Chrysogorgia sp. CCZ_112
Bribiesca-Contreras, Guadalupe, Dahlgren, Thomas G., Amon, Diva J., Cairns, Stephen, Drennan, Regan, Durden, Jennifer M., Eleaume, Marc P., Hosie, Andrew M., Kremenetskaia, Antonina, McQuaid, Kirsty, O'Hara, Timothy D., Rabone, Muriel, Simon-Lledo, Erik, Smith, Craig R., Watling, Les, Wiklund, Helena & Glover, Adrian G., 2022, Benthic megafauna of the western Clarion-Clipperton Zone, Pacific Ocean, ZooKeys 1113, pp. 1-110 : 1
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|Chrysogorgia sp. CCZ_112|
Fig. 16 View Figure 16
Clarion-Clipperton Zone • 1 specimen; APEI 4; 7.2874°N, 149.8578°W; 4125 m deep; 04 Jun. 2018; Smith & Durden leg.; GenBank: ON400711 View Materials (COI), ON406602 View Materials (16S); NHMUK; Voucher code: CCZ_112 GoogleMaps .
Wide, long, sparsely branched colony, ~ 30 cm tall from the base (Fig. 16A, B View Figure 16 ). Polyps constricted basally on the neck (Fig. 16C-E View Figure 16 ), placed on internodes and absent from the main stem (Fig. 16A, B View Figure 16 ). Polyps are light orange when alive (Fig. 16C, D View Figure 16 ) and white after preservation (Fig. 16E View Figure 16 ). Sclerites near the polyp base are scale-like, but throughout the body and along the tentacle rachis are all elongate flat rods; sclerites are absent from the tentacle pinnules.
The sequence for the COI gene is 0% divergent from a sequence of a specimen of Chrysogorgia abludo Pante & Watling, 2011 (specimen NAS102-3, GenBank accession number GQ180138) collected at Nashville Seamount, New England Seamounts at 2246 m depth (Station 102; 34.5828°N, 56.8433°W) included as comparative material during the species description ( Pante and Watling 2011). In octocorals, it has been found that COI evolves very slowly and therefore it is not suitable for species discrimination, with different species having the same haplotype ( McFadden et al. 2011). Chrysogorgia abludo is distributed in the Atlantic Ocean, and morphological characters of the specimen collected in this study differ from the original description of C. abludo , as well as other species within the genus and hence considered a potentially new species In the phylogenetic tree (Fig. 15 View Figure 15 ) the specimen was also recovered along with another specimen of Chrysogorgia , supporting its placement within the genus.
Comparison with image-based catalogue.
No similar Alcyonacea morphotypes have been catalogued so far from seabed imagery in the eastern CCZ or in abyssal areas of the Kiribati EEZ. Consequently, the in situ image of Chrysogorgia sp. CCZ_112 was catalogued as a new morphotype (i.e., Chrysogorgia sp. indet., ALC_017).
The specimen was attached to polymetallic crust on the slope of a seamount in the APEI 4, at 4124 m depth.
Family Mopseidae Gray, 1870
Mopseidae sp. CCZ_088
Fig. 17 View Figure 17
Material. Clarion-Clipperton Zone • 1 specimen; APEI 4; 7.0089°N, 149.9109°W; 5018 m deep; 02 Jun. 2018; Smith & Durden leg.; GenBank: ON400705 (COI), ON406603 (16S); NHMUK XXX; Voucher code: CCZ_088.
Description. Single specimen, with white axis and polyps; polyps standing perpendicular to the axis when alive (Fig. 17A View Figure 17 ). Colony is long, ~ 45 cm tall, and unbranched (Fig. 17A, B View Figure 17 ). Polyps are tall, ~ 2 mm, clavate, and standing parallel to the branch (Fig. 17C View Figure 17 ).
Remarks. Both 16S (0.3% K2P) and COI (0.6% K2) sequences are very similar to Mopseinae sp. NHM_330 ( Dahlgren et al. 2016), which morphologically resembles the genus Primnoisis . The specimen from the western CCZ likely belongs to the same genus but based on genetic and morphological differences represents a different species from that of the eastern CCZ.
Ecology. The specimen was found attached to a nodule in abyssal sediments of APEI 4 at 5018 m depth.
Comparison with image-based catalogue. No similar Alcyonacea morphotypes had been catalogued so far from seabed imagery in the eastern CCZ or in abyssal areas of the Kiribati EEZ. Consequently, the in situ image of CCZ_088 was catalogued as a new morphotype (i.e., Mopseidae gen. indet., ALC_018). However, it is often not possible to determine whether such small and abundant polyps are arranged in pairs or not, or the actual orientation of these with regards to the axis from seabed images.
Family Primnoidae Milne Edwards, 1857
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