Nematocarcinus agassizii Faxon 1893
- Dataset
- Two species of the deep-water shrimp genus Nematocarcinus A. Milne – Edwards, 1881 (Crustacea, Decapoda, Caridea, Nematocarcinidae) from the Mexican Pacific
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Decapoda
- family
- Nematocarcinidae
- genus
- Nematocarcinus
- species
- Nematocarcinus agassizii
discussion
Remarks. While reviewing species of Nematocarcinus collected in the southwestern Atlantic, Cardoso & Burukovsky (2014) compared material of N. gracilipes Fihol, 1884 with that of N. agassizii and came to the conclusion that the latter is a junior subjective synonym of the former. They pointed out that N. agassizii and N.
materials_examined
Characteristics. Rostrum distinctly longer than carapace in males (1.06 times CL; n = 10), shorter in females (0.86 CL; n = 10), elongate, almost horizontal from its base to 2 / 5 of its length, remaining portion without dorsal teeth and gently curved upwards, ending in a sharp point, numerous closely set teeth (23 – 32) (up to 38 in material examined; n = 10) on the dorsal margin in proximal 1 / 3 to 1 / 2 of its length; 3 – 4 ventral teeth in the distal half. Flagella of both antennas long, that of antennule almost twice the antennal flagellum length and more than twice the length of the whole body. Antennal scale with lamella distally truncated. Spines on pereiopods 1 – 5 as follows: first pereiopod, ischium 2, merus 1; second, ischium 2, merus 1; third, ischium 1, merus 5 + 7; fourth, ischium 1, merus 4 + 4; fifth, ischium 1, merus 3 + 5. Carpus of all pereiopods without spine. Pereiopods 3 – 5 greatly elongate, of about the same length, carpus of these legs 5 – 7 length of propodus, combined length of ischium, merus and carpus about 4 times as long as carapace length. Third pleomere with posterodorsal margin of tergum somewhat extended over fourth pleomere, tip of margin rounded. Pleura of fifth pleomere without bump on inner sides, ending in a sharp spine curved slightly downward. Spots of ventral organ of sixth pleomere small, hardly discernible, kidney-shaped, slightly narrowing forward, 2 – 2.5 times as long as wide, distance between the spots about 2.1 times spots width (n = 10); setal pits arrange in single line on each side, nearly parallel. Length of telson barely exceeding length of sixth pleomere in females (telson / 6 th pleomere ratio, 1.05; n = 10), proportionally longer in males (telson / 6 th pleomere ratio, 1.21; n = 10), armed with 7 pairs of dorsolateral spines, and 3 pairs of spines on posterior tip (modified and completed from Burukovsky 2003, 2013) (Figures 1, 2 A, 3, 4 A, 5 A – C). Colour. Crimson red (Figure 2 A). Material examined. TALUD XV, St. 1 (23 º 18 ’ 40 ” N; 111 º 19 ’ 37 ” W), Ago 4, 2012, 10 M (CL 21.51 – 25.42 mm), 4 F (CL 20.49 – 24.74 mm), 26 OF (CL 23.32 – 31.21 mm), BS, 750 – 850 m (ICML-EMU- 10773, 10787); St. 24 (27 º 05 ’ 42 ” N; 114 º 35 ’ 30 ” W), Ago 1, 2012, 34 M (CL 18.36 – 27.04 mm), 4 F (CL 20.48 – 25.39 mm), BS, 772 – 786 m (ICML-EMU- 10774); TALUD XVI – B, St. 5 (28 º 48 ’ N; 115 º 24 ’ 06 ” W), May 24, 2014, 16 M (CL 13.59 – 27.89 mm), 35 F (CL 13.59 – 29.61 mm), 17 OF (CL 27.23 – 30.22 mm), BS, 772 – 776 m (ICML-EMU- 10775, 10788); St. 7 (20 º 21 ’ 12 ” N; 115 º 39 ’ 08 ” W), May 31, 2014, 2 M (CL 14.28 – 14.95 mm), 4 F (CL 13.75 – 16.38 mm), 1 OF (CL 28.56 mm), BS, 750 – 710 m (ICML-EMU- 10776); St. 10 (29 º 07 ’ 50 ” N; 116 º 15 ’ 30 ” W), May 30, 2014, 2 M (CL 12.03 – 21.34 mm), 4 F (CL 20.79 – 28.96 mm), 4 OF (CL 29.03 – 31.90 mm), BS, 860 – 910 m (ICML-EMU- 10777, 10789); St. 23 (30 º 56 ’ 24 ” N; 116 º 40 ’ 45 ” W), May 27, 2014, 1 M (CL 23.48 mm), 1 F (CL 21.10 mm), BS, 1296 – 1340 m (ICML-EMU- 10778). Additional material examined. Lectotype USNM 291472 (ex 21233). R / V " Albatross " St. 3358, Coiba Island, Panama, February 24, 1891. Paralectotypes: 1 ovigerous female, CL 29.4 mm, USNM 21233, and 2 ovigerous female, CL 30.1 and 34.5 mm, USNM 21152. Geographical distribution. From off Ahome, Sinaloa, Mexico, to Mancora Bank, Peru; Coco (del Coco) (Costa Rica), Malpelo (Colombia) and Galápagos (Ecuador) islands (Wicksten & Hendrickx 2003). Based on the material examined, the distribution of N. agassizii extends to the west coast of the Baja California Peninsula (Figure 6). The Scripps Institution of Oceanography invertebrates collection contains one lot of Nematocarcinus agassizii (Id. M. K. Wicksten) (C- 10435) captured by the R / V " New Horizon " (ROSA cruise, March 24, 1993) in 503 – 795 m depth, at 30 º 36.36 ' N, 117 º 12.14 ' W.
Name
- Homonyms
- Nematocarcinus agassizii Faxon 1893