TY - JOUR

T1 - Microphallus ochotensis sp. nov. (Digenea, Microphallidae) and relative merits of two-host microphallid life cycles

AU - Галактионов, Кирилл Владимирович

AU - Blasco-Costa, Isabel

N1 - Funding Information: Funding information This study was financed by the Russian Foundation for Basic Research (project no. 16-04-00753) and the programmes of the Russian Academy of Sciences BFundamental Research for the Development of the Russian Arctic Zone^ and the Zoological Institute no. АААА-А17-117030310322-3. This research has been partially funded by the Natural History Museum of Geneva.

PY - 2018/4

Y1 - 2018/4

N2 - A new digenean species, Microphallus ochotensis sp. nov., was described from the intestine of Pacific eiders (Somateria mollissima v-nigrum) from the north of the Sea of Okhotsk. It differs from other microphallids in the structure of the metraterm, which consists of two distinct parts: a sac with spicule-like structures and a short muscular duct opening into the genital atrium. Mi. ochotensis forms a monophyletic clade together with other congeneric species in phylograms derived from the 28S and ITS2 rRNA gene. Its dixenous life cycle was elucidated with the use of the same molecular markers. Encysted metacercariae infective for birds develop inside sporocysts in the first intermediate host, an intertidal mollusc Falsicingula kurilensis. The morphology of metacercariae and adults was described with an emphasis on the structure of terminal genitalia. Considering that Falsicingula occurs at the Pacific coast of North America and that the Pacific eider is capable of trans-continental flights, the distribution of Mi. ochotensis might span the Pacific coast of Alaska and Canada. The range of its final hosts may presumably include other benthos-feeding marine ducks as well as shorebirds. We suggest that a broad occurrence of two-host life cycles in microphallids is associated with parasitism in birds migrating along sea coasts. The chances that migrating birds would stop at a site where both first and second intermediate hosts occur are relatively low. The presence of a single molluscan host in the life cycle increases the probability of transmission.

AB - A new digenean species, Microphallus ochotensis sp. nov., was described from the intestine of Pacific eiders (Somateria mollissima v-nigrum) from the north of the Sea of Okhotsk. It differs from other microphallids in the structure of the metraterm, which consists of two distinct parts: a sac with spicule-like structures and a short muscular duct opening into the genital atrium. Mi. ochotensis forms a monophyletic clade together with other congeneric species in phylograms derived from the 28S and ITS2 rRNA gene. Its dixenous life cycle was elucidated with the use of the same molecular markers. Encysted metacercariae infective for birds develop inside sporocysts in the first intermediate host, an intertidal mollusc Falsicingula kurilensis. The morphology of metacercariae and adults was described with an emphasis on the structure of terminal genitalia. Considering that Falsicingula occurs at the Pacific coast of North America and that the Pacific eider is capable of trans-continental flights, the distribution of Mi. ochotensis might span the Pacific coast of Alaska and Canada. The range of its final hosts may presumably include other benthos-feeding marine ducks as well as shorebirds. We suggest that a broad occurrence of two-host life cycles in microphallids is associated with parasitism in birds migrating along sea coasts. The chances that migrating birds would stop at a site where both first and second intermediate hosts occur are relatively low. The presence of a single molluscan host in the life cycle increases the probability of transmission.

KW - Digenea

KW - Microphallidae

KW - трематоды

KW - морские паразиты

KW - жизненный цикл

KW - молекулярная филогенетика

KW - тихоокеанское распространение

KW - Digenea

KW - Microphallidae

KW - Trematoda

KW - Marine parasites

KW - Life cycle

KW - Molecular phylogeny

KW - Pacific distribution

KW - Marine ducks

KW - Marine ducks

KW - PHYLOGENY

KW - MAXIMUM-LIKELIHOOD

KW - SCHISTOSOMA-MANSONI

KW - METACERCARIAE

KW - INTERMEDIATE HOSTS

KW - LEVINSENIELLA-BRACHYSOMA

KW - PATAGONIAN COAST

KW - TREMATODA

KW - COMMON EIDERS

KW - FAMILY MICROPHALLIDAE

UR - http://www.scopus.com/inward/record.url?scp=85044304308&partnerID=8YFLogxK

UR - http://www.mendeley.com/research/microphallus-ochotensis-sp-nov-digenea-microphallidae-relative-merits-twohost-microphallid-life-cycl

U2 - 10.1007/s00436-018-5782-1

DO - 10.1007/s00436-018-5782-1

M3 - Article

VL - 117

SP - 1051

EP - 1068

JO - Parasitology Research

JF - Parasitology Research

SN - 0932-0113

IS - 4

ER -