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Alexteroon hypsiphonus

Alexteroon hypsiphonus, also known as the cross-banded egg-guarding frog, is a species of tree frog native to the rainforests of southern Cameroon, Gabon, Equatorial Guinea, the western Republic of the Congo, and northwestern Angola. This slender frog is distinguished by its lichen-like, granular skin that changes color from gray to dark brown, numerous black dots, and three distinctive black-bordered, reddish-brown bands. It is an arboreal species that lays its eggs on leaves above small ponds, providing a unique form of parental care as the tadpoles eventually fall into the water below.

Key Facts

  • Found in rainforests near rivers in Central and West Africa.
  • Adults reach up to 28 MM in snout-to-vent length.
  • Features granular skin with a lichen-like pattern, changing from gray to brown.
  • Possesses three irregular, black-bordered transverse bands.
  • Eggs are laid on leaves above small ponds, with tadpoles falling into the water.
  • Threatened by habitat loss, though it is common in suitable areas.
Alexteroon hypsiphonus
Scientific Name
Alexteroon hypsiphonus
Family
Hyperoliidae
Common Names

Cross-Banded Egg-Guarding Frog

Description
Alexteroon hypsiphonus is a small frog with a slender build, measuring up to 28 mm in snout-to-vent length. It possesses a broad head with a short snout and large eyes. The tympanum is distinct. Both finger and toe tips are enlarged into prominent discs, and the webbing is well-developed on both hands and feet. The dorsal skin is granular and exhibits a lichen-like pattern, which changes from grayish during the day to dark brown at night. Numerous black dots are scattered across its back, alongside three irregular, black-bordered transverse bands that are reddish-brown or match the general dorsal coloration. The underside of the frog is a transparent whitish to turquoise color.
Habitat Description
This species inhabits rainforest environments, specifically found near rivers at elevations below 630 meters (2,070 feet). Alexteroon hypsiphonus is an arboreal frog, with males commonly observed calling from vegetation typically situated at least 5 meters (16 feet) above the ground.
Diet
The diet of Alexteroon hypsiphonus consists of small invertebrates, typical for frogs of its size and habitat. While specific prey items are not detailed, it is presumed to feed on insects and other arthropods found in its rainforest environment.
Breeding Behavior
The breeding behavior of Alexteroon hypsiphonus is characterized by a unique egg-laying strategy. Females deposit their eggs on leaves positioned above small ponds. The tadpoles eventually drop from these leaves into the water, where their development continues.
Vocalization
Males of Alexteroon hypsiphonus are known to call from vegetation, usually at a height of no less than 5 meters above the ground, indicating vocal communication plays a role in their reproductive and territorial behavior. Specific details of the call's sound or frequency are not provided.
Size Range Mm
0-28
Habitat Type

Rainforest, Riparian

Distinguishing Features
  • Granular, Lichen-Like Dorsal Skin That Changes Color
  • Three Irregular, Black-Bordered Transverse Bands
  • Enlarged Finger and Toe Discs
  • Transparent Whitish To Turquoise Belly

About Alexteroon hypsiphonus

Alexteroon hypsiphonus, commonly known as the cross-banded egg-guarding frog, is a species of tree frog native to the tropical rainforests of Central and West Africa. Its range includes southern Cameroon, Gabon, Equatorial Guinea, the western Republic of the Congo, and northwestern Angola. This species is characterized by its distinctive appearance and a specialized breeding strategy.

Description and Habitat

The frog is relatively small, with adults reaching a snout-to-vent length of up to 28 mm. It possesses a slender body, a broad head with a short snout, and large eyes. A notable feature is its granular dorsal skin, which has a lichen-like pattern that shifts from grayish during the day to dark brown at night. This coloration is further enhanced by numerous black dots and three striking, irregular, black-bordered transverse bands that are reddish-brown or match the general dorsal hue. The frog's underside is a transparent whitish to turquoise color. Alexteroon hypsiphonus is arboreal, inhabiting rainforests, typically found near rivers at elevations below 630 meters. Males often call from vegetation situated at least 5 meters above the ground.

Breeding and Conservation

The reproductive behavior of Alexteroon hypsiphonus involves an interesting egg-laying strategy where eggs are deposited on leaves above small ponds. The tadpoles later fall from these leaves into the water, suggesting a form of parental care or environmental adaptation. While the species is considered common within suitable habitats, it faces significant threats from habitat loss. Its presence has been documented in protected areas such as Lopé National Park in Gabon, indicating the importance of these reserves for its survival.

Source: Wikipedia ↗

Frequently Asked Questions

What is the scientific name of the cross-banded egg-guarding frog?

The scientific name for the cross-banded egg-guarding frog is Alexteroon hypsiphonus. It was previously classified under the genus Hyperolius.

Where can Alexteroon hypsiphonus be found?

This frog species is found in southern Cameroon, Gabon, Equatorial Guinea, the western Republic of the Congo, and northwestern Angola. It inhabits rainforests, typically near rivers.

What are the distinguishing physical features of Alexteroon hypsiphonus?

Alexteroon hypsiphonus has a slender body with a broad head and short snout. Its dorsal skin is granular with a lichen-like pattern that appears grayish during the day and dark brown at night. It also has numerous black dots and three irregular, black-bordered transverse bands.

How does Alexteroon hypsiphonus reproduce?

The breeding behavior involves females laying eggs on leaves suspended above small ponds. The tadpoles eventually fall into the water below, suggesting a unique egg-guarding strategy.

What is the conservation status of Alexteroon hypsiphonus?

While Alexteroon hypsiphonus is common in its preferred habitats, it faces threats from habitat loss. Its presence is noted in protected areas like Lopé National Park in Gabon.