Hoplobatrachus litoralis Hasan, Kuramoto, Islam, Alam, Khan & Sumida, 2012
Bangladesh Coastal Bullfrog
|Species Description: Hasan M, Kuramoto M, Islam MM, Alam MS, Kahn MR, Sumida M. 2012. A new species of Hoplobatrachus (Anura, Dicroglossidae) from the coastal belt of Bangladesh. Zootaxa 3312: 45-48.|
© 2012 Masayuki Sumida (1 of 2)
Hoplobatrachus litoralis is morphologically similar to its sympatric sister species H. tigerinus and the related H. rugulosus. However, H. litoralis have more distinct dark bands running from the anterior corner of the eye to the upper jaw through the nostril, and along the lateral margin of the upper jaw (Hasan et al. 2012). Hoplobatrachus litoralis was also reported to have a shorter snout to vent length than H. tigerinus. The few findings of H. litoralis individuals in India were confirmed using genetic comparisons rather than solely morphology (Hasan et al. 2012; Kundu et al. 2020).
In life, the dorsum is yellow to dark brown and is marked with dark brown to black spots. There is a yellow to white vertebral stripe that extends from the tip of the snout to the vent. Black bands extend from the anterior eye to the lateral margin of the upper jaw as well as under the eyes. The tympanum is dark gray with a pale center. The hind limbs have large black bands and black spots with yellow reticulations connecting them. The ventrum is white, except for black spots around the lower jaw and at the base of the forelimbs. In preservative, the patterning remains the same, but the dorsal coloration becomes gray (Hasan et al. 2012).
Males have a pair of gray subgular vocal sacs on the underside of the jaw and a well-developed nuptial pad on the base of the first finger. Some frogs lack stripes down the middle of the dorsal side. The number and size of dark spots along the region of the lower jaw varies or are even sometimes completely lacking (Hasan et al. 2012).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Bangladesh
Hoplobatrachus litoralis is found in coastal marshes, ponds, and wetlands, as well as river edges. They have thus far been found in moist, vegetated habitats. Cox’s Bazar is the upper region of the Teknaf-Ukhia peninsula of Bangladesh, which is characterized by hill streams, estuaries adjacent to mountains, and forest (Hasan et al. 2012).
Life History, Abundance, Activity, and Special Behaviors
To attract females, male H. litoralis emit a low-pitched sound that occurs in four second intervals that generally last for thirty seconds, which sound like rapidly repeating pulses. The frequency of their call is within 0.30 kHz, which is a low frequency sound suggesting that they are more sensitive to vibration to recognize conspecifics (Hasan et al. 2012).
Hoplobatrachus litoralis has been bred with H. tigerinus in the lab to produce viable young, however, their hybrids yield lower densities of spermatozoa. Viable, fertile hybrids - although less fit - suggest that a behavioral reproductive isolation method is occurring between these two sympatric species. Crosses between these species and their close relative H. rugulosus did not produce viable offspring, aligning with the greater genetic difference between H. rugulosus and H. litoralis than between H. tigerinus and H. litoralis. Due to the overlap in distribution of H. litoralis and H. tigerinus, the separation of these two species is less distinct, and possibly more recent (Hasan et al. 2017).
Hoplobatrachus litoralis have indirect development in its reproductive cycle (Hasan et al. 2017).
Tadpoles from the genus Hoplobatrachus are known for being mainly carnivorous, and feed on eggs of Microhylid frogs (Vitt and Caldwell 2014).
Trends and Threats
Relation to Humans
Possible reasons for amphibian decline
General habitat alteration and loss
Divergence in Cytb and 16s rRNA sequences of the mitochondrial genome were used to confirm a significant enough genetic distance between H. litoralis and H. tigerinus to warrant a new species description. Maximum Likelihood and Bayesian analyses placed H. litoralis as sister to H. tigerinus; these two species together are sister to H. rugulosus (Hasan et al. 2012; Kundu et al. 2020).
The species epithet, “litoralis” means “coastal” or “seashore” in Latin and is a reference to where the species was first found (Hasan et al. 2012).
Hasan, M., Islam, M.M., Khan, M.R., Wanichanon, R., Kurabayashi, A., Sumida M. (2017). “Reproductive isolating mechanisms in the Bangladesh coastal bullfrog Hoplobatrachus litoralis and its congeneric species revealed by crossing experiments and examination on spermatogenesis of the hybrids.” Asian Herpetological Research, 8(1):27-38. [link]
Hasan, M., Kuramoto, M., Islam, M.M., Alam, M.S., Khan, M.R., Sumida, M. (2012). “A new species of genus Hoplobatrachus (Anura, Dicroglossidae) from the coastal belt of Bangladesh.” Zootaxa, 3312, 45-48. [link]
Kundu, S., Lalremsanga, H.T., Purkayastha, J., Biakzuala, L., Chandra, K., Kumar, V. (2020) “DNA barcoding elucidates the new altitude record and range-extension of lesser-known bullfrog (Hoplobatrachus litoralis) in northeast India.” Mitochondrial DNA Part B: Resources, 5(3), 2668-2672. [link]
Purkayastha, J., Basak, S. (2018). “Hoplobatrachus litoralis (Anura: Dicroglossidae) in India.” Hamadryad, 38(1&2), 25-26. [link]
Vitt, L.J., Caldwell, J. P. (2014). Herpetology: An Introductory Biology of Amphibians and Reptiles (4th ed.). Academic Press, Elsevier, San Diego, CA.
Originally submitted by: Emma Deen, Lara Hsia, Migelle Orobia (2022-06-08)
Description by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Distribution by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Life history by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Trends and threats by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Relation to humans by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Comments by: Emma Deen, Lara Hsia, Migelle Orobia (updated 2022-06-08)
Edited by: Ann T. Chang (2022-06-08)
Species Account Citation: AmphibiaWeb 2022 Hoplobatrachus litoralis: Bangladesh Coastal Bullfrog <https://amphibiaweb.org/species/7826> University of California, Berkeley, CA, USA. Accessed Dec 5, 2022.
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Citation: AmphibiaWeb. 2022. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 5 Dec 2022.
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