Diplocardia, Damoff & Carrera-Martínez, 2025

Key to species of Diplocardia View in CoL with posteriorly displaced male field

1. Male field in xxi–xxiii; clitellum in xii–xxi, xxii............................................................ 2

- Male field in xix–xxi or xx–xxii; clitellum ending at or before xx............................................... 4

2. Testes in xi only; prostomium prolobous......................................................... D. montana

- Testes in x and xi; prostomium epilobous.................................................................. 3

3. Penial setae present, straighten, 25–30 μm long; typhlosole small, <1/10 of the intestinal lumen........... D. californica

- Penial setae absent or not modified; typhlosole medium, about 1/5 of the intestinal lumen.................... D. woodi

4. Male field in xx–xxii.................................................................................. 5

- Male field in xix–xxi.................................................................................. 6

5. Intestinal origin in xv; typhlosole absent (at least in the anterior 40 segments).............................. D. keyesi View in CoL

- Intestinal origin in xix; typhlosole present......................................................... D. texensis

6. Genital tumesces absent; penial setae absent or not modified................................... D. farrishi sp. nov.

- Genital tumesces present in several segments between vii–xxiv; penial setae present or sometimes absent or not modified...................................................................................................... 7

7. Clitellum annular; intestinal origin in xviii....................................................... D. patuxentis

- Clitellum saddle-shaped; intestines starting in xvi, either abrupt or gradual............................. D. verrucosa View in CoL