Laubuka tenella, a Shimmering New Danio Species

22 Mar, 2018

Laubuka tenella, paratype from the type locality, photographed alive immediately upon capture.

Laubuka tenella, paratype from the type locality, photographed alive immediately upon capture, displaying a neon blue-green stripe and faint blue vertical bars.

A sleek, small, and glimmeringly-hued new species in the danio clan has just been described and may offer potential for breeders serving the aquarium trade. Reaching a maximum size of just 6 cm (2.36 inches), the shimmering Laubuka tenella represents the newest addition to the ever-popular Danioninae subfamily. Discovered in the Cox’s Bazar District of southeastern coastal Bangladesh, it has also been reported further to the south in the Thandwe River drainage in neighboring western Myanmar.

Domdomia stream, the type locality of Laubuka tenella, May 9th, 2015.

Domdomia stream, the type locality of Laubuka tenella, May 9th, 2015.

The open-access ZooKeys paper, Laubuka tenella, a new species of cyprinid fish from southeastern Bangladesh and southwestern Myanmar (Teleostei, Cyprinidae, Danioninae), by authors Sven Kullander, Md. Mizanur Rahman, Michael Norén, and Abdur Rob Mollah, provides a great deal of insight into the genus Laubuka, clarifying earlier work. The paper’s authors note that Laubuka spp. are similar in many respects to the more familiar Devario genus, but Laubuka lack barbels and tend to have more muted, indistinct markings, when compared to Devario.

The “tenella” name etymology is stated by the authors this way: “The specific name is a Latin adjective in diminutive form, tenellus, here in the meaning of delicate, referring to the small size and the soft, delicate consistency of fresh specimens.”

Map of collecting sites of Laubuka laubuca and the newly described L. tenella. (Map: Kullander et al using Natural Earth Data.)

Readers willing to dive into the species description will be rewarded with insights into the habitat of the new species; thorough descriptions of the stream composition could be quite useful in recreating the biotope of this species. The authors further provide detailed accountings of species found in situ with Laubuka tenella at each location surveyed. Depending on the specific location, one might find a range of aquarium-suitable danios, Devario species, rasboras, and assorted barbs, along with the Burmese Loach (Lepidocephalichthys berdmorei) and at times multiple gobies, owing to the coastal proximity of this species’ habitat.

Humanely euthanized with MS 222 and preserved specimens of Laubuka tenella. A: holotype, DU 9004, 42.1 mm SL. Bangladesh: Chittagong Division: Domdomia stream, 10 km north of Teknaf. B: Laubuka tenella, paratype, NRM 40813, 39.8 mm SL. Myanmar: Rakhine State: Thandwe River drainage, Nan Chaung, near Thandwe. C: Laubuka tenella, paratype, NRM 67380, 46.8 mm SL, preserved in 95% ethanol. Bangladesh: Chittagong Division, Majerchora stream, 10 km south of Cox’s Bazar.

You can read the paper online at https://zookeys.pensoft.net/articles.php?id=22510

Abstract

Laubuka tenella is a new species characterized by the colour pattern, consisting of short dark vertical bars anteriorly on the side, and a dark lateral band posteriorly on the side, combined with a relatively short pelvic fin and 29–30 lateral-line scales. It is separated from other Laubuka analysed by minimum 9% uncorrected p-distance in the mitochondrial COI gene. The type series is composed of specimens from small streams in the Cox’s Bazar District in Bangladesh (the type locality), and the Thandwe River drainage in western Myanmar. Laubuka brahmaputraensis is strongly indicated to be a junior synonym of L. laubuca, the second known species of Laubuka in Bangladesh. Eustira ceylonensis, currently in the synonymy of Devariomalabaricus, is a valid species of Laubuka.

Sources

Natural Earth Data: http://www.naturalearthdata.com/

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About the author

Matt Pedersen
Matt Pedersen

Matt Pedersen is a Sr. Editor and Associate Publisher with Reef To Rainforest Media, LLC, including AMAZONAS & CORAL Magazines. Matt has kept aquariums for 36 years, has worked in most facets of the aquarium trade, is an active aquarist and fish breeder (both marine and freshwater), and was recognized with the 2009 MASNA Award as the MASNA Aquarist of the Year.

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