Further records of species of Gennadas (Crustacea, Decapoda, Dendrobranchiata, Benthesicymidae) in the Mexican Pacific Author Hendrickx, Michel E. text Zootaxa 2015 3980 3 417 426 journal article 10.11646/zootaxa.3980.3.5 969ad5e9-872c-47ef-b03e-09ebae3db5fe 1175-5326 238377 91FDD496-F465-4CAE-86A5-B7510C63DE53 Gennadas sordidus Kemp, 1910 Gennadas sordidus .— Burkenroad, 1938 : 57 , fig. 1. Hanamura, 1983 : 57 , figs. 4 d–f. Hendrickx & Estrada–Navarrete, 1989: 107 (list); 1996: 34, figs. 9, 19, 22 C. Guzmán & Wicksten, 2000 : 929 . Wicksten, 2002 : 130 ; 2012: 24, fig. 5C, D. Hendrickx, 2005: 161 (list); 2013: 441. Guzmán, 2008 : 29 . Material examined . 183 specimens . TALUD III. St. 13 ( 23º38'30"N 107º58'48"W ), August 18, 1991 , 2 M (CL 7.9–8.3 mm ) and 5 F (CL 6.4–9.9 mm ) (EMU–10877), and 8 juv. (CL 2.9–5.7 mm ), 19 F (CL 5.7–10.9 mm ) and 14 M (CL 3.9–10.4 mm ) (EMU–10878) IK operated between surface and 720 m ; St. 19 ( 25º12'N 109º07'W ), August 20, 1991 , 7 M (CL 5.18–10.0 mm) and 10 F (CL 5.81–8.40 mm ), IK operated between surface and 410 m (total depth: 920 m ) (EMU–9961) (id. J. Flores A.). TALUD IV. St. 15 ( 23º23'30"N 107º47'48"W ), August 24, 2000 , 2 F (CL 7.9–10.2 mm ), MN operated between surface and 1500 m (total depth: 2350 m ) (EMU–10914–A); St. 18 ( 24º15'12"N 108º17'10"W ), August 25, 2000 , 2 M (7.4–9.0 mm) and 3 F (6.5–8.0 mm), BS operated at 908–944 m (EMU–5985–A); St. 19 ( 24º15'18"N 108º24'06"W ), 1 juvenile , BS operated at 1196–1200 m (EMU–5985B); St. 22 (2417'20" N 10850 '30"W), August 26, 2000 , 1 M (CL 7.3 mm ) and 1 F (CL 9.8 mm ), MN operated between surface and 1325 m (EMU–10914–B). TALUD VII. St. 5 ( 22º00'24"N 106º39'54"W ), June 5, 2001 , 1 F (CL 6.5 mm ), BS operated at 1490–1520 m ; St. 19 ( 24º16'12"N 108º23'42"W ), June 7, 2001 , 2 M (CL 8.3–9.1 mm ) and 3 F (CL 7.35–8.30 mm ), BS operated at 1160–1180 m (EMU–6693); St. 20 ( 24º14'48"N 108º35'12"W ), June 7, 2001 , 8 M (CL 7.5–10.5 mm ) and 6 F (CL 7.7–10.2 mm ), BS operated at 1480–1520 m (EMU–5984); St. 27 ( 25º01'30"N 109º12'W ), June 8, 2001 , 2 M (CL 9.3–9.8 mm ) and 4 F (CL 6.5–9.3 mm ), BS operated at 1580–1600 m (EMU–6697); St. 34B ( 26º05'30"N 110º10'30"W ), June 9, 2001 , 2 M (CL 8.0– 8.7 mm ), BS operated at 1500–1520 m . TALUD VIII. St. 13 ( 25º21'N 110º17'W ), April 18, 2005 , 2 F (CL 9.09–9.91 mm ), BS operated at 1625 m (id. J. Flores A.) (EMU–9962); St. 15 ( 25º23'06"N 110º18'06"W ), April 18, 2005 , 2 M (CL 6.8–8.0 mm), BS operated at 1030 m ; St. 16 ( 25º24'48"N 110º34'48"W ), April 18, 2005 , 1 M (CL 9.0 mm) and 1 F (CL 9.0 mm), BS operated at 1030 m ; St. 17B ( 25º24'24"N 110º50'06"W ), April 18, 2005 , 4 F (CL 6.0–10.0 mm), BS operated at 700–750 m ; St. 20 ( 25º56'56"N 110º43'W ), April 19, 2005 , 1 M (CL 8.8 mm ) and 2 F (6.0– 