''Nomorhamphus'' is a southeast Asian genus of

viviparous halfbeak Zenarchopteridae, the viviparous halfbeaks, is a family in the order Beloniformes. The Zenarchopteridae exhibit strong sexual dimorphism, practicing internal fertilisation, and in some cases ovoviviparous or viviparous (the family also includes ...

s from streams, rivers and lakes in

Sulawesi Sulawesi (), also known as Celebes (), is an island in Indonesia. One of the four Greater Sunda Islands, and the world's eleventh-largest island, it is situated east of Borneo, west of the Maluku Islands, and south of Mindanao and the Sulu Ar ...

(

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guine ...

) and the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

. They are all

viviparous Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the m ...

, producing small clutches of around a dozen fry about 10 to 15 mm long at birth. Females are generally larger than the males. In the largest species, such as ''Nomorhamphus liemi'', the females typically reach about in length, whereas the males reach about in length. Males are also more brightly coloured than the females (often having red, black, or blue patches on their fins). Compared with many other halfbeaks, the lower

mandible In anatomy, the mandible, lower jaw or jawbone is the largest, strongest and lowest bone in the human facial skeleton. It forms the lower jaw and holds the lower tooth, teeth in place. The mandible sits beneath the maxilla. It is the only movabl ...

, or beak, is relatively short, on females in particular barely protruding beyond the length of the upper mandible. The males of some species (e.g., '' N. ebrardtii'') have short, straight beaks, but those of others (e.g., '' N. liemi'') have short beaks that curve downwards forming a shape often compared to a

goatee A goatee is a style of facial hair incorporating hair on one's chin but not the cheeks. The exact nature of the style has varied according to time and culture. Description Until the late 20th century, the term ''goatee'' was used to refer solel ...

beard by

aquarist An aquarist is a person who manages aquariums, either professionally or as a hobby. They typically care for aquatic animals, including fish and marine invertebrates. Some may care for aquatic mammals. Aquarists often work at public aquariums. They ...

s. '' N. aenigma'' is unique within ''Nomorhamphus'' because of its lack of lower jaw elongation. ''Nomorhamphus'' feed extensively on small

insect Insects (from Latin ') are pancrustacean hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body ( head, thorax and abdomen), three pairs ...

s, either in the form of aquatic

larva A larva (; plural larvae ) is a distinct juvenile form many animals undergo before metamorphosis into adults. Animals with indirect development such as insects, amphibians, or cnidarians typically have a larval phase of their life cycle. The ...

e or as flying insects that have fallen onto the surface of the water. They are important predators on insects such as mosquitoes, so play a role in controlling

malaria Malaria is a mosquito-borne infectious disease that affects humans and other animals. Malaria causes symptoms that typically include fever, tiredness, vomiting, and headaches. In severe cases, it can cause jaundice, seizures, coma, or death. S ...

. ''Nomorhamphus'' are too small to be of value as food, but they do have some value as aquarium fish.

Reproduction

Nomorhamphus liemi liemi (Wroclaw zoo)-2

''Nomorhamphus'' species are livebearing fish that practise internal fertilisation. The male is equipped with a gonopodium-like anal fin known as a gonopodium that delivers sperm into the female. The

gestation Gestation is the period of development during the carrying of an embryo, and later fetus, inside viviparous animals (the embryo develops within the parent). It is typical for mammals, but also occurs for some non-mammals. Mammals during pregna ...

period is about six weeks. The exact mode of reproduction ranges from

ovoviviparity Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction. Ovoviviparous animals possess embryos that develop insi ...

through to

viviparity Among animals, viviparity is development of the embryo inside the body of the parent. This is opposed to oviparity which is a reproductive mode in which females lay developing eggs that complete their development and hatch externally from the m ...

, and in some species,

oophagy Oophagy ( ) sometimes ovophagy, literally "egg eating", is the practice of embryos feeding on eggs produced by the ovary while still inside the mother's uterus. The word oophagy is formed from the classical Greek (, "egg") and classical Greek (, ...

is known, as well. Only around ten to twenty embryos are developed at a time, but at birth these are fairly large (around ) and well developed, able to take small prey, such as '' Daphnia'', immediately after birth.

Species

There are currently 20 recognized species in this genus: * ''

Nomorhamphus aenigma ''Nomorhamphus'' is a southeast Asian genus of viviparous halfbeaks from streams, rivers and lakes in Sulawesi (Indonesia) and the Philippines. They are all viviparous, producing small clutches of around a dozen fry about 10 to 15 mm long at ...

Kobayashi Kobayashi (written: lit. "small forest") is the 8th most common Japanese surname. A less common variant is . Notable people with the surname include: Art figures Film, television, theater and music *, Japanese actress and voice actress *, ...

