Nematocarcinus faxoni Burukovsky 2001
Creators: name: Hernandez-Payan, J. C.
name: Hendrickx, M. E.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Nematocarcinidae
Nematocarcinus
Nematocarcinus faxoni

description: Nematocarcinus faxoni Burukovsky, 2001
Figures 2 B, 5D, 7
Nematocarcinus ensifer. Faxon 1895: 156 –157 (part); Crosnier & Forest 1973: 116 (part); Wicksten 1989: 312 (list); Wicksten & Hendrickx 1992: 7 (list); 2003: 59 (list); Hendrickx 1995: 454 (key), fig. 2.
Nematocarcinus cf. ensifer. Hendrickx, 2001: 99, fig. 1, tables 3, 4.
Nematocarcinus faxoni Burukovsky, 2001: 1429, figs. 1, 2; 2003: 92–95, fig. 25 a–g; 2004: 558 (key); 2012: 112–115, figs. 36, 37. Komai & Segonsac 2005: 361, fig. 11.
Characteristics. Rostrum curving up into the shape of a sword, as long as 0.7 times of the length of the carapace, postrostral crest usually with 20–32 dorsal teeth, often between 25 and 27 widely separated teeth (23 to 30 teeth in material examined; n = 10); ventral teeth 0–5, usually 2–3. Spines on pereiopods 1–5 as follows: first pereiopod, ischium 4, merus 2; second, ischium 3, merus 6 + 1; third, ischium 1, merus 5 + 5; fourth, ischium 1, merus 3; fifth, ischium 0, merus 2. Carpus of all periopods without spines. Pereiopods 3–5 greatly elongate, of about the same length, carpus of these legs 7–8 length of propodus; combined length of ischium, merus and carpus about 3 times as long as carapace length. Dorsal posterior protrusion of the 3rd pleomere moderately developed. Fifth pleomere with a low conspicuously elongated protrusion whose length is aimed at a very sharp angle to the front side of the pleura and crosses just above the tooth which is well developed; anteroventral margin of the pleura slightly recurved. Pleura of 5th pleomere with an elongate protuberance on the inner side. Spots of the ventral organ of 6th pleomere widely rounded, 1.5–2 times longer than wide, distance between these spots not exceeding the width of the spots; one row of setae on each side, rows aligned and nearly parallel to each other. Length of telson barely exceeding length of sixth pleomere in females (telson/6th pleomere ratio, 1.05; n = 10), proportionally longer in males (telson/6th pleomere ratio, 1.13; n = 10), armed with 6–9 pairs of spines on the dorsal margin, and 3 pairs of spines on posterior tip (adapted from Burukovsky 2003, 2013) (Figures 2 B, 5D, 7).
Color. Crimson red (Figure 2 B).
Material examined. TALUD III, St. 14-A (24º38’48”N; 108º26’54”W), Aug 19, 1991, 12 M (CL 13.05–18.88 mm), 25 F (CL 16.09–20.73 mm), 9 OF (CL 19.53–22.4 mm), AD, 1016–1020 m (ICML-EMU-4038); St. 14-B (24º39’12”N; 108º19’12”W), Aug 19, 1991, 1 M (CL 19.82 mm), 3 F (CL 19.22–24.7 mm), 1 OF (CL 24.31 mm), AD, 1188–1208 m (ICML-EMU-4039); St. 24 (25º33’36”N; 109º42’01”W), Aug 21, 1991, 1 M (CL 19.87 mm), AD, 1043 m (ICML-EMU-4040); St. 24-B (25º45’12”N; 109º46’54”W), Aug 21, 1991, 6 M (CL 16.4–19.17 mm), 6 F (CL 13.52–19.28 mm), 2 OF (CL 20.4–21.21 mm), AD, 1027–1060 m (ICML-EMU-4041).
TALUD IV, St. 13 (23º17’30”N; 107º29’51”W), Aug 29, 2000, 3 M (CL 11.43–16.16 mm), 2 F (CL 15.92– 17.5 mm), BS, 860 m (ICML-EMU-6590); St. 26 (24º56’24”N; 109º05’36”W), Aug 26, 2000, 1 M (CL 11.2 mm), 3 F (CL 11.53–13.78 mm), 1 OF (CL 22.36 mm) BS, 1200–1264 m (ICML-EMU-6581-A); St. 33 (25º45’54”N; 109º48’06”W), Aug 27, 2000, 2 M (CL 17.92–19.74 mm), BS, 1060–1080 m (ICML-EMU-6588); St. 34 (25º40’42”N; 109º54’24”W), Aug 27, 2000, 1 M (CL 17.71 mm), BS, 1240 m (ICML-EMU-6589).
