Notodelphyopsis gemina Kim & Boxshall 2020, sp. nov.

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Cyclopoida; Notodelphyidae; Notodelphyopsis; Notodelphyopsis gemina; Antarctic; Antarctic Ocean; Seta; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/5661667; https://doi.org/10.5281/zenodo.5661667

Notodelphyopsis gemina sp. nov. (Figs. 55–57) Typematerial. Holotype (intact ♀, MNHN-IU-2009- 5191), paratypes (19 intact ♀♀, MNHN-IU-2014-21232), and dissected paratypes (1 ♀, 1 ♂, figured), from Corella antarctica Sluiter, 1905, Antarctic Ocean (61°26 Ś, 41°55.4 Ẃ), depth 604 m, Eltanin cruise 12, 12 April 1964. Etymology. The specific name is derived from the Latin gemin (=twin), alluding to the close similarity of the new species to Notodelphyopsis illgi. Descriptionoffemale. Body (Fig. 55A) slender, 1.87 mm long. Cephalosome well-defined, but articulations between pedigeroussomites indistinct: first to third pedigerous somites lacking epimera. Brood pouch variable in form; fifth pedigerous somite completely fused to brood pouch. Free urosome (Fig. 55B) slender, 4-segmented. Genital double-somite (Fig. 55C) 210×149 μm, subdivided dorsally and ventrally by faint, indistinct suture line at anterior third and ornamented with several transverse rows of minute spinules on ventral surface. Three freeabdominal somites 152×131, 135×108, and 115×108 μm, respectively. Caudalramus (Fig. 55D) elongate, about 9.3 times as long as wide (325×35 μm) and 2.8 timeslongerthan anal somite, subdivided by constriction at 60% of length; ornamented with dense covering of setules on ventral surface; armed with 6 setae, 4 distal setae pinnate, other 2 naked, outer lateral seta located at 65% of ramus length. [table omitted] Rostrum (Fig. 55E) 87×70 μm, spatulate, with nearly parallel lateral margins. Antennule (Fig. 55F) slender, elongate, 575 μm long and extending to posterior margin of second pedigerous somite; 9-segmented (Fig. 30), armatureformula 3, 17, 6, 4+aesthetasc, 4, 2, 2, 2+aesthetasc, and 7+aesthetasc; several setae on proximal segments weakly pinnate, others naked (as figured). Antenna (Fig. 56A) 4-segmented, consistingof coxa, basis and 2-segmented endopod; coxa short and unarmed; basis with 2 equal, large pinnate setae representing exopod; first endopodal segment with 1 setaon inner margin; compound distal endopodal ...