Morphology Data of Nothobranchius rosenstocki
Identification keys
Main Ref. Valdesalici, S. and R.H. Wildekamp, 2005
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

Diagnosis: This species is distinguished from its congeners by the following combination of unique characters: 15-17 dorsal fin rays; 16-17 anal fin rays; male coloration with irregular red reticulation contrasting with light blue background color on the entire body. The frontal and superior portion of the head red; anal fin with a red distal part. The caudal fin base is red spotted, with distal part transparent light blue. The anterior part of base of dorsal fin has distinct black spots and hardly visible papillae. Sides of female are not marked like the males, but with narrow brown scale margins (Ref. 53985).

Description: The species is deep-bodied, with rounded snout and a terminal mouth directed upward. The scales on median longitudinal row 28-30 + 2-4 on caudal fin base. Variable pattern of cephalic scalation, although most specimens studied show G-type. The anterior neuromast series of 'open' type; central series in two shallow grooves, lined with low lobes. Posterior cephalic neuromast series in curved shallow pits on each side. Preopercular neuromast system in open groove, with distal ridge slightly overlapping the opercle.

Male body laterally compressed; dorsal profile convex between snout and beginning of dorsal fin: in older males dorsal profile slightly concave on supraoccipital area; all unpaired fins are rounded, dorsal and anal fin present small papillate contact organs; opercular membrane is projecting from opercle, distal edge slightly wrinkled. Females are smaller than males, the maximum size observed is 38.9 mm TL; its body less compressed and less deep; dorsal and caudal fin rounded, anal fin triangular with tip rounded; anal fin positioned more posteriorly than in the male; no papillate contact organs on dorsal and anal fin; opercular membrane not projecting from the opercle. (Ref. 53985).

Ease of Identification

Meristic characteristics of Nothobranchius rosenstocki

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 15 - 17
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 16 - 17

Paired fins

Pectoral Attributes  
Pelvics Attributes  
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
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