TALUD V, St. 12 (23º18’00”N; 107º26’59”W), Dec 14, 2000, 2 F (CL 21.2–21.56 mm), BS, 1160–1170 m (ICML-EMU-6587); St. 26 (24º56’18”N; 109º11’48”W), Dec 16, 2000, 2 M (CL 15.48–20.58 mm), 1 F (CL 12.65 mm), BS, 1280–1310 m (ICML-EMU-6581-B).
TALUD VI, St. 20 (24º14’48”N; 108º35’11”W), Mar 15, 2001, 1 OF (CL 26.76 mm), BS, 1250–1440 m (ICML-EMU-6691); St. 34 (25º43’50”N; 109º53’59”W), Mar 17, 2001, 33 M (CL 14.35–24.93 mm), 27 F (CL 12.88–28.00 mm), 6 OF (CL 23.20–26.61 mm), BS, 1210–1270 m (ICML-EMU-6576).
TALUD VII, St. 4 (22º03’18”N; 106º34’42”W), Jun 5, 2001, 1 OF (CL 21.63 mm), BS, 1200–1230 m (ICML- EMU-6586); St. 12 (23º18’18”N; 107º26’48”W), Jun 6, 2001, 1 F (CL 24.61 mm), BS, 1040–1120 m (ICML- EMU-6584); St. 13-B (23º30’18”N; 107º44’00”W), Jun 6, 2001, 12 M (CL 15.31–21.05 mm), 6 F (CL 18.64–25.1 mm), 1 OF (CL 25.37 mm), BS, 1400–1450 m (ICML-EMU-6580); St. 19 (24º16’12”N; 108º23’42”W), Jun 7, 2001, 19 M (CL 10.88–21.26 mm), 31 F (CL 9.05–23.26 mm), 1 OF (CL 24.63 mm), BS, 1160–1180 m (ICML- EMU-6696, 6577).
TALUD VIII, St. 3 (24º32’36”N; 109º30’30”W), Apr, 16, 2005, 19 M (CL 9.04–22.86 mm), 30 F (CL 9.40– 22.91 mm), 4 OF (CL 20.73–21.66 mm), BS, 1600 m (ICML-EMU-10732A, 10732B); St. 10 (24º58’12”N; 110º16’06”W), 3 M (CL 18.66–21.80 mm), BS, 1500 m (ICML-EMU-10733).
TALUD IX, St. 10 (24º56’24”N; 110º16’42”W), Nov 12, 2005, 1 M (CL 16.26 mm), 3 F (CL 11.26–22.91 mm), BS, 969–1225 m (ICML-EMU-10734); St. 21–B (26º04’42”N; 110º34’48”W), Nov 14, 2005, 2 M (CL 13.51– 14.97 mm), 3 F (CL 17.79–25.09 mm), 1 OF (CL 24.34 mm), BS, 1349–1369 m (ICML-EMU-10735).
TALUD X, St. 10 (27º48’30”N; 112º17’12”W), Feb 10, 2007, 2 M (CL 14.07–19.58 mm), BS, 1396–1422 m (ICML-EMU-8095); St. 18 (27º09’06”N; 111º46’54”W), Feb 12, 2007, 1 M (CL 19.72 mm), 1 F (CL 20.62 mm), BS, 1526 m (ICML-EMU-10736-A, 10736-B); St. 21 (27º14’31”N; 111º14’39”W), Feb 13, 2007, 1 F (CL 25.00 mm), BS, 1864–1865 m (ICML-EMU-10737); St. 22 (27º02’46”N; 110º52’57”W), Feb 13, 2007, 8 M (CL 13.28– 24.89 mm), 6 F (CL 14.93–27.18 mm), 5 OF (CL 21.46–26.27 mm), BS, 1575–1586 m (ICML-EMU-10738); St. 29 (26º35’36”N; 110º35’44”W), Feb 15, 2007, 1 F (CL 17.1 15.07 mm), BS, 1383–1439 m (ICML-EMU-10739); St. 30 (26º36’50”N; 110º21’10”W), Feb 15, 2007, 2 F (CL 14.00– 20.96 mm), BS, 1203–1213 m (ICML-EMU- 10740).
