus subgenus of Eleutherodactylus. However, phylogenetic relationships with E. maculabialis could not be positively identified as the species formed a polytomy with five other clades. The specific species it formed a polytomy with include E. dilatus, E. maurus, E. sentinelus, andE. syristes. It also formed a polytomy with a clade composed of E. albolabris, E. nitidus, E. orarius, E. petersi, and an undescribed species (Grünwald et al. 2021).
The etymology for this species epithet comes from the combination of the Latin words “maculatus” and “labialis”, which mean “spotted” and “lip” respectively. This name references the brightly colored spots that appear on this species' upper lip (Grünwald et al. 2021).
Grünwald, C. I., Reyes-Velasco, J., Franz-Chavez, H., Morales-Flores, K. I., Ahumada-Carrillo, I. T., Rodrıguez, C. M., Jones, J. M. (2021). “Two new species of Eleutherodactylus (Anura: Eleutherodactylidae) from Southern Mexico, with comments on the taxonomy of related species and their advertisement calls.” Amphibian and Reptile Conservation 15, 1–35. [link]
Originally submitted by: Johnnie Smith (2023-01-31)
Description by: Johnnie Smith (updated 2023-01-31)
Distribution by: Johnnie Smith (updated 2023-01-31)
Life history by: Johnnie Smith (updated 2023-01-31)
Trends and threats by: Johnnie Smith (updated 2023-01-31)
Comments by: Johnnie Smith, Ann T. Chang (updated 2023-01-31)
Edited by: Ann T. Chang (2023-01-31)
Species Account Citation: AmphibiaWeb 2023 Eleutherodactylus maculabialis: English name: Spot-lipped Trilling Frog. Spanish name: Rana trinadora de labios manchados. <https://amphibiaweb.org/species/9323> University of California, Berkeley, CA, USA. Accessed Jun 5, 2023.
Feedback or comments about this page.
Citation: AmphibiaWeb. 2023. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 5 Jun 2023.
AmphibiaWeb's policy on data use.