8.9 mm ), BS operated at 1140–1150 m ; St. 21 ( 26º02'18"N 110º37'06"W ), April 19, 2005 , 2 M (8.2–9.0 mm) and 4 F (CL 5.0– 8.9 mm ), BS operated at 1380 m ; St. 22 ( 26º03'42"N 110º23'54"W ), April 19, 2005 , 1 F (CL 9.1 mm ), BS operated at 2200 m . TALUD IX. St. 2 ( 24º38'42"N 109º17'36"W ), November 11, 2005 , 2 F (CL 7.5–8.9 mm ), BS operated at 2195–2300 m (EMU–8241); St. 10 ( 24º56'24"N 110º16'42"W ), November 12, 2005 , 1 M (CL 9.0 mm) and 2 F (CL 6.5–7.0 mm), BS operated at 969–1225 m ; St. 15 ( 25º21'27"N 110º18'18"W ), November 13, 2005 , 3 M (CL 8.1– 9.7 mm ) and 3 F (CL 8.0– 10.5 mm ), BS operated at 1985–2290 m (EMU–8235); St. 16 ( 24º23'48"N 110º36'42"W ), November 13, 2005 , 1 M (CL 10.2 mm ) and 1 F (CL 10.1 mm ), BS operated at 997–1021 m ; St. 17 ( 25º19'54"N 110º47'42"W ), November 13, 2 M and 2 F, BS operated at 626–846 m ; St. 18 ( 25º49'38"N 110º34'45"W ), November 13, 2005 , 2 M (CL 7.0– 9.95 mm ), BS, depth unknown but> 500 m (EMU–9963); St. 20–B ( 25º58'07"N 110º40'04"W ), November 14, 2005 , 1 M (CL 8.5 mm ), BS operated at 1229–1343 m ; St. 21–B ( 26º04'42"N 110º34'48" November 14, 2005 , 1 M (CL 6.8 mm ), BS operated at 1349–1369 m . TALUD X. St. 5 ( 28º14'50"N 112º24'53"W ), February 9, 2007 , 1 damaged specimen (CL ca 8.5 mm ), BS operated at 820–837 m ; St. 8 (28º05'56N 112º26'50"W ) 1 M (CL ca 9 mm ) and 2 F (CL ca. 9 mm ), BS operated at 975–1007 m (EMU–8200–B); St. 9 ( 27º48'30"N 112º17'12"W ), February 10, 2007 , 4 M (CL ca 8.5 mm ), BS operated at 1396–1422 m ; St. 13 ( 27º49'46"N 111º43'18"W ), February 11, 2007 , 1 M (CL 8.0 mm) and 3 F (CL 5.5–9.0 mm), BS, operated at 668–704 m (EMU–8112); St. 14 ( 27º44'53"N 111º36'58"w ), February 11, 2007 , 3 M (CL 8.2–11.1 mm ) and 5 F (CL 7.2–9.8 mm ), BS operated at 905–943 m (EMU–8091); St. 15 ( 27º40'24"N 111º39'54"W ), February 11, 2007 , 4 F (CL 6.5–8.5 mm ), BS operated at 1528–1530 ; St. 17 ( 27º08'N 111º44'10"W ), February 12, 2007 , 2 F (CL 8.8–10.4 mm ) (EMU–8093–A), and 2 M (CL ca 8 mm ) and 2 F (CL ca 7 mm ) (EMU–8093–B), BS operated at 1289–1326 ; St. 18 ( 27º09'06"N 111º46'54"W ), February 12, 2007 , 1 M (CL 9.6 mm ), BS operated at 1526 m (EMU–8200–A); St. 19 ( 27º36'08"N 111º36'08"W ), February 12, 2007 , 2 F (CL 7.0 mm), operated at 1786–1816 m (EMU–8092); St. 22 ( 27º02'46"N 110º52'57"W ), 1 F (CL 7.0 mm), BS, operated at 1575–1586 m ; St. 25 ( 26º39'04"N 111º18'20"W ), February 14, 2007 , 1 M (CL ca 8 mm ) and 3 F (CL ca 8 mm ), BS operated at 837–840 m ; St. 26 ( 26º35'16"N 111º05'59"W ), February 14, 2007 , 3 damaged specimens (CL ca 8 mm ), BS operated at 1292–1301 m . TALUD XII. St. 26 ( 18º33'27"N 104º28'21"W ), April 1, 2008 , 1 F (CL 8.2 mm ), BS operated at 2125–2165 m . TALUD XV. St. 2 ( 23º12'02"N 111º20'50"W ), August 4, 2012 , 1 M (CL 8.6 