TALUD XII, St. 9 (17º10’15”N; 101º37’23”W), Mar 29, 2008, 3 M (CL 18.70–21.44 mm) 4 F (CL 20.72– 27.42 mm), BS, 1392–1420 m (ICML-EMU-10779); St. 10 (17º11’03”N; 101º28’05”W), Mar 28, 2008, 7 F (CL 13.32–27.62 mm), BS, 1180–1299 m (ICML-EMU-10741); St. 13 (17º45’16”N; 102º00’29”W), Mar 30, 2008, 5 M (CL 18.63–21.11 mm), 3 F (CL 17.34–17.35 20.75–25.43 mm), BS, 1199– 1100 m (ICML-EMU-10742); St. 23 (18º33’43”N; 103º57’45”W), Apr 1, 2008, 84 M (CL 11.46–21.97 mm), 279 F (CL 13.47–26.27 mm), 3 OF (CL 21.43–24.80 mm), BS, 1058–1088 m (ICML-EMU-10743, 10744, 10745); St. 24 (18º28’00”N; 104º14’10”W), Apr 1, 2008, 7 M (CL 13.95–22.2 mm), 4 F (CL 15.65–23.83 mm), 1 OF (CL 23.3 mm), BS, 1535–1542 m (ICML-EMU-10746); St. 25 (18º26’45”N; 104º16’10”W), Apr 1, 2008, 2 M (CL 23.87–25.66 mm), 1 F (CL 18.95 mm), BS, 1858–1879 m (ICML-EMU-10747); St. 27 (18º40’28”N; 104º35’51”W), Apr 2, 2008, 5 M (CL 14.00– 16.93 mm), 10 F (CL 10.36–19.44 mm), BS, 1040–1095 m (ICML-EMU-10748); St. 28 (18º50’19”N; 104º34’14”W), Apr 2, 2008, 23 M (CL 13.05–24.18 mm), 35 F (CL 9.31–24.88 mm), BS, 1101–1106 m (ICML- EMU-10749); St. 29 (19º19’37”N; 105º26’20”W), Apr 2, 2008, 12 M (CL 13.28–23.97 mm), 17 F (CL 15.50– 27.98 mm), 4 OF (CL 21.51–28.33 mm), BS, 1609–1643 m (ICML-EMU-10750).
TALUD XV, St. 1 (23º18’40”N; 111º19’37”W), Ago 4, 2012, 44 M (CL 12.52–21.48 mm), 66 F (CL 12.27– 23.94 mm), 11 OF (CL 17.96–22.60 mm), BS, 750–850 m (ICML-EMU-10751, 10752, 10781); St. 2 (23º12’02”N; 111º20’50”W), Ago 5, 2012, 21 M (CL 14.07–21.51 mm), 29 F (CL 10.62–27.43 mm), 3 OF (CL 22.83–24.47 mm), BS, 1118–1150 m (ICML-EMU-10753, 10754, 10784); St. 3 (23º09’55”N; 111º20’0”W), Ago 6, 2012, 2 M (CL 18.94–23.96 mm), 2 F (CL 17.30–21.82 mm), BS, 1395–1465 m (ICML-EMU-10755); St. 5C (23º16’42”N; 110º54’55”W), Ago 5, 2012, 79 M (CL 12.32–26.60 mm) (ICML-EMU-10756), 145 F (CL 13.05–26.27 mm), 16 OF (CL 19.75–26.14 mm), BS, 980–1036 m (ICML-EMU-10757, 10780); St. 5E (23º05’22”N; 110º27’54”W), Ago 6, 2012, 42 M (CL 13.54–22.02 mm), 64 F (CL 13.52–23.11 mm), 13 OF (CL 18.10–25.00 mm), BS, 948– 954 m (ICML-EMU-10758, 10759); St. 8 (25º02’12”N; 112º54’06”W), Jul 30, 2012, 7 M (CL 18.81–24.85 mm), 4 F (CL 17.34–20.9 mm), 1 OF (CL 21.56 mm), BS, 1210–1245 m (ICML-EMU-10760); St. 9 (24º25’12”N; 112º52’48”W), Jul 30, 2012, 10 M (CL 17.67–24.54 mm), 1 F (CL 20.59 mm), BS, 1425–1494 m (ICML-EMU- 10782); St. 24 (27º05’42”N; 114º35’30”W), Ago 1, 2012, 4 M (CL 15.63–18.6 mm), 10 F (CL 14.54–23.36 mm), BS, 772–786 m (ICML-EMU-10761).
