A new species of Loimia (Annelida, Terebellidae) from Papua New Guinea, with comments on other species recorded in the region

We describe a new species of Loimia, from shallow waters off Northern Papua New Guinea and comparemorphologically to other species recorded from the region and a key is provided. We provide a Maximumlikelihood tree for species of Loimia for which we have data and it forms a distinct clade from other species.Finally, we discuss characters tha

A new species of Pista Malmgren, 1866 (Polychaeta, Terebellidae) from the north-western Mediterranean Sea

A new species of Terebellidae, Pista colini sp. n., has been identified from the harbour of Banyuls-sur-Mer, north-western Mediterranean Sea. This new species was found in very high densities, exclusively in gravelly sand deposited manually, and was not found in the original source habitat of the gravel. This species is characterized by the colour of the ventral shields with pinkish anterior part and a blood red posterior part in live specimens, a pair of unequal-sized plumose branchiae inserted on segment II and anterior thoracic neuropodia with long-handled uncini. The presence of long-handled uncini even in the smallest specimens constitutes the major difference between Pista colini sp. n. and other Pista species with a single pair of branchiae such as P. lornensis and P. bansei

An Invasive Mussel (Arcuatula senhousia, Benson 1842) Interacts with Resident Biota in Controlling Benthic Ecosystem Functioning

The invasive mussel Arcuatula senhousia has successfully colonized shallow soft sediments worldwide. This filter feeding mussel modifies sedimentary habitats while forming dense populations and efficiently contributes to nutrient cycling. In the present study, the density of A. senhousia was manipulated in intact sediment cores taken within an intertidal Zostera noltei seagrass meadow in Arcachon Bay (French Atlantic coast), where the species currently occurs at levels corresponding to an early invasion stage. It aimed at testing the effects of a future invasion on (1) bioturbation (bioirrigation and sediment mixing) as well as on (2) total benthic solute fluxes across the sediment–water interface. Results showed that increasing densities of A. senhousia clearly enhanced phosphate and ammonium effluxes, but conversely did not significantly affect community bioturbation rates, highlighting the ability of A. senhousia to control nutrient cycling through strong excretion rates with potential important consequences for nutrient cycling and benthic–pelagic coupling at a broader scale. However, it appears that the variability in the different measured solute fluxes were underpinned by different interactions between the manipulated density of A. senhousia and several faunal and/or environmental drivers, therefore underlining the complexity of anticipating the effects of an invasion process on ecosystem functioning within a realistic context

An Invasive Mussel (Arcuatula senhousia, Benson 1842) Interacts with Resident Biota in Controlling Benthic Ecosystem Functioning

The invasive mussel Arcuatula senhousia has successfully colonized shallow soft sediments worldwide. This filter feeding mussel modifies sedimentary habitats while forming dense populations and efficiently contributes to nutrient cycling. In the present study, the density of A. senhousia was manipulated in intact sediment cores taken within an intertidal Zostera noltei seagrass meadow in Arcachon Bay (French Atlantic coast), where the species currently occurs at levels corresponding to an early invasion stage. It aimed at testing the effects of a future invasion on (1) bioturbation (bioirrigation and sediment mixing) as well as on (2) total benthic solute fluxes across the sediment–water interface. Results showed that increasing densities of A. senhousia clearly enhanced phosphate and ammonium effluxes, but conversely did not significantly affect community bioturbation rates, highlighting the ability of A. senhousia to control nutrient cycling through strong excretion rates with potential important consequences for nutrient cycling and benthic–pelagic coupling at a broader scale. However, it appears that the variability in the different measured solute fluxes were underpinned by different interactions between the manipulated density of A. senhousia and several faunal and/or environmental drivers, therefore underlining the complexity of anticipating the effects of an invasion process on ecosystem functioning within a realistic context

Five new species of Terebellides (Annelida, Polychaeta, Trichobranchidae) from Papua New Guinea (Bismarck and Solomon seas)

Five new species of Terebellides are described from coastal and deep waters of Papua New Guinea, using both morphology and molecular tools (for four species). Terebellides elenae n. sp. is characterized by the absence of both a glandular lateral region on TC3 and papillae on margins of the branchial lamellae and by the presence of partially fused branchial lobes with conspicuous fifth lobe and dorsal rounded projections until TC6. Terebellides fauchaldi n. sp. has a very large glandular lateral region on the third thoracic chaetiger (TC3), a fifth branchial lobe and partially fused branchial lobes, and conspicuous dorsal rounded projections on TC2–6. Terebellides madeep n. sp. is characterized by a thin glandular region on TC3 and by four free branchial lobes. Terebellides oculata n. sp. is one of the only two species in the world to have eyespots. Finally, T. papillosa n. sp. has geniculate chaetae on TC6 and TC7 and bears a large number of papillae. A majority-rule consensus tree using the 16S gene and an identification key for all Terebellides species described from the Central Indo-Pacific region are provided

