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Coming soon

Among its congeners, the new species shares exclusively with Knodus figueiredoi the presence of only uni-tricuspid teeth in the premaxilla, maxilla and dentary. Knodus borari differs from Knodus figueiredoi by the color pattern and morphological characteristics. soon

As suggested by their former taxonomic name, a gland on their caudal fin is found almost exclusively in the males of many species of this family, which allows the release and pumping of pheromones. Members of this subfamily have complex courtship behaviors which lead to insemination. The ecology and life history of these fish is complex yet little studied. Stevardiid fish are important components of the diet for commercially-harvested larger fish.

Modified scales may act as bellows in releasing chemicals into the water. A caudal fin ray pheromone pump, unique to subfamily Glandulocaudinae, consists of glandular tissue associated with modified scales and fin rays. The tribe Diapomini is the only tribe in which the caudal gland is equally developed in both the males and females.

Females of all stevardiid species are inseminated. The females produce fewer eggs per unit body weight than externally fertilizing species; this is possibly because insemination increases the efficiency of fertilization, so fewer eggs are necessary. This insemination is preceded by courtship in all species. After insemination, the female may retain the live sperm for many months in her ovaries. This allows the eggs to be laid when environmental conditions are favorable. However, there is no evidence of an intromittent organ, and the exact mechanism of insemination is unknown. Hooks on the anal fin of males may play a role, although these are also found in characins that exhibit external fertilization. It was originally believed that internal fertilization occurs in stevardiids. However, the exact time of fertilization is unknown and no fertilized eggs are found internally; this suggests fertilization occurs when the eggs are being laid or even outside of the body.

Coming soon

Coming soon

Passive and shy.

The new species is the fifth species of the genus described from the Rio Tapajós basin, and the second restricted to the lower portion of the basin. This is additional evidence that the lower Rio Tapajós basin is a region of ichthyofaunal endemism.

• Movement Pattern: Not a Migrant

• Individual Type: Solo

• Population Trend: Stable

• Population: ugh

• Locomotion: Aquatic

• Habitat: Warm River; Cold River; Lukewarm River; Warm Pond; Cold Pond; Warm Lake; Cold Lake.

• Earth: 

  • Extant: Brazil (Rio Tapajós Basin)

• Berbania/Hirawhassa: none

• Reinachos/Ityosel: none

• Thatrollwa: none

• Sawintir: none

• Agarathos: none

Coming soon

Coming soon

Past and Present Incidents - Individuals

• Terran/Gaian

  • n/a

• Berbanian/Hirawhassan

  • n/a

• Reinachos/Ityoselese

  • n/a

• Delphian/Thatrollwan

  • n/a

• Sawintiran

  • n/a 

• Jotunheim

  • n/a

The Recollections of Queen Arianna - Individuals

• Terran/Gaian

  • n/a

• Berbanian/Hirawhassan

  • n/a

• Reinachos/Ityoselese

  • n/a

• Delphian/Thatrollwan

  • n/a

• Sawintiran

  • n/a

• Jotunheim

  • n/a

• Coming soon

Coming soon

• Coming soon

• https://novataxa.blogspot.com/2023/07/knodus.html?m=1

• https://onlinelibrary.wiley.com/doi/abs/10.1111/jfb.15422

• https://www.deviantart.com/ognimdo2002/art/Knodus-borari-965406140