Ischnocnema henselii (Peters 1870)

DiagnosisIschnocnema henselii is a medium-sized species of the E. guentheri cluster sensu Heyer (1984). It is characterized by a prolonged advertisement call with a duration of about 10-25 sec, consisting of a series of more than 80 notes (up to 170). In other species of the guentheri cluster, the call is much shorter, consisting of 5-10 notes, with a maximum of 35 notes with a total duration of less than 3 sec. Ischnocnema henselii is a cryptic species that is not absolutely distinguishable morphologically from I. guentheri. Although I. henselii has a rounded, slightly protruding snout profile, the snout is more sloping in I. guentheri. The throat is usually white and unmottled in I. henselii but gray mottled in I. guentheri. Other Ischnocnema species occurring syntopically with I. henselii are I. manezinho. Ischnocnema henselii is distinguished from I. manezinho by the more slender body, smaller finger discs and longer hind legs (shank length about 68-69% snout-vent length in I. henselii; 58% snout-vent length in I. manezinho).

Occurs in the subtropical Atlantic rain forest and parts of the Araucaria forest domain in southern Brazil and Province of Misiones, Argentina; at altitudes from about sea level up to 1200 m.

Herbácea

Perene

flavonóides

Sementes

Adult morphology Based on available specimens from Rio Grande do Sul and southern Santa Catarina, which are, because of their advertisement calls, referrable to I. henselii. Ischnocnema henselii is characterized by a distinct sexual dimorphism (snout-vent length 21.0-27.5 in males; 28.4-38.4 in females). Head longer than wide, its length 42.3% snout-vent length in males, 41.6% in females, its width 34.6% snout-vent length in males, 35.3% in females. Snout rounded, protruding in profile, subovoid in dorsal view. No cranial crests, canthus rostralis evident, loreal region flat and nearly vertical. Nostrils not protuberant, much closer to tip of snout than to eye. Eyes large, their diameter about 25% head length. Upper eyelids smooth or with small tubercles. Tympanum distinct, its diameter 55-60% eye diameter. Slight supratympanic ridge. Vocal sac small, single, subgular. Vocal slits present in males. Vomerine teeth in two short, narrowly separated, transverse rows, located behind and between the choanae. Skin on dorsum smooth or indistinctly granulated, usually with two weak dorsolateral glandular folds and a Y- or Wshaped glandular ridge between the shoulders.Skin on throat and venter smooth. Limbs slender,hindlegs elongated in proportion to body. Thigh length on average 61.3% snout-vent length in males, 62.0% in females; tibia length 67.9% snout-vent length in males, 69.2% in females; and foot length snout-vent length 60.1% SVL in males, 60.8% in females. Fingers lacking webbing and lateral fringes but possessing fine dermal ridges laterally. Finger discs distinct, their width about 1.2-1.5 times finger width. Relative lengths of fingers I = II < IV < III. Subarticular tubercles distinct, rounded and moderately raised. Large, oval, moderately raised outer and inner metacarpal tubercles. Indistinct, cream nuptial asperities on the inner base of the first finger in males. Toes not webbed, laterally fringed. Relative lengths of toes I < II < V < III < IV. Foot texture smooth with rounded, raised subarticular tubercles. Inner metatarsal tubercle elliptical, protruding; outer metatarsal tubercle small, rounded. Tarsal fold absent. Color in life: Dorsal coloration extremely variable, reddish, orange, grayish-, or yellowish-brown, uniform or with symmetrical pattern of indistinct dark markings and lines. Some specimens with white middorsal pin stripe or broad line. Dorsal region of the snout usually light brown, contrasting with the darker brown coloration on loreal region and dorsum. Distinct pattern of dark and light brown vertical bars on upper lip; below eye always a dark broad vertical bar. With or without dark interorbital stripe or bar. Black triangular blotch above tympanum, sometimes posteriorly extended to the groin. Usually two small black inguinal blotches. Hind legs brownish with 3-5 dark cross-bars. Forearms with a few indistinct brown blotches. Belly and throat dirty yellow or white, unmottled. Posterior surface of thigh yellowish, uniform or indistinctly marbled with brown. Outer shank usually with broad dark stripe, sometimes incomplete or interrupted. Coloration in preservative with similar variation: The coloration varies as described above. Most specimens are uniformly dark brown to grey or have a symmetrical dorsal body pattern of dark markings. Four (MCP 3182, 3183, 3683, 6853, SMNS 9125) out of 42 specimens from Rio Grande do Sul (about 10%) have a broad, distinct, light middorsal stripe, but most specimens are without such a stripe. Skin structure varying from smooth to slightly tuberculate. Measurements (in millimeters) of adult males (N = 45) (in millimeters, mean ± SD given in parenthesis) are as follows: snout-vent length 21.0-27.5 (24.3±1.54), head length 9.0-11.8 (10.3±0.68), greatest head width 7.0-9.5 (8.460.58), eye diameter 1.8-3.5 (2.6±0.41), tympanum diameter 1.1-1.8 (1.4±0.22), eye-nostril distance 2.2-3.9 (3.2±0.31), interorbital distance 3.7-5.4 (4.6±0.41), internarial distance 1.8-2.8 (2.3±0.25), thigh length 12.6-17.7 (14.9±1.09), shank length 14.4-18.5 (16.5±0.96), foot length 12.2-16.5 (14.6±0.86); in adult females (N = 41): snout-vent length 28.4-38.4 (33.4±2.39), head length 11.6-16.0 (13.9±1.08), greatest head width 9.8-14.1 (11.8±0.96), eye diameter 2.3-4.4 (3.3±0.45), tympanum diameter 1.6-2.9 (2.0±0.25), eye-nostril distance 3.6-5.3 (4.3±0.35), interorbital distance 4.9-7.7 (5.9±0.57), internarinal distance 2.5-3.5 (3.0±0.26), thigh length 18.1-24.3 (20.7±1.53), shank length 20.3-26.3 (23.1±1.42), foot length 17.2-23.3 (20.3±1.43). Measurements for the holotype, ZMB 6813, an adult female faded and in poor condition, are as follows: snout-vent length 32.5; head length 12.7; greatest head width 11.4; eye diameter 3.6; tympanum diameter 2.0; eye-nostril distance 3.8; interorbital distance 5.6; internarinal distance 3.0; thogh length 20.6; shank length 23.4; foot length 19.8.

LC. Least Concern.

Ano todo

Ischnocnema henselii is a species of frog in the family Brachycephalidae. It is found in subtropical rain forests in southern Brazil and northeastern Argentina (Misiones Province), and likely in adjacent Paraguay. Its natural habitat is subtropical or tropical moist lowland forests. It is listed as a species of "least concern" on the IUCN Red List of Threatened Species.

Ischnocnema henselii​​​ es una especie de anfibio anuro de la familia Brachycephalidae.

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Ischnocnema henselii Ischnocnema generoko animalia da. Anfibioen barruko Brachycephalidae familian sailkatuta dago, Anura ordenan.

Ischnocnema henselii est une espèce d'amphibiens de la famille des Brachycephalidae.

Ischnocnema henselii é uma espécie de anfíbio da família Brachycephalidae. Pode ser encontrada nas florestas de araucárias no Brasil, nos estados de Santa Catarina e Rio Grande do Sul, e na Argentina, na província de Misiones; possivelmente ocorra no Paraguai.