Rivulus henschelae, Costa, Bragança & Amorim 2013

History

Alternative name: Anablepsoides henschelae.

Distinguished from all other species of the
A. ornatus group by having the caudal fin in males with similar colouration on its dorsal and ventral portions (vs. always distinct colouration) and the presence of a longitudinal row of dark red dots on the ventral portion of the flank in males (vs. longitudinal row of dark red dots absent).
Description. Morphometric data appear in Table 3. Dorsal profile slightly convex from snout to end of caudalfin base. Ventral profile approximately straight, slightly convex on pelvic-fin region. Body slender, depressed on head, gradually becoming compressed posteriorly. Greatest body depth at vertical through pelvic-fin base.
Jaws short, snout slightly pointed in lateral view. Dorsal and anal fins small, extremity rounded, dorsal sub-rectangular, anal fin sub-triangular. Caudal fin oval, slender and long. Pectoral fin rounded, posterior margin reaching vertical through pelvic-fin base in male, through urogenital papilla in females.

 
Rivulus (Anablepsoides) henschelae - male. Image taken from the original description.

Pelvic fin elliptical, extremity reaching anal-fin origin in males, reaching urogenital papilla in females. Pelvic-fin bases medially in close proximity. Dorsal-fin base posterior to anal-fin base; second proximal radial of dorsal fin between neural spines of 19th and 21st vertebrae, first proximal radial of anal fin between pleural ribs of 13th and 15th vertebrae. Dorsal-fin rays 6; anal-fin rays 9 – 11; caudal-fin rays 23 – 26; pectoral-fin rays 12 – 13; pelvic fin rays 7.


Reproduction

No records are available for breeding this species but will not differ from how any other small Rivulus from the Anablepsoides species group reproduce. They are seen as very difficult breeders as they need special attention from the one who keeps the species. In general, keep the water level very low at a max of 10 cm and provide shelter using a thick layer of floating plants and leaves at the bottom. If fed well with small live food like Artemia and mosquito larvae, then collect the fry from the surface or leave them with the parents to grow up.

 

 

Best to provide them with brownish, soft, and acid water with pH as low as 4,5 to 5,5 pH. Most likely, eggs are produced only in low numbers because they are relatively big (2 mm) for such small fishes.

Remarks :

First of all, live animals are needed for further study on the reproduction and the behavior of this new species.


Variations
     

Map
     

Meristics

   

Literature
Costa, W. J. E. M., P. H. N. Bragança & P. F. Amorim, 2013. Five new species of the killifish genus Anablepsoides from the Brazilian Amazon (Cyprinodontiformes: Rivulidae)63 (3): 283 – 293   Reappraisal of the Phylogeny of Rivulus and its Allied focused on External Characters. Huber, J.H.: Killi-Data Series 2012, 9-25.