Microcotyle omanae n. sp. (Monogenea: Microcotylidae), a parasite of Cheimerius nufar (Valenciennes) (Sparidae) from the Arabian Sea

Abstract

Microcotyle omanae n. sp. (Monogenea: Microcotylidae) is described from the gills of Cheimerius nufar (Valenciennes) (Sparidae) from the Arabian Sea. The new species closely resembles Microcotyle arripis Sandars, 1945, M. helotes Sandars, 1944, M. caudata Goto, 1984 and M. sebastis Goto, 1984, which have also been found in the Indo-Pacific. Microcotyle omanae n. sp. differs from M. arripis, M. helotes and M. caudata by its greater number of testes, from M. arripis, M. helotes by its greater length of the genital atrium, length/width ratio of the genital atrium and length of the eggs, and from M. helotes also in greater width of the clamps, from M. caudata and M. sebastis in its greater number of clamps and additionally from M. sebastis by its smaller genital atrial spines and clamps and by the ratio between length and width of the genital atrium. Moreover, the mature specimens of the new species have greater average body length than all above mentioned species. Correlations between 15 morphometric characters and body length are analysed in the new species, and their significance for species differentiation is discussed.

Microcotyle visa n. sp. (Monogenea: Microcotylidae), a gill parasite of Pagrus caeruleostictus (Valenciennes) (Teleostei: Sparidae) off the Algerian coast, Western Mediterranean

“…A molecular study of the cox1 gene, unfortunately limited to a small number of samples, showed that the intraspecific distance was low (1.4%), especially when compared with distances between established species (10.2-15.0%). Intraspecific variations in body size in polyopisthocotylean monogeneans are well known, and the literature contains many examples of authors discussing artefacts of fixation and effect of flattening on the size of organs (Goto, 1894;Sproston, 1946;Justine, 2011;Machkewskyi et al, 2013). In Table 5, we compiled published results concerning the intraspecific differences of cox1 sequences.…”

“…During the 21st century, new genera (Omanicotyle Yoon, Al-Jufaili, Freeman, Bron, Paladini & Shinn, 2013, Paranaella Kohn, Baptista-Farias & Cohen, 2000 (see Kohn et al, 2000;Yoon et al, 2013) and species [Microcotyle algeriensis Ayadi, Gey, Justine & Tazerouti, 2017, M. argenticus Hadi & Bilqees, 2011, M. rubrum Hadi & Bilqees, M. jonii Hadi, Bilqees & Khatoon, 2011, M. omanae Machkewskyi, Dmitrieva, Al-Jufaili & Al-Mazrooei, 2013 and Polylabris bengalensis Sailaja & Madhavi, 2011] have been added to this family (Hadi & Bilqees 2010, 2011Sailaja & Madhavi, 2011;Machkewskyi et al, 2013;Ayadi et al, 2017).…”

“…Microcotyle: M. omanae from Cheimerius nufar; M. archosargi from Archosargus probatocephalus; and M. erythrini from Pagellus erythrinus (see van Bene-den & Hesse,1863;MacCallum, 1913;Machkewskyi et al, 2013). Only the latter species occurs in the Mediterranean.…”

Marine Parasites of Omani Waters: State of knowledge

“…Each host sample contained about 10-15 specimens, fresh fish were bought from landing sites or local fish markets and were immediately kept in cool bags and transported to the Laboratory of Aquatic Parasitology (Ministry of Agriculture and Fisheries Wealth, Oman). Fish were either freshly examined, kept in fridge during examination for at least 48 hrs or immediately frozen at -47°C for longer duration.The examination of fish and preparation of total mounts was carried out following the method of complete parasitological dissection and modified method of staining with acetic carmine [10,11]. Skin, gills, fins, abdominal organs, bits of muscles were removed, placed in seawater (or saline solution) and checked for parasites under a Zeiss Stemi 2000-C dissecting microscope.…”

Biological and Ecological Features of Poecilancistrum Sp. Plerocercoid (Cestoda: Trypanorhyncha) Infection of Arabian Sea Meager Argyrosomus heinii (Steindachner, 1907)

“…The worms collected were gently pressed between cover slip and glass slide and fixed using AFA (Acetic acid-Formalin-Alcohol) solution. Some of the cestodes were stained with Mayer's paracarmine [12], the others were stained with acetocarmine (Russian modification) [13], dehydrated using an ethanol series (80-100%) and mounted in Canada balsam.…”