A new lacustrine ricefish from central Sulawesi, with a redescription of Oryzias marmoratus (Teleostei: Adrianichthyidae)
A new lacustrine ricefish from central Sulawesi, with a redescription of Oryzias marmoratus (Teleostei: Adrianichthyidae)
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DOI：
10.1007/s10228-023-00908-2
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发表时间：
2023-03
影响因子：
1.2
通讯作者：
Hirozumi Kobayashi;D. Mokodongan;Mizuki Horoiwa;Shingo Fujimoto;Rieko Tanaka;K. Masengi;K. Yamahira
中科院分区：
文献类型：
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作者：
Hirozumi Kobayashi;D. Mokodongan;Mizuki Horoiwa;Shingo Fujimoto;Rieko Tanaka;K. Masengi;K. Yamahira
Oryzias loxolepis 是一个新种，发现于印度尼西亚苏拉威西岛中部马利利湖水系的托乌提湖。历史上，这个新物种一直与 Oryzias marmoratus (Aurich 1935) 混淆，我们重新描述了它。虽然这两个物种在灰棕色的树干上都有深棕色的斑点，但 O. loxolepis 不同于 O. Marmoratusin 具有 11 块腹椎骨、12 或 13 个横鳞、较短的尾柄、末端的嘴、颈项凹度减小、倾斜的躯干鳞片和圆形的雄性背鳍。Oryzias loxolepiscan 也可以与 Oryzias profundicolaKottelat 1990 区分开来，Oryzias profundicolaKottelat 1990 是托乌提湖的另一种同域同源物，其口鼻部较长无论性别，雄性都有较大的头部和眼睛，以及黑边背鳍，而雌性则在肛鳍和背鳍起点处具有较浅的身体深度。基于全基因组单核苷酸变异的系统发育分析揭示了O。 loxolepisto 也是一个姐妹分类单元。深部而不是O。马尔莫拉图斯。在之前的遗传学研究中历史上被称为“O. marmoratus”的标本的身份被重新评估。
Oryzias loxolepis, new species, is described from Lake Towuti in the Malili Lake system, central Sulawesi, Indonesia. Historically this new species has been confused withOryzias marmoratus(Aurich 1935), which we redescribe. While both species share dark brown blotches on a grayish-brown trunk,O. loxolepisdiffers fromO. marmoratusin having 11 abdominal vertebrae, 12 or 13 transverse scales, a shorter caudal peduncle, terminal mouth, reduced nuchal concavity, slanted trunk scales, and a rounded male dorsal fin.Oryzias loxolepiscan be also distinguished fromOryzias profundicolaKottelat 1990, another sympatric congener in Lake Towuti, in having a longer snout in both sexes, in males in having a larger head and eyes, and a black margined dorsal fin, and in females in having a shallower body depth at the anal- and dorsal-fin origins. A phylogenetic analysis based on genome-wide single nucleotide variants revealsO. loxolepisto be a sister taxon toO. profundicolarather thanO. marmoratus. The identities of specimens historically referred to “O. marmoratus” in previous genetic studies are re-evaluated.