Lumbricillus nivalis Klinth, Rota, Martinsson, Prantoni & Erséus, 2022, SP. NOV.

• Main Authors: Klinth, Mårten J., Rota, Emilia, Martinsson, Svante, Prantoni, Alessandro L., Erséus, Christer
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Clitellata; Enchytraeida; Enchytraeidae; Lumbricillus; Lumbricillus nivalis; South Shetland Islands; Vasa; Snow Island; Antarc*; Antarctica
• Online Access: https://zenodo.org/record/6461097; https://doi.org/10.5281/zenodo.6461097

LUMBRICILLUS NIVALIS KLINTH, ROTA & ERSÉUS SP. NOV. (FIG. 5) Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: D62E6765-ED4D-498D-A300-50D5232BDD14 Holotype: SMNH Type Coll. 9310 (CE34644), a mature amputated specimen stained in Paracarmine and mounted on a slide. Leg. Karla Paresque, 15 January 2015. COI barcode, GenBank MZ 393952; accession numbers for additional genetic data are given in Table 1 and the Supporting Information (Table S1). Type locality: Snow Island, South Shetland Islands, Antarctica, from algae on rocks in intertidal zone, 62.7753 S, 61.2858 W. Etymology: The Latin adjective nivalis means snowy, alluding to the name of the type locality, Snow Island. 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: (1) its short sperm funnels, 1.5–2.0 times longer than wide; (2) vasa deferentia extending posterior to XII; (3) spermathecae with short ectal duct, rapidly widening into ampulla, with ampulla widest ectally, gradually tapering towards ental duct, which connects to oesophagus; and (4) clitellum ventrally absent in XII but present ventrally in (first half of) XIII. Description: Length of first 25 segments 6 mm (fixed, amputated specimen); first 15 segments 3.7 mm long; width at clitellum 0.50 mm. Chaetae sigmoid (Fig. 5A). Upper bundles dorsolateral (higher than the lateral line but closer to it than the ventral bundles), with three to five chaetae anterior and posterior of clitellum, at least to XXV. Ventral bundles with (three) four to six throughout to XXV. The longest measured chaetae 60 µm long, ~3–5 µm wide. Epidermis loosely covered with rows of pale gland cells. Clitellum with reticulate pattern of gland cells, extending over XII–1/2XIII, interrupted ventrally in XII but present ventrally in XIII. Coelomocytes numerous, ~10–15 ...