Graduate Thesis Or Dissertation
 

The morphology of Ismaila monstrosa Bergh (Copepoda)

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  • The morphology of a rather rare parasitic copepod was studied. Ismaila monstrosa Bergh, an endoparasitic copepod was found in the nudibranch, Antiopella fusca, at Coos Bay, Oregon. Many anatomical features were found, which were different from previous descriptions. Males were described for the first time. Young males lacked the gonadal lobes found on the dorsal sides of adult males. Both sexes had similar mouthparts, differing only in size. These mouthparts consisted, like those of Splanchnotrophus, of a bifid labrum, a pair of simple mandibles, a pair of maxillae and a triangular labium with side processes. There was only a single pair of maxillae and they are unusual in that they were found to be setigerous and two-jointed. The distal portion of this characteristic maxilla was biramous, the smaller member often obscure. Because of this and other anatomical factors, I proposed a new variety Ismaila monstrosa var. pacifica and a new subfamily, the Ismailinae. Although the female possessed three pairs of lateral appendages, the male lacked these, having only the two pairs of ventral appendages. In the female specimens there were two pairs of ventral appendages or "stomach-arms". The first pair was bifurcate, the second pair trifurcate. In the male specimens the first pair was uniramous and the second pair unequally biramous. The digestive system was found to be incomplete in both sexes. There were no extensions into the "stomach-arms" No portions of either nervous or circulatory systems were found in the sections. The reproductive system was found to be the major one in the body of the parasite. In the adults of both sexes the gonads were in the dorsal and anterior gonadal lobes. The ovaries connected to an extensively ramified oviduct. The lower part of the oviduct connected to the anterior end of the cement glands. A seminal receptacle was found in the female. In the male two testes were seen in the dorsal gonadal lobes. The vas deferens ran into the lower abdomen where spermatophores could be seen.
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