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A New Nematode, Orthomermis Oedobranchus Gen. N., Sp. N. (Mermithidae) Parasitizing Smittia Larvae (Chironomidae) in England

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For more content, see Nematology.

Orthomermis oedobranchus gen. n., sp. n. is described and its relationship in the Mermithidae discussed. It may be a primitive member of the family and possesses a swollen vulvar fin. Most individuals complete their final molt (which is double) in 4 days, but do not develop adult head characters until 1-2 weeks later, an unusual feature in this group. Egg laying begins during molting or immediately afterwards. This nematode parasitizes the larval stage of the three insect species, Smittia sp. (?aterrima Meigen) (Chironomidae); Omalium caesum Gravenhorst (Staphilinidae), and Lycoriella solani (Winn.) (Sciaridae). All hosts died after nematode emergence.

Affiliations: 1: Rothamsted Experimental Station, Harpenden, Herts, England


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