Lysmata lipkei Okuno & Fiedler, 2010

Alves, Douglas Fernandes Rodrigues, Lima, Daniel José Marcondes, Hirose, Gustavo Luis, Martinez, Pablo Ariel, Dolabella, Silvio Santana & Barros-Alves, Samara De Paiva, 2018, Morphological and molecular analyses confirm the occurrence of two sympatric Lysmata shrimp (Crustacea, Decapoda) in the southwestern Atlantic, Zootaxa 4526 (1), pp. 41-55 : 45-46

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 .

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 ).

Figures

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.

FIGURE 2. Lysmata lipkei Okuno & Fiedler, 2010. (A) frontal region, dorsal; (B) frontal region, lateral; (C) left antennule; (D) left second pereiopod; (E) right second pereiopod; (F) right fourth pereiopod; (G) right dactylus of the fourth pereiopod. (A–C, F–G) Hermaphrodite shrimp 3.7 mm CL (MZUSP 37416); (D–E) Hermaphrodite shrimp 4.0 mm CL (MZUSP 37513). Scale bars: A–B, 1.0 mm; C–G, 0.5 mm.