| Summary: | Macrinella lavradoae sp. nov. urn:lsid:zoobank.org:act: 74E71132-4585-49FD-8773-CD1F739E7872 Figs 1, 4–5 Diagnosis (based on female) Pereonites with convex lateral edges. Pleon narrower than pereon. Pleotelson pentagonal, with rounded projection at the posterior edge. Antennule 0.6 times longer than carapace. All pereopods with coxae present. Pereopods 1–3 merus with short seta, not reaching carpus proximal edge. Pereopods 2–3 propodus with one penicillate terminal setae. Pleopods absent. Uropod exopod uniarticulate; endopod robust, with two articles. Etymology The new species is named in honour of Dr Helena Passeri Lavrado (IB/UFRJ) in recognition of her incentive and encouragement to the first author to initiate taxonomic studies on tanaidaceans. Moreover, she coordinates the subproject MABIREH and is a member of the committee board of the Instituto Nacional de Ciência e Tecnologia Antártico de Pesquisas Ambientais (INCT-APA). Material examined Holotype ANTARCTICA: ♀, dissected, adult non-ovigerous, length 1.9 mm, Bransfield Strait, station #3, 62º17′26.4″ S, 58º19′49.5″ W, 1.153 m, 5 Dec. 2009 (MNRJ 24445). Description BODY (Fig. 4). About eight times as long as wide (broken in the pereonite 4). Cephalothorax oval, about 1.3 times as long as wide; eyelobes absent. All pereonites with convex lateral edges. Pereonite 1 shortest, 0.8 times longer than wide. Pereonites 2 and 3 longest, about as long as wide. Pereonite 5 slightly longer than pereonite 6, both about as long as wide. Pleon (Fig. 4) short, about 19% of body length, narrower than pereon. All pleonites sub-equal in size, wider than long. Pleonite 5 with lateral simple seta. Pleotelson pentagonal, slightly wider than long, with rounded projection at the posterior edge and with one pair of lateral and two pairs of terminal simple setae. ANTENNULE (Fig. 4). With four articles, shorter than cephalothorax (about 0.6 times as long as carapace). Article 1 longest, about 1.8 times as long as wide, with one simple and five penicillate inner distal setae. ...
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