Hyperolius spinigularis

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Hyperolius spinigularis
Hyperolius spinigularis.gif
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Hyperoliidae
Genus: Hyperolius
Species:
H. spinigularis
Binomial name
Hyperolius spinigularis
Stevens, 1971 [2]

Hyperolius spinigularis is a species of frog in the family Hyperoliidae. [1] [3] [4] [5] It is found in the Mulanje Massif in southern Malawi and the Namuli Massif in adjacent Mozambique. [1] [3] Records from Tanzania refers to other species. [3] Males of this species have characteristic small spines during the breeding season. [2] [4] [5] Its common names are spiny-throated reed frog, spiny reed frog, and Mulanje reed frog. [3] [4]

Contents

Taxonomy

Hyperolius spinigularis was described in 1971 based on the type series collected in Malawi, although it was already then noted that "a rather similar frog" had been collected in Tanzania. [2] Subsequent research established a broad distribution in Tanzania, Malawi, and Mozambique, although there were doubts whether all populations represented just a single species. Molecular genetic analyses published in 2015 confirmed that the Tanzanian populations represented species different from H. spinigularis and resulted in restricting this species to Malawi and Mozambique. The new species, previously confused with H. spinigularis, are Hyperolius burgessi , Hyperolius davenporti , and Hyperolius ukwiva . [3]

Description

Males measure 19–23 mm (0.75–0.91 in) and females 24–31 mm (0.94–1.22 in) in snout–vent length. In addition to sexual dimorphism in size, males can be distinguished during the breeding season by the presence of prominent black asperities (spines) that cover the throat, mentum, abdomen, and undersurfaces of the hind limbs. The head is broad and has protruding eyes; the pupil is horizontally elliptic. All females and most males are pale apple-green and dorsally covered with minute brown chromatophores that under certain light conditions can almost mask the ground colouration. The ventrum is a pale translucent blue-green, becoming silvery white over the abdomen and an opaque blue-green on the gular disc. The hands and feet are pale yellow. However, a small fraction of males have red-brown ground coloration on both the dorsum and ventrum, with the extremities of the limbs being pale red. Also the pale cream or white dorsal patterning is variable but unrelated to sex. A white cantho-dorso-lateral band is the most common type, while some individuals have only an irregular and often broken dorso-lateral band, as well as a sub-triangular frontal patch. [2]

Newly metamorphosed froglets measure 12.7–14.1 mm (0.50–0.56 in) SVL. [2]

Ecology and behaviour

The breeding season is short, from late December to mid March, during the last rains. Males appear on the breeding sites before females. Vocalization were not observed in the natural habitat, even though captive males were occasionally observed to vocalize. The eggs are deposited on leaves above water. One female was observed to return to her eggs and to eject watery fluid over the egg mass from her vent. [2]

Hibernation has been observed in captive specimens. Prior to hibernation, frogs lose interest on food and become less active, before finally concealing themselves among the roots of grasses near the waterline. They position themselves head uppermost, often with the hind parts touching the water or even partly submerged. This behaviour has not been observed in the field, but its timing in captive specimens coincides with the disappearance of frogs from their breeding sites in the wild. [2]

Habitat and conservation

Hyperolius spinigularis occurs in forest and dambo habitats at elevations of 690–1,250 m (2,260–4,100 ft) above sea level. Breeding takes place in seasonal and permanent pools. [1]

The species is relatively common in Malawi; its abundance in Mozambique is unknown. It is affected by large-scale habitat loss caused by deforestation and agricultural expansion, including the use of fire for habitat conversion. The International Union for Conservation of Nature (IUCN) has assessed it as "Vulnerable". [1]

Related Research Articles

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<i>Afrixalus crotalus</i> Species of amphibian

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<i>Afrixalus delicatus</i> Species of amphibian

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<i>Hyperolius concolor</i> Species of amphibian

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<i>Hyperolius glandicolor</i> Species of frog

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<i>Hyperolius guttulatus</i> Species of frog

Hyperolius guttulatus is a species of frog in the family Hyperoliidae. It occurs in West and Middle Africa between Sierra Leone in the west and Gabon in the east/south. Common name dotted reed frog has been coined for this species.

