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Rhamphichthys heleios Carvalho & Albert, 2015 Marsh knifefish |
| Family: | Rhamphichthyidae (Sand knifefishes) | |||
| Max. size: | 40 cm SL (male/unsexed) | |||
| Environment: | demersal; freshwater | |||
| Distribution: | South America: Solimões and Amazon rivers in Brazil upstream of the mouth of the Madeira River; also from a single locality in the Guaporé River in Brazil. | |||
| Diagnosis: | Description: anal-fin rays 320-345 (Ref. 99943). | |||
| Biology: | Occurs mostly in floodplains of large rivers, where it is frequently collected together with Rhamphichthys drepanium and R. marmoratus. | |||
| IUCN Red List Status: | Least Concern (LC); Date assessed: 28 December 2020 Ref. (130435) | |||
| Threat to humans: | harmless | |||