深海多鳞虫科的分类学及共生演化研究进展OA北大核心CSCDCSTPCD

The Polynoidae,one of the most diverse families within the order Phyllodocida of the phylum Annelida,comprises more than 160 genera and 20 subfamilies,with approximately 900 species.It represents a dominant component of deep-sea macrobenthic communities,exhibiting remarkable species richness in both chemosynthetic and typical sedimentary environments,with estimates suggesting that up to 50%of collected specimens could rep-resent novel species.Polynoids also engage in widespread symbiotic relationships with corals,sponges,and other marine organisms.Taxonomic studies of the Polynoidae have evolved over a long period.Initially,higher-rank classifications(e.g.,subfamilies and genera)relied heavily on morphological characteristics,which are often sub-jective,with many groups lacking phylogenetic validation.In recent years,molecular phylogeny has enabled the reclassification of certain groups;for instance,the Macellicephalinae subfamily now incorporates several previous-ly distinct subfamilies isolated from the deep sea.However,the monophyly of certain groups,such as the Poly-noinae subfamily,remains uncertain.Therefore,integrating morphological and molecular data is essential to estab-lish a more realistic and robust classification system.Symbiosis,a key ecological trait of polynoids,encompasses a range of interactions,including parasitism,commensalism,and mutualism.These interactions may have driven the co-evolution of polynoids and their hosts,as well as the development of adaptive features(e.g.,hook-shaped chae-tae).Despite their ecological importance,the evolutionary mechanisms underlying such symbiotic relation-ships—including host choice and adaptive radiation—remain poorly understood.As model polychaetes for studying deep-sea adaptability,further phylogenetic and ecological research,supported by comprehensive datasets,is essen-tial to advance our understanding of deep-sea biodiversity and its associated evolutionary processes.