| Summary: | Daptonema gelida sp. n. (Figures 2 A−E, 3A−B, 4A−C, 5A−C and Table 2) Type material. Ten males and nine females. All the type specimens were mounted in permanent glycerin slides. Holotype: male (slide number: М1/38). Paratypes: nine males (slide numbers: M1/39, M1/40, M1/41, M1/42, M1/43) and nine females (slide numbers: M1/38, M1/39, M1/40, M1/41, M1/42, M1/43). Holotype and paratypes were deposited in the collection of the Shirshov Institute of Oceanology of the Russian Academy of Sciences, Moscow, Russia. Type locality and habitat. Russia, the Kandalaksha Bay of the White Sea, the Ermolinskaya Inlet (66.555 N 33.041 E); first-year thin landfast ice (35 cm thickness); the lowermost 10 cm of ice core; often associated with the presence of macroalgae Fucus vesiculosus in ice samples; water depth 2.9 m. Etymology. The species epithet is derived from the Latin word gelida , meaning “frozen-in”, and refers to the habitat type. Descriptions. Males. Body slender and elongated, about 1.3–1.6 mm long. Body diameter gradually tapering towards both ends. Cuticle finely striated annulations. Short somatic setae uniformly distributed throughout the body, 3–6 µm in length, except for a few that increase toward the cardia. Head rounded, clearly set off, six inner labial papillae, six long outer labial setae and four cephalic setae in single circle, 0.4 corresponding body diameter (cbd) long. Amphideal fovea circular, with clear cuticular edging, 5–7 μm in diameter, and occupy 24.9–34.2% of cbd, posterior to the buccal cavity and located at 1.0–1.4 cbd from the anterior end. Buccal cavity conical-shaped with slightly sclerotized walls. Pharynx narrow, cylindrical, muscular, and gradually expands toward the cardia. Cardia short and heart-shaped, 6–7 µm long. Nerve ring at mid-length of pharynx. Secretory-excretory system not observed. Reproductive system diorchic with two outstretched testes; the anterior testis to the left of the intestine, longer and extending to the anterior part of the intestine; the posterior testis ...
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