Chiasmocleis leucosticta (Boulenger 1888)

Diagnosis A medium sized species of Chiasmocleis with the following combination of characters: 1) snout vent length 19.0-22.8 mm in males, 21.8-25.5 in females. 2) body trunk ovoid (3) snout short, tip slightly truncate in dorsal view, and slightly protruding in lateral profile; (4) hand and foot of male webbed, of female half webbed; (5) fingers and toes lacking disks, fringed on free parts in females; (6) fingers and toes with few, small lateral dermal spines only in males; (7) dorsal surfaces with small dermal spines; (8) in preservative, color on dorsum dark brown with small white dots irregularly distributed, and a light longitudinal mid-dorsal line; (9) posterior sides of legs with a light longitudinal line; (10) venter roughly marbled in dark brown and pale cream.

Known from the Atlantic Forest in the states of São Paulo, Paraná and Santa Catarina, in southeastern and southern Brazil.

Adult morphology Size medium for the genus (snout vent length 19.0-22.8 mm in males, 21.8-25.5 in females); body trunk avoid; bead short, as broad as long; nostrils at the tip of snout, not protukrant, and directed laterally; snout short, tip slightly truncate in dorsal view, and slightly protruding in lateral profile; internaria1 distance smaller than eye to nostril distance, and only slightly smaller than eye diameter; eye diameter less than eye to nostril distance; canthus rostralis only slightly defined; loreal region oblique, flat; lips not flared; eyes small, only slightly protruding; upper eyelid width one third of the interorbital space; interorbital area flat; cranial crests and occipital fold absent; postorbital fold present; tympanum absent; upper jaw projecting beyond lower; mandible with truncate, trilobed anterior margin; tongue large, ovoid; choanae small, rounded, widely separated; a small, subgular vocal sac present. Arms slender, lacking tubercles and crests on forearm. Hand of male webbed, of female half webbed; fingers lacking disks, fringed on free parts in females, with lateral dermal spines only in males; finger length I < II < IV < III; subarticular tubercles well developed, rounded; supernumerary tubercles absent; palrmar tubercle large, divided in two parts; thenar tubercle large, rounded, at the base of finger I. Legs short, robust; knee and heel lacking tubercles; tibia! and tarsal ridges absent. Foot of male webbed, of female half webbed; toes lacking disks and fringed on free parts; toes length I < II < V < III < IV; toes with few, small lateral dermal spines in males, lacking in females; subarticular tubercles well developed, rounded; supernumerary tubercles absent; an oval inner, but no outer, metatarsal tubercle. Thigh length slightly less than tibia length; knee and elbow widely separated with limbs adpressed to sides of body; combined thigh and tibia length approximately 83 % of snout-vent length in males, 85 % in females; heels slightly superposed when flexed legs held at right angles to body; foot length approximately 66 % of snout-vent length in males, 69 % in females. Skin smooth above and beneath; dorsal and ventral surfaces of body and limbs with small, uniformly distributed dermal spines, more numerous in males. Anal opening not modified, lacking para-anal tubercles and glands around anus. Color in preservative (alcohol): dorsum dark brown with small white dots irregularly distributed; a light longitudinal mid-dorsal line meeting, above the anus, another light longitudinal line present on the posterior sides of legs. Venter roughly marbled in dark brown and pale cream; male throat infuscated. Variation Females are larger than males, with interdigital webbing less developed. In some females, a light line is present on ventral surface of arms and pectoral region, where it assumes a V-shape, crossed by a perpendicular light longitudinal mid-ventral line. Larval morphology Body elliptical and depressed (36% of the overall length), with a small constriction in the later third. The maximum width is located in the one previous third, coinciding with the width at level of the eyes and the extraocular distance. Eye in lateral position. The anterior portion of the head bears a symmetrical line, similar in structure to a lateral line and in position to an orbitonasal line or nasolacrimal groove. Mouth of terminal position, of small size and opened directed anterodorsally; it lacks oral disk, jaw and horny teeth. Two superior labial flaps with medium notch suspended on the extremities of the mouth. In dorsal view the inferior lip becomes notorious as a edge in form of U. Spiracle open on median line of ventral surface-of body and cover the anus open; anal tube short without flap The base of the tail has, as happen in other microhylid tadpoles, a peculiar thickenning, result of a particular development of the caudal dermis. Tail medium size (64% of the overall length) of maximum height similar to body. The dorsal fin is expanded and the ventral normal; tip of tail pointed to form a flagellum.

LC. Least Concern. Listed how "dados insuficientes" (DD) in the Lista Vermelha do Estado do Paraná.

Chiasmocleis leucosticta is a species of frog in the family Microhylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests and intermittent freshwater marshes. It is threatened by habitat loss.