Key to the species of
from the rio Amazon basin from "Two new species of Microglanis (Siluriformes: Pseudopimelodidae) from the upper-middle rio Araguaia basin, Central Brazil", William Benedito Gotto Ruiz; Oscar Akio Shibatta
1. Absence of light transverse band on nape; presence of melanophores surrounding the neuromasts of superficial lines, forming series of black dots ....................................... 2
1'. Presence of a light transverse band on nape; absence of melanophores surrounding the neuromasts of superficial lines .......................................................................................... 3
2. Dark brown trunk with light brown stripes imparting a ground color similar to tree bark; absence of light marks on nape; snout length 11.4-12.9% SL ........
2'. Light brown trunk with dark brown saddles below dorsal and adipose fins; light cordiform blotch on nape; snout length 9.1-10.7% SL ..............................
3. Very wide dark-brown stripes on fins ................... ......................................................
3'. Dark brown stripes on fins absent or narrow ..................... 4
4. Lateral line long, reaching the vertical line through middle of adipose fin; number of pores 14-20 ........................ ..................................................................
4'. Lateral line short, not reaching the vertical line through middle of adipose fin; number of pores 3-9 ......................... 5
5. Tip of pectoral-fin spine bifurcated ...................... ...............................................................
5'. Tip of pectoral-fin spine undivided ................................... 6
6. Caudal fin rounded; all anterior serrae of the pectoral spine retrorse, except the last antrorse ...........
6'. Caudal fin slightly bilobed; upper lobe of caudal fin more developed than lower lobe; anterior serrae of pectoral-fin spine antrorse and retrorse, with a single Y-shaped serration in between ............................................................ 7
7. Lateral line reaching the vertical through middle of dorsal-fin base; 5-7 total gill rakers in the first branchial arch; 6 pleural ribs; i,12,i caudal-fin rays ........................... .................................................................
7'. Lateral line reaching the vertical through base of dorsal-fin spine; 3-6 total gill rakers in the first branchial arch; 4-5 pleural ribs; i,10,i or i,11,i caudal-fin rays ..................... .................................................................
And today I learnt that cordiform means heart-shaped!
Jools