Terebellides europaea Lavesque, Hutchings, Daffe, Nygren & Londono-Mesa , 2019

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
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treatment provided by	ZooKeys by Pensoft
scientific name	Terebellides europaea Lavesque, Hutchings, Daffe, Nygren & Londono-Mesa , 2019
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Treatment

Terebellides europaea Lavesque, Hutchings, Daffe, Nygren & Londono-Mesa, 2019 View in CoL Figs 1 View Figure 1 , 2 View Figure 2 , 3E View Figure 3 , 9 View Figure 9 , 10 View Figure 10 , 14A View Figure 14 , 15 View Figure 15 , 16 View Figure 16 , 17C View Figure 17 , 18A View Figure 18 , 19A View Figure 19 ; Table 1; Suppl. material 1: Table S1; Suppl. material 2: Table S2

Terebellides europaea Lavesque et al. 2019: 163-165, figs 1, 7, 8.

Species 6 - T. stroemii (non Sars, 1835). Nygren et al. 2018: 18-22, figs 6, 10.

Material examined.

31 specimens: Norwegian coast and shelf (GNM14625, GNM14628, GNM15107, GNM15114, GNM15115, GNM15116, GNM15120, GNM15121, GNM15122, GNM15123, GNM15124, GNM15125, GNM15126, GNM15127, GNM15128, ZMBN116334, ZMBN116335, ZMBN116343, ZMBN116344, ZMBN116346, ZMBN116347); Irish Sea (ZMBN116336, ZMBN116337, ZMBN116338, ZMBN116339, ZMBN116340, ZMBN116341, ZMBN116342).

GenBank accession numbers of material examined (COI).

MG025072, MG025073, MG025074, MG025075, MG025076, MG025077, MG025078, MG025079, MG025080, MG025081, MG025082, MG025083, MG025084, MG025085, MG025086, MG025087, MG025088, MG025089, MG025090, MG025091, MG025092, MG025093, MG025094, MG025095, MG025096, MG025097, MG025098, MG025099, MG025100, MG025101, MG025102, MG025103, MG025104. Paratypes (not examined): MN207179, MN207181. Additional sequences (material not examined): MN207180, MN207182.

Diagnostic features of type material.

Complete individuals ranging from 17.0-46.0 mm in length and 2.0-5.0 mm in width (Fig. 17C View Figure 17 ). Branchial dorsal lobes lamellae provided with well-developed anterior papillary projections (Fig. 15C View Figure 15 ). Ventral branchial lobes normally hidden by dorsal ones (Figs 3E View Figure 3 , 15B View Figure 15 , 19A View Figure 19 ) but sometimes discernible below (Fig. 14A View Figure 14 ). Lateral lappets and dorsal projection on thorax present on TC1-TC4 (Fig. 16A View Figure 16 ) or TC2-TC3 in (Fig. 15A View Figure 15 ). Geniculate chaetae acutely bent (Fig. 16B View Figure 16 ). Ciliated papilla dorsal to thoracic notopodia not observed (Figs 15A View Figure 15 , 16A View Figure 16 ). Thoracic uncini in one or two rows (Fig. 16C View Figure 16 ) with rostrum/capitium length ratio for approximately 2: 1 (Fig. 16D View Figure 16 ), and capitium with a first row of four medium-sized teeth, followed by several smaller teeth. Abdomen with 29-38 uncinigers provided with type 2 uncini (Fig. 16E View Figure 16 ). Epibiont ciliates observed in some specimens (Fig. 16F View Figure 16 ).

Nucleotide diagnostic features.

All sequences belonging to T. europaea share the unique apomorphic nucleotide in position 240 (C) of the alignement.

Type locality.

Bay of Brest (Brittany, France) ( Lavesque et al. 2019).

Distribution and bathymetry.

Bay of Biscay ( Lavesque et al. 2019); Kattegat, Skagerrak, North Sea, Irish Sea, Celtic Sea and Norwegian coast and shelf, 8-173 m deep ( Nygren et al. 2018) (Figs 9 View Figure 9 , 10 View Figure 10 , 18A View Figure 18 ; Suppl. material 1: Table S1). Lavesque et al. (2019) included the Ría de Ferrol (Galicia, NW Spain) as part of the Bay of Biscay, but this locality belongs to the northern Galician Rias that are out of the western limit of this bay.

Remarks.

This species is characterised by the combination of the following features: presence of papillary projections over the edge of the anterior border of dorsal branchial lamellae, lack of ciliated papilla dorsal to thoracic notopodia, thoracic uncini of type 3 and abdominal uncini of type 2. The original description states that body length is less than 17 mm, but maximal length of specimens examined here was up to 46.0 mm. Examination of live and preserved specimens has revealed that the size ratio between the ventral and dorsal branchial lobes is similar in all specimens; however, their arrangement differs among specimens, i.e., the ventral lobes are visible in some while in others are hidden behind the dorsal lobes.

Terebellides europaea was misidentified as T. stroemii by Nygren et al. (2018; species 6) due to their morphological similarities and coexistence near the type locality of the latter (Fig. 9 View Figure 9 ). Nevertheless, Lavesque et al. (2019) found that members of species 6 have papillae on the edge of the dorsal branchial lobes, unlike the neotypes of T. stroemii described by Parapar and Hutchings (2014). Molecular analyses show that the sequences of specimens found in the Bay of Biscay belong to species 6 ( Lavesque et al. 2019); examination of all specimens also confirmed the presence of the aforementioned papillae. Moreover, T. europaea is generally found in bottoms above 100 m deep while T. stroemii is present in deeper environments (>100 m) (Fig. 9 View Figure 9 ).

In the 37 sequences analysed attributed to this species (see Suppl. material 2: Table S2), there were ten haplotypes showing 0-0.8% of intraspecific divergence, and a minimum of 8.8% uncorrected genetic distance with members of the closest relative, T. ronningae sp. nov.