Use this identification portal for polychates species. Hope it helps

http://lkcnhm.nus.edu.sg/polychaete/frame.html

Hi, 

You will find Fauvel's works in this link:

http://faunedefrance.org/bibliotheque-virtuelle-numerique/

Use Kristian Fauchald's pink book ( www.vliz.be/imisdocs/publications/123110.pdf) to identify all the animals to family level first. Then, search for appropriate papers for each family, with keys. Take care not to use identification keys for species from another part of the world, as you'll likely get wrong results. Fauvel's keys for example contain species from the Atlantic and Mediterranean coasts of France, and while they may be a good starting point for species from that area, they are now almost 90 years old and do not contain all species. Try to look for reasonably recent papers. Unfortunately I am not aware of any comprehensive key for the Pacific coast of South America... but you could try to contact Sergio Salazar-Vallejo from Mexico. He might have more dedicated literature for the area.

Hope that helps.

Perhaps the series 'taxonomic guide to the Polychaetes of the Northern gulf of Mexico"  by Uebalacker & Johnson (1984) may be of any help. I only got Pdf's of Vol. I, II, IV and VII through the use of internet. below are the links to I and IV, couldn't relocate II and VII.

http://www.google.nl/url?sa=t&rct=j&q=&esrc=s&source=web&cd=12&cad=rja&uact=8&ved=0ahUKEwiZpPO88NbMAhXJExoKHVEtCcEQFghFMAs&url=http%3A%2F%2Fwww.data.boem.gov%2FPI%2FPDFImages%2FESPIS%2F3%2F3864.pdf&usg=AFQjCNF5SPgYMiMNsp3zuA5fftMxBETqPw

http://www.biodiversitylibrary.org/bibliography/4035#/summary

Que tal Eduardo, te comento que puedes encontrar en mi espacio de Research Gate nuestro libro "Poliquetos de México y América Tropical" con acceso libre para bajarlo, en este libro, que además de una clave a las familias de poliquetos de esta zona, podrás encontrar claves a géneros y especies con ilustraciones. Además encontrarás tres publicaciones de tu país en las que he participado como autor. Saludos

For my samples in British Columbia, Canada, I used the Annelida volumes of the Taxonomic Atlas of the Benthic Fauna of the Santa Maria Basin and Western Santa Barbara Channel by Blake at al. I'm sure these volumes could be of great help to id your specimens as well. You can also look under the Tools section of the Southern California Association of Marine Invertebrate Taxonomists (http://www.scamit.org/) which provides lots of free useful id tools. 

Hola Eduardo, para ubicarte a nivel de familias, te sugiero usar la clave interactiva de Australian Biological Resources Study. Lo logras buscando en la web por  polikey alli te sale la dirección, decargas y te dejas llevar por las figuras, incluso puedes seleccionar el área geográfica en donde estas. Debes cargar el motor intk32 con el puedes abrir el programa. Suerte

Eduardo, los tres tomos del libro de Poliquetos de México y América Tropical los puedes bajar en PDF, gratis, en este enlace: http://www.fcb.uanl.mx/silpoly/index.swf

Hay claves para llegar a familias, así como géneros y especies. Éxito!