{{Short description|Species of amphibian}} {{Speciesbox | status = CR | status_system = IUCN3.1 | status_ref = <ref name="iucn status 15 November 2021">{{cite iucn |author=IUCN SSC Amphibian Specialist Group |date=2018 |title=''Alexteroon jynx'' |volume=2018 |article-number=e.T56088A95747724 |doi=10.2305/IUCN.UK.2018-1.RLTS.T56088A95747724.en |access-date=15 November 2021}}</ref> | taxon = Hyperolius jynx | authority = (Amiet, 2000) | synonyms = * ''Alexteroon jynx'' <small>Amiet 2000</small><ref name="Amiet 2000"/> | synonyms_ref = <ref name=Frost/> | range_map = {{Location map | Cameroon | relief = yes | caption = | alt = Rumpi Hills in Cameroon | lat_deg = 4.833 | lon_deg = 9.117 }} | range_map_caption = ''Alexteroon jynx'' is only known from the Rumpi Hills in Cameroon }}

'''''Hyperolius jynx''''' is a species of frog in the family Hyperoliidae.<ref name=Frost/><ref name="Ernst et al. 2021"/> It is endemic to the Rumpi Hills in south-western Cameroon.<ref name="iucn status 15 November 2021" /><ref name=Frost/><ref name="Ernst et al. 2021"/> The common name '''smooth egg-guarding frog''' has been proposed for this species.<ref name=Frost/><ref name="Channing and Rödel 2019"/>

==Description== ''Hyperolius jynx'' grow to {{convert|23|mm|in|1|abbr=on}} in snout–vent length. The body is slender while the head is broad with a rounded snout. The eyes are large. The tympanum is distinct. The finger and toe tips are enlarged into rounded discs; the fingers have basal webbing while the toes have complete webbing. Dorsal skin is granular. The dorsum is yellowish to dark green to green-brown with numerous tiny white spots. There is a reddish-brown spot between the eyes and blotches on the dorsum and limbs; there may reddish-brown spots on the eyelids and the sides of the snout. Skin is ventrally finely granular; the {{Linktext|pectoral}} region is white while the posterior part of the belly is translucent turquoise, with the inner organs visible through the skin.<ref name="Channing and Rödel 2019"/>

The male advertisement call is a single blunt, metallic "click" that is repeated irregularly.<ref name="Channing and Rödel 2019"/>

==Habitat and conservation== ''Hyperolius jynx'' is known from forests on the eastern slopes of the Rumpi Hills at elevations of {{convert|800|–|1050|m|abbr=on}} above sea level. Its favoured streams have well-aerated, flowing (but not torrential) water. Males call from dense vegetation near streams. The eggs are probably laid in small clumps on leaves above streams, into which the tadpoles fall and develop further.<ref name="iucn status 15 November 2021" />

This species is only known from two localities 6&nbsp;km apart. Severe forest loss caused by smallholder farming activities, logging, and human settlement is taking place in the Rumpi Hills. Because of its small range and ongoing habitat loss, this species is considered "critically endangered".<ref name="iucn status 15 November 2021" />

==References== {{Reflist|30em|refs= <ref name="Amiet 2000">{{cite journal |last1=Amiet |first1=J. L. |year=2000 |url=http://alytes.mnhn.fr/article.php?id=74 |title=Les ''Alexteroon'' du Cameroun (Amphibia, Anura, Hyperoliidae) |journal=Alytes |volume=17 |issue=3–4 |pages=125–164 |language=fr}}</ref>

<ref name="Channing and Rödel 2019">{{cite book |title=Field Guide to the Frogs & other Amphibians of Africa |last1=Channing|first1=Allan |last2=Rödel |first2=Mark-Oliver |name-list-style=amp |year=2019 |publisher=Struik Nature |location=Cape Town |isbn=978-1-77584-512-6 |pages=168–169 }}</ref>

<ref name="Ernst et al. 2021">{{cite journal |last1=Ernst |first1=Raffael |last2=Kehlmaier |first2=Christian |last3=Baptista |first3=Ninda L. |last4=Pinto |first4=Pedro Vaz |last5=Branquima |first5=Makaya Futuro |last6=Dewynter |first6=Maël |last7=Fouquet |first7=Antoine |last8=Ohler |first8=Annemarie |last9=Schmitz |first9=Andreas |name-list-style=amp |title=Filling the gaps: The mitogenomes of Afrotropical egg-guarding frogs based on historical type material and a re-assessment of the nomenclatural status of ''Alexteroon'' Perret, 1988 (Hyperoliidae) |journal=Zoologischer Anzeiger |date=2021 |volume=293 |pages=215–224 |doi=10.1016/j.jcz.2021.06.002}}</ref>

<ref name=Frost>{{cite web |url=https://amphibiansoftheworld.amnh.org/Amphibia/Anura/Hyperoliidae/Hyperoliinae/Hyperolius/Hyperolius-jynx |title=''Hyperolius jynx'' (Amiet, 2000) |author=Frost, Darrel R. |year=2022 |work=Amphibian Species of the World: An Online Reference. Version 6.1 |publisher=American Museum of Natural History |doi=10.5531/db.vz.0001 |access-date=12 January 2022 }}</ref> }}

{{Taxonbar|from=Q110539278|from2=Q1943094}}

jynx Category:Frogs of Africa Category:Amphibians of Cameroon Category:Endemic fauna of Cameroon Category:Amphibians described in 2000 Category:Taxa named by Jean-Louis Amiet Category:Taxonomy articles created by Polbot