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Family: Centrolenidae
Grainy Cochran Frog, more... (es: Rana De Cristal, Rana De Vidrio)
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Adult: Species descriptions based on Ibanez et al (1999) and Savage (2002). Small frog, males to 29 mm, females to 32 mm. Dorsal: Dorsal surface dark green and granular. Granules appear as small white spots; some black spots may also be present on the dorsal surface. Ventral: Ventral surface pale white. The liver appears red in this species. Eye: Iris pale grey-gold. Extremities: Feet are moderately webbed. Egg: Clutches of 50-60 eggs are deposited in a single layer on the upper surfaces of leaves near the tip (Starrett 1960, McDiarmid 1975, Savage 2002). The eggs of Cochranella granulosa are black and white (Savage 2002). Tadpole: Tadpoles have an elongate body with a long, thin tail and small fins (Starrett 1960, Savage 2002). The tip of the tail sometimes has dark flecking or spots (Savage 2002). The mouth is oriented ventrally and has two upper (one partial) and three lower teethrows (Starrett 1960). Tadpoles appear pink or red due to large amounts of hemoglobin in the blood (Savage 2002). Centrolenid tadpoles are fossorial, living in the low-oxygen environment under mud and leaf litter in stream bottoms (McDiarmid and Altig 1999). Habitat: Lowland and premontane forest to 1500 m. Cochranella granulosa is associated with primary forest (Furlani et al 2009). Call: A rapid creek, creek, creek (Ibanez et al 1999, Savage 2002). Karyotype: 2N = 20 (Duellman 1967) Type locality: Los Diamantes one mile south of Guápiles, [Cantón de Pococí, Provincia Limón,] Costa Rica Diagnostic description: The back is solid color or with some black spots, large spots. No dorsal fold in the head; without fleshy fold on the roof of the mouth. Usually without enlarged parotid glands, but if present. Head lacking ridges. The belly is transparent in living specimens, which will allow the internal organs. Green Bones in live specimens. A conspicuous lack tarsal tubercle, and the leg lacks tarsal fold. They have legs with five toes. No two elongated inner tubers, such as shovels, with a free margin. Lack fleshy fold or along the posterior margin of the arms or legs shoulder. Without a pair of fleshy protrusions on the dorsal terminal finger region. They have a small digital groove, which separates the upper surface of the finger and bearing, at least in the two outer fingers and toes of the foot. Ventral disk lacks. The fingers are usually membranes. Cartilage interlayer present between the last phalanges of the fingers. The talus and calcaneus are fused. The terminals are fastened straight or T or Y have vomerine teeth. The muzzle has a strongly obtuse profile. Habitat: They live in the tropical wet forest. Generally located along streams with dense riparian vegetation hanging over the water. In Hitoy Cerere found between the leaves of the trees located on the banks of small creeks with little current. Food: They feed on small insects like flies and crickets. Behavior:They are nocturnal and arboreal. Relationships: Cahuita National Park Near a female of a crab grápsido (observed Sesarma roberti ) alimentádose of the egg mass which was located on a piece of cocoa. The crab consumed 16 of the 58 embryos present in the egg mass (7:35 pm.). At 10: 35 pm. crab had consumed 75% of the egg mass. Distribution in Costa Rica: In wetlands, lower and middle of the Atlantic slope, center and south of the Pacific slope, and gallery forests south of Guanacaste, between 40 and 1,500 m. Lift (Savage 2002). Distribution outside Costa Rica: They are in the Caribbean slope of Nicaragua and Costa Rica. Also in the low lands of southwest Costa Rica. |
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