| 1a. |
Median row of abdominal scutes incomplete; 2-5 anterior scutes present |
> 2 < |
| 1b. |
Median row of abdominal scutes absent or complete; 0-1 anterior median scutes present |
> 4 < |
| 2a. |
Breeding odontodes on side of head long, second row of anterior lateral scutes thickened and forming a smoothly keeled ridge |
> 9 < |
| 2b. |
Breeding odontodes on side of head short, second row of anterior lateral scutes flat and smoothly keeled ridge absent |
> 3 < |
| 3a. |
Snout-mouth length/pectoral fin length larger than 1.0 |
F. platorynchus |
| 3b. |
Snout-mouth length/pectoral fin length smaller than 0.6 |
F. colombiensis |
| 4a. |
Three rows of abdominal scutes |
> 5 < |
| 4b. |
Two rows of abdominal scutes |
> 21 < |
| 5a. |
Four rows of anterior lateral scutes, all rows complete |
> 6 < |
| 5b. |
Five rows of anterior lateral scutes, middle row may be complete or incomplete |
> 15 < |
|
6a. |
Snout-mouth/head length less than 0.5 |
> 7 < |
| 6b. |
Snout-mouth/head length equal or more than 0.5 |
> 12 < |
| 7a. |
Outer rays (except outermost ray) of lower caudal fin lobe darkly pigmented to base; breeding male with head and snout almost totally covered with breeding odontodes |
> 8 < |
|
7b. |
Outer rays (except outermost ray) of lower caudal fin lobe pigmented only at distal end; breeding male with head and snout not almost totally covered with breeding odontodes |
> 10 < |
| 8a. |
Male with small breeding odontodes on head and snout; snout dairly long and narrow |
F. mariaelenae |
| 8b. |
Male with long breeding odontodes on sides of head; snout short and broad |
> 9 < |
| 9a. |
In adult male, with body depth less than snout-mouth length |
F. taphorni |
| 9b. |
In adult male, body depth greater than snout-mouth length |
F. curtirostra |
| 10a. |
Scutes of head and snout lack very dark reticulations |
F. paraguayensis |
| 10b. |
Scutes of head and snout with very dark reticulations |
> 11 < |
| 11a. |
Caudal fin with distinct clear ocellus bar in dark stripes |
F. knerii |
| 11b. |
Caudal fin lacks distinct clear ocellus bar in dark stripes |
F. schreitmuelleri |
| 12a. |
Head and snout of breeding male densely covered with breeding odontodes; males mature at small size (below 100mm); lower body of cleithrum narrow; snout narrow |
F. smithi |
| 12b. |
Head and snout of breeding male sparsely covered with breeding odontodes; males mature at large size (more than 125mm); lower body of cleithrum broad; snout broad |
> 13 < |
| 13a. |
Anterior body scutes diamond in shape; caudal peduncle narrow, last few dorsal scutes longer than wide; no breeding odontodes on preorbital ridge |
F. reticulata |
| 13b. |
Anterior body scutes hexagonal in shape; caudal peduncle broad, last few dorsal scutes wider than long; breeding odontodes on preorbital ridge |
> 14 < |
| 14a. |
Species coming from Amazon river system |
F. oxyrrhyncha |
| 14b. |
Species coming from Paraná river system |
F. hahni |
| 15a. |
Snout-mouth length/head length less than 0.5 |
F. jauruensis |
| 15b. |
Snout-mouth length/head length equal or more than 0.5 |
> 16 < |
| 16a. |
Body depth/pelvic fin length equal or more than 0.86 |
F. hasemani |
| 16b. |
Body depth/pelvic fin length less than 0.86 |
> 17 < |
| 17a. |
Pectoral fin length/snout-mouth length less than 0.62 |
F. gracilis |
| 17b. |
Pectoral fin length/snout-mouth length more than 0.65 |
> 18 < |
| 18a. |
Breeding odontodes not greatly enlarged on lateral scutes; on some individuals first anal and dorsal rays entirely darkly pigmented, other dorsal and anal rays not entirely pigmented |
F. nattereri |
| 18b. |
Large breeding odontodes on lateral scutes; first anal and dorsal rays never more darkly pigmented than other dorsal and anal rays |
> 19 < |
| 19a. |
Snout-mouth length/pectoral fin length more than 1.25; pectoral and pelvic fin rays and spines uniformly pigmented, without distinct dark spots |
F. odontotumulus |
| 19b. |
Snout-mouth length/pectoral fin length equal or less than 1.0; pectoral fins rays and spines with distinct spots |
> 20 < |
| 20a. |
Body depth/pectoral fin length equal or less than 0.41; 24 post-anal plates |
F. isbruckeri |
| 20b. |
Body depth/pectoral fin length more than 0.44; 22-23 post-anal plates |
F. altocorpus |
| 21a. |
Median abdominal scute at base of pelvic fins |
> 22 < |
| 21b. |
No median abdominal scute at base of pelvic fins |
> 25 < |
| 22a. |
In adult, lower body of ceithrum narrow, may be in two parts; preorbital ridge and eye elevated over head |
F. rugosa |
| 22b. |
In adult, lower body of cleithrum broad or very broad; only eye elevated over head |
> 23 < |
| 23a. |
Body of cleithrum very broad |
F. henriquei |
| 23b. |
Body of cleithrum broad |
> 24 < |
| 24a. |
In adult snout-mouth length less then 3.0 times interorbotal with; 2-3 median abdominal scutes at anterior of abdomen |
F. platorynchus |
| 24b. |
In adult, snout-mouth length more than 3.3 times interorbital width; usually 1 median abdominal scute at anterior of the abdomen |
F. amazona |
| 25a. |
Snout-mouth length/interorbotal width equal or less than 1.8 in adult male; outer rays (except outermost ray) of lower caudal fin lobe usually not entirely darkly pigmented from fin base to tip |
> 26 < |
| 25b. |
Snout-mouth length/ interorbital width more than 1.9 in adult male; outer rays (except outermost ray) of lower caudal fin lobe darkly pigmented from fin base to tip but may be interrupted by clear ocellus bar |
F. vittata |
| 26a. |
Pectoral fin does not reach pelvic fin origin; mid-dorsal ridge of head absent in adults |
F. acus |
| 26b. |
Pectoral fin reaches or extends past pelvic fin origin; mid-dorsal ridge present in adults |
> 27 < |
| 27a. |
Head covered by medium-sized breeding odontodes |
F. venezuelensis |
| 27b. |
Head not covered by medium-sized breeding odontodes; small breeding odontodes on preorbital ridge only or absent |
> 28 < |
| 28a. |
Interradial membranes of caudal fin clear; many small breeding odontodes on preorbital ridge |
F. martini |
| 28b. |
Interradial membranes of caudal fin darkly pigmented; few, if any, very small breeding odontodes on preorbital ridge |
F. colombiensis |
; EffectiveNewWin.focus(); "Farlowella platorynchus")
