| Family: |
Rivulidae (Rivulines), subfamily: Rivulinae |
| Max. size: |
3.8 cm SL (male/unsexed) |
| Environment: |
benthopelagic; freshwater; pH range: 6 - 6.4 |
| Distribution: |
South America: river drainages connected to the Maricá lagoon system in Rio de Janeiro state, Brazil. |
| Diagnosis: |
Dorsal soft rays (total): 7-9; Anal soft rays: 14-16; Vertebrae: 33-34. Atlantirivulus maricensis can be diagnosed from all other species of the genus Atlantirivulus by the following combination of characters: lateral line divided into two sections (vs. single); lateral line with one neuromast by scale (vs. lateral line often interrupted by scales without neuromasts); scales in the longitudinal series 33-35 (vs. 30-31); vertebrae 33-24 (vs. 31-32); caudal fin with 30-31 rays (vs. 25 - 29); small, horizontally elongated black spot on dorsal portion of caudal-fin base in females, not contacting fin margin (vs. female caudal spot never horizontally elongated, often triangular or rectangular, reaching fin margin, sometimes spot absent); flank with horizontal rows of red dots in males and small light brown spots in females (vs. never a similar color pattern, red pigmentation when present often forming irregular bars or reticulations in males); caudal fin in males greenish yellow, sub-dorsal and sub-ventral portions bright yellow, dorsal and marginal region diffuse orangish grey, posterior marginal portion diffuse pale greyish yellow (vs. never a similar color pattern); small red spots on the basal and posterior portions of the dorsal fin in males (vs. red spots absent). |
| Biology: |
Found in creek under a forest remnant and in small shallow stream, partially protected by a secondary forest remnant (Ref. 102354). |
| IUCN Red List Status: |
Critically Endangered (CR); Date assessed: 07 November 2018 (B2ab(iii)) Ref. (130435)
|
| Threat to humans: |
harmless |
Source and more info: www.fishbase.org. For personal, classroom, and other internal use only. Not for publication.