Pseudonesimus Chevreux 1926

• Main Authors: Kilgallen, N. M., Lowry, J. K.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Lysianassidae; Pseudonesimus; North Atlantic
• Online Access: https://doi.org/10.5281/zenodo.4909710; http://treatment.plazi.org/id/03DE241FFFA4FFBEF0A2FE7F52A3E9D7

Pseudonesimus Chevreux, 1926 Pseudonesimus Chevreux, 1926: 3.— Chevreux, 1935: 13.—J.L. Barnard, 1961: 50. Aristiopsis J.L. Barnard, 1961: 30.―J.L. Barnard, 1969: 299, 306, 310, 311, 314 (key), 324.― Barnard & Karaman, 1991: 467. (type species Aristiopsis tactius J.L. Barnard, 1961, original designation). Schisturella .―J.L. Barnard, 1969: 361 (in part).― Barnard & Karaman, 1991: 526 (in part). Type species. Pseudonesimus abyssi Chevreux, 1926, by monotypy. Included species. Pseudonesimus includes seven species: P. abyssi Chevreux, 1926; P. cedrosianus (J.L. Barnard, 1967); P. parachelatus (Ledoyer, 1986); P. robustus (J.L. Barnard, 1961); P. tacitus (J.L. Barnard, 1961); P. tasmanensis J.L. Barnard, 1961; P. zopa (J.L. Barnard, 1966). Diagnostic description. Antenna 1 flagellum article 1 lacking robust seta on distal margin; accessory flagellum forming cap. Antenna 2 flagellum articles 3–5 slender in female and (?) male, with weak brush setae on the anterior margin or brush setae absent. Mandibular incisor curved; molar with reduced column and convex triturating surface (button); palp attached midway. Maxilla 1 ST-7 serrate along the distomedial margin; ST-D slender, apically cuspidate. Maxilliped outer plate with apical robust setae. Gnathopod 1 subchelate; coxa vestigial; carpus subequal or slightly longer than propodus; propodus palm transverse, convex. Pereopod 4 coxa with well developed posteroventral lobe. Uropod 2 inner ramus constricted. Uropod 3 rami without plumose setae. Telson moderately to slightly cleft. Remarks. Pseudonesimus was originally described by Chevreux (1926) to accommodate the north Atlantic species Pseudonesimus abyssi . Aristiopsis was later described by Barnard (1961) for Aristiopsis tacitus . Barnard did not associate A. tacitus with Pseudonesimus , and did not draw any comparison between the two genera in his assessment of their relationships with other taxa. Thus, Pseudonesimus remained a monotypic genus (with two subspecies) for more than 40 years until it was eventually ...