<i>Hyperolius marginatus</i> Species of frog

Hyperolius marginatus is a species of frog in the family Hyperoliidae. It has been recorded from the eastern Democratic Republic of the Congo, Tanzania, Malawi, Mozambique, Zambia, and Zimbabwe. However, the limits of its distribution are very uncertain, and it is likely to occur in Burundi and Rwanda too. Common names coined for this species include margined sedge frog and margined reed frog.

<i>Hyperolius minutissimus</i> Species of frog

Hyperolius minutissimus is a species of frog in the family Hyperoliidae. Its common names are tiny reed frog and dwarf reed frog. It is endemic to Tanzania and known from the Udzungwa Mountains and from near Njombe in the Southern Highlands.

<i>Hyperolius mitchelli</i> Species of amphibian

Hyperolius mitchelli is a species of frogs in the family Hyperoliidae. It is found in the area between northeastern Tanzania, Malawi, and central Mozambique.

<span class="mw-page-title-main">Pickersgill's reed frog</span> Species of amphibian in the family Hyperoliidae endemic to South Africa

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<i>Hyperolius picturatus</i> Species of frog

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<i>Hyperolius pusillus</i> Species of amphibian

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Hyperolius sheldricki is a species of small frog in the family Hyperoliidae. It is endemic to southeast Kenya. The type locality is in the Tsavo East National Park.

<i>Hyperolius swynnertoni</i> Species of frog

Hyperolius swynnertoni is a species of frog in the family Hyperoliidae. It is found in the southern portion of the eastern Zimbabwe uplands and adjacent Mozambique. It is also known as the Swynnerton's reed frog, with the subspecies "broadleyi" as the Broadley's tree frog or Broadley's forest treefrog.

<i>Hyperolius tanneri</i> Species of amphibian

Hyperolius tanneri is a species of frogs in the family Hyperoliidae. It is endemic to the West Usambara Mountains in northeastern Tanzania. Common name Tanner's reed frog has been coined for this species.

Hyperolius torrentis is a species of frog in the family Hyperoliidae. It is known from the Akwapim-Togo Ranges along the border between Ghana and Togo as well as from northeastern Benin. Common name Ukami reed frog has been coined for this species.

Hyperolius wermuthi is a species of frog in the family Hyperoliidae. It is found in Ivory Coast, southern Guinea, and Liberia. The correct name for this species is likely Hyperolius soror. It is so similar to Hyperolius fusciventris that it has likely been overlooked elsewhere in West Africa. Common name Wermuth's reed frog has been coined for this species.

References

  1. 1 2 3 4 5 IUCN SSC Amphibian Specialist Group (2016). "Hyperolius spinigularis". IUCN Red List of Threatened Species . 2016: e.T69119640A69119416. doi: 10.2305/IUCN.UK.2016-1.RLTS.T69119640A69119416.en . Retrieved 15 November 2021.
  2. 1 2 3 4 5 6 7 Stevens, R. A. (1971). "A new tree-frog from Malawi (Hyperoliinae, Amphibia)". Zoologica Africana. 6 (2): 313–320. doi: 10.1080/00445096.1971.11447423 .
  3. 1 2 3 4 5 Frost, Darrel R. (2016). "Hyperolius spinigularis Stevens, 1971". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 29 October 2016.
  4. 1 2 3 "Hyperolius spinigularis Stevens, 1971". African Amphibians. Retrieved 30 October 2016.
  5. 1 2 "Hyperolius spinigularis". AmphibiaWeb: Information on amphibian biology and conservation. [web application]. Berkeley, California: AmphibiaWeb. 2008. Retrieved 30 October 2016.
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