| Summary: | Mauretanaspis longichaeta gen. et spec. nov. urn:lsid:zoobank.org:act: AA378791-074B-4349-B2E2-235FD632E35C Figs 1–4, Table 1 Etymology The species epithet is a combination of the Latin ‘ longus ’ (= ‘long’) and the Greek ‘ chaeta ’ (= ‘bristle’) characterizing the striking length of the posteriormost lateral chaetae of the ventro-caudal shield. Material examined Holotype NORTHEAST ATLANTIC – Off Mauritania • 1 complete specimen (body slightly contracted, introvert fully everted, length 5.0 mm, width 1.6 mm, abdomen length 3.0 mm, left shield plate length 1.2 mm, width 0.9 mm); Block C9, stn C9-15 (B3); 18°21.27′ N, 17°57.44′ W; depth 2712 m; 24 Oct. 2018; deepsea mud, box core; MNHN-IA-TYPE 2005. Paratype NORTHEAST ATLANTIC – Off Mauritania • 1 complete specimen (introvert partly retracted, length 3.5 mm, width 1.8 mm, abdomen length 1.0 mm, left shield plate length 1.2 mm, width 1.2 mm); Block C9, stn C9-15 (B1); 18°21.27′ N, 17°57.44′ W; depth 2712 m; 24 Oct. 2018; deep-sea mud, box core; SMF 27777. Other material NORTHEAST ATLANTIC – Off Mauritania • 1 spec. (bad condition, anterior end retracted, length n.d., width 2.6 mm, abdomen length 3.7 mm, left shield plate length 1.6 mm, width 1.0 mm); Block C9, stn C9-20 (B1); 18°26.91′ N, 17°59.25′ W; depth 2714 m; 27 Oct. 2018; deep-sea mud, box core; SMF 27776. SOUTHEAST ATLANTIC – Off Angola • 1 spec. (juvenile with capillary chaetae in pre-shield segments, without gonopodial lobes, anterior end missing, length n.d., width 0.35 mm); stn S48-03A; 6°53.107′ S, 10°30.762′ E; depth 2935 m; 7 Sep. 2018; box core; MNHN-IA-PNT 120 • 1 spec. (juvenile, anterior end damaged, length n.d., width 0.65 mm, left shield plate length 0.5 mm); stn S48-08A; 6°59.047′ S, 10°36.748′ E; depth 2736 m; 9 Sep. 2018; box core; SMF 28061 • 1 spec. (gonopodial lobes present, length 3.2 mm, width 1.1 mm, left shield plate length 1.1 mm); stn S48-09C; 7°4.931′ S, 10°13.003′ E; depth 4373 m; 14 Sep. 2018; box core; SMF 28062 • 1 spec. (juvenile, body wall translucent, with chaetae in some ...
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