AnimaliaNot EvaluatedacceptedspeciesAccepted

Euphrosinopsis halli

Neal, Wiklund, Gunton, Rabone, Bribiesca-Contreras, Dahlgren & Glover, 2022

GBIF:12248486

0year

PROFILE

Species Profile

Habitat

Marine

Characteristics

Extant

ABOUT

Descriptions(5)

Figs 15 C, 20 A-E, 21 A-E

Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

Diagnosis. Holotype (NHMUK ANEA. 2022.642) complete (except for tissue sampled for DNA), 1.3 mm long and 0.75 mm wide without chaetae for 11 chaetigers. Paratype (NHMUK ANEA. 2022.643) complete (except for tissue sampled for DNA), 1.5 mm long and 0.75 mm wide for 12 chaetigers. Body short, oval, flattened, pale yellow in alcohol (Fig. 20 A). Prostomium longer than wide, with 5 prostomial appendages (Fig. 15 C). Pair of short slender palps; pair of slender lateral antenna; median antenna of caruncle with long thick ceratophore and slender cirrus of similar length to caruncle (Figs 15 C, 20 B). Caruncle as oval lobe reaching to chaetiger 2, mostly free of body wall, with median keel and two pairs of lateral ridges, median keel slightly thicker than the lateral ones (Fig. 20 B). Single pair of large, spherical eyes, deeply embedded, lateral to median antenna and caruncle (Figs 15 C, 20 A). Parapodia biramous, two rami well separated. With parapodial appendages observed dorso-ventrally as follow (Figs 15 F, 20 C): long slender dorsal cirrus, often curved into S-shape in middle chaetigers; single cirriform branchia attached laterally to dorsal cirrus; lateral cirrus similar to branchia in form, but more robust; slender cirriform ventral cirrus. Chaetae fragile, prone to breakage, of two main types: 1. Numerous, bifurcate chaetae arranged in approximately three rows in notopodia; their shafts of various length and thickness (Fig. 21 A); development of filelike teeth on shafts ranging from smooth (Fig. 21 C) to well developed (Fig. 21 D, E); their prongs variable in length with short furcate chaetae in anterior tier having the ratio of short to long prong ranging from 1: 2 - 2.5 (where possible to establish), the prong ratio of longest chaetae in the mid tear ranging from 1: 3.5 - 4 (where possible to establish); prongs mainly smooth or with extremely faint serration only visible under high magnification (Fig. 21 B). 2. Ringent chaetae (sensu Kudenov 1993) present in notopodia only, few in numbers (ca. 5 per notopodium), composed of two curved prongs of unequal length and thickness, both with indistinct serration, the long prong distally with slender elongated tip, short prong broad and distally rounded (Fig. 20 D, E). Neurochaetae similar less numerous, thinner, and shorter than notochaetae, all bifurcate, prongs appearing smooth, often broken off. Pygidium with pair of cirri resembling cylindrical tube feet.

Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

Distribution. Central Pacific Ocean, Eastern CCZ, the exploration areas UK- 1 and NORI-D (Fig. 1).

Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

Etymology. This species is named for Preben Hall, the captain onboard the ship Maersk Launcher that was used in NORI-D expeditions in 2020 and 2021.

Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

Material examined. NHM _ 0779, NHMUK ANEA 2022.641, coll. 20 / 02 / 2015, EBS, 12.53717, - 116.60417, 4425 m, UK- 1, http: // data. nhm. ac. uk / object / 1 a 683870 - d 904 - 4 c 2 c-bf 1 a-a 34 ead 0 a 42 fc; NHM _ 4339 (holotype), NHMUK ANEA 2022.642, coll. 11 / 03 / 2020, box core, 12.17997, - 117.065277, 4117 m, UK- 1, http: // data. nhm. ac. uk / object / 670 dfd 34 - 338 d- 4 edc- 8856 - b 0 a 9 a 728 efc 9; NHM _ 6018 (paratype), NHMUK ANEA 2022.643; coll. 13 / 11 / 2020, box core, 10.35780, - 117.15931, 4284 m, NORI-D, http: // data. nhm. ac. uk / object / ab 26 e 2 ea-ab 87 - 4013 - 8106 - e 817 c 0485 cc 9.

Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

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CLASSIFICATION

Taxonomic Classification Tree

AnimaliaAnnelidaPolychaetaAmphinomidaEuphrosinidaeEuphrosinopsisEuphrosinopsis halli

Animalia2,981,931

Annelida41,152

Polychaeta22,832

Amphinomida367

Euphrosinidae75

Euphrosinopsis5

Euphrosinopsis halli

Related Name Usages(6)

Matching names from other GBIF-indexed checklists and datasets.

