<i>Neobirsteiniamysis inermis</i> (Willemoes-Suhm, 1874) (Peracarida, Mysida, Mysidae) in western Mexico

The offshore mysid Neobirsteiniamysis inermis (Willemoes-Suhm, 1874) is reported for the first time in western Mexico. A large series of specimens (168 specimens: 44 males, 124 females) was obtained from samples taken with a large benthic sled in as many as 28 localities distributed off the west coast of the Baja California Peninsula (15), in the Gulf of California (11), and off SW Mexico (2). Only one ovigerous female was collected. A complete description of the material, based on a mature specimen, is provided, including SEM images of the mandibles, which are described in detail, and of the eyes.

Keywords:
Distribution; eastern Pacific; eyes; mandibles; Mysida; Peracarida; redescription

Authorship

José Carlos Hernández-Payán

Universidad Nacional Autónoma de México, Unidad Académica Mazatlán Instituto de Ciencias del Mar y Limnología, Laboratorio de Invertebrados Bentónicos. Mazatlán, Sinaloa, 82000, Mexico.Universidad Nacional Autónoma de MéxicoMexicoMazatlán, Sinaloa, Mexico Universidad Nacional Autónoma de México, Unidad Académica Mazatlán Instituto de Ciencias del Mar y Limnología, Laboratorio de Invertebrados Bentónicos. Mazatlán, Sinaloa, 82000, Mexico.

Universidad Nacional Autónoma de México, Instituto de Ciencias del Mar y Limnología, Programa de Postgrado en Ciencias del Mar y Limnología. Mexico City, Mexico.Universidad Nacional Autónoma de MéxicoMexicoMexico City, Mexico Universidad Nacional Autónoma de México, Instituto de Ciencias del Mar y Limnología, Programa de Postgrado en Ciencias del Mar y Limnología. Mexico City, Mexico.

http://orcid.org/0000-0003-1483-1289

Michel E. Hendrickx

http://orcid.org/0000-0001-9187-6080

JCH-P
E-mail:
jose_carlos_11@hotmail.com

MEH
E-mail:
michel@ola.icmyl.unam.mx

CORRESPONDING AUTHOR
Michel E. Hendrickx michel@ola.icmyl.unam.mx

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables

Figures (10)
Tables (1)

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Figure 1.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, lateral view; B, lateral view of the eyes; C, dorsal view of the carapace; D, antennal peduncle and scale; E, antennular peduncle.

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Figure 2.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, left and right mandibles and mandibular palp; B, maxilla; C, maxillula; D, labrum.

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Figure 3.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female CL 15.01 (ICML-EMU-12590-C). A, thoracopod 1; B, same, endopodite detail; C, thoracopod 2; D, same, detail of the last 2 articles; E, thoracopod 3; F, thoracopod 4.

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Figure 4.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, thoracopod 5; B, detail of the tuft of hook-shaped setae in the carpus; C, thoracopod 6; D, thoracopod 7; E, thoracopod 8; F, penis.

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Figure 5.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 mm and male, CL 16.20 mm (ICML-EMU-12590-C and 12594-A). A‒F, pleopods 1-5 of male; G‒K, pleopods 1‒5 of female.

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Figure 6.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 mm (ICML-EMU-12590-C). A, uropods, dorsal view; B, telson, dorsal view.

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Figure 7.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 18.08 mm (ICML-EMU-12581). SEM photographs. A‒C, right mandible; D‒F, left mandible.

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Figure 8.
Localities off western Mexico where specimens of Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.) were collected.

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Figure 9.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 18.08 (ICML-EMU-12581). SEM photographs. A, lateral view of the eye; B, same, different angle; C, fibrous microstructures in the concave surface.

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Figure 10.
Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Variation in size and location of the ocular papilla (A, C, E, G, I), and of the rostrum shape (B, D, F, H, J). A, B, male, CL 9.54 mm (ICML-EMU-12591-A); C, D, male, CL 11.03 mm (ICML-EMU-12586); E, F, male, CL 10.55 (ICML-EMU-12584-B); G, H, female, CL 14.88 (ICML-EMU-12582); I, J, female, CL 18.08 (ICML-EMU-12581).

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Table 1.
Total depth (depth range) recorded at localities where specimens of Neobirsteiniamysis inermis (Willemos-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.) were collected during this study.

Figure 1. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, lateral view; B, lateral view of the eyes; C, dorsal view of the carapace; D, antennal peduncle and scale; E, antennular peduncle.

Figure 2. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, left and right mandibles and mandibular palp; B, maxilla; C, maxillula; D, labrum.

Figure 3. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female CL 15.01 (ICML-EMU-12590-C). A, thoracopod 1; B, same, endopodite detail; C, thoracopod 2; D, same, detail of the last 2 articles; E, thoracopod 3; F, thoracopod 4.

Figure 4. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 (ICML-EMU-12590-C). A, thoracopod 5; B, detail of the tuft of hook-shaped setae in the carpus; C, thoracopod 6; D, thoracopod 7; E, thoracopod 8; F, penis.

Figure 5. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 mm and male, CL 16.20 mm (ICML-EMU-12590-C and 12594-A). A‒F, pleopods 1-5 of male; G‒K, pleopods 1‒5 of female.

Figure 6. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 15.01 mm (ICML-EMU-12590-C). A, uropods, dorsal view; B, telson, dorsal view.

Figure 7. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 18.08 mm (ICML-EMU-12581). SEM photographs. A‒C, right mandible; D‒F, left mandible.

Figure 8. Localities off western Mexico where specimens of Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.) were collected.

Figure 9. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Female, CL 18.08 (ICML-EMU-12581). SEM photographs. A, lateral view of the eye; B, same, different angle; C, fibrous microstructures in the concave surface.

Figure 10. Neobirsteiniamysis inermis (Willemoes-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.). Variation in size and location of the ocular papilla (A, C, E, G, I), and of the rostrum shape (B, D, F, H, J). A, B, male, CL 9.54 mm (ICML-EMU-12591-A); C, D, male, CL 11.03 mm (ICML-EMU-12586); E, F, male, CL 10.55 (ICML-EMU-12584-B); G, H, female, CL 14.88 (ICML-EMU-12582); I, J, female, CL 18.08 (ICML-EMU-12581).

Table 1. Total depth (depth range) recorded at localities where specimens of Neobirsteiniamysis inermis (Willemos-Suhm, 1874Willemoes-Suhm, R. von 1874. Von der Challenger expedition: Briefean C. Th. E. v. Siebold, II. Zeitschrift für Wissenschaftliche Zoologie, 24: ix‒xxiii.) were collected during this study.

Cruises	Localities	Number of specimens	Depth range
Gulf California
TALUD IV	1	4	1200‒1274 m
TALUD V	1	1	1280‒1310 m
TALUD VI	1	1	1280‒1310 m
TALUD VII	3	72	780‒1450 m
TALUD VIII	1	9	1140‒1150 m
TALUD IX	2	4	969‒1225 m
TALUD X	2	3	1396‒1526 m
Western Baja
TALUD XV	3	7	1210‒1494 m
TALUD XVI-B	12	58	710‒2093 m
SW Mexico
TALUD XII	2	9	1392‒2125 m
Total	28	168	710‒2125 m

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[1] JCH-P
E-mail:
jose_carlos_11@hotmail.com