Confirmation of the exotic status of Marphysa victori Lavesque, Daffe, Bonifácio & Hutchings, 2017 (Annelida) in French waters and synonymy of Marphysa bulla Liu, Hutchings & Kupriyanova, 2018

The bait worm Marphysa victori Lavesque, Daffe, Bonifácio & Hutchings, 2017 was originally described from Arcachon Bay, France. In the original description, the authors suggested that it may have been introduced, although definitive evidence was lacking at the time. In this paper, we confirm that M. victori is an exotic species originating from East Asia, probably a native of China or Japan. This species was most likely introduced into Arcachon Bay in the 1970s with non-native oysters Crassostrea gigas Thunberg, 1793. The Asiatic origin of this species is confirmed based on both morphological and molecular evidence. Comparison of the type specimens of M. victori with those of Marphysa bulla Liu, Hutchings & Kupriyanova, 2018 described from the Yellow Sea, China, showed no morphological or molecular differences and therefore the more recently named M. bulla is relegated to a junior synonym. This is the first example of a large-sized errant invertebrate species being introduced with oysters into Arcachon Bay.Initiative d'excellence de l'Université de Bordeau

A mega-cryptic species complex hidden among one of the most common annelids in the North East Atlantic

[Abstract] We investigate mitochondrial (COI, 16S rDNA) and nuclear (ITS2, 28S rDNA) genetic structure of North East Atlantic lineages of Terebellides, a genus of sedentary annelids mainly inhabiting continental shelf and slope sediments. We demonstrate the presence of more than 25 species of which only seven are formally described. Species boundaries are determined with molecular data using a broad range of analytical methods. Many of the new species are common and wide spread, and the majority of the species are found in sympatry with several other species in the complex. Being one of the most regularly encountered annelid taxa in the North East Atlantic, it is more likely to find an undescribed species of Terebellides than a described one.Funding: Financial support was provided by the Norwegian Taxonomy Initiative [http://www.biodiversity.no/Pages/135523] to AN (Cryptic polychaete species in Norwegian waters, knr 49-13, pnr 70184228), to EO, TB and JAK (Polychaetes in Skagerrak, knr 53-09, pnr 70184216), to TB, EO and JAK (Polychaetes in the Norwegian Sea, knr 55-12, pnr 70184227); and by the Swedish Taxonomy Initiative [https://www.artdatabanken.se/en/the-swedish-taxonomy-initiative/] (Polychaete species complexes in Swedish waters, dnr 140/07 1.4 and 166/08 1.4), and Kungliga Fysiografiska sällskapet Nilsson-Ehle donationerna [https://www.fysiografen.se/sv/] to AN; and by the ForBio Research School funded by the Research Council of Norway [https://www.forskningsradet.no/en/Home_page/1177315753906] (project no. 248799) and the Norwegian Taxonomy Initiative (pnr 70184215) and the Ramon y Cajal program (RYC-2016-20799) funded by Spanish Ministerio de Economía, Industria y Competitividad, Agencia Estatal de Investigación, Comunidad Autónoma de las Islas Baleares and the European Social Fund to MC; and by Akvaplan Niva [http://www.akvaplan.niva.no/en/] to AS and JP. Publication fees were covered by NTNU's [https://www.ntnu.no/] Publishing Fund to MC. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Acknowledgments We would like to give our greatest thanks to the staff and crew on all scientific expeditions mentioned in the material and method section. Special thanks to Stefan Agrenius for donating specimen 2045_4 from Byfjorden. We also would like to thank Juan Moreira (Universidad Autónoma de Madrid, Spain) for the line drawings in Fig 2.Norge. Norwegian Taxonomy Initiative; 70184228Norge. Norwegian Taxonomy Initiative; 70184216Norge. Norwegian Taxonomy Initiative; 70184227Norge. Norwegian Taxonomy Initiative; 70184215Sverige. Swedish Taxonomy Initiative; 166/08 1.4Sverige. Swedish Taxonomy Initiative; 140/07 1.4Norge. ForBio Research School; 24879

Recent discovery of Paranthura japonica Richardson, 1909 (Crustacea: Isopod: Paranthuridae) in European marine waters (Arcachon Bay, Bay of Biscay)

The Asiatic isopod Paranthura japonica Richardson, 1909 was collected in 2007 in Arcachon Bay (SW France), where the species occurs in a variety of habitats, both in the intertidal and at shallow depths. This species, native to the Sea of Japan, may have been accidentally introduced in Arcachon Bay with oyster transfers or as fouling on ship hulls

