Hypsolebias stellatus, (Costa & Brasil 1994)

History

This species was originally described as Cynolebias stellatus.

The genus Cynolebias was divided into Cynolebias, Megalebias and Simpsonichthys by Costa, in  2001.

W. Costa (2006) assigned many members of the genus Simpsonichthys to the subgenus Hypsolebias (Costa 2006). Hypsolebias was subsequently elevated to a genus (Costa 2011). According to some scientists, the separation of Hypsolebias from the genus Simpsonichthys is insufficiently substantiated and, therefore, debatable.

Discoverer(s): Wilson J.E.M. Costa, Gilberto Campello Brasil and C. Campinha, February 7. 1994.

Type locality: 1 km north of São Francisco, Minas Gerais state, Brasil.

Etymology: with stars (from Latin: stella), in reference to the male color pattern of upper sides, Caudal and Dorsal fins, with blue-green dots.

Superspecies-components: 

H. auratus, gibberatus, nielseni, notatus, radiosus, rufus, similis, stellatus, trilineatus, virgulatus.

Diagnosis: 

separated from notatus by its deeper body shape, by the broad black margin in anal fin of male and by the

 

 

 
Hypsolebias stellatus - male. © Image made by F. Vermeulen.
Hypsolebias stellatus - female. © Image made by F. Vermeulen.
 

vertical bars on female ; no black blotch on male mid-anterior sides ; dark gray to black margin on anal fin in male ; bright blue spots alternating with black interspace on dorsal fin base in male ; caudal fin brownish red in male (Costa & Brasil, 1994, 2004) ; differs from nielseni in having caudal fin dark brownish red in male (vs. greenish yellow) and by the presence of a dark gray to black distal stripe on the anal fin in male (vs. absence).


Reproduction

This species can be productive, and the fry is small. Immediately after hatching, the fry should be fed with freshly hatched Artemia nauplii (brine shrimp) or better Paramecium. As most annual species do, they spawn by diving entirely into the substrate. It is best to provide a container with a lid on top in which a hole is made to allow the fish access. That container will need to have enough peat in it for the fish to dive completely into it. For most Hypsolebias species, egg development is complete after 8-10 weeks. However, it is wise also to check a few weeks earlier to see if any eggs have fully developed. Do not let the peat dry too far because the Hypsolebias like it moist. The development will be slower at storage temperatures between 21 and 24 Celsius and speed up at 25-29 Celsius. Before watering the eggs, put some eggs in the water of about 18-20 degrees Celsius to see if the eggs hatch correctly. That usually happens within 2-6 hours. Then, if eggs hatched well and fry, swim correctly, bring all remaining peat in the water. You may need to re-pack the peat after pouring over the first group of fry to a larger tank.

 

With regular water changes and sufficient food, the young will grow quickly, and after about 5-6 weeks, they can already produce their first eggs. Since this genus has an annual life cycle, the expected life span in captivity is not much more than 10 to 12 months. Their life expectancy is limited to when their pool still has water in the wild. This period can vary from 6 to 8 months.

Remark:

It is unfortunate that many species that were described never reached the fanciers. This is because newly discovered species are placed in alcohol shortly after their discovery and description. Since Brazilian regulations prohibit the keeping and distribution of these species within their own country and beyond, it is impossible to take photos of these species, and only photos from the original description can be taken.

Look for detailed info on this species at: https://www.killi-data.org/ Membership is free!


Variations
Hypsolebias stellatus - male. © Image made and donated by Francisco Falcon, Brasil.
 
 
Hypsolebias stellatus - male. Rio Sao Francisco, Collected february 2009. © Image made and donated by Francisco Falcon, Brasil.
 

Map
     

Meristics

Max. size 5.5 cm.
Dorsal 21.3,
Anal 20.3,
D/A 0.1,
LL scale count (average)27.0
Pre- dorsal length to % SL – 47.1 %
Depth to % SL – 34.7 %

   

Literature
Costa, W.J.E.M. & G.C. Brasil. 1994. Trois nouveaux Poissons annuells du Genre Cynolebias (Cyprinodontiformes: Rivulidae) du bassin du Rio Sao Francisco, Bresil. Rev. fr. Aquariol. Herpetol., 21 (1-2): 8, fig.5.