Iso (genus)
Iso is a genus of ears Fishy ( Siluriformes ), which occurs with five species in the surf zone, especially on rocky shores of the tropical Indo-Pacific.
Features
Iso - species are small fish and only four to eight inches long. Your body is strongly flattened laterally, reaches its greatest height at the pelvic fin base and then to the tail fins handle increasingly flatter. The ventral edge is like the hull. The head is small, rounded the " snout" ( region between the eyes and mouth tip), the mouth is oblique. The premaxilla is not protaktil ( vorstülpbar ) and connected to the skull by a central frenulum. The maxilla is slightly concave front. The maxillary teeth on the premaxilla and the mandible are small, but well developed and bent backwards. Also, the vomer is dentate in some species, palatine teeth still missing. The gill openings are large, well developed gills Reuse rays on the first branchial arch.
Iso - species are silvery, a dark longitudinal band extending from the pectoral fin base to the caudal peduncle. The scales are oval, the head is scaleless. The pectoral fins are high, the pelvic fins low.
- Fins formula: Dorsal 1 III -VI, dorsal 2 i/1/9-16, Anal i/1/19-27.
- Shed Formula 42-55 (MLR )
System
The first species of the genus Iso rhothophilus was in 1901 described rhothopilus by the Irish naturalist William Ogilby as Tropidostethus. Since the genus name Tropidostethus was however already assigned to a Spring terror genre, Iso 1901 was erected as a new genus by the American ichthyologists Jordan & Starks and initially allocated to the New World ears fish ( Atherinopsidae ). 1964, the American ichthyologist Donn Rosen then the monotypic family Isonidae for the genre on. Dyer and Chernoff arranged Iso 1996 Notocheiridae family, because they looked at Iso and Notocheirus as sister genera. For the Notocheiridae family but they gave only three autapomorphies. 2006, the family Isonidae by Saeed, Ivantsoff & Aarn was revalidated again, as differ Notocheirus and iso by at least 20 features.