I recently got a paper on the concept of speciesism published in the The Journal of Agricultural and Environmental Ethics. The journal’s final version of the paper is here. The paper tries to clarify in some detail what is speciesism, as well as to classify the different ways in which it is defended and to distinguish it from other concepts related to it.
You can download the paper here:
Ética más allá de la especie 
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Disculpe, quisiera saber si cuenta con éste documento en idioma español. Me gustaría leerlo sin perder la esencia de él producto de posibles malas traducciones.
Hola Carolina, no está aún traducido al español, aunque otros textos presentando argumentos semejantes se encuentran aquí:
https://masalladelaespecie.wordpress.com/2009/03/28/terminos-basicos-para-el-analisis-del-especismo/
https://masalladelaespecie.wordpress.com/2012/05/27/tomandonos-en-serio-la-consideracion-moral-de-los-animales-mas-alla-del-especismo-y-el-ecologismo/
¡Saludos!