Redescription of Sciadocephalus megalodiscus Diesing, 1850, An Unusual Neotropical Fish Tapeworm (Cestoda: Proteocephalidae)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F18%3A00498806" target="_blank" >RIV/60077344:_____/18:00498806 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1645/18-25" target="_blank" >http://dx.doi.org/10.1645/18-25</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1645/18-25" target="_blank" >10.1645/18-25</a>
Alternative languages
Result language
angličtina
Original language name
Redescription of Sciadocephalus megalodiscus Diesing, 1850, An Unusual Neotropical Fish Tapeworm (Cestoda: Proteocephalidae)
Original language description
The tapeworm Sciadocephalus megalodiscus Diesing, 1850 (Cestoda: Proteocephalidae), is redescribed based on newly collected specimens parasitizing tucunare peacock bass, Cichla monoculus Agassiz, 1831 (Perciformes: Cichlidae), in the Peruvian Amazon. Even though this cestode was redescribed 2 decades ago, that redescription did not report some of the unique features of this species. The most unusual characteristics of the species are (1) peculiar formation of the uterus, with fast formation of numerous, tightly packed diverticula protruding ventrally and dorsally, with simultaneous disintegration of the ovary and vitelline follicles in the first pregravid proglottids, (2) inverted umbrella-shaped scolex with a well-developed apical sucker, (3) a large-sized, follicular (grape cluster-like) ovary, which occupies most of the central (median) third of proglottids, with the ovarian isthmus situated almost equatorially, (4) regular alternation of genital pores, (5) a well-developed internal seminal vesicle, and (6) a small-sized strobila (shorter than 6 mm) consisting of few proglottids (15-20). Preliminary molecular data reveal S. megalodiscus to be most closely related to Cichlidocestus gillesi, the type species of the recently erected Cichlidocestus de Chambrier, Pinacho-Pinacho, Hernández-Orts, and Scholz, 2017. Species of both genera parasitize Neotropical cichlids and are unique among all proteocephalids in the shape and position of the ovary. They also share other morphological characteristics unusual among other proteocephalids, and thus these 2 genera can be considered good candidates to be placed in a new, higher-level taxon such as separate subfamily or even family when a new, more natural classification of the Proteocephalidae is proposed.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
40301 - Veterinary science
Result continuities
Project
<a href="/en/project/GBP505%2F12%2FG112" target="_blank" >GBP505/12/G112: ECIP - European Centre of Ichtyoparasitology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Parasitology
ISSN
0022-3395
e-ISSN
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Volume of the periodical
104
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
6
Pages from-to
523-529
UT code for WoS article
000448687300009
EID of the result in the Scopus database
2-s2.0-85055596083