A new species of Isotomiella from Pará State is described and illustrated. This new species belongs to the digitata group, but differs from other by the number of chaetae on manubrium and dens, teeth on the tenaculum and size of the sensilla on abdominal tergites V-VI.
KEY WORDS:
Biodiversity; digitata group; taxonomy
| I. digitata | I. distincta | I. falcata | I. louisi sp.nov. | |
|---|---|---|---|---|
| Body size (mm) | 0.40-0.45 | 0.43 | 0.70 | 0.71 |
| Labral chaetae | ? | ? | ? | 4/5,5,4 |
| Sublobal hairs | 3 | ? | 3 | 3 |
| Tergal macrosensilla | 3,2/1,1,2,1,5 | ? | ? | 3,2/1,1,2,1,5 |
| Digitiform tibiotarsal chaetae | 4 | 2 | 5 | 5 |
| Ventral tube chaetae | 5+5distal | 3+3 distal | 3+3distal | 5+5 distal |
| 3+3 anterior | 1+1 anterior | 1+1 anterior | 3+3 anterior | |
| 2+2 posterior | 1+1 posterior | 1+1 posterior | 2+2 posterior | |
| Ratio length sensillum spl/claw | 1.4-1.5 | 2.5-3 | 2.5-3 | 1.9 |
| Tenaculum teeth/chaetae | 3+3/1 | 3+3/1 | 3+3/1 | 4+4/1 |
| Manubrium anterior chaetae | 1+1 | 1+1 | 1+1 | 2+2 |
| Manubrium posterior chaetae | 6+6 | ? | ? | 10+10 |
| Dens anterior chaetae | 6 | 6 | 6 | 13 |
| Dens posterior chaetae | 1 | 1 | 1 | 2 |
| Type of mucro | bidentate | bidentate | falcate | bidentate |
Thumbnail
Thumbnail
