Travisia Johnston, 1840

Tovar-Hernández, María Ana, Burgess, Dany E., León-González, Jesús Angel De & Hendrickx, Michel E., 2025, Travisiid worms from deep water off Western Mexico with the establishment of a new species (Annelida: Travisiidae), Zootaxa 5729 (2), pp. 349-369 : 365-366

Key to species of Travisia Johnston, 1840 from the North American Pacific

1 Branchia branched; branchiae present from chaetiger 3........................ T. filamentosa de León-González, 1998

- Branchia cirriform.................................................................................... 2

2 Posterior end tapered; body with more than 19 chaetigers..................................................... 3

- Posterior end with a short cylindrical cone, deeply furrowed dorsally; 18 chaetigers................................................................................................... T. oregonensis Fauchald & Hancock, 1981

3 Pygidium with cirri; parapodial lappets well-developed, starting at segment 15.................. T. gigas Hartman, 1938

- Pygidium without cirri; parapodial lappets absent or present in other arrangement.................................. 4

4 Nuchal organs large, teardrop-shaped; parapodial lappets absent.................. Travisia hernandezalcantarai sp. nov.

- Nuchal organs small, discrete, as narrow splits or C-shaped splits............................................... 5

5 Prostomium blunt or truncate, not conical................................................................. 6

- Prostomium pointed, conical............................................................................ 7

6 Branchiae present from chaetiger 2; 31 segments (27 chaetigers); epithelium with entire surface pustulated, not strongly granulated....................................................................... T. foetida Hartman, 1969

- Branchiae present from chaetiger 3; 32 to 50 segments (27‒45 chaetigers); epithelium with large size pustules, crowded over most parts of the body, giving an aspect of close granulation............................... T. granulata Moore, 1923

7 Body fusiform; epithelium fully covered with papillae, papillae not forming rows............ T. fusiformis Kudenov, 1975

- Body robust, grub-like; epithelium with well-defined rows or ridges of papillae at least in some body segments.......... 8

8 Mid-ventral groove present; parapodial lappets well-developed, present in anterior segments......... T. pupa Moore, 1906

- Mid-ventral groove absent; parapodial lappets well-developed in posterior segments.............. T. brevis Moore, 1923