Ikakogi ispacue

Adult males measure between 28.7 and 30.2 millimeters, while females measure between 29.5 and 30.6 millimeters. Their snout is rounded when viewed dorsally and slightly slanted or truncated when viewed laterally, their tympanum is not visible and their eyes are large and directed anterolaterally, at an angle of approximately 45 degrees. They have no vomerine teeth and their tongue is rounded and not fully attached to the lower part of the mouth. Its canthus rostralis is rounded, its nostrils are elevated, and its choana is medium-sized and oval. The texture of its skin is smooth on the back and granular on the belly, with the presence of a pair of large, rounded, flat tubercles on the lower thigh. Its parietal peritoneum corresponds to half of the ventral surface of its belly and is covered with iridophores, while its peritoneum, which corresponds to the other half, is transparent. Adult males have humeral spines. Its liver has four lobes.^[2]

Its back is green with tiny speckled black dots, while its belly is cream, whiter in the parietal peritoneum and translucent in the visceral peritoneum. Its fingers are yellow, and the upper edge of its mouth and the side of the body are creamy-yellow, with a tiny line of white glazed dots on the flanks. Its iris is golden and has small dark brown reticulations and a darker area towards the pupil. Its bones are white on the diaphysis and pale green on the epiphysis, probably due to the accumulation of biliverdin. When they are fixed, their color changes to cream or light lavender, leaving only a few white dots of the line they have on the side. Their iris also changes, becoming silver with black reticulations.^[2]

It is morphologically similar to the adult I. tayrona, being impossible to distinguish the two species just by visual observations, requiring genetic analysis, vocalization or tadpole analysis. But it can be differentiated from other members of the Centrolenidae family by the presence of a small white line on the side of the body and white bones, which is quite unusual, occurring only in some species of the genera Centrolene, Nymphargus, and Hyalinobatrachium, and that can be identified by the visibility of the tympanum (except in some populations of C. buckleyi and C. venezuelense), which in this species is not visible. Other features that together allow discernment are the shape of its snout, the presence of humeral spines, and its coloration when alive or fixed.^[2]

Tadpoles, when seen from a dorsal perspective, have an elongated and elliptical body shape, being wider in the central region and presenting a tapered snout, and when observed from the side, the body is turned downwards. The eyes are small, located on the back and directed anterodorsally, as well as the nostrils, which are reniform and have a marginal border and a fleshy triangular projection on the sagittal margin. Its mouth is anteroventral, has no lateral borders, and is surrounded by a single row with 64 alternate, conical marginal papillae; there are no submarginal papillae. Their labial tooth row formula (FFDL) is 2(2)/3. They have mandibular sheaths, which are serrated and keratinized, with the upper jaw being arch-shaped and wider than the lower jaw, which is U-shaped. Its blowhole is small and tubular and is located in the left posterolateral region. Its cloacal tube is also tubular and is centrally located at the ventral fin, being fused to it.^[2]

They have hypervascularized skin, making their coloration pinkish or reddish. Its back is lightly pigmented with a few dark gray dots, which are more concentrated on the back of the body, between the eyes and on the tail. Its belly is transparent, and it is possible to see its organs, such as its intestine, which is also transparent, its liver, which is dark red, and its heart and circulatory system, which are light red due to the passage of blood. The musculature of its tail is reddish and there is a brownish line through a third of it in the middle of the myotomes, and its caudal fins are transparent with a few melanophores. When fixed, its coloration becomes light cream, with the melanophores and tail becoming grayish.^[2]

They can only be distinguished from the tadpoles of I. tayrona by analyzing their internal morphology, where the number of lateral papillae on the mouth floor is counted, having thirteen in total, unlike this species that has ten. They can be differentiated from other species of the family by the absence of a striking coloration when attached, by the shape of the snout and jaws, by the FFDL and by the positioning of the blowhole.^[2]

To attract females, the males vocalize on leaves of plants on the banks of streams, usually at a height of between fifty centimeters and 3.5 meters. Their vocalization is composed of the repetition of a shrill note composed of a set of eleven to twenty pulses with amplitude modulation. The duration of each note varies between 0.082 and 0.185 seconds, with the pulses lasting on average 0.007 seconds and with a short pause of less than 0.004 seconds between them. It is difficult to determine the frequency modulation, with the dominant ones being between 2,928 and 3,273 hertz, and there may be some notes at higher or lower frequencies. It can be differentiated from the vocalization of I. tayrona by the fact that the latter has three to four unpulsed notes, whose frequencies are lower, usually between 2 650 and 2 870 hertz.^[2]

After the female chooses the males, they perform the amplexus, and then she lays her eggs in a single gelatinous mass on plant leaves hanging down toward the stream. Each clutch contains between 48 and 62 eggs, which range in color from light cream to light green and are arranged in a ring shape. The developing embryos have cranial hypervascularization, making them pinkish or reddish in color. Their hearts are transparent, but due to blood circulation they take on a reddish tint. Their eggs, after hatching, give rise to tadpoles, which are usually found under sand or fallen leaves in puddles along the edge of the stream, with an area between one and two square meters and depth between thirty and fifty centimeters. Due to their morphological characteristics, it is thought that they may exhibit fossorial behavior.^[2]