mm ), BS operated at 1118–1150 m (EMU–10868); St. 3 ( 23º09'55"N 111º20'W ), August 4, 2012 , 1 F (CL ca 7 mm ), BS operated at 1395–1465 m (EMU–10874–A); St. 5E ( 23º05'22"N 110º27'54"W ), August 5, 2012 , 1 F. (CL 10.1 mm ), BS operated at 948–954 m (EMU–10874–B); St. 13 ( 25º02'12"N 112º54'06"W ), July 30, 2012 , 2 M (CL 7.1–9.4 mm ) and 1 F (CL 8.6 mm ), BS operated at 1210–1245 m (EMU–10876–A); St. 15 ( 25º18'50"N 113º12'17"W ), August 2, 2012 , 2 F (CL ca 7 mm ; damaged), BS operated at 1246–1309 m (EMU–10874–C); St. 17 ( 26º20'14"N 114º13'07"W ), July 31, 2012 , 1 F (CL ca 9 mm ), BS operated at 2111–2136 m (EMU–10876–B). TALUD XVI–B. St. 1 ( 28º27'24"N 115º48'55"W ), May 23, 2014 , 1 M (CL 10.2 mm ), BS operated at 2038– 2054 m (EMU–10869). Distribution . Indo –Pacific. In the eastern Pacific it has been recorded in the San Pedro Basin, California, USA , along the Baja California Peninsula, off the Revillagigedo Islands, and within the Gulf of California north to Tiburón Island; also reported from "Dowd Tablemount", off SW Mexico and off Chile ( Burkenroad 1938 ; Hanamura 1983 ; Hendrickx & Estrada-Navarrete 1996 ; Gúzman & Wicksten 2000 ; Guzmán 2008 ; Wicksten 2012 ). Distribution in western Mexico . As reported previously, G. s o rd i d u s is widely distributed throughout the southern and central Gulf of California, and along the west coast of the Baja California Peninsula ( Hendrickx & Estrada-Navarrete 1996 ). Material examined herein includes the first record of this species for SW Mexico ( 18º33'27"N 109º17'36"W ) ( Fig. 2 ). Remarks . Hendrickx & Estrada-Navarrete (1996) reported new material of this species from 22 localities throughout western Mexico , except along the SW coast and north of Tiburón Island, Gulf of California. All their specimens had been captured with small and medium–sized pelagic gear operating from the surface to a minimum depth of 165 m and a maximum depth of 300 m . Wicksten (2012) provided a depth range of 0–915 m corresponding to the deeper midwater trawl in which G. s o rd i d u s has been caught. There is, however, no precise information related to the depth of residence of G. s o rd i d u s except for the data provided by Hendrickx & Estrada- Navarrete (1996) indicating that it occurs in the epipelagic zone and maybe slightly deeper. Gennadas sordidus had previously been reported from five Mexican localities by Burkenroad (1938) . Material examined herein came from as many as 38 localities, 31 within the Gulf of California, 6 off Baja California, and one off SW Mexico ( Fig. 2 ), and G. sordidus is therefore and by far the most common and abundant species of the genus in western Mexico . In this study, 76 males and 107 females were collected providing an overall sex ratio of 1: 1.4 in favor of females.