| Summary: | Emertonia serrata Mathiske & Veit-Köhler sp. nov. http://zoobank.org/ urn:lsid:zoobank.org:act: 5EFC895C-8621-473C-AAF0-164D3A2D0E1B Type material. The examined specimens are registered and deposited in the Senckenberg Forschungsinstitut und Naturmuseum Frankfurt (SMF), Germany. All specimens were collected in the Atlantic Ocean and in the Atlantic and Indian Ocean sector of the Southern Ocean. Station numbers indicate “Expedition, station number (plus - deployment number for SYSTCO and DIVA- 1), depth, core number, sediment horizon”. Female holotype, SMF 37235 (adult female on 1 slide): RV Polarstern PS 71 — SYSTCO, St. 85-7, 2,964 m, MUC8, 0–1 cm. Male allotype, SMF 37236 (adult male on 1 slide): RV Meteor 48/1 — DIVA-1, St. 346-7, 5,389 m, R7, 0–1 cm. Female paratype 1, SMF 37237 (adult female on 8 slides): RV Polarstern PS 71 — SYSTCO, St. 85-7, 2,964 m, MUC8, 0–1 cm. Male paratype 2, SMF 37238 (adult male on 3 slides): RRS Discovery 226—PAP, St. 13077#24, 4,844 m, 0–1 cm. Etymology. The species name refers to the conspicuous serrations on the spines of the swimming legs P2–P4. Spines of this type are not known from any other species of Paramesochridae. Description of female. Habitus (Fig. 3A, B). Total body length measured from anterior tip of rostrum to posterior margin of anal somite (holotype) 0.22 mm, including caudal rami 0.24 mm. Body cylindrical, slightly depressed dorsoventrally, with prosome slightly wider than urosome. Pores present in small numbers, distributed dorsally and laterally on cephalothorax and most of free somites. Most sensilla visible on cephalothorax, some on third and fourth pedigerous somite. Entire posterior margin of first urosomal somite ornamented with two rows of microspinules. Genital double-somite ornamented with row of micro- and row of spinules on posterior margin. Third urosomite with row of micro- and row of different sized spinules along posterior margin. Fourth urosomite ventrolaterally with same-sized spinules as anterior urosomite. Fourth urosomite with thin, ...
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