|Larval development of Mooreonuphis stigmatis (Treadwell, 1922) (Polychaeta: Onuphidae) from the north-east Pacific|In: Marine Biology Research. Taylor & Francis: Oslo; Basingstoke. ISSN 1745-1000; e-ISSN 1745-1019, meer
Intertidaal milieu; Juvenielen; Larvale ontwikkeling; Mooreonuphis stigmatis (Treadwell, 1922) [WoRMS]; INE, USA, Washington, San Juan Archipelago; Marien
Chaetal progression; direct development; False Bay; juvenile
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Development of Mooreonuphis stigmatis, one of the dominant polychaete species in the intertidal soft-bottom community in False Bay (San Juan Island, Washington, USA) has been studied from the 5-chaetiger stage to adult utilizing SEM techniques. Clearly lecithotrophic larvae develop inside the parental tubes until at least the 17-chaetiger stage. The earliest observed stage demonstrated reduced trochal ciliation. Description of development of various ciliated sensory organs is provided. Development of prostomial and peristomial appendages is similar to that found in other onuphid larvae. The chaetal progression pattern of larvae is described in detail and a unified terminology for larval and adult chaetae is suggested. Three major chaetal progression patterns in onuphids can be recognized. The phylogenetic status of some character states such as pseudocompound falciger dentition, origin of branchiae and subacicular hooks is discussed.