Androgynella nipponicus Shiino 1937

• Main Authors: Larsen, Kim, Shimomura, Michitaka
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Tanaidacea; Apseudidae; Androgynella; Androgynella nipponicus; Antarc*; Antarctica; Kerguelen Islands; Tierra del Fuego
• Online Access: https://doi.org/10.5281/zenodo.6252859; http://treatment.plazi.org/id/03ED87D73B13FFB0FEBAF9BFFB090BCB

Androgynella nipponicus (Shiino, 1937) Apseudes nipponicus Shiino, 1937 Material examined 1 female (NSMT Cru R 245), 1 female (NSMT Cru R 246), 4 females (NSMT Cru R 245), 13 females (NSMT Cru R 245), all from Sagami Bay, depth 13 m. 18 August 1936. Remarks Shiino (1937) described Apseudes (now Androgynella Gutu, 2006) nipponicus from Sagami Bay. Lang (1953) described A. hermaphroditicus from Antarctica and noted the morphological similarity between his new species and A. nipponicus. Lang considered A. hermaphroditicus separate from A. nipponicus owing to differences in the rostrum, eyelobes and pleonal epimera (Lang 1953:349). Later, Shiino (1970) found similar­looking specimens from Tierra del Fuego, Argentina. He considered these to be conspecific to those found by Lang and that both species were a form of A. nipponicus and thus stated a bipolar distribution for this species. However, Lang (1958:536) had already synonymized A. hermaphroditicus with A. spectabilis (Studer, 1883) from the Kerguelen Islands (subantarctic Indian Ocean). It followed that A. nipponicus also must be a synonym of A. spectabilis, as finally stated by Lang (1973), although no direct comparison was ever made between A. nipponicus and A. spectabilis . As bipolar distributions of non­swimming peracarids are highly unlikely (see Larsen 2005) a closer examination of the type specimens was initiated. Also Gutu (2006:76) found this distribution suspect but refrained from re­erecting A. nipponicus due to lack of morphological evidence. The present study (based on re­examination of the types) reveals that A. nipponicus and A. spectabilis are separate species. The presence of a small but clearly visible ventral spine on the rostrum of A. nipponicus ( which is not present in A. spectabilis ), justify the resurrection of A. nipponicus. The eye­lobes and epimera characters mentioned by Lang (1953:349) are less distinct characters and could be attributed to variation or angle of observation. The situation is somewhat complicated by the fact that the ...