Eleutherodactylus Campi
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''Eleutherodactylus cystignathoides'', also known as the Rio Grande chirping frog, Mexican chirping frog, or lowland chirping frog, is a small eleutherodactylid frog. It is found from the southern United States in Texas, and in the northeastern Mexico in the states of
Nuevo León Nuevo León () is a state in the northeast region of Mexico. The state was named after the New Kingdom of León, an administrative territory from the Viceroyalty of New Spain, itself was named after the historic Spanish Kingdom of León. With a ...
, Tamaulipas,
San Luis Potosí San Luis Potosí (), officially the Free and Sovereign State of San Luis Potosí ( es, Estado Libre y Soberano de San Luis Potosí), is one of the 32 states which compose the Federal Entities of Mexico. It is divided in 58 municipalities and i ...
, Hidalgo, and Veracruz. Its range in Texas has expanded because of transport in potted plants, and there is also a likely introduced population in Louisiana.


Subspecies

Two
subspecies In biological classification, subspecies is a rank below species, used for populations that live in different areas and vary in size, shape, or other physical characteristics (morphology), but that can successfully interbreed. Not all species ...
are sometimes recognized, although they are poorly delineated: Only ''Eleutherodactylus cystignathoides campi'' occurs in Texas.


Description

Adult males measure and adult females in snout–vent length. The snout is pointed and the body is flat and elongated. Tympanum is visible. The finger tips are slightly expanded. Dorsal skin is weakly pustular, that of venter is smooth to areolate. Dorsal coloration is variable (brown, gray, or yellow-green) and includes dark spots. Ventral skin is translucent. The hind limbs have dark crossbars.


Behavior

Both males and females produce calls, which is rare in anurans. Moreover, male and female calls are remarkably similar. A smaller proportion of females compared to males were observed calling in two Mexican populations. Moreover, calling females were, on average, smaller than non-calling females. The function of female calling is not known, but it might function as an advertisement, similarly as the male calls. Males appear to be territorial.


Reproduction

Reproduction is terrestrial and direct, without a free-living larval stage. Under laboratory conditions, eggs are laid just under the soil surface. Clutch size is 5–13 eggs measuring in diameter. The eggs hatch as froglets that measure approximately .


Habitat and conservation

''Eleutherodactylus cystignathoides'' occurs at low elevation coastal plains and at low to moderate elevations in foothills. Individuals can be found in moist shaded vegetation, palm groves, thickets, ditches, resacas, lawns, and gardens. Many records are from urban settings. They can hide under cover objects during the day. They have been observed to utilize arboreal perches above the ground. This species is quite common throughout its range and no major threats to it are known; rather, they appear to thrive in the presence of humans. Its Mexican range includes Sierra del Abra-Tamchipa and El Cielo Biosphere Reserves.


References


External links


ARMI Atlas: ''Eleutherodactylus cystignathoides''
{{DEFAULTSORT:Eleutherodactylus Cystignathoides cystignathoides Amphibians of Mexico Amphibians of the United States Fauna of the Rio Grande valleys Amphibians described in 1877 Taxa named by Edward Drinker Cope