Lumbricillus antarcticus Stephenson 1932

• Main Authors: Klinth, Mårten J., Rota, Emilia, Martinsson, Svante, Prantoni, Alessandro L., Erséus, Christer
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Clitellata; Enchytraeida; Enchytraeidae; Lumbricillus; Lumbricillus antarcticus; Antarc*; Antarctic; Antarctic Peninsula; Antarctica; antarcticus; Snow Island; South Georgia Island; South Shetland Islands
• Online Access: https://doi.org/10.5281/zenodo.6461091; http://treatment.plazi.org/id/039DC377FFB8FFDF4E64FB57FDBF5D31

LUMBRICILLUS ANTARCTICUS STEPHENSON, 1932 (FIGS 3, 4A–C) Lumbricillus antarcticus Stephenson, 1932: 256–257, fig. 8. Lumbricillus sp. 2 – Prantoni et al. , 2018 (confirmed by comparison of COI data). Lumbricillus cf. antarcticus – Lee et al. , 2019: 4–5, fig. 4. Type material: BMNH 1933.2.23.899–900, two mature sectioned specimens (studied), BMNH 1931.06.23.89/90 (in alcohol, not studied). Syntypes. Loc. Wilson Harbour, South Georgia. Leg. ‘Discovery’ 1925–1927 (Stephenson, 1932), see Boros & Sherlock (2010). Type locality: Wilson Harbour, South Georgia Island. According to Stephenson (1932), the sample was labelled as ‘moss dwellers’, but the sampling station was listed as ‘hauled’ from 15–45 and 26–83 m using a beam trawl. New material examined: SMNH 198144–198147 (CE 12479–CE12482), four mature specimens collected intertidally in 2010 from South Georgia Island, and SMNH 198148 (CE 34641) and SMNH 198149 (CE 34643), two mature specimens collected in 2015 from algae on intertidal rocks at Snow Island (South Shetland Islands, Antarctica). All new specimens are mounted on slides and serve as vouchers of genetic data. For details on collection and GenBank accession numbers for COI barcodes (and other genes for some specimens), see Table 1 and the Supporting Information (Table S1). Diagnosis: This species, now differentiated by a unique COI barcode, is a member of the L. lineatus group, meaning that it has testis sacs forming clubshaped lobes arranged in a fan shape, and spindleshaped spermathecae. It can be distinguished from other L. lineatus group members by combining: (1) short sperm funnel, 1.0–1.5 times longer than wide; (2) spermatheca that widens gradually from the ectal pore, to be widest midway or two-thirds in and gradually tapers towards the oesophagus, where it connects to the latter; and (3) the geographical range, in that it is known only from the Subantarctic Islands and Antarctic Peninsula. Description: Length of first 20–26 segments is 3.1– 7.1 mm (fixed, amputated specimens); first 15 ...