Morphological and molecular analyses confirm the occurrence of two sympatric Lysmata shrimp (Crustacea, Decapoda) in the southwestern Atlantic Author Alves, Douglas Fernandes Rodrigues Author Lima, Daniel José Marcondes Author Hirose, Gustavo Luis Author Martinez, Pablo Ariel Author Dolabella, Silvio Santana Author Barros-Alves, Samara De Paiva text Zootaxa 2018 2018-11-28 4526 1 41 55 journal article 27901 10.11646/zootaxa.4526.1.3 3ca9acbb-9081-42c7-880c-5847a55c42a6 1175-5326 2611393 956F660E-8F02-45EA-8342-3A92566DC3DB Lysmata lipkei Okuno & Fiedler, 2010 ( Figs. 1A , 2 ) Lysmata lipkei Okuno & Fiedler, 2010 : 599 , figs. 1–4. Lysmata lipkei — De Grave et al. 2012 : 97 , fig. 2C; Pachelle et al. 2016 : 17 , figs. 10–12; Anker & De Grave, 2016 : 402 , figs. 66, 68. Material examined . Brazil , Sergipe : 1 hermaphrodite ( MZUSP 37415 ), Aracaju , Orla do Mosqueiro , D.F.R. Alves coll., i.2016 ; 2 hermaphrodites ( MZUSP 37417 ), same collection data, 10.x.2016 ; 5 hermaphrodites ( MZUSP 37416 ), Aracaju , Orla do Sol , D.F.R. Alves coll., 03.iv.2017 ; 1 hermaphrodite ( MZUSP 37513 ), Orla do Mosqueiro , D.F.R. Alves coll., i.2017 . FIGURE 1. Lateral view of (A) Lysmata lipkei Okuno & Fiedler, 2010 and (B) Lysmata vittata (Stimpson, 1860) , from the Vaza-Barris estuary, Sergipe, Brazil. Scale bar: 5.0 mm. Photographs by DFR Alves. Additional material . Brazil , Ceará : 4 hermaphrodites, 1 ovigerous hermaphrodite, MZUSP 33744 , Icapuí , Praia de Ponta Grossa , rocky intertidal, under rocks in tide pools, C.B. Mendes et al . coll., 09.ix.2014 . Rio Grande do Norte : 1 hermaphrodite, MZUSP 29788 , Areia Branca , Praia de Baixa Grande , 04°55’45”S , 37°05’06”W , rocky intertidal, under rocks in tide pools, P.P.G. Pachelle coll., 23.vii.2013 [fcn PP 13-021]; 1 ovigerous hermaphrodite, MZUSP 29789 , same collection data [fcn PP 13-022] . Distribution . Western Pacific and Indo-Pacific: Southern Japan (Ryukyu Islands) and Singapore ( Anker & De Grave 2016 ). Western Atlantic: Brazil ( Ceará , Rio Grande do Norte , and Sergipe ) ( Pachelle et al. 2016 ; present study). Morphological variation. Straight rostrum, reaching the distal margin of the second article of the antennular peduncle ( Fig. 2A,B ). Rostrum with 5–7 dorsal teeth (predominantly 6) and 2–4 ventral teeth (predominantly 3) ( Fig. 2A,B ). Antennular peduncle with one minute spinule on the third article ( Fig. 2C ). Antennular flagellum with short accessory branch, with an unguiform shape ( Fig. 2C ). Ischium of the second pereiopod with clearly visible articles ( Fig. 2D, E ). Merus of the second pereiopod subdivided into 16–25 articles ( Fig. 2D,E ), with an unusual range of variation in L. lipkei (see Table 2 ), and the lowest numbers of articles (16 and 17) recorded in the smallest specimens ( 2.6 mm and 3.6 mm , respectively). Carpus of the second pereiopod subdivided into 26–31 articles ( Fig. 2D,E ). Left second pereiopod longer and larger than the right ( Fig. 2D,E ). Each segment of the left second pereiopod 1.2–1.3 times longer than the respective segment of the right ( Fig. 2D,E ). Merus of the fourth pereiopod with 3–5 spiniform setae ( Fig. 2F ). Dactylus of the fourth pereiopod biunguiculate, with tufts of setae on the terminal margin, armed with 3 spines on the flexor margin ( Fig. 2G ).