Euphrosinopsis halliNeal, Wiklund, Gunton, Rabone, Bribiesca-Contreras, Dahlgren & Glover, 2022

acceptedspecies

Euphrosinopsis halli

acceptedspecies

Euphrosinopsis halliNeal, Wiklund, Gunton, Rabone, Bribiesca-Contreras, Dahlgren & Glover, 2022

acceptedspecies

Euphrosinopsis halliNeal, Wiklund, Gunton, Rabone, Bribiesca Contreras, Dahlgren & Glover, 2022

Neal, Lenka, Helena Wiklund, Laetitia M. Gunton, Muriel Rabone, Guadalupe Bribiesca Contreras, Thomas G. Dahlgren & Adrian G. Glover. 2022. Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida). ZooKeys 1137: 33-74.

acceptedspecies

Euphrosinopsis halliNeal, Wiklund, Gunton, Rabone, Bribiesca-Contreras, Dahlgren & Glover, 2022

acceptedspecies

MULTIMEDIA

Media Files(5)

Figure 1. Map of CCZ of exploration areas and areas of particular interest, with targeted areas where samples of this study were collected highlighted in colours (see legend for explanation).

Imageimage/png© Neal, Lenka;Wiklund, Helena;Gunton, Laetitia M.;Rabone, Muriel;Bribiesca-Contreras, Guadalupe;Dahlgren, Thomas G.;Glover, Adrian G.Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida)

Figure 5. Majority-rule consensus trees from the Bayesian analyses with posterior probability values on nodes. Taxon names highlighted in blue are news species or new sequences for already known species. A Amphinomidae phylogenetic tree using a combined datasets for COI, 16 S, and 18 S with 26 terminal taxa of which Euphrosine foliosa (Euphrosinidae) was used as a root B Euphrosinidae phylogenetic tree using a combined datasets for 16 S and 18 S with nine terminal taxa of which Paramphinome jeffreysii (Amphinomidae) was used as a root.

Figure 15. Diagrammatic representation of prostomial (A-C) and parapodial appendages from mid-body chaetigers (D, E) of CCZ-collected Euphrosinidae species (relative lengths preserved, but not drawn to scale) A Euphrosinella georgievae sp. nov. B Euphrosinopsis ahearni sp. nov. C Euphrosinopsis halli sp. nov. D Euphrosinella georgievae sp. nov. E Euphrosinopsis ahearni sp. nov. F Euphrosinopsis halli sp. nov. Abbreviations: P - palps, La - lateral antennae, Ma - median antenna, Car - caruncle, E - eyes, DC - dorsal cirrus, LC - lateral cirrus, VC - ventral cirrus, Br - branchiae.

Figure 20. Euphrosinopsis halli sp. nov. A preserved holotype NHMUK ANEA. 2022.642, eye spots visible B holotype NHMUK ANEA. 2022.642 stained with Shirlastain, showing caruncle (car) and median antenna (Ma) C specimen NHMUK ANEA. 2022.641 stained with Shirlastain, showing branchiae (Br) and dorsal cirri (Dc) and lateral cirrus (Lc) D, E ringent chaetae from specimen NHMUK ANEA. 2022.641. Scale bars: 500 µm (A, C); 25 µm (D); 50 µm (E). Abbreviations: Ma - median antenna, Car - caruncle, Br - branchiae, Dc - dorsal cirrus, Lc - lateral cirrus.

Figure 21. Euphrosinopsis halli sp. nov. (holotype NHMUK ANEA. 2022.642) A long and short furcate notochaetae B faint serration of long prong (marked by arrow) C smooth shafts of dorsalmost notochaetae D shafts with file-like teeth of middle chaetae E shafts with file-like teeth of ventralmost chaetae. Scale bar: 250 µm.

IMAGES

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CITATIONS

References(1)

Neal, Lenka; Wiklund, Helena; Gunton, Laetitia M.; Rabone, Muriel; Bribiesca-Contreras, Guadalupe; Dahlgren, Thomas G.; Glover, Adrian G. (2022). Abyssal fauna of polymetallic nodule exploration areas, eastern Clarion-Clipperton Zone, central Pacific Ocean: Amphinomidae and Euphrosinidae (Annelida, Amphinomida). <em>ZooKeys.</em> 1137: 33-74.

original descriptionWorld Register of Marine Species