You are viewing this Genus as classified by:

IUCN threat status:

Not evaluated

Comprehensive Description

Read full entry

Description: Body relatively thin, typically long and narrow with a large eye and a terminal small mouth (some individuals are more wide-bodied and leaf-shaped and are presumably approaching transition). Pectoral fins short and pelvic fins stubs in pre-transitional larvae. Dorsal and anal-fin bases relatively long, caudal peduncle short and relatively wide. Lightly marked; an irregular row of up to 12 melanophores along or beneath the base of the anal fin extending into the caudal peduncle. There is marked variability in the line-up of this row of melanophores. The typical pattern for the first seven melanophores is the first three after the vent are deep in the body and not along the base of the anal-fin rays and the next four are located at the base of the fin rays and can be expanded and appear larger than the rest (i.e. 3+4, sometimes 4+3). The next in the row is usually well above the fin base and the then last four are in a row starting near the base of the last anal-fin ray slanting up into the caudal peduncle musculature. Many individuals are missing some of the row of melanophores, some show as few as five. There is a variable row (from none to 10, occasionally 20 or more) of tiny melanophores along the dorsal midline of the caudal peduncle (often can be slightly offset and variably paired), starting just behind the base of the last dorsal-fin ray. Melanophores occur internally around the gut near the vent and often there is an additional melanophore around the gut well above the vent along the posterior peritoneum. Series of transitional larvae show development of the eye from a narrowed vertical oval, usually tilted forward with a sometimes marked posterior-inferior extension of the iris, to large and round with a relatively small pupil at transition. Many pre-transitional larvae have a ventral indentation in the iris, sometimes with a dorsal indentation as well, and rare individuals have the narrowed eyes clearly tilted backward. Some transitional individuals develop a particularly bulbous eyeball with a tiny pupil. Transitional larvae develop a scattering of tiny melanophores on the top of the head along with a bar of iridophores slanting upward from the back of the eye and in a stripe from the eye to the pectoral fin base. On the body, large leukophores develop along the base of the dorsal and anal fins and three leukophore patches appear at the base of the upper, mid, and lower segmented caudal fin rays. The larval row of melanophores along the anal-finbase disappears. Transitional recruits develop additional melanophores densely covering the top of the braincase and a scattering on the snout and along the upper jaw and a stripe angling upward from the rear of the eye. Additional melanophores develop in two dense stripes along the body, wider below the lateral midline than above. Stripes develop later along the base of the dorsal and anal fins.


Creative Commons Attribution 3.0 (CC BY 3.0)

© by Benjamin Victor


Belongs to 0 communities

This taxon hasn't been featured in any communities yet.

Learn more about Communities


EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!