TALUD XVI, St. 3 (28º 39.0N; 115º 49.0W), Jul 31, 2013, 5 M (CL 18.21–24.87 mm), 4 F (CL 17.79–20.92 mm), BS, 1397–1408 m (ICML-EMU-10762, 10785).
TALUD XVI–B, St. 3 (28°42’36’’N; 115°50’42”W), May 23, 2014, 4 M (CL 18.08–21.95 mm), 1 OF (CL 20.54 mm), BS, 1350–1365 m (ICML-EMU-10763); St. 8 (29°23’48’’N; 115°45’12’’W), May 31, 2014, 2 M (CL 16.21–16.50 mm), 3 F (CL 10.61–17.93 mm), BS, 1416–1480 m (ICML-EMU-10764); St. 9 (29º20’53’’N; 115º51’), May 31, 2014, 2 M (CL 20.79–23.39 mm), 1 F (CL 20.77 mm), BS, 1848–1860 m (EMU-10765); St. 16 (29º51’24’’N; 116º09’06’’W), May 29, 2014, 2 M (CL 19.51–21.14 mm), 3 F (CL 15.44–18.60 mm), BS, 1425– 1360 m (ICML-EMU-10766); St. 19 (30º38’N; 116º31’40’’W), May 25, 2014, 2 M (CL 13.97–14.67 mm), 1 F (CL 26.99 16.03 mm), BS, 1385–1433 m (ICML-EMU-10767); St. 21 (30º49’24’’N; 116º47’48’’W), May 28, 2014, 2 F (CL 17.80–27.78 mm), BS, 2018–2093 m (EMU–10768); St. 22 (30º49’47’’N; 116º35’54’’W), May 28, 2014, 1 M (CL 23.34 mm), 1 F (CL 24.05 mm), BS, 1480–1560 m (ICML-EMU-10769); St. 23 (30º56’2’’N; 116º40’55’’W), May 27, 2014, 4 M (CL 14.82–20.06 mm), 3 F (CL 12.97–20.00 mm), BS, 1296–1340 m (EMU-10770, 10786); St. 28 (31º22’N; 117º02’W), May 27, 2014, 1 F (CL 21.97 mm), BS, 1461–1532 m (EMU-10772).
Additional material examined. Holotype, female, CL 25 mm, USNM 1073696. R/V "Albatross", St. 3418, off Acapulco, Mexico, April 11, 1891.
Geographical distribution. Previously known from Guaymas basin, central Gulf of California to Acapulco (16º33’N, 99º52’W), Mexico (Wicksten & Hendrickx 2003); West Atlantic, roughly from 27º58’N, 78º27’W to 23º47’N, 78º46’W (Cardoso & Burukowki 2014). The Atlantic record is questionable, because the distribution is vicariant. Based on the material examined herein, Nematocarcinus faxoni distribution is extended to 27º48’30”N in the Gulf of California and off the west coast of the Baja California Peninsula to 31º22’ N (Figure 8).
Remarks. Nematocarcinus faxoni is clearly the dominant species of the genus in deep-water off the Pacific coast of Mexico. The combination of the structure of the ventral organ of the sixth pleomerer (Figure 7 E), the shape and size of the rostrum (Figures 2 B, 7A), the presence of an inner protuberance on the pleura of fifth pleomere (Figure 7 F), and the larger space between proximal rostral teeth (Figures 7 A) allow to separate this species from N. agassizii.
description: Published as part of Hernandez-Payan, J. C. & Hendrickx, M. E., 2016, Two species of the deep-water shrimp genus Nematocarcinus A. Milne – Edwards, 1881 (Crustacea, Decapoda, Caridea, Nematocarcinidae) from the Mexican Pacific, pp. 587-599 in Zootaxa 4126 (4) on pages 593-597, DOI: 10.11646/zootaxa.4126.4.9, http://zenodo.org/record/267779