Laubieropsis norvegica Zhadan & Atroshchenko, 2012

Salazar-Vallejo, Sergio I., Zhadan, Anna E. & Rizzo, Alexandra E., 2019, Revision of Fauveliopsidae Hartman, 1971 (Annelida, Sedentaria), Zootaxa 4637 (1), pp. 1-67 : 56

Laubieropsis norvegica Zhadan & Atroshchenko, 2012

Laubieriopsis norvegica Zhadan & Atroshchenko, 2012:3–9 , Figs. 2–4 .

TL: Norway, North Sea , 340 m , mud. D: Northeastern North Sea , 300–350 m depth .

Diagnosis. Laubieriopsis with 22 chaetigers. Anterior and posterior segments entire, not annulated. First 4 anterior parapodia with sigmoid aciculars, neurochaetae often bidentate. Median and posterior parapodia without aciculars, one capillary, sometimes a smaller one. Genital papillae paired in posterior area of chaetiger 8. Last chaetiger with one thick acicular notochaetae and three capillary neurochaetae, barely overpassing pygidium.

Remarks. Laubieriopsis norvegica resembles L. cabiochi because they have a similar number of chaetigers and in their anterior chaetigers there are bidentate aciculars, but their main difference is the type of genital papillae (GP). In L. norvegica , the GP are paired, whereas they are single in L. cabiochi .

Laubieriopsis norvegica differs from all species of the Fauveliopsidae by the highly reduced chaetal bunds in median and posterior parapodia. Whereas all fauveliopsid species have one, rarely two aciculars in each parapodial ramus, noto- and neuropodia of chaetigers 5–21 in L. norvegica bear one fine, slender capillary and one even smaller chaeta which may be absent.

Figures

FIGURE 2. Fauveliopsis armata Fauchald & Hancock, 1981, paratypes (LACM 1161). A. Methyl green stained, dorsal view, stereoscope. B. Same, dorsal view, compound microscope. C. Same, right side of anterior end. D. Same, posterior end, dorsal view. Scale bars: A, B: 250 µm, C: 60 µm, D: 80 µm.

FIGURE 3. Fauveliopsis brattegardi Fauchald, 1972a, holotype (ZMUB 52205). A. Dorsal view. B. Oblique, dorsal view. C. Anterior end, oblique dorsal view. D. Posterior end, dorsal view. Scale bars: A, B: 160 µm, C: 45 µm, D: 65 µm.

FIGURE 4. Fauveliopsis brevipodus Hartman, 1971, n. comb., holotype (USNM 55546), A. Dorsal view. B. Anterior region, dorsal view. C. Posterior region, dorsal view. Paratypes (USNM 55547). D. Oblique dorsal view. E. Dorsal view. Scale bars: A: 260 µm, B: 100 µm, C: 90 µm, D, E: 0.4 mm.