A new genus of groundwater Ameiridae (Copepoda, Harpacticoida) from boreholes in Western Australia and the artificial status of Stygonitocrella Petkovski, 1976

Wonchoel Lee, R. Huys
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引用次数: 23

Abstract

Examination of the copepod fauna inhabiting 50m deep production bores on Barrow Island (northwestern Australia), resulted in the discovery of an unusual ameirid which cannot be placed in any extant genus. Both sexes are characterized by a unisetose antennary exopod and extreme reduction in the swimming legs (particularly the endopods) and P5. Males lack a defined P6 closing off the single genital aperture and have an extraordinarily large spermatophore. Females similarly display a highly reduced genital field. The new species shows superficial similarities to both Psammonitocrella Rouch and Stygonitocrella Reid, Hunt & Stanley, however the combined presence of a sexually dimorphic inner basal spine on P1, a completely fused genital double-somite, reduced antennary exopod and vestigial P5 excludes it from either genus. Some problems in the current classification of freshwater Ameiridae are highlighted, with particular reference to the genus Stygonitocrella . A new genus Neonitocrella is proposed for Stygonitocrella insularis (Miura, 1962).
西澳大利亚地下水井眼蝶科一新属(桡足目,Harpacticoida)及Stygonitocrella Petkovski的人工状况,1976
对居住在巴罗岛(澳大利亚西北部)50米深的生产钻孔中的桡足动物群的检查,导致发现了一种不寻常的菊科植物,它不能被置于任何现存的属中。两性的特点是单倍体触角外足和游泳腿(尤其是内足)和P5的极度减少。雄性缺乏封闭单一生殖孔的明确的P6,并且有一个非常大的精子包囊。雌性也同样表现出高度缩小的生殖器区域。新物种表面上与Psammonitocrella Rouch和Stygonitocrella Reid, Hunt & Stanley相似,但是P1上两性二态的内基底棘,完全融合的生殖双体,减少的触角外足类和退化的P5的共同存在将其排除在任何一个属之外。重点介绍了目前淡水美洲纹科分类中存在的一些问题,特别是关于Stygonitocrella属的分类。提出岛Stygonitocrella的新属Neonitocrella (Miura, 1962)。
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