title: On a New Species of Parasitic Barnacle (Crustacea: Rhizocephala), Sacculina shiinoi sp. nov., Parasitizing Japanese Mud Shrimps Upogebia spp. (Decapoda: Thalassinidea: Upogebiidae), Including a Description of a Novel Morphological Structure in the Rhizocephala.
abstract: The rhizocephalan Sacculina shiinoi sp. nov. parasitizes three species of Upogebia in Japan. It is described morphologically and compared with another Upogebia parasite, Sacculina upogebiae Shiino, 1943 from Japan and Korea. These two species are the only sacculinids that parasitize mud shrimps. DNA analyses clearly show the two species to be separate and not closely related. The cuticle differs in being provided with close-set, branched, and spiny excrescences in S. shiinoi, while it lacks excrescences, but forms small scales in S. upogebiae. In S. upogebiae, the bulbous sperm-producing part and the narrow receptacle duct are separated by a compartmentalized mid portion, which is missing in S. shiinoi. A ridge, having a thickened, fluffy cuticle with a U-shaped course, passes across the visceral mass between the two receptacle openings in S. shiinoi. Such a structure has never been described in other rhizocephalans, and its function is uncertain.
authors.affiliation: 1 Marine Biology Section, Biological Department, Copenhagen University, Universitetsparken 4, DK2100, Copenhagen Ø, Denmark.
authors.forename: Jørgen
authors.initials: J
authors.lastname: Lützen
authors.affiliation: 2 Laboratory of Marine Symbiotic Biology, Faculty of Education, Kochi University, 2-5-1 Akebono, Kochi 780-8520, Japan.
authors.forename: Gyo
authors.initials: G
authors.lastname: Itani
authors.affiliation: 1 Marine Biology Section, Biological Department, Copenhagen University, Universitetsparken 4, DK2100, Copenhagen Ø, Denmark.
authors.forename: Åse
authors.initials: Å
authors.lastname: Jespersen
authors.affiliation: 3 Department of Ocean Science College of Natural Sciences, Inha University, Incheon 22212, Republic of Korea.
authors.forename: Jae-Sang
authors.initials: JS
authors.lastname: Hong
authors.affiliation: 4 Marine Biodiversity, Department of Biology, University of Bergen, Thormøhlensgate 53a, Box 7800 N-5020, Bergen, Norway.
authors.forename: David
authors.initials: D
authors.lastname: Rees
authors.affiliation: 4 Marine Biodiversity, Department of Biology, University of Bergen, Thormøhlensgate 53a, Box 7800 N-5020, Bergen, Norway.|5 CMEC, Natural History Museum, University of Copenhagen, Denmark. Universitetsparken 4, DK2100, Copenhagen Ø, Denmark.
authors.forename: Henrik
authors.initials: H
authors.lastname: Glenner
mesh_terms: D000818:Animals; D003445:Crustacea / Q000033:anatomy & histology* / Q000145:classification* / Q000469:parasitology / Q000502:physiology; D006790:Host-Parasite Interactions; D013045:Species Specificity
keywords: DNA analysis; Rhizocephala; Sacculina shiinoi; Sacculina upogebiae; Upogebia