Terebellides sp. 1

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

Terebellides sp. 1 Figs 1 , 2 , 9 , 13 ; Table 1; Suppl. material 1: Table S1; Suppl. material 2: Table S2

Species 12 - Nygren et al. 2018: 18-22, figs 5, 6, 10.

Material examined.

4 specimens. Skagerrak. GNM 14630-4; GNM 14630-8.

Remarks.

This species will be described elsewhere by D. Gaeva and I. Jirkov (pers. comm.). In order to confirm characters here used to link species within each subgroup, two specimens were examined under the SEM that share with subgroup A1 the following features: branchiae type 1 sensu Parapar et al. (2016c) (Fig. 13A ), lack of papillae on border of branchial lamellae (Fig. 13B ), geniculate chaetae on TC6, ciliated papilla dorsal to thoracic notopodia (Fig. 13C, D ), and thoracic uncini of type 3 (Fig. 13E ). Nevertheless, abdominal uncini are of type 2 (Fig. 13F ), as it occurs in T. stroemii and differently to T. bakkeni sp. nov. and T. kongsrudi sp. nov., that are the most similar species within subgroup A1 (Table 1 ).

Figures

Figure 1. Phylogenetic tree after Maximum Likelihood analyses on a concatenated dataset of cox 1, 16 S rDNA, ITS 2, and 28 S rDNA (as in Nygren et al. 2018). Bootstrap support values above nodes. Coloured squares indicate the major clades referred herein as Groups A-D. Within Group A, the focus of present study, subgroups A 1 - A 4 and species 6 - 13, 18 - 21, 23, 28 are labelled.

Figure 2. Phylogenetic tree after Maximum Likelihood analyses on a dataset of cox 1 (including all sequences in Nygren et al. 2018 and in Lavesque et al. 2019). Bootstrap support values above nodes. Species other than members of Group A are collapsed. Species with names refer to those dealt with in present study.

Figure 9. Bathymetric distribution of Terebellides species studied in this work. Subgroups (A 1 - 3) within group A sensu Nygren et al. (2018) are indicated.

Figure 13. Terebellides sp. 1 (species 12; GNM 14630 - 4 and GNM 14640 - 8), SEM micrographs. A anterior end, right lateral view B detail of anterior branchial lamellae C TC 16 D notopodial papilla E thoracic uncini F abdominal uncini. Abbreviations: abl - anterior branchial lobe; bdl - branchial dorsal lobe; bvltp - branchial ventral lobe terminal papilla; TC - thoracic chaetiger; tdp - thoracic dorsal papilla; tll - thoracic lateral lobes.