1. Fernández I, Pardos F, Benito J. & Arroyo NL 1999. Acrocoelus glossobalani gen. nov. et sp. nov. (Protista incertae sedis) from the gut of the enteropneust Glossobalanus minutus (Kowalewsky 1866): Invasive stages. European Journal of Protistology 35: 55-65.
2. Fernández I., Arroyo NL, Pardos F & Benito J 1999. Penetration into the Gut Cells of and Enteropneust by the Flagellate Acrocoelus glossobalani Fernández et al. 1998. European Journal of Protistology, 35: 255-263.
3. Arroyo NL & Benito J 2000. New observations on Loxosomella tonsoria, with notes on distribution and host specificity of the genus. Journal of the Marine Biological Association of the UK, 80: 561-562.
4. Abaunza P, Arroyo NL, & Preciado I 2001. A contribution to the knowledge on the morphometric and anatomical characters of Pennella balaenopterae (Copepoda: Pennelidae), with special reference to the buccal complex. Crustaceana, 74 (2): 193-210.
5. Neira C, Gad G, Arroyo NL & Decraemer W 2001. Glochinema bathyperuvensis sp. n. (Nematoda, Epsilonematidae): A new species from Peruvian bathyal sediments, SE Pacific Ocean. Contributions to Zoology, 70 (3), 147-159.
6. Arroyo NL, Abaunza P, & Preciado, I. 2002. The first naupliar stage of Pennella balaenopterae Koren and Danielssen, 1877 (Copepoda: Siphonostomatoida, Pennelidae). Sarsia, 87: 333-337.
7. Arroyo NL, George K, Benito J & Maldonado M. 2003. A new species of Ancorabolidae (Copepoda, Harpacticoida) from the northern coast of Spain: Laophontodes mourois sp. n. Hydrobiologia, 498(1): 169-176.
8. Arroyo NL, Maldonado M, Pérez-Portela P & Benito, J. 2004. Distribution patterns of meiofauna associated with a sublittoral Laminaria bed in the Cantabrian Sea (North-eastern Atlantic). Marine Biology, 144: 231-242.
9. Ólafsson E, Ullberg J & Arroyo NL. 2005. The clam Macoma balthica prevents development of algal mats in shallow soft-bottoms: implications for spatial heterogeneity of meiofaunal assemblages. Marine Ecology Progress Series, 298: 179-188.
10. Arroyo NL, Aarnio, K & Bonsdorff, E. 2006. Drifting algae as a means of re-colonizing defaunated sediments in the Baltic Sea. A microcosm study. Hydrobiologia, 554(1): 83-95.
11. Arroyo NL, Maldonado M & Walters K. 2006. Within- and between-plant distribution of harpacticoid copepods associated with a north-Atlantic bed of Laminaria ochroleuca De la Pylaie. Journal of the Marine Biological Association of the U.K., 86: 309-316.
12. Arroyo NL, Aarnio K, Ólafsson E. 2007. Interactions between two closely related phytal harpacticoid copepods, asymmetric positive and negative effects. Journal of Experimental Marine Biology and Ecology 341: 219-227.