Ariyama Hiroyuki
Osaka Museum of Natural History, Nagai Park, Higashi-Sumiyoshi, Osaka 546-0034 Japan..
Zootaxa. 2020 Feb 27;4743(4):zootaxa.4743.4.1. doi: 10.11646/zootaxa.4743.4.1.
Two species of Maera Leach, 1814, a species of Meximaera Barnard, 1969 and a species of Orientomaera Ariyama, 2018 included in the Maera clade, are described from Japan. Maera loveni (Bruzelius, 1859) was collected from the Sea of Japan and can be distinguished from its congeners by the very large body size and the gnathopod 2 palm defined by a blunt tooth bearing a strong robust seta. Maera sagamiensis sp. nov. from Sagami Bay is characterized by the presence of small notches on the coxae 1-3. Meximaera mooreana (Myers, 1989) was collected from Wakayama Prefecture and has two distinct characters: the male gnathopod 2 with wide basis and the very long uropod 3. Morphological characters of the Japanese specimens resemble well those in the literature, but the mandibular palp article 1 is projected acutely. Orientomaera incisa sp. nov. was recently collected from Wakayama Prefecture and its gnathopods 2 in both sexes bear a distinctive incision on the palm. Keys to species of Meximaera in the world and Japanese species of the Maera-clade are provided. Fifteen species included in the Maera-clade occur in Japan.
本文描述了采自日本的隶属于Maera进化枝的1814年命名的Maera Leach属的两个物种、1969年命名的Meximaera Barnard属的一个物种以及2018年命名的Orientomaera Ariyama属的一个物种。Maera loveni (Bruzelius, 1859)采自日本海，可通过其非常大的体型以及由带有强壮刚毛的钝齿所界定的第二颚足掌节与同属其他物种相区分。来自相模湾的新物种Maera sagamiensis的特征是第1 - 3基节上有小缺口。Meximaera mooreana (Myers, 1989)采自和歌山县，具有两个明显特征：雄性第二颚足基部宽阔以及第三尾足非常长。日本标本的形态特征与文献记载的非常相似，但第一下颚须节尖锐突出。新物种Orientomaera incisa最近采自和歌山县，其两性的第二颚足掌节上都有一个独特的切口。文中提供了世界上Meximaera属物种以及Maera进化枝日本物种的检索表。Maera进化枝中有15个物种分布于日本。
