Main Ref. | Magtoon, W., 2010 |
Appearance refers to | |
Bones in OsteoBase |
Specialized organs | |
Different appearance | |
Different colors | |
Remarks | Anterior rays in dorsal and anal fin rays are greatly elongated in males, whereas the pelvic fin is elongate in female (Fig. 5). Distal margin of anal fin is convex in males, straight to slightly concave in females. Pelvic-fin rays in females are greatly elongated (Ref. 84389). |
Striking features | |
Body shape lateral | elongated |
Cross section | compressed |
Dorsal head profile | |
Type of eyes | |
Type of mouth/snout | |
Position of mouth | terminal |
Type of scales | |
Diagnosis |
Oryzias songkhramensis is distinguished from all other congeners by possessing the following combination of characters: anal-fin rays 15 - 16 (modally 16), bony contact organs on the anal-fin rays in males; a relatively anterior dorsal fin origin, opposite anal fin 13 - 14 (modally 14); vertebrae 27 - 29 (modally 28); fourth vertebra without neural prezygapophysis; scale relatively large, cycloid; 26 - 29 (modally 27) in a lateral series, predorsal scale 19 - 21 (modally 21); snout length shorter than eye diameter, snout length 12.9 - 31.2% (mean 21.7%) of HL; eye diameter 35.2 - 53.4% (mean 43.2%) of HL; a black spot at the base of pectoral fin, pectoral fin length 13.1 - 24.9% (mean 19.7%) of SL; length of anal fin base 19.4 - 30.0% (mean 25.6%) of SL; caudal peduncle length 11.3 - 20.3% (mean 16.7%) of SL; caudal fin slightly, rounded, length 3.6 - 3.8 (mean 3.7) in SL, black and pale yellow marginal bands on the dorsal and ventral portions of the caudal fin (Ref. 84389). |
Ease of Identification |
Lateral Lines | Interrupted: No |
Scales on lateral line | |
Pored lateral line scales | |
Scales in lateral series | 26 - 27 |
Scale rows above lateral line | |
Scale rows below lateral line | |
Scales around caudal peduncle | |
Barbels | |
Gill clefts (sharks/rays only) | |
Gill rakers | |
on lower limb | |
on upper limb | |
total | |
Vertebrae | |
preanal | |
total | 27 - 29 |
Attributes | |
Fins number | |
Finlets No. | Dorsal |
Ventral | |
Spines total | |
Soft-rays total | 6 - 7 |
Adipose fin |
Attributes |
Fins number | |
Spines total | |
Soft-rays total | 15 - 17 |
Pectoral | Attributes |
Spines | |
Soft-rays 7 - 8 | |
Pelvics | Attributes |
Position | |
Spines | |
Soft-rays 5 - 6 |