Costa (2001) considered C. porosus and C. albipunctatus as distinct species, the former known only from the holotype collected in “Pernambuco”, and the latter endemic to the São Francisco basin. Cynolebias albipunctatus was mainly distinguished from C. porosus by the former lacking scales on the anal fin, whereas the only known specimen of the latter has scales extending slightly over the middle of the anal-fin base. Material recently collected near Santa Maria da Boa Vista, Pernambuco, revealed that both morphological conditions are present in this population, besides agreeing well with the other characters described by Steindachner. Costa (2001) suspected that the type specimen was collected near the coastal city of Recife, but after some decades studying Cynolebias, species of this group have been broadly recorded only for the savannahs distant from the coast, never in the coastal Atlantic forest area. However, although that part of the Caatinga was poorly known to naturalists at the time of Steindachner’s description, studies indicate that a seasonal fish of the genus Cynolebias from the São Francisco river basin in Pernambuco state was already known among local naturalists during the second half of the 19th century, who frequently were in contact and sent study material to European naturalists (e. g. Rosado & Silva, 2001). Consequently, C. porosus is considered endemic to the São Francisco river basin in Pernambuco state and an adjacent part of Bahia state, whereas C. albipunctatus is herein placed in the synonymy of C. porosus.

Other species in its species group are C. altus, C. attenuatus, C. gibbus, C. gilbertoi, C. macrophthalmus, C. parietalis, C. obscurus, C. oticus, C. ochraceus, C. perforatus, C. roceus, C. rectiventer and C. vazabarrisensis.

No data available but assumed not different from its congeners. Breeding Cynolebias porosus is not for inexperienced hobbyists. The species becomes relative large and need special attention in feeding and storing the eggs. Food demand is high as the species need to grow to adulthood within a few months and eggs need to be stored under very cool circumstances in wich a frigidaire could become a good tool.
Reproduction is best with one male and a number of big females. Tank need at least contain 60 liters and provide shelter for the females as male can be very agressive.

Also females are known to be agressive to each other. Put a high container filled with neutral pH material like Coco peat or clay (or a mix of it) for spawning.

Eggs are 2.2 mm in diameter and need about 4 to 5 months to develop. Juveniles that grow faster than others should be separated from the smaller ones immediately as they prey on them.

Remarks :

As with almost all other species this one is seldom available under hobbyists.

Max. size 15.0 cm in males - fem.smaller.
Dorsal (average, male only ) 18.0,
Anal (average, male only ) 20.1,
D/A (average, male only ) 4.0,
LL scale count (average) 40.1

Steindachner F. 1876. Ichthyologische Beitrage (V) Sitz. Akad. Wiss. Wien mathem.-naturwiss. Klasse Abt. 1, 74: 173, pl. 10 (fig.3)

Costa, W.J.E.M. 2014. Six new species of seasonal killifishes of the genus Cynolebias from the Sao Francisco river basin, Brazilian Caatinga with notes on C. porosus. (Cyprinodontiformes, Rivulidae) Ichthyol. Expl. Freshwaters, Vol. 25, Nr. 1, pp. 79-96, 7 figs., 3 tabs., August 2014.