Neophasis oculata (Chubrik, 1966)
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publication ID |
https://doi.org/ 10.1016/j.ijppaw.2021.05.001 |
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persistent identifier |
https://treatment.plazi.org/id/CB7C1671-006A-FFFA-733B-E0FF7863FA4C |
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treatment provided by |
Felipe |
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scientific name |
Neophasis oculata |
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3.3.2. Metacercariae of Neophasis oculata View in CoL ( Fig. 4 View Fig )
Locality: White Sea; Keret Archipelago, Velikaya Salma Strait (Kandalaksha Bay); Bolshoy Solovetsky Island (Onega Bay).
Host: Shorthorn sculpin Myoxocephalus scorpius .
Other reported hosts: 11 fish species (summarized in Bray and Gibson, 1991).
Sites: Fins, muscles.
Vouchers: Paragenophores (NO004, NO005) corresponding to isolates No 5 and 7 deposited in the collection of the Department of Invertebrate Zoology of Saint Petersburg University .
Description: Measurements in Table 3.
Metacercariae enclosed in round to oval cyst ( Figs. 4A View Fig ), 362–511 (431) × 316–412 (368) (measurements based on 10 ethanol-fixed specimens). Cyst two-layered ( Fig. 5A View Fig ), outer layer opaque and soft, inner layer transparent and elastic. Metacercariae extracted from cyst oval, elongated, with wider hindbody and narrowed ends ( Figs. 4B View Fig and 5A View Fig ). Spines in forebody with serrated tips, in hindbody simple, pointed ( Fig. 5D–F View Fig ); size and density decreasing towards posterior end. Oral sucker subterminal, round to oval ( Fig. 4B View Fig ; 5A, D View Fig ). Ventral sucker round, closer to anterior end ( Fig. 4B View Fig ; 5A, D View Fig ). Prepharynx long ( Fig. 4B View Fig ; 5A View Fig ). Pharynx oval ( Fig. 4B View Fig ; 5A View Fig ). Oesophagus short ( Fig. 4B View Fig ; 5A View Fig ). Ceca wide, extending to posterior body end, terminating blindly laterally to excretory vesicle; lumen formed ( Fig. 4B View Fig ; 5A View Fig ). Uroproct absent. Cerebral ganglion dorsal to prepharynx ( Fig. 4B View Fig ). Pigmented eyespots disintegrated and pigment dispersed ( Fig. 4B View Fig ; 5A View Fig ). Unpigmented eyespot absent. Excretory vesicle egg-shaped, voluminous ( Figs. 4B View Fig and 5A View Fig ), thin-walled ( Figs. 4B View Fig and 5A, C View Fig ), filled with opaque globules ( Fig. 4A View Fig ), extending to level of ovary (4B; 5A). Excretory pore terminal ( Fig. 4A View Fig ). Excretory system of ‘‘Mesostoma” type. Excretory formula not determined. Reproductive system underdeveloped, primordia of all organs clearly distinguishable ( Fig. 4B View Fig ). Testes large, round, oblique, in hindbody, posterior testis larger than anterior one ( Fig. 4B View Fig ; 5A View Fig ). Vasa efferentia visible ( Fig. 4A View Fig ). Cirrus-sac long, C-shaped, dextral, reaching into hindbody ( Fig. 4B View Fig ; 5A View Fig ). Developing bipartite seminal vesicle, pars prostatica and ejaculatory duct discernible within cirrus-sac ( Fig. 4B View Fig ; 5C View Fig ). Gametogenesis in testes at initial stages ( Fig. 5C View Fig ). Genital atrium small. Genital pore median, anterior to ventral sucker ( Fig. 4B View Fig ). Ovary round, dextral, closer to ventral side ( Fig. 4B View Fig ; 5A View Fig ). Oviduct starting at dorsal side of ovary ( Fig. 4B View Fig ; 5A View Fig ). Laurer’ s canal short ( Fig. 4B View Fig ). Ootype prominent, dorso-medial, anterior to excretory vesicle ( Fig. 4B View Fig ; 5A View Fig ). Uterus short, coiled, ventral to ootype ( Fig. 4B View Fig ). Metraterm sinistral, dorsal to ventral sucker ( Fig. 4B View Fig ). Primordium of vitellarium H-shaped, its middle part close to ootype, longitudinal parts with short lateral claviform outgrowths (developing vitelline follicles) ( Fig. 4B View Fig ; 5C View Fig ). Lumen in ducts of female reproductive system absent, except in metraterm ( Fig. 4B View Fig ; 5C View Fig ). Gametogenesis in ovary not started.
Remarks:
Metacercariae of N. oculata were found in M. scorpius from the White Sea throughout the observation period. We do not provide the data on prevalence and intensity of metacercariae infection since the hosts were examined only to collect material for molecular and morphological studies.
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