Folia Parasitologica 51[2/3] 229-237 (2004) | DOI: 10.14411/fp.2004.028

Some aspects of the biology and life history of Bothitrema bothi (Monogenea: Bothitrematidae) from the flounder Scophthalmus aquosus (Bothidae) from New Jersey, USA

Sherman S. Hendrix
Department of Biology, Gettysburg College, Gettysburg, PA 17325, USA

Bothitrema bothi (MacCallum, 1913), a monopisthocotylean monogenean (Bothitrematidae) found on gills and occasionally on the olfactory rosette within the nares of the bothid flounder, Scophthalmus aquosus (Mitchill, 1815), is distributed along the Atlantic coast of the USA from Woods Hole, Massachusetts to Delaware Bay. This study details aspects of the morphology, microecology and biology of the oncomiracidium, juvenile and adult. Adult worms occur almost exclusively between rakers on the first and second gill arches while juveniles occupy secondary gill filaments. Analysis of variance revealed significant arch, side and position effects. Worm attachment and position is maintained largely by suction generated by a circular seal using its 54 radially arranged accessory haptoral sclerotised elements and a marginal valve. A small anterior appendix with two marginal hooks lies dorsal to a deep anteromedian cleft in the haptor, which, together with wall muscles, creates and releases the negative pressure required for attachment. Four pairs of gland openings in the ventrolateral margins of the anterior adhesive area produce secretions for attachment. Operculate eggs with four rounded protuberances and a filament are laid individually at four-minute intervals at 22ºC. Hatching occurs in five days at 20°C. Oncomiracidia have two pairs of eyes, with the posterior pair fused, show both positive and negative phototaxis and swim at a mean rate of 5.2 mm/s at 22°C. Larvae have a circle of 16 hooks and a pair of hamulus primordia. Other accessory haptoral sclerotised structures arise de novo in juveniles after attachment to the host. These data will help to resolve more clearly the relationships of the Bothitrematidae within the Monopisthocotylea.

Keywords: functional morphology, scanning electron microscopy, oncomiracidium, Bothitrema bothi, cholinergic nerves, microecology, Monogenea, Bothitrematidae

Received: December 15, 2003; Accepted: April 26, 2004; Published: June 1, 2004  Show citation

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Hendrix, S.S. (2004). Some aspects of the biology and life history of Bothitrema bothi (Monogenea: Bothitrematidae) from the flounder Scophthalmus aquosus (Bothidae) from New Jersey, USA. Folia Parasitologica, 51(2-3), 229-237. doi: 10.14411/fp.2004.028
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