, Masengi & Yamahira, 2020 *''

Nomorhamphus bakeri ''Nomorhamphus'' is a southeast Asian genus of viviparous halfbeaks from streams, rivers and lakes in Sulawesi (Indonesia) and the Philippines. They are all viviparous, producing small clutches of around a dozen fry about 10 to 15 mm long at ...

'' Fowler & B. A. Bean, 1922 * ''

Nomorhamphus brembachi ''Nomorhamphus'' is a southeast Asian genus of viviparous halfbeaks from streams, rivers and lakes in Sulawesi (Indonesia) and the Philippines. They are all viviparous, producing small clutches of around a dozen fry about 10 to 15 mm long at ...

'' D. Vogt, 1978 * ''

Nomorhamphus celebensis The Poso halfbeak (''Nomorhamphus celebensis'') is a species of viviparous halfbeak endemic to Lake Poso and its tributaries in Sulawesi, Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceani ...

'' M. C. W. Weber & de Beaufort, 1922 (Poso halfbeak) * ''

Nomorhamphus ebrardtii ''Nomorhamphus ebrardtii'' is a species of viviparous halfbeak, a ray-finned fish in the family Zenarchopteridae, endemic to brackish and freshwater locations in Sulawesi and the neighbouring island of Kabaena in Indonesia. This species can reac ...

'' Popta, 1912 * ''

Nomorhamphus hageni ''Nomorhamphus'' is a southeast Asian genus of viviparous halfbeaks from streams, rivers and lakes in Sulawesi (Indonesia) and the Philippines. They are all viviparous, producing small clutches of around a dozen fry about 10 to 15 mm long at ...

'' Popta, 1912 * '' Nomorhamphus kolonodalensis'' A. D. Meisner &

Louie Louie may refer to: Arts and entertainment * ''Louie'' (American TV series), by comedian Louis C.K. * ''Louie'' (French TV series), animated series about a young rabbit who draws pictures which come to life * "Louie" (song), by Blood Raw * ''L ...

, 2000 * '' Nomorhamphus lanceolatus'' Huylebrouck, Hadiaty &

Herder A herder is a pastoral worker responsible for the care and management of a herd or flock of domestic animals, usually on open pasture. It is particularly associated with nomadic or transhumant management of stock, or with common land grazing. ...

, 2014 Huylebrouck, J., Hadiaty, R.K. & Herder, F. (2014): Two new species of viviparous halfbeaks (Atherinomorpha: Beloniformes: Zenarchopteridae) endemic to Sulawesi Tenggara, Indonesia. ''Raffles Bulletin of Zoology, 62: 200–209''. * ''

Nomorhamphus liemi ''Nomorhamphus'' is a southeast Asian genus of viviparous halfbeaks from streams, rivers and lakes in Sulawesi (Indonesia) and the Philippines. They are all viviparous, producing small clutches of around a dozen fry about 10 to 15 mm long at ...

'' D. Vogt, 1978 * '' Nomorhamphus manifesta'' A. D. Meisner, 2001 * ''

Nomorhamphus megarrhamphus ''Nomorhamphus megarrhamphus'' is a species of viviparous halfbeak, a freshwater fish endemic to Lake Towuti in Sulawesi, Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the I ...

'' Brembach, 1982 * '' Nomorhamphus pectoralis'' Fowler, 1934 * '' Nomorhamphus philippina'' Ladiges, 1972 * '' Nomorhamphus pinnimaculata'' A. D. Meisner, 2001 * '' Nomorhamphus rex'' Huylebrouck, Hadiaty &

, 2012 Huylebrouck, J., Hadiaty, R.K. & Herder, F. (2012): Nomorhamphus rex, a new species of viviparous halfbeak (Atherinomorpha: Beloniformes: Zenarchopteridae) endemic to Sulawesi Selatan, Indonesia. ''The Raffles Bulletin of Zoology, 60 (2): 477-485.'' * '' Nomorhamphus rossi'' A. D. Meisner, 2001 * '' Nomorhamphus sagittarius'' Huylebrouck, Hadiaty &

, 2014 * '' Nomorhamphus towoetii'' Ladiges, 1972 * '' Nomorhamphus vivipara'' W. K. H. Peters, 1865 * '' Nomorhamphus weberi''

Boulenger Boulenger is a surname. Notable people with the surname include: * Benjamin Boulenger (born 1990), French footballer * Edward George Boulenger (1888–1946), British zoologist, director of aquarium at London Zoo * George Albert Boulenger (1858–1 ...

, 1897

Reproduction

Species

References

Further reading