Terebellides ronningae, Parapar & Capa & Nygren & Moreira, 2020

Parapar, Julio, Capa, Maria, Nygren, Arne & Moreira, Juan, 2020, To name but a few: descriptions of five new species of Terebellides (Annelida, Trichobranchidae) from the North East Atlantic, ZooKeys 992, pp. 1-58 : 1

publication ID	https://dx.doi.org/10.3897/zookeys.992.55977
publication LSID	lsid:zoobank.org:pub:0F038B5B-120E-4583-8E85-4092C9798566
persistent identifier	https://treatment.plazi.org/id/7A447FDE-5934-483F-95F3-D178A0857A4A
taxon LSID	lsid:zoobank.org:act:7A447FDE-5934-483F-95F3-D178A0857A4A
treatment provided by	ZooKeys by Pensoft
scientific name	Terebellides ronningae
status	sp. nov.

Treatment

Terebellides ronningae sp. nov. Figs 1 View Figure 1 , 2 View Figure 2 , 3F View Figure 3 , 9 View Figure 9 , 10 View Figure 10 , 14B View Figure 14 , 17D View Figure 17 , 18B View Figure 18 , 19B View Figure 19 , 20 View Figure 20 , 21 View Figure 21 , 28C View Figure 28 ; Table 1; Suppl. material 1: Table S1; Suppl. material 2: Table S2

Species 7 - Nygren et al. 2018: 18-22, figs 5, 6, 10, Suppl. material 1: Table S1.

M aterial examined.

Type material. Holotype: ZMBN116357. Paratypes (8 specs): Norwegian coast (ZMBN 116350, ZMBN 116352, ZMBN 116353, ZMBN 116354, ZMBN 116355, ZMBN 116356, ZMBN 116358, ZMBN 116359); Skagerrak (ZMBN 116348, ZMBN 116349).

Holotype. Complete specimen, 19.0 mm long and 2.0 mm width (Figs 3F View Figure 3 , 19B View Figure 19 ).

GenBank accession numbers of material examined (COI).

Holotype: MG025114; Paratypes: MG025105, MG025106, MG025107, MG025109, MG025110, MG025111, MG025112, MG025113, MG025115, MG025116. Additional material: MG025108,

Diagnostic features of type material.

Complete individuals ranging from 12.0-35.0 mm in length and 1.5-3.0 mm in width (Fig. 17D View Figure 17 ). Branchial dorsal lobes lamellae with poorly-developed anterior papillary projections (Fig. 20C View Figure 20 ). Ventral branchial lobes hidden (Fig. 20A View Figure 20 ) or not (Figs 3F View Figure 3 , 19B View Figure 19 ) by dorsal ones. Lateral lappets and dorsal projection ill-defined, only slightly developed on TC2 (Fig. 20A View Figure 20 ). Geniculate chaetae acutely bent (Fig. 21A, B View Figure 21 ) and with very low capitium. Ciliated papilla dorsal to thoracic notopodia not observed. Thoracic uncini in one row with rostrum/capitium length ratio of approximately 2: 1, and capitium with a first row of four or five (sometimes six) large-sized teeth, followed by several progressively smaller teeth (Fig. 21C-E View Figure 21 ). Abdomen with 24-35 uncinigers with type 2 uncini (Figs 21F View Figure 21 , 28C View Figure 28 ).

Nucleotide diagnostic features.

All sequences of T. ronningae sp. nov. share the unique apomorphic nucleotides in positions 129 (G), 399 (G) and 435 (G).

Type locality.

Hordaland, Lysefjord (Norway); 25-47 m deep (Figs 10 View Figure 10 , 18B View Figure 18 ).

Distribution and bathymetry.

Norwegian coast and shelf, Skagerrak; 25-188 m deep ( Nygren et al. 2018) (Figs 9 View Figure 9 , 18B View Figure 18 ; Suppl. material 1: Table S1).

Etymology.

This species is named after Dr. Ann-Helén Rønning, Head Engineer of the Department of Technical and Scientific Conservation, Natural History Museum-NHMO (Oslo), for her help and friendship.

Remarks.

Terebellides ronningae sp. nov. is characterised by the lack of ciliated papilla dorsal to thoracic notopodia and the presence of papillary projections pointing over the edge of the dorsal anterior border of branchial lamellae, thoracic uncini of type 1 and abdominal of type 2 (Table 1 View Table 1 ). It is distinguished from the closest relatives of subgroup A2 by the presence of thoracic uncini type 1 instead of type 3 (Table 1 View Table 1 ).

Specimens examined with SEM bear thoracic uncini with rostrum bendings (Fig. 21C View Figure 21 ) similar to those of other NEA species (see Discussion for T. stroemii ). The branchial ventral lobes show variability in their arrangement that is similar to that of T. europaea .

Twelve sequences (see Suppl. material 2: Table S2), in ten haplotypes, have been attributed to this species ( Nygren et al. 2018). They show 0-0.6% intraspecific divergence, and a minimum of 8.8% uncorrected genetic distance, its closest relative being T. europaea (Fig. 2 View Figure 2 ).