title: Two new deep-sea stalked barnacles, Arcoscalpellum epeeum sp. nov. and Gymnoscalpellum indopacificum sp. nov., from the Coral Sea, with descriptions of the penis in Gymnoscalpellum dwarf males.
abstract: The present study describes a new species of Arcoscalpellum Hoek, 1907, and a new species of Gymnoscalpellum Newman & Ross, 1971, collected by deep-sea expeditions led by the Muséum national d'Histoire naturelle (Paris) in the Coral Sea off New Caledonia, Papua New Guinea (PNG), the Solomon Islands and Vanuatu. Arcoscalpellum epeeum sp. nov. differs from all described species of Arcoscalpellum by the presence of a long, sharp, sword-shaped carina, which extends beyond the apices of the terga by 1/3 to 1/4 of their length. The species is dioecious, with large females and dwarf males that are sac-like, lack shell plates and are housed in paired receptacles at the inner edges of the scutal plates. Arcoscalpellum epeeum sp. nov. was collected in the waters of New Caledonia and Vanuatu. Gymnoscalpellum indopacificum sp. nov. differs from the six currently described species of Gymnoscalpellum by having a very small inframedian latus and a branched upper latus. The species is dioecious, with large females and dwarf males, the latter composed of 4 shell plates and housed in paired receptacles at the inner edges of the scutal plates. The penis of the dwarf males of G. indopacificum sp. nov. is about 0.8 of the total length of the male and has five side branches extending out along its length. Gymnoscalpellum indopacificum sp. nov. is distributed in the waters of Papua New Guinea, the Solomon Islands and Vanuatu, and represents the first record of this genus in the Indo-Pacific region.
authors.affiliation: Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan.; Email: chankk@gate.sinica.edu.tw.
authors.forename: Benny K K
authors.initials: BK
authors.lastname: Chan
authors.affiliation: UMR7205 ISyEB, Muséum National d'Histoire Naturelle MNHN, Dept. Systematique and Evolution, , 43, rue Cuvier, CP 26, 75005 Paris, France; Email: unknown.
authors.forename: Laure
authors.initials: L
authors.lastname: Corbari
authors.affiliation: Direction des Collections - Invertébrés, Muséum National d'Histoire Naturelle MNHN CP 53, 61, rue Buffon, 75231 Paris Cedex 05, France; Email: unknown.
authors.forename: Paula A Rodriguez
authors.initials: PA
authors.lastname: Moreno
authors.affiliation: Western Australian Museum, Locked Bag 49, Welshpool DC, Western Australia 6986, Australia; Email: unknown.
authors.forename: Diana S
authors.initials: DS
authors.lastname: Jones
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D017753:Ecosystem; D005260:Female; D008297:Male; D008542:Melanesia; D009510:New Caledonia; D009929:Organ Size; D001468:Thoracica / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D009514:Vanuatu