Ariyama Hiroyuki
Osaka Museum of Natural History, Nagai Park, Higashi-Sumiyoshi, Osaka 546-0034 Japan..
Zootaxa. 2019 Feb 11;4554(2):460-496. doi: 10.11646/zootaxa.4554.2.6.
One species of Austromaera Lowry Springthorpe, 2005 and four species of Quadrimaera Krapp-Schickel Ruffo, 2000 included in the Maera clade, are described from Japan. Austromaera ariakensis sp. nov. is described, based on collections from Ariake Sea and can be distinguished from its congeners by the acutely produced coxa 1 and the merus of gnathopod 2 with a small posterodistal spine. Quadrimaera gotoensis sp. nov. from Goto Islands in Nagasaki Prefecture has a small quadrate excavation on the middle palmar margin of the male gnathopod 2. This new species is different from Q. mirandella Appadoo, Myers Fagoonee, 2002 having such an excavation, in the larger posterodistal tooth of the male gnathopod 2 propodus and the wider bases of the pereopods 5-7. Quadrimaera pacifica (Schellenberg, 1938) was collected from many localities from Iwate Prefecture to Ariake Sea. This species is characterized by the transverse palm of the male gnathopod 2 with the large posterodistal tooth, the small rounded excavation in the middle and the anterior lobe narrower and produced more distally than the posterior lobe. Morphology of Q. pacifica is variable in the posterior excavation of the male gnathopod 2 palm, the uropod 3 rami and the distal end of the telson. Quadrimaera quadrimana (Dana, 1853) from the south of Yakushima Island in Kagoshima Prefecture has a distinct palm of the male gnathopod 2 with three excavations. Quadrimaera setibasis sp. nov. collected from the intertidal zone in Osaka Prefecture has a setose basis of the pereopod 6 like Q. schellenbergi (Ruffo 1938), but the bases of the pereopods 5 and 7 are not setose. A key to species of Austromaera in the world is provided.
2005年的Austromaera Lowry Springthorpe属的一个物种以及Maera分支中2000年的Quadrimaera Krapp-Schickel Ruffo属的四个物种，是在日本被描述的。新物种Austromaera ariakensis sp. nov.是根据有明海的标本描述的，它可通过第一触角基节尖锐突出以及第二颚足座节具一小的后腹缘刺与其同属物种相区分。来自长崎县五岛列岛的新物种Quadrimaera gotoensis sp. nov.，其雄性第二颚足掌节中部有一个小的方形凹陷。这个新物种与2002年的Quadrimaera mirandella Appadoo、Myers Fagoonee有这种凹陷的情况不同，在于雄性第二颚足腕节较大的后腹缘齿以及第5至7步足更宽的基部。Quadrimaera pacifica (Schellenberg, 1938)是从岩手县到有明海的许多地方采集到的。该物种的特征是雄性第二颚足掌节横向，具大的后腹缘齿，中部有小的圆形凹陷，前叶比后叶更窄且向远端延伸更多。Quadrimaera pacifica的形态在雄性第二颚足掌节的后凹陷、尾肢外肢以及尾节末端方面存在变化。来自鹿儿岛县屋久岛南部的Quadrimaera quadrimana (Dana, 1853)，其雄性第二颚足有明显的掌节，具三个凹陷。从大阪府潮间带采集到的新物种Quadrimaera setibasis sp. nov.，其第6步足基部有刚毛，类似于Quadrimaera schellenbergi (Ruffo 1938)，但第5和7步足基部没有刚毛。提供了世界上Austromaera属物种的检索表。
