Abstract
Hyalopomatus cancerum n.sp., epizoic onspider-crabs (Encephaloides) in a low-oxygenarea of the Arabian Sea, differs from other species ofthe genus in lacking opercula.Larger serpulids in Indian Ocean ’Galathea‘ samplesfrom great depths, tentatively referred to Protissimplex Ehlers, mostly bear vesicles on tips ofpinnulate radioles. These are too small to occlude thetube mouth, so perhaps they and the largervascularised vesicles of Apomatus may help inrespiration. The BIOFAR Survey off the Faroe Islandsshowed that Protula (always non-operculate) andApomatus are the main serpulid genera in thedeeper channels. Protis, Protula and Apomatus, which are amongst the best-known ofdeep-sea serpulids, are like early postlarval stagesof Serpula and Hydroides in lackingopercula, or in having thin-walled opercular vesicleson pinnulate stalks. They thus support the view thathypomorphy is somewhat characteristic of abyssal taxa.Considering non-operculate serpulids of shallow seas,many species of Spiraserpula lack opercula, butsecrete sharp ridges and spines on the inner walls oftheir tubes, which must deter or trap predatorytube-invaders; Floriprotis may be protected bycoral, whilst Salmacina, Paraprotula, Microprotula and Paraprotis dendrova Uchidaincubate their embryos, so have special respiratoryneeds.
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Knight-Jones, E.W., Knight-Jones, P., Oliver, P.G. et al. A new species of Hyalopomatus (Serpulidae: Polychaeta) which lacks an operculum: is this an adaptation to low oxygen?. Hydrobiologia 355, 145–151 (1997). https://doi.org/10.1023/A:1003061508634
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DOI: https://doi.org/10.1023/A:1003061508634