However, phylogenetic studies of other species of annelids belonging to the families Tubificidae, Dorvilleidae, Syllidae, Eunicidae, Onuphidae and Hartemanniellidae have been conducted using molecular markers such as 18S ribosomal DNA (rDNA), as well as 16S mitochondrial rDNA (Dahlgren et al. reesei has previously been characterized using morphological markers (Fauchald, 1973 Luna et al., 2001 ) and phylogenetic studies of this species have not yet been reported. Two populations from the intertidal region have been selected for phylogenetic comparison in part on the basis of a different morphology, namely their reproductive period (Luna et al., 2001).Ī. reesei is found in two locations in the Gulf of Panama, Republic of Panama: one in muddy bottoms at a depth of 27 meters and the other in the sandy bottoms of an intertidal region (Fauchald, 1973). reesei concerning their ecology, embryology and physiology have been performed (Luna et al., 2001 Villalaz et al 2001).Ī. Because these shrimp are a species of key economic importance in Panama, extensive studies of A. reesei is harvested and used locally in Panama to provide feed for the culture systems of penaeid shrimp (D’Croz et al., 1988, Spadafora, 1994). This species consists of individuals that live in a thick mud-walled tube they are carnivorous and extend out of the tube to trap their prey (Villalaz, 1997).

Americonuphis reesei belongs to the Onuphidae family of the phylum Annelida.

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