Flap over fishes: Who's the smallest of them all? La femmina depone da 4 a 20 uova, fecondate esternamente dal maschio che però è dotato di minuscoli ganci controllati da potenti muscoli, atti ad agganciarlo al corpo della femmina e permettere la fecondazione sicura delle uova. Questa specie è diffusa in Indonesia, nell'isola di Sumatra, dove abita paludi con acque molto acide (pH 3) e scure. Froese, Rainer and Pauly, Daniel, eds. "The "Celestial pearl danio", a new genus and species of colourful minute cyprinid fish from Myanmar (Pisces: Cypriniformes)", "Evolution of miniaturization and the phylogenetic position of, "Ecological guild evolution and the discovery of the world's smallest vertebrate". The largest known individual is 10.3 mm (0.41 in).  In Malaysia alone, it has been estimated that—in addition to Paedocypris—up to 15% of the freshwater fish species are associated with peat swamps, and based on current destruction rates all Bornean and Sumatran peatlands may be gone by 2040. , Kottelat, Britz, H. H. Tan & K. E. Witte, 2006. , The three currently recognized species in this genus are:.  Sundadanio and Paedocypris were found to share a sister group relationship, supporting its close relationship to danionin genera; however, this study included danionins among the subfamily Rasborinae.. Two species were discovered and identified by ichthyologists Maurice Kottelat from Switzerland and Tan Heok Hui from the Raffles Museum of Biodiversity Research and the National University of Singapore in 1996. Their miniature transparent bodies lack the typical features characteristic of adult fish, for instance a bony skull structure around its brain, and it retains the postanal larval fin-fold along the ventral edge of the caudal peduncle, characteristic of fish larvae. La livrea presenta un corpo trasparente (con varie sfumature dall'azzurro al rosso sangue) che lascia vedere perfettamente gli organi interni. Paedocypris is a genus of tiny cyprinid fish found in swamps and streams on the Southeast Asian islands of Borneo, Sumatra and Bintan.  Members of this genus are habitat specialists that only live in acidic water.  P. carbunculus is found in peat swamps in Central Kalimantan, Borneo, Indonesia. The genus, Paedocyrpis, and two species, Paedocypris progenetica and Paedocypris micromegethes, were first described in 2006. Mature females measure just 7.9 millimeters — less than one third of an inch!  It has been speculated that some other miniature fish from the habitat and region may already have become extinct, even before being scientifically described or discovered. Progenetica (from the word progenetic) is used as an adjective. The smallest mature female measured 7.9 mm (0.31 in) and the largest known individual was 10.3 mm (0.41 in). Kottelat, Britz, H. H. Tan & K. E. Witte, 2006. P. progenetica presenta un corpo snello e allungato, con la particolare conformazione della testa che, protesa in avanti, non protegge il cervello con una scatola cranica completa. These modified fins are thought to be used to grasp the female during mating, or to keep position over a spawning surface. Paedocypris progenetica has been claimed to be the smallest known species of fish and vertebrate in the world, particularly before the description of the frog Paedophryne amauensis in 2012.  They have a unique sexual dimorphism: The males have highly modified pelvic fins, with the first ray terminating with a hook-like projection of keratinized skin, supported by hypertrophied pelvic musculature. Paedocypris progenetica è un piccolo pesce d'acqua dolce appartenente alla famiglia Cyprinidae. In 1994, the same ichthyologists had already discovered in Sarawak (Malaysian part of Borneo) another miniature species of the same genus Paedocypris. (Part II). They have a unique sexual dimorphism: The males have highly modified pelvic fins, with the first ray terminating with a hook-like projection of keratinized skin, supported by hypertrophied pelvic musculature. RMBR: So which is the smallest species of fish in the world? Their miniature transparent bodies lack the typical features characteristic of adult fish, for instance a bony skull structure around its brain, and it retains the postanal larval fin-fold along the ventral edge of the caudal peduncle, characteristic of fish larvae. Females of this species, a relative of gobies, which is only known from the Great Barrier Reef, reach sexual maturity by 7 mm to 8 mm in length and males mature by 6.5 mm to 7 mm. The world’s smallest fish is Paedocypris progenetica, and was only recently discovered in the last decade. Males also have a pad of keratinized skin in front of the pelvic fins. Le pinne sono allungate e trasparenti. BBC: Is it really the smallest fish after all?  P. micromegethes lives in the peat swamps of Sarawak in northern Borneo, Malaysia. Micromegethes is Greek for small in size, and is used as a noun in apposition. Paedocypris progenetica. However, these survive only by sexual parasitism, and the female individuals reach the significantly larger size of 50.5 mm (1.99 in). Paedocypris progenetica, a distant cousin of the carp, is thin, transparent, and the size of a large mosquito when fully grown. Like P. progenetica, P. micromegethes was found in the slow-flowing blackwater streams and peat swamps. Le dimensioni estremamente minute (i maschi raggiungono i 10 mm di lunghezza e le femmine 7,9 mm) permettono a questo pesce di essere considerato il più piccolo pesce osseo e anche tra i vertebrati più piccoli esistenti in natura (primato strappato nel 2008 dalle rane Paedophryne amauensis e Paedophryne swiftorum).
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