Echinophthirius horridus
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publication ID |
https://doi.org/ 10.1016/j.ijppaw.2023.100898 |
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persistent identifier |
https://treatment.plazi.org/id/03FD87BB-5202-9E2A-8A7A-4E3AE4610E83 |
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treatment provided by |
Felipe |
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scientific name |
Echinophthirius horridus |
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3.3. Histological investigations of E. horridus View in CoL
In seven seal lice, sampled from one severely with A. spirocauda and E. horridus infected female, juvenile harbour seal from the North Sea ( Table 1), ten filarial stages were visible in histological sections stained with H&E in the pharynx, intestine, haemocoel and head of E. horridus ( Fig. 4A–C View Fig ). The length of filarial stages ranged from a minimum of 5.77 μm length and 3.65 μm width up to a maximum of 70.53 μm length and 3.68 μm width. One filarial stage was visible in the haemocoel of the caudal abdomen of E. horridus , sampled from a moderately E. horridus and mildly A. spirocauda infected female, juvenile harbour seal from the North Sea, measuring 91 μm in length and 3.61 μm in width ( Fig. 4D and E View Fig ). All filarial stages were characterized by typical microfilarial features like a septine shape and a variety of visible cells with dark violet stained nuclei filling the body, which appeared partly dispersed and crowded ( Fig. 4A–E View Fig ) ( World Health Organization, 1997).
3.4. Pathological investigation of seal louse infected skin tissue in grey and harbour seals
Two severely seal louse infected adult grey seals and one severely infected juvenile grey seal were alopecic, one severely infected juvenile harbour seal was not alopecic ( Table 5). Alopecia was not diagnosed in grey or harbour seals of any other level of seal louse infection. Severely infected skin of all investigated grey and harbour seals displayed a
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purulent folliculitis and intralesional bacteria. In one mildly infected harbour seal, a purulent folliculitis was diagnosed. Orthokeratotic hyperkeratosis was seen in one mildly infected grey and four harbour seals. Four mildly infected harbour seals, one harbour seal with moderately infected skin and all four severely infected grey and harbour seals displayed orthokeratotic hyperkeratosis in combination with a mild lymphohistiocytic, perivascular dermatitis. Macroscopically uninfected skin showed mild orthokeratotic hyperkeratosis in one harbour seal and mild orthokeratotic hyperkeratosis with a mild lymphohistiocytic, perivascular dermatitis in three harbour seals ( Table 6).
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