Kryptolebias marmoratus
(Poey 1880)
Family Cynolebiidae

Lateral view of a mangrove rivulus
The mangrove rivulus pictured above was collected in Brevard County, Florida in 2016. It is now part of the Florida Museum ichthyology collection, UF 238206. Florida Museum photo by Zachary Randall

The mangrove rivulus is a member of the family of New World rivulines. The mangrove rivulus has an ocellus comprising a cream-colored ring, and a black center is present at the upper caudal fin base – except in males. This species has tubular nostrils and no lateral line. The single dorsal fin is placed far back on the body, above the last few rays of the anal fin. The mangrove rivulus is a marine species that occasionally inhabits freshwater ditches and canals, and is usually found on mud in mangrove swamps and other brackish-water environments.

Status & distribution

  • Status — Marine invader
  • Florida Distribution — Gulf Coast; South Florida; Atlantic Coast
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