Results for “divergence”
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Anatolichthys villwockiSakarya Toothcarp
Hrbek & Wildekamp, 2003
Max length60mm SL2.4in SLTank120 × 30cm48 × 12inTemp2–30°C36–86°FpH6.5–8.5Prior to its description this species had been considered a form of A. anatoliae and also referred to as A. sp. aff. danfordii but collections in the early part of this century motivated new studies and resulted in its elevation to full species level. Phylogenetic analyses have shown it to represent the sister group to all other Anatolian Aphanius spp. The Anatolia region represents a centre of diversity for the genus with ten endemic species described to date. These are thought to have diverged ...
Apricaphanius saourensisSahara Toothcarp
Blanco, Hrbek & Doadrio, 2006
Max length45mm SL1.8in SLTank120 × 30cm48 × 12inTemp2–30°C36–86°FpH7.5–9.0All Algerian Aphanius populations were considered to be representative of A. iberus until this species was described in 2006. It differs both morphologically and genetically from A. iberusand A. baeticus, probably diverging about 5.3 million years ago during the opening of the Straits of Gibraltar. It is most easily distinguished by the distinct mottled body patterning which in males of the other two species forms distinct vertical bars and in females dark spot-like markings. A. iberusis now k...
Astyanax mexicanusBlind Cave Tetra
De Filippi, 1853
Max length95mm SL3.7in SLTank80 × 30cm31 × 12inTemp20–25°C68–77°FpH6.5–8.0While the surface-dwelling form of this species is fairly unremarkable and rarely-seen in the hobby, the blind form is very popular indeed. The two may have diverged as recently as within the last 10,000 years, with the blind form losing its eyes and much of its pigment. This probably happened because the fish needed better development in other sensory areas. Losing unnecessary and energy-consuming aspects of its physiology allowed it to devote more energy to developments such as increased numbers of taste receptors on the head.
Erethistes maesotensis
authority not recorded
Max length40mm SL1.6in SLTank45 × 30cm18 × 12inTemp20–24°C68–75°FpH6.0–7.0This species is now considered a member of the Hara genus by many experts, but as things stand it is still officially included in Erethistes. It is, in all likelihood, a Hara, as Erethistes is characterised by divergent denticles on the pectoral fins, whereas Hara possess outwardly pointing denticles. E. maesotensis has these outwardly pointing denticles. It's quite rare in the trade, but makes an interesting addition to an Asian stream community tank if you can get hold of some....