Diversification of filter-feeding nudibranchs: two remarkable new species of Melibe (Opisthobranchia: Tethyiidae) from the tropical western Pacific
Diversification of filter-feeding nudibranchs: two remarkable new species of Melibe (Opisthobranchia: Tethyiidae) from the tropical western Pacific
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DOI：
10.1080/14772000.2012.717551
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发表时间：
2012-01-01
影响因子：
1.9
通讯作者：
Pola, Marta
中科院分区：
文献类型：
--
作者：
Gosliner, Terrence;Pola, Marta
描述了来自热带西太平洋的两种新属。Melibe colemani sp. 11 .产于马来西亚婆罗洲东北部。这个物种是透明的，全身可见一系列白色的相互连接的消化腺管。它的另一个特征是有弱齿颚，高度分叉的消化腺轨迹延伸到全身，生殖系统有一个外部结节状阴道腺和一个顶端弯曲的阴茎。来自菲律宾和马来西亚的Melibe coralophilia sp. nov.具有深金棕色。体宽，密被结核覆盖，结核形成中背脊，覆盖“角”的表面。在内部，本种有巨大的肌质颊部，下颌边缘有细齿，中枢神经系统有结节状神经节和一个扩大的圆形半乳托。Melibe coralophilia与硬核珊瑚Porites sp.和蓝珊瑚Heliopora coerulea有关，尽管这种联系的性质尚不清楚。这一物种的另一个不寻常之处在于，卵团携带在身体的右侧，位于生殖心房的后部，在地幔和脚之间。形态学系统发育表明M. colemani与M. engeli Risbec（1937）、M. digitata Gosliner & Smith（2003）和M. tuberculata Gosliner & Smith（2003）亲缘关系最为密切。Melibe coralophilia是Melibe物种的印度太平洋分支的成员，但它与其他分类群的关系仍未解决。初步的分子数据表明，Melibe物种之间的关系更为复杂，但强烈支持所有被研究的物种代表不同谱系的观点。结合分子数据证实了Tethys与Melibe的姐妹群关系，分子系统发育支持Melibe与Tethyiidae的单系性。
Two new species of the genus Melibe are described from the tropical western Pacific. Melibe colemani sp. nov. is described from northeastern Borneo, Malaysia. This species is transparent with a series of white interconnecting digestive gland ducts visible throughout the body. It is also characterized by having weakly denticulate jaws, highly ramified digestive gland tracks that extend throughout the body, and a reproductive system with an external nodular vaginal gland and a penis with a curved apex. Melibe coralophilia sp. nov., described from the Philippines and Malaysia, has a deep golden brown colour. The body is wide and densely covered with tubercles that form a mid-dorsal crest and cover the surface of the 'cerata'. Internally, this species has a massive muscular buccal mass, jaws with a finely denticulate margin, tuberculate ganglia in the central nervous system and an expanded, rounded receptaculum seminis. Melibe coralophilia is associated with the scleractinean coral Porites sp. and the blue coral Heliopora coerulea although the nature of this association remains unknown. This species is also unusual in that the egg mass is carried on the right side of the body located posterior to the genital atrium and is found between the mantle and the foot. A morphological phylogeny suggests that M. colemani is most closely related to M. engeli Risbec, 1937, M. digitata Gosliner & Smith, 2003 and M. tuberculata Gosliner & Smith, 2003. Melibe coralophilia is a member of the Indo-Pacific clade of Melibe species, but its relationship to other taxa remains unresolved. Preliminary molecular data suggest a more complex relationship between Melibe species, but strongly support the notion that all of the species examined represent distinct lineages. The sister-group relationship of Tethys with Melibe is confirmed and the molecular phylogeny supports the monophyly of Melibe and Tethyiidae based on the combined molecular dataset.