Published December 3, 2025
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Two new species of Hyalonema (Hexactinellida, Amphidiscosida, Hyalonematidae) from the Indo-West Pacific
Authors/Creators
- 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China|University of Chinese Academy of Sciences, Beijing, China
- 2. Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia
- 3. Qingdao National Laboratory for Marine Science and Technology, Qingdao, China|Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China|University of Chinese Academy of Sciences, Beijing, China
- 4. National University of Singapore, Singapore, Singapore
Description
This study describes two new species collected from deep-sea environments in the Indo-West Pacific. Hyalonema (Cyliconema) dexiangi sp. nov., collected from the Indian Ocean, is characterized by distinctive finger-like protuberances on the body surface, the presence of choanosomal pentactins, the co-occurrence of micropentactins and microhexactins, and the absence of mesamphidiscs. Hyalonema (Cyliconema) subconica sp. nov., sampled from a seamount in the western Pacific Ocean, is distinguished by the presence of pinular diactins, a unique combination of choanosomal spicules (diactins, pentactins, and hexactins), and the presence of basalia bearing two-toothed anchors. In addition to their morphological distinctions, molecular phylogenetic analyses based on 16S rDNA sequences indicate a close genetic relationship between the two species.
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