title: Halomonhystera parasitica n. sp. (Nematoda: Monhysteridae), a parasite of Talorchestia brito (Crustacea: Talitridae) in Portugal.
abstract: Halomonhystera parasitica n. sp. (Monhysterida: Monhysteridae) is described from the body-cavity and under the dorsal plates of the sandy beach amphipod Talorchestia brito Stebbing (Crustacea: Talitridae) in Portugal. The new species differs from previously described members of the genus by a combination of the following characters: four medium-sized cephalic setae; base of stoma with three blunt denticles; posterior dilated portion of stoma absent; amphids small, with width less than quarter of corresponding body width; amphids located less than two labial widths from anterior extremity; uterine eggs elliptical and unembryonated; gubernaculum lacks caudal process; and male tail with two separated pairs of postcloacal papillae and a single subterminal seta-like papilla. This is the first representative of the family Monhysteridae parasitic in the body-cavity of crustaceans. Approximately 48% of the amphipods examined contained various stages of H. parasitica.
authors.affiliation: Department of Zoology, Oregon State University, Corvallis, OR 97331, USA. poinarg@science.oregonstate.edu
authors.forename: George
authors.initials: G
authors.lastname: Poinar
authors.forename: Daniella
authors.initials: D
authors.lastname: Duarte
authors.forename: Maria João
authors.initials: MJ
authors.lastname: Santos
mesh_terms: D033304:Amphipoda / Q000033:anatomy & histology / Q000469:parasitology*; D000818:Animals; D005260:Female; D005618:Fresh Water; D008297:Male; D008855:Microscopy, Electron, Scanning; D009348:Nematoda / Q000145:classification* / Q000302:isolation & purification / Q000648:ultrastructure; D011174:Portugal; D012623:Seawater; D013045:Species Specificity