Leucia nivea ( M. Sars, 1863 )

Barnich, Ruth & Fiege, Dieter, 2010, On the distinction of Harmothoe globifera (G. O. Sars, 1873) and some other easily confused polynoids in the NE Atlantic, with the description of a new species of Acanthicolepis Norman in McIntosh, 1900 (Polychaeta, Polynoidae), Zootaxa 2525, pp. 1-18 : 11-13

publication ID

https://doi.org/ 10.5281/zenodo.196399

DOI

https://doi.org/10.5281/zenodo.6210062

persistent identifier

https://treatment.plazi.org/id/A04A87E7-4710-FF8C-FF5A-CA2B42C03657

treatment provided by

Plazi

scientific name

Leucia nivea ( M. Sars, 1863 )
status

 

Leucia nivea ( M. Sars, 1863) View in CoL

( Fig. 4 View FIGURE 4 A–I)

Polynoe nivea M. Sars, 1863: 291 View in CoL .

Leucia nivea: Chambers (1989) View in CoL : 145, fig. 1; Loshamn (1980, unpubl. thesis): 97 fig. 48. Polynoe zonata Langerhans, 1880: 275 View in CoL .

Harmothoe echinopustulata Fauvel, 1913: 19 View in CoL ; Fauvel (1914): 58, pl. 4 figs. 7–10, 21–26. (for extended synonymy see Chambers 1989)

Type material. Polynoe nivea : holotype, ZMO C3156a (fragmented; elytra all missing) and ZMO C 3156b (slide with parapodium), NE Atlantic, Norway, Trondheimsfjord, Beian, 30–40 fathoms.

Additional material. 3 spms. (cs), VM 23936, NE Atlantic, Norway, Trondheimsfjord, Nr. 45. 1 spm. (cs), VM 23937, NE Atlantic, Norway, Røberg, 10 May 1950, 130– 250 m, coral ground, leg. Sievertsen. 1 spm. (cs), VM 23938, NE Atlantic, Norway, Fenrissund, 29 June 1971, 30– 50 m, leg. Trondheim Biological Station. 1 spm. (af), VM 23939, NE Atlantic, Norway, Budgrunnen, 4 July 1931, 40 – 60 m, moraine, MS "Gunnerus", leg. Trondheim Biological Station. 1 spm. (cs), VM 23940, NE Atlantic, Norway, Sleppen, Svaerholt, 22 July 1937, 200– 220 m.

Diagnosis. Elytral margin without papillae; anterior half of elytra covered by conical to spine-shaped microtubercles, posterior half by semi-globose, spiny macrotubercles.

Description (based on complete specimen, VM 23936; holotype incomplete). Body with 41 segments. At anterior end ( Fig. 4 View FIGURE 4 A), prostomium bilobed, with distinct cephalic peaks; ceratophore of median antenna in anterior notch, style papillate (tip broken); lateral antennae inserted ventrally, styles missing; anterior pair of eyes situated dorsolaterally at widest part of prostomium, posterior pair dorsally near hind margin of prostomium; palps papillate, tapering.

Tentaculophores inserted laterally to prostomium, each with few notochaetae and a dorsal and ventral tentacular cirrus, styles of cirri papillate, tapering. Second segment with first pair of elytra, biramous parapodia, and long buccal cirri. Following segments with short, tapering, papillate ventral cirri.

Sixteen pairs of elytra, covering dorsum, on segments 2, 4, 5, 7, then on every second segment to 23, 26, 29, 32, 35; last six segments cirrigerous; elytral margin without papillae, anterior half of elytra covered by conical to spine-shaped microtubercles, posterior half covered by semi-globose, spiny macrotubercles ( Fig. 4 View FIGURE 4 B,C). Cirrigerous segments with distinct dorsal tubercles; dorsal cirri with cylindrical cirrophore, style papillate, tapering.

Parapodia biramous; notopodia with elongate acicular lobe; neuropodia with elongate prechaetal acicular lobe with digitiform supra-acicular process; neuropodial postchaetal lobe shorter than prechaetal lobe, rounded; tips of noto- and neuroacicula penetrating epidermis ( Fig. 4 View FIGURE 4 D). Notochaetae stouter than neurochaetae, with distinct rows of spines and blunt tip ( Fig. 4 View FIGURE 4 E,F); neurochaetae with distinct rows of spines, tips mainly bidentate with fragile secondary tooth (often abraded), some lower neurochaetae unidentate ( Fig. 1 View FIGURE 1 G–I).

Measurements. Specimens from Trondheimfjord (VM 23936): cs, L 25 mm, W 6 mm for 41 segments ( Fig. 4 View FIGURE 4 A–I); cs in two fragments, regenerating end, L 25 mm, W 8 mm for 43 segments; af with few posterior segments missing, L 25 mm, W 8 mm for 42 segments.

Remarks. Although the holotype of L. nivea is fragmented with some middle segments and all elytra missing, the original description by M. Sars (1863) is sufficient to allow the correct identification of the species. Leucia nivea was figured by Fauvel (1914) and Chambers (1989), but unfortunately the correct shape of the macrotubercles remained rather difficult to evaluate. Having now studied more material we present here a redescription based on a complete specimen.

Apart from Leucia nivea , there is currently only one more species known in the genus, L. violacea ( Storm, 1879) , which has been redescribed by Fiege & Barnich (2009) and is characterised by its rather indistinct, scattered, conical to mamilliform macrotubercles, while in L. nivea macrotubercles are distinct, semi-globose, spiny mounds.

In the same paper however, characters given for L. nivea have been confused with those of Acanthicolepis zibrowii n. sp. described below. Both species have spiny macrotubercles, but they differ clearly in their shape: in A. zibrowii n. sp. macrotubercles are cylindrical to club-shaped ( Fig. 5 View FIGURE 5 C), while in L. nivea they are comparatively low and semi-globose ( Fig. 4 View FIGURE 4 C). Besides this, they show the typical number of elytra of their respective genus: 16 pairs for Leucia and 18 pairs for Acanthicolepis (see also remarks related to A. zibrowii n. sp. below).

Distribution and habitat. Northeast Atlantic from Norway down to Madeira; on various substrates, including cold-water corals, from 8 to 300 m (see Chambers 1989).

ZMO

Zoology Museum, Oxford University

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Phyllodocida

Family

Polynoidae

Genus

Leucia

Loc

Leucia nivea ( M. Sars, 1863 )

Barnich, Ruth & Fiege, Dieter 2010
2010
Loc

Leucia nivea:

Chambers 1989: 145
Loshamn 1980: 97
Langerhans 1880: 275
1989
Loc

Harmothoe echinopustulata

Fauvel 1914: 58
Fauvel 1913: 19
1913
Loc

Polynoe nivea

Sars 1863: 291
1863
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