Artemisina lundbecki Morozov & Sabirov & Zimina 2019, sp. nov.

• Main Authors: Morozov, Grigori, Sabirov, Rushan, Zimina, Olga
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Porifera; Demospongiae; Poecilosclerida; Microcionidae; Artemisina; Artemisina lundbecki; laptev; Laptev Sea
• Online Access: https://doi.org/10.5281/zenodo.3664851; http://treatment.plazi.org/id/03A287D2FC6541509B9BF98A36AF34C4

Artemisina lundbecki sp. nov. (Figure 6 (a – d)) Artemisina apollinis : Lundbeck 1905, p. 114 – 116, pl. XIII, figs 4a – g; Hentschel 1929, p. 876, 939; Koltun 1966, p. 140 – 141, fig. 97 Material examined The holotype was collected at the north-eastern part of the Laptev Sea (77.76°N, 131.86° E); deposited in the Edward Eversman Zoology Museum (identification number 2.2.8.442). Paratype locality same as holotype locality (78.05°N, 133.41°E). Description Sponge of cup- or fan-like shape, up to 4.5 cm in height. Surface coarse-pored, slightly setose. Circular oscules about 2 mm in diameter scattered over the surface. The dermal membrane is a thin, translucent film. The consistency is soft, loose and quite fragile. Both examined specimens possess gemmules of roundish and slightly flattened shape (up to 650 µm in diameter), distributed throughout the interior. Colour from light to dark brown. Skeleton The main skeleton consists of multispicular, longitudinal tracts and disorderly scattered single spicules. The dermal skeleton is composed of a layer of small styles, lying more or less tangentially. Spicules (Figure 6 (a – d)). Large choanosomal styles, slightly curved and spined at the basal end, dimensions: 548.6 – 658.8 – 782.9 ( n = 20) × 12 – 16.5 – 20 ( n = 15) µm; small dermal styles straight, roughly spined at the basal end, dimensions: 310 – 434.5 – 487.2 ( n = 15) × 5.15 – 7.4 – 8.7 ( n = 15) µm; toxa (fully developed) with spined ends: 279 – 409 – 498.6 ( n = 10) × 3.8 – 5 – 5.7 ( n = 10) µm; palmate isochelae: 12.7 – 14.7 – 16.2 ( n = 10) µm. Etymology The species is named in honour of William Lundbeck, a Danish zoologist, whose brilliant monographs on sponges have remained a model of systematic description to be followed. Remarks The term ‘ bipolar ’ usually refers to a species found in both the Northern and Southern hemispheres, with a gap in distribution at lower latitudes (i.e. in temperate and tropical waters). Numerous hypotheses for this distribution have been proposed (see Ekman 1953). As Bergh ...