Alcataenia longicervica sp. n. from murres, Uria lomvia (Linnaeus) and Uria aalge (Pontoppidan) in the North Pacific basin, with redescriptions of Alcataenia armillaris (Rudolphi, 1810) and Alcataenia meinertzhageni (Baer, 1956) (Cestoda: Dilepididae)

Alcataenia longicervica sp. n. (Cestoda: Dilepididae) is described from murres, Uria spp., in Alaska and other localities in the Pacific basin. From Alcataenia armillaris (Rudolphi, 1810), which it most closely resembles, A. longicervica is distinguished by larger size of organs (cirrus sac, vitelli...

Full description

Bibliographic Details
Main Author: Hoberg, Eric P.
Format: Text
Language:unknown
Published: DigitalCommons@University of Nebraska - Lincoln 1984
Subjects:
Online Access:https://digitalcommons.unl.edu/parasitologyfacpubs/785
https://digitalcommons.unl.edu/context/parasitologyfacpubs/article/1796/viewcontent/Hoberg_Alcataenia_longicervica_Can_J._Zool_1984.pdf
Description
Summary:Alcataenia longicervica sp. n. (Cestoda: Dilepididae) is described from murres, Uria spp., in Alaska and other localities in the Pacific basin. From Alcataenia armillaris (Rudolphi, 1810), which it most closely resembles, A. longicervica is distinguished by larger size of organs (cirrus sac, vitelline gland, and seminal receptacle), greater number of testes, and extremely long neck. In specimens of A. longicervica there are 22-27 rostellar hooks distributed in two rows. Hooks in the anterior row measure 41-49 μm in length while those in the posterior are 38-48 μm. Two species of Alcataenia, A. armillaris and A. meinertzhageni (Baer, 1956), both characteristic cestodes of birds of the genus Uria Brisson, are redescribed from material from the North Pacific basin and are compared with descriptions of specimens from the North Atlantic region. French abstract: On trouvera ici la description d’Alcataenia longicervica n. sp. (Cestoda: Dilepididae), parasite des marmettes Uria spp. en Alaska et ailleurs dans le Pacifique. 11 se distingue d’A. armillaris (Rudolphi, 1810), l'espèce la plus proche, par la taille plus grande de ses organes (poche du cirre, glande vitelline et réceptacle séminal), le nombre plus élevé de ses testicules et son cou extrêmement allongé. Le rostellum comporte 22-27 crochets disposés en deux rangées: ceux de la rangée antérieure ont 41-49 μm de longeur et ceux de la rangée postérieure mesurent 38-48 μm. On trouvera aussi de nouvelles descriptions d’A. armillaris et d’A. meinertzhageni, deux cestodes caractéristiques des oiseaux du genre Uria Brisson; ces descriptions ont été faites à partir de spécimens du Pacifique Nord et ont pu être comparées aux descriptions de spécimens de l’Atlantique Nord.