Centrolene is a genus

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

 of glass frog

Glass frog

Glass frog is the common name for the frogs of the amphibian family Centrolenidae . While the general background coloration of most glass frogs is primarily lime green, the abdominal skin of some members of this family is transparent...

s in the family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Centrolenidae. The adult males are characterized by having a humeral spine

Humeral spine

Humeral spines are ventrolateral extensions of the humeral crista ventralis. This structures are present in the humerus of some frogs . The majority of anuran species that present humeral spines are glassfrogs but humeral spines have been reported in various other species of different families of...

, as most members of this family. The delimitation of this genus versus Cochranella

Cochranella

Cochranella is a genus of glass frogs, characterized by lacking humeral spines in males, and having a lobed liver. About one-third of the species formerly placed in Cochranella were placed into the genus Nymphargus....

is not fully resolved, and some species

Species

In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 formerly in Centrolenella - which is nowadays synonymized with Centrolene - are now in Hyalinobatrachium

Hyalinobatrachium

Hyalinobatrachium is a genus of glassfrogs characterized by having a bulbous liver covered by white pigment, a transparent parietal peritoneum, extensive membrane between the outer fingers, and lacking a humeral spine in adult males....

.

Some species are called "giant glass frogs". But this is merely relative to the rest of their family, which contains numerous extremely diminutive species.

Species

Though this list is reasonably complete, new species are described on a continuous basis and may be missing.