Revision of spaghetti worms (Annelida, Terebellidae sensu lato) from the French coasts

Cette thèse a pour objectif de réviser la taxonomie des espèces françaises d’annélides polychètes appartenant aux cinq familles des Terebellidae sensu lato (Polycirridae, Telothelepodidae, Terebellidae sensu stricto, Thelepodidae et Trichobranchidae). Ces vers spaghetti sont caractérisés par la présence de nombreux tentacules buccaux non rétractables servant à leur nutrition et leur assurant un régime déposivore.Les individus étudiés dans le cadre de cette thèse ont été prélevés lors de différents projets de recherche et d’observation menés par les équipes hébergées dans les stations marines françaises, mais également lors d’échantillonnages spécifiques. Des matériels types, archivés au Museum National d’Histoire Naturelle, ont également été empruntés. Cette étude est au centre du « Spaghetti Project », projet collaboratif impliquant les taxonomistes benthiques des différentes stations marines françaises (RESOMAR, RESeau des Stations et Observatoires MARins).Les eaux côtières françaises sont des zones étudiées depuis plusieurs siècles par les premiers taxinomistes et les écologistes benthiques. Cependant, l’étude de nombreux spécimens de vers spaghetti à l’aide de nouveaux outils, comme la microscopie électronique à balayage ou l’analyses moléculaire, a révélé l’existence de 31 espèces nouvelles pour la science.Ces espèces ont probablement « toujours » été présentes le long des côtes mais mal identifiées pendant des décennies. Plusieurs raisons peuvent expliquer ces lacunes. La première est que ces vers sont extrêmement complexes à identifier car les caractères morphologiques nécessitent des observations pointues et des outils modernes. Deuxièmement, la plupart des espèces européennes ont été décrites aux 18ème et 19ème siècles. Les standards taxonomiques de l’époque étaient très différents, avec des descriptions très brèves et des illustrations (quand elles étaient présentes) de qualité médiocre. De plus, les matériels types étaient rarement déposés dans une collection d’un muséum, et quand ils l’étaient ont malheureusement souvent été endommagés ou perdus, empêchant des comparaisons avec des spécimens nouvellement collectés. Enfin, il y a eu jusque dans les années 1980, une idée largement répandue selon laquelle les espèces de polychètes à large distribution étaient très communes. L’étude de ces espèces soi-disant cosmopolites a révélé l’existence de nombreuses espèces cryptiques dans le monde entier en général, et en France en particulier.The objective of this thesis is to revise the taxonomy of the French species of polychaetes belonging to the five families of Terebellidae sensu lato (Polycirridae, Telothelepodidae, Terebellidae, Thelepodidae and Trichobranchidae). These spaghetti worms are characterised by the presence of multiple non-retractable buccal tentacles used for feeding (deposit feeders).The specimens studied in this thesis were collected during different research and observation programs or specific samplings carried out by scientists in the different French laboratories. Type materials from the Museum National d’Histoire Naturelle were also loaned.This study is at the heart of the “Spaghetti Project”, project involving benthic taxonomists from French marine stations (RESOMAR network).French coastal waters are well-known areas, studied for several centuries by early taxonomists and benthic ecologists. However, studying numerous spaghetti worms with new tools, like scanning electron microscope and molecular analysis, has revealed the existence of 31 species new for science.These species have probably “always” been present along the French coasts but misidentified for decades. Several reasons can explain this situation. First, these worms are relatively challenging to identify because of diagnostic characters requiring detailed examination and modern tools. Secondly, most of the European species were described in the 18 and 19th centuries. Taxonomic standards at that time were very different with very brief descriptions and illustrations (when present) of poor quality. Moreover, type material was rarely deposited in a museum collection, and when deposited subsequently often lost or damaged, preventing any comparison with specimens newly collected. Finally, until 1980s, there was a wide perception that widespread species were very common among polychaetes. Studying these so-called “cosmopolitan” species in detail reveals the existence of numerous cryptic species in different parts of the world, in France in particular

