Rocinella murilloi Brusca and Iverson, 1985

Rocinella murilloi Brusca and Iverson, 1985

( Figs. 1–4 View Figure 1 View Figure 2 View Figure 3 View Figure 4 )

Rocinella murilloi Brusca and Iverson, 1985: 44 , fig. 14 a–j.— Brusca and France, 1992: 258, figs. 1A–B, 2, 4A, 5H, 15–17. — Espinosa-Pérez and Hendrickx, 2001, 47 (list). — Hendrickx, 2008: 1260.

Material examined. TALUD VIII,St.20 (25º56’56”N 110º43’W), Apr 19, 2005, 1 spec. (TL 14.1 mm), BS, 700–750 m (ICML-EMU-9971) GoogleMaps .

TALUD X, St. 9 (27º52’51”N 112º15’53”W), Feb 10, 2007, 1 spec. (TL 18.5 mm), BS, 1205–1215 m (ICML-EMU-9969) GoogleMaps .

TALUD XII.St.13 (17°45’16”N 102°0’29”W), Mar 30, 2008, 1 spec. (TL 34.5 mm), BS, 1198 m (ICML- EMU-10630-A); St. 23 (18º33’43”N 103º57’45”W), Abr 1, 2008, 50 spec. (TL 25.4–34.4 mm), BS, 1058– 1088 m (ICML-EMU-9973); St. 27 (18º40’28”N 104º35’51”W), Abr 2, 2008, 4 spec. (TL 16.2–34.8 mm), BS, 1040–1095 m (ICML-EMU-9972); St. 28 (18º50’19”N 104º34’14”W), Apr 2, 2008, 1 spec. (TL 33.7 mm), BS, 1101–1106 m (ICML-EMU-9970) GoogleMaps .

TALUD XV. St. 1 (23°18’ 40”N 111°19’ 37”W), Aug 4, 2012, 4 spec. (TL 11.9–14.1 mm), BS, 750– 850 m (ICML-EMU-10630-B); St. 5C (23º16’42”N 110º54’55”W), Aug 5, 2012, 4 spec. (TL 25.8–34.7 mm), BS, 980–1036 m (ICML-EMU-10632-A); St. 5E (23º05’22”N 110º27’54”W), Aug 5, 2012, 1 spec. (TL 34.8 mm), BS, 948–954 m (ICML-EMU-10630-C); St. 8 (24º54’48”N 112º38’06”W), Jul 30, 2012, 1 spec. (TL 33.3 mm), BS, 1212–1235m (ICML- EMU-10631-B); St. 24 (27°5’42”N 114°35’30”W), Aug 1, 2012, 1 spec. (TL 32.1 mm), BS, 772–786 m (ICML-EMU-10631-A) GoogleMaps .

TALUD XVI-B, St. 5 (28º48’6”N 115º24’6”W), May 24, 2014, 1 spec. (TL 31.6 mm), BS, 772–776 m (ICML-EMU-10632-B) GoogleMaps .

Taxonomic remarks. The material examined fits well with the original description of the body of Rocinela murilloi by Brusca and Iverson (1985) and Brusca and France (1992): cephalon about twice as wide as long; eyes large, dark, widely separated; antenna 1 short, antenna 2 extending to pereonite III; pereonite I the longest; coxae of pereonites V–VII extending posteriorly; pleotelson with a pair of submedian pits ( Fig. 1 View Figure 1 ). The original description ( Brusca and Iverson, 1985) also included illustrations of the pereopods I, IV and VII, the maxilliped, the pleopods 1–5, and a dorsal view of the female holotype. Brusca and France (1992) completed the illustration series by adding drawings of the frontal margin of the carapace (ventral view), the mandible, the maxillule, the maxilla, the pereopod III, and the uropod (all from the holotype). SEM photographs of selected appendages and of the frontal portion of the carapace of R. murilloi ( Figs. 2–4 View Figure 2 View Figure 3 View Figure 4 ) are provided here for the first time. The shape and ornamentation of pereopods I–III of the material examined ( Fig. 2A, D, G View Figure 2 ) perfectly match the illustrations and descriptions provided by Brusca and Iverson (1985) and Brusca and France (1992), with the inferior margin of the propodus featuring a distally expanded, broadly-rounded lobe, with 5-5-5 (pereopods I-II-III) stout, recurved spines ( Fig. 2B, E, H View Figure 2 ). In the pereopod I, the carpus has one stout spine ( Fig. 2C View Figure 2 ), and the merus features 2 distal spines ( Fig. 2C View Figure 2 ) and 1 subbasal, shorter spine. Pereopod II (not described previously) ( Fig. 2D–F View Figure 2 ) is similar to pereopod I but with two stout spines on the carpus ( Fig. 2F View Figure 2 ). The merus of pereopod III ( Fig. 2G, I View Figure 2 ) has 3 long, distal stout spines, decreasing in length towards the proximal margin, and one shorter, proximal spine.

The mandible of the examined material ( Fig. 3A–F View Figure 3 ) also closely matches the description and illustrations provided by Brusca and France (1992), with a 3-articulated palp ( Fig. 3A, B View Figure 3 ), the second article about twice as long as first, and with a distal row of about 10 serrate spines and 2 distal, single setae ( Fig. 3B View Figure 3 ); the strongly projecting linguiform molar process ( Fig. 3C View Figure 3 ) also matches the description, and is covered by regularly spaced rows of minute spines ( Fig. 3D View Figure 3 ); the claw-like incisor is spoon-like, ending in a rather sharp tip ( Fig. 3E View Figure 3 ), and the lobe between the molar process and the incisor (the lamina mobilis of Brusca and France, 1992) seems to be an isolated process surrounded by a field of numerous, sharp spinules ( Fig. 3F View Figure 3 ).

Brusca and France (1992) also provided an illustration and a SEM photograph of the ventral view of the frontal part of R. murilloi carapace, with a narrow, arrowhead shape frontal lamina that perfectly matches the material examined ( Fig. 4A View Figure 4 ).

The surface of the pereopods I–III articles is covered by minute scales ( Fig. 4B, C View Figure 4 ), not illustrated previously.