Terebellides sp. 2
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https://dx.doi.org/10.3897/zookeys.992.55977 |
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lsid:zoobank.org:pub:0F038B5B-120E-4583-8E85-4092C9798566 |
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https://treatment.plazi.org/id/9FDD6827-E227-5DDE-8EA6-8CBEAE070DE2 |
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scientific name |
Terebellides sp. 2 |
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Terebellides sp. 2 View in CoL Figs 1 View Figure 1 , 2 View Figure 2 , 9 View Figure 9 , 27 View Figure 27 ; Table 1; Suppl. material 1: Table S1; Suppl. material 2: Table S2
Species 21 Nygren et al. 2018: 18-22, figs 5, 6, 10.
Material examined.
4 specimens: Barents Sea. ZMBN 116481; ZMBN 116486.
Remarks.
As explained for Terebellides sp. 1, two specimens were examined under SEM; these share with T. bigeniculatus the irregular shape of branchial lobes (Fig. 27A View Figure 27 ), the presence of geniculate chaetae on TC5 and TC6 (Fig. 27C-E View Figure 27 ) and abdominal uncini of type 1B (Fig. 27G View Figure 27 ). They share with subgroup A1 the presence of one ciliated papilla dorsal to thoracic notopodium (Fig. 27B View Figure 27 ) and thoracic uncini of type 3 (Fig. 27F View Figure 27 ).
On the other hand, species 18 and 19 of A1 (not described here because of the few specimens being available) and 23 (A4) have a geographic distribution similar to that of T. bigeniculatus but their position in the cladogram by Nygren et al. (2018: fig. 5) suggests that they may not bear geniculate chaetae in two chaetigers.
There are no unique diagnostic nucleotide positions that are shared by the two haplotypes (in 18 sequences) in COI. Eighteen sequences, in one single haplotype, have been attributed to this species ( Nygren et al. 2018). Members of this species show a minimum of 3.0% uncorrected genetic distance, with its closest relative being T. bigeniculatus (Fig. 1 View Figure 1 ).
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