# Microcotyle eueides
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{{short description|Species of worms}}
{{Speciesbox
| image =
| image_caption =
| genus = Microcotyle
| species = eueides
| authority = MacCallum & MacCallum, 1913
| synonyms = *''Caenomicrocotyle (Caenomicrocotyle) eueides'' (MacCallum & MacCallum, 1913) Unnithan1971[MacCallum, G. A., & MacCallum, W. G. (1913). Four species of ''Microcotyle'', ''M. pyragraphorus'', ''macroura'', ''eueides'' and ''acanthophallus''. Zoologische Jahrbücher Abteilung für Systematik, 34, 223-244. https://www.biodiversitylibrary.org/page/9988712#page/233/mode/1up {{open access}}]
==Systematics==
''Microcotyle eueides'' was first described by MacCallum & MacCallum (1913) from the gills of the striped bass ''[Morone saxatilis](/source/Morone_saxatilis)'' ([Moronidae](/source/Moronidae)), designated as ''Roccus lineatus'' in the original publication.[Unnithan, R. V. (1971). On the functional morphology of a new fauna of Monogenoidea on fishes from Trivandrum and environs. Part IV. Microcotylidae sensu stricto and its repartition into subsidiary taxa. American Midland Naturalist, 366-398.] However, this species was returned to the genus ''[Microcotyle](/source/Microcotyle)'' by Mamaev in 1986.[Mamaev, Y. L. (1986). The taxonomical composition of the family Microcotylidae Taschenberg, 1879 (Monogenea). Folia Parasitologica, 33, 199-206. [https://folia.paru.cas.cz/pdfs/fol/1986/03/02.pdf PDF] {{open access}}]
==Morphology==
''Microcotyle eueides'' has the general morphology of all species of ''[Microcotyle](/source/Microcotyle)'', with a symmetrical very delicate and thin body, narrowed at each end and comprising an anterior part which contains most organs and a posterior part called the [haptor](/source/haptor). The haptor is symmetrical, and bears [clamps](/source/clamp_(zoology)), arranged as two rows, one on each side. The clamps of the haptor attach the animal to the [gill](/source/gill) of the fish. There are also two buccal lateral, imperforate [suckers](/source/sucker_(zoology)) at the anterior extremity. The digestive organs include an anterior, terminal mouth, a small and inconspicuous pharynx, an [oesophagus](/source/oesophagus) and a posterior [intestine](/source/intestine) with two lateral branches provided with numerous secondary branches; the branches extends far back into the haptor. Each adult contains male and female reproductive organs. The reproductive organs include an anterior genital atrium, armed with numerous [spines](/source/spine_(zoology)), a medio-dorsal [vagina](/source/vagina), a single large [ovary](/source/ovary) coiled across the middle of the body and 32 small [testes](/source/testicle) which are posterior to the ovary. The eggs are elliptical, with a very long and delicate anterior filament that becomes coiled in a dense mass just near the opening of the uterus.