Redescription of Botryllophilus inaequipes Hansen, 1923 (Crustacea: Copepoda: Cyclopoida: Ascidicolidae)

摘要

Hansen (1923) described the female of Botryllophilus inaequipes based on three specimens, which he designated as syntypes, collected from the Davis Strait. One syntype (with segmented metasome) on loan from the Zoological Museum, University of Copenhagen, could be identified as B. inaequipes; the other two syntypes (with unsegmented metasome) are a different species. The redescription, based on the specimen of B. inaequipes, confirms that most of the appendages of this copepod show diagnostic features of female morphotype A (subgroup 1) of the genus. The paragnams (with free distal portion), labrum (with middistal lobe), and copulatory organs (comprising tubular copulatory pores and large seminal receptacles), studied for the first time, are thought to be unique for the species.