Chaetozone

Key to 12 <i>Chaetozone</i> species from the North Atlantic Ocean <p> (Note: Recent published descriptions of <i>Chaetozone caputesocis</i> and <i>C. zetlandica</i> do not fully agree with the definition of <i>Chaetozone</i> and are not included in the following key; MG = Methyl Green).</p> <p>1 Anterior body with distinctly enlarged fusiform segments anterior to abdominal segments............................2</p> <p>- Anterior body segments only slightly enlarged, gradually tapering posteriorly......................................3</p> <p> 2 Anterior body segments enlarged dorsally into hump-backed configuration; peristomium not divided into rings, dorsal tentacles arising from posterior margin of peristomium; posterior parapodia with partial cinctures, up to 8 spines on a side; MG pattern not tested................................................................................. <i>C. gibber</i></p> <p> - Anterior segments enlarged forming distinct fusiform shape; peristomium with two distinct rings, dorsal tentacles arising from smaller second peristomial ring; posterior parapodia with complete cinctures, up to 16 spines on a side; elaborate MG staining pattern throughout body.................................................................... <i>C. elakata</i> <b>n. sp</b>.</p> <p>3 First complete body segment asetigerous; first branchiae on asetigerous segment; eyes absent; long natatory-like capillaries present or absent...................................................................................... 4</p> <p>- First complete body segment setigerous; first branchiae either on posterior margin of peristomium or setiger 1; eyes present or absent; long natatory-like capillaries absent.................................................................7</p> <p> 4 Peristomium with dorsal crest; dorsal tentacles in notch between peristomium and setiger 1; long natatory-like setae on all segments from setigers 18–21; deep groove present along venter; MG stains peristomial area, stripes on anterior thoracic segments, and posterior cinctured segment.............................................................. <i>C. setosa</i></p> <p>- Peristomium without dorsal crest; dorsal tentacles arising from posterior margin of peristomium; long natatory setae present or absent; ventral groove present or absent; MG pattern present or absent...........................................5</p> <p>5 Body pigmented; neuropodial spines first present from anterior one-third of body (setigers 5–25 in 80-setiger specimens); long natatory-like capillaries present on sexually matures specimens or absent; MG pattern present or absent.................6</p> <p> - Body not pigmented; neuropodial spines from mid-body, setiger 25 in 50-setiger specimen; long natatory setae from setiger 2 to about setiger 25; MG pattern not tested........................................................... <i>C. jubata</i></p> <p> 6 Body heavily pigmented with numerous brown to black pigment speckles over entire body; with a prominent mid-ventral ridge along entire length of body formed of ventromedial bulges on each segment; with weak mid-dorsal groove in middle body segments; neuropodial spines from setigers 5–26; posterior cinctures reduced, with 13‒19 spines on a side; no MG pattern................................................................................................ <i>C. pigmentata</i></p> <p> - Body with anterior segments with diffuse black pigment, not discrete speckles, limited to certain areas of the body, not all over; mid-ventral ridge low, not conspicuous; posterior cinctures well developed, with elevated membranes with 20‒22 spines on a side; with distinct MG staining pattern, with all of prostomium staining except tip and most of peristomium staining, forming “mask” over the head region..................................................................... <i>C. bathyala</i></p> <p>7 First pair of branchiae on setiger 1; eyespots present..........................................................8</p> <p>- First pair of branchiae on posterior margin of peristomium; eyespots present or absent...............................9</p> <p> 8 Peristomium with dorsal crest; neuropodial spines from setiger 6–9; anterior neuro- and notopodial spines short, curved, pointed; posterior spines long, straight, pointed.................................................... <i>C. carpenteri</i></p> <p> - Peristomium without dorsal crest; neuropodial spines from setiger 30; neuro- and notopodial spines, short, curved with blunt tip.......................................................................................... <i>C. christiei</i></p> <p> 9 Peristomium with prominent dorsal crest; prostomial eyespots present; neuropodial acicular spines from setiger 1; notopodial acicular spines from setiger 1–8; prominent MG stain on prostomium and peristomium....................... <i>C. corona</i></p> <p>- Peristomial crest absent; prostomial eyespots absent; neuropodial and notopodial spines from middle and posterior segments....................................................................................................10</p> <p> 10 Bidentate hooks and acicular spines in posterior cinctures............................................. <i>C. diodonta</i></p> <p>- Bidentate hooks absent................................................................................ 11</p> <p> 11 Acicular spines with sharp tips curving back and fusing with shaft, from posterior one-third (setigers 50–55 in neuropodia and 45–50 in notopodia); cinctures with 16–24 spines on a side; MG stains prostomium......................... <i>C. anasima</i></p> <p> - Acicular spines short, straight, thick with blunt tips, from mid-body (setigers 40–45 in neuropodia and 45–50 in notopodia); cinctures with 12–14 spines on a side; no MG pattern............................................... <i>C. hystricosa</i></p>Published as part of <i>Lavesque, Nicolas, 2017, A new species of Chaetozone (Polychaeta, Cirratulidae) from the Bay of Biscay offshore France, together with a review of Chaetozone species from the North Atlantic and adjacent waters, pp. 565-579 in Zootaxa 4312 (3)</i> on pages 572-573, DOI: 10.11646/zootaxa.4312.3.10, <a href="http://zenodo.org/record/855617">http://zenodo.org/record/855617</a&gt