Two new deep-water species of Ampharetidae (Annelida: Polychaeta) from the eastern Australian continental margin

Gunton, Laetitia M.; Kupriyanova, Elena K.; Alvestad, Tom

doi:10.3853/j.2201-4349.72.2020.1763

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…Phylogenetic topologies reveal sister group relationships between both species of Ramisyllis, with a clear divergence in COI and 16S (which show faster mutations rates than the nuclear 18S and 28S). The very high COI distances between both species of Ramisyllis agree with previous studies delimitating species in syllids and annelids in general (Aguado et al, 2019;Álvarez-Campos et al, 2017;Kvist, 2016;Lobo et al, 2016;Nygren et al, 2018), as well as those found for the 16S (Bastrop et al, 1998;Gunton et al, 2020;Miglietta et al, 2010;Radashevsky et al, 2016) and ITS2 markers (Vivien et al, 2015). Conversely, the 28S distance was 1 order of magnitude lower but still significant since this is a slow evolving gene and the obtained distances were similar to those among other syllids (Aguado et al, 2019).…”

Section: Ramisyllis Kingghidorahi a New Branching Speciessupporting

confidence: 89%

Ramisyllis kingghidorahi n. sp., a new branching annelid from Japan

Aguado

Ponz‐Segrelles

Glasby³

et al. 2022

Org Divers Evol

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Among over 20,000 species of Annelida, only two branching species with a highly modified body-pattern are known until now: the Syllidae Syllis ramosa McIntosh, 1879, and Ramisyllis multicaudata Glasby et al. (Zoological Journal of the Linnean Society, 164, 481–497, 2012). Both have unusual ramified bodies with one head and multiple branches and live inside the canals of host sponges. Using an integrative approach (combining morphology, internal anatomy, ecology, phylogeny, genetic divergence, and the complete mitochondrial genome), we describe a new branching species from Japan, Ramisyllis kingghidorahi n. sp., inhabiting an undescribed species of Petrosia (Porifera: Demospongiae) from shallow waters. We compare the new species with its closest relative, R. multicaudata; emend the diagnosis of Ramisyllis; and discuss previous reports of S. ramosa. This study suggests a much higher diversity of branching syllids than currently known. Finally, we discuss possible explanations for the feeding behaviour in the new species in relation to its highly ciliated wall of the digestive tubes (especially at the distal branches and anus), and provide a hypothesis for the evolution of branching body patterns as the result of an adaptation to the host sponge labyrinthic canal system.

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Section: Ramisyllis Kingghidorahi a New Branching Speciessupporting

confidence: 89%

Ramisyllis kingghidorahi n. sp., a new branching annelid from Japan

Aguado

Ponz‐Segrelles

Glasby³

et al. 2022

Org Divers Evol

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The lower bathyal and abyssal seafloor fauna of eastern Australia

et al. 2020

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Background Our knowledge of the benthic fauna at lower bathyal to abyssal (LBA, > 2000 m) depths off Eastern Australia was very limited with only a few samples having been collected from these habitats over the last 150 years. In May–June 2017, the IN2017_V03 expedition of the RV Investigator sampled LBA benthic communities along the lower slope and abyss of Australia’s eastern margin from off mid-Tasmania (42°S) to the Coral Sea (23°S), with particular emphasis on describing and analysing patterns of biodiversity that occur within a newly declared network of offshore marine parks. Methods The study design was to deploy a 4 m (metal) beam trawl and Brenke sled to collect samples on soft sediment substrata at the target seafloor depths of 2500 and 4000 m at every 1.5 degrees of latitude along the western boundary of the Tasman Sea from 42° to 23°S, traversing seven Australian Marine Parks. Results The biological sampling included 35 beam trawls, 28 Brenke sleds, 8 box cores, 20 surface meso-zooplankton tows, and 7 Deep Towed Camera transects. In total, 25,710 specimens were identified to 1084 taxonomic entities, including 847 species-level, 144 genus-level and 69 family-level and 24 higher-level taxa. Of the species-level taxa, only 457 were assigned species-level taxonomic names, which implies that up to 58% of the collected fauna is undescribed. In addition, the ranges of numerous species have been extended to include the western Tasman Sea. Conclusions The lower bathyal and abyssal fauna of soft sediment seafloors off eastern Australia has been systematically surveyed for the first time. The resultant collections will provide the foundation for much future ecological, biogeographical, phylogenetic and taxonomic research.

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Annelids of the eastern Australian abyss collected by the 2017 RV ‘Investigator’ voyage

Gunton¹,

Kupriyanova²,

Alvestad³

et al. 2021

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In Australia, the deep-water (bathyal and abyssal) benthic invertebrate fauna is poorly known in comparison with that of shallow (subtidal and shelf) habitats. Benthic fauna from the deep eastern Australian margin was sampled systematically for the first time during 2017 RV ‘Investigator’ voyage ‘Sampling the Abyss’. Box core, Brenke sledge, and beam trawl samples were collected at one-degree intervals from Tasmania, 42°S, to southern Queensland, 24°S, from 900 to 4800 m depth. Annelids collected were identified by taxonomic experts on individual families around the world. A complete list of all identified species is presented, accompanied with brief morphological diagnoses, taxonomic remarks, and colour images. A total of more than 6000 annelid specimens consisting of 50 families (47 Polychaeta, one Echiura, two Sipuncula) and 214 species were recovered. Twenty-seven species were given valid names, 45 were assigned the qualifier cf., 87 the qualifier sp., and 55 species were considered new to science. Geographical ranges of 16 morphospecies extended along the eastern Australian margin to the Great Australian Bight, South Australia; however, these ranges need to be confirmed with genetic data. This work providing critical baseline biodiversity data on an important group of benthic invertebrates from a virtually unknown region of the world’s ocean will act as a springboard for future taxonomic and biogeographic studies in the area.

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Two new deep-water species of Ampharetidae (Annelida: Polychaeta) from the eastern Australian continental margin

Cited by 3 publications

References 34 publications

Ramisyllis kingghidorahi n. sp., a new branching annelid from Japan

Ramisyllis kingghidorahi n. sp., a new branching annelid from Japan

The lower bathyal and abyssal seafloor fauna of eastern Australia

Annelids of the eastern Australian abyss collected by the 2017 RV ‘Investigator’ voyage

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