Terebellides

Parapar, Julio, Martin, Daniel & Moreira, Juan, 2020, On the diversity of Terebellides (Annelida, Trichobranchidae) in West Africa, seven new species and the redescription of T. africana Augener, 1918 stat. prom., Zootaxa 4771 (1), pp. 1-61: 55-56

publication ID

https://doi.org/10.11646/zootaxa.4771.1.1

publication LSID

lsid:zoobank.org:pub:A46FAF72-6F95-4DA3-A41D-FE770D6EDF1F

DOI

http://doi.org/10.5281/zenodo.3816137

persistent identifier

http://treatment.plazi.org/id/03BF4239-FFC3-FFFE-EAF8-C00F9DD4FC7C

treatment provided by

Plazi

scientific name

Terebellides
status

 

Key to intertropical South Atlantic species of Terebellides 

The following key comprises the eight species described here, together with those previously described or recorded from Western Atlantic ( Williams, 1984; Solís-Weiss et al., 1991; Garraffoni & Lana, 2003; Díaz-Díaz & Liñero- Arana, 2003), Caribbean Sea ( Williams, 1984) and southern Brazil ( Bremec & Elías, 1999; Garraffoni & Lana, 2003; Schüller & Hutchings, 2012). No material of these species was examined; characters were obtained from bibliography. It is mostly based on branchial characters, number of thoracic chaetigers and location of geniculate chaetae, but also on the thoracic colouration, presence of dorsal hump, and length of thoracic notochaetae.

Terebellides banalis Schüller & Hutchings, 2012  and Terebellides bulbosa Schüller & Hutchings, 2012  are not considered here because the original descriptions do not provide detailed information on branchiae. In T. banalis  , only one type specimen has branchiae, consisting of a stout stem with four very small and stout branchial lobes ( Schüller & Hutchings, 2012: Fig. 7AView FIGURE 7, 8BView FIGURE 8), suggesting it may be a juvenile. The species is characterized by having well-developed S2, ventrally wider than S3 (TC1), and by TC6 cane-shaped geniculate chaetae ( Schüller & Hutchings, 2012: Fig. 8EView FIGURE 8). Terebellides bulbosa  bears a branchial stem lacking well defined lobes and shows very large lappets in the first four chaetigers, followed by a series of laterally expanded segments before a typical Terebellides  - like posterior thorax ( Schüller & Hutchings, 2012: Fig. 10View FIGURE 10).

1. First unciniger in TC5; 17 or 18 thoracic uncinigers.......................................................... 2

- First unciniger in TC6; 18 thoracic uncinigers............................................................... 3

2. 17 thoracic uncinigers............................................................. T. anguicomus Müller, 1858 

- 18 thoracic uncinigers....................................................... T. crux Schüller & Hutchings, 2013 

3. Anterior dorsum with a distinct hump on TC7............................................................... 4

- Anterior dorsum smoothly curved........................................................................ 5

4. Ventral branchial lobes more slender than dorsal ones; lateral lappets from TC3 to TC5.................................................................................. T. carmenensis Solís-Weiss, Fauchald & Blankensteyn, 1991 

- Both branchial lobes similar in size; lateral lappets from TC5 to TC7..................... T. totae Bremec & Elías, 1999 

5. TC1 to TC5 ventrally whitish ( Fig. 33View FIGURE 33 A–B)........................................... Terebellides ramili  sp. nov.

- TC1 to TC4 similar in colour as following chaetigers......................................................... 6

6. Anterior branchial lobe well developed.................................................................... 7

- Anterior branchial lobe absent or much shorter than posterior lobes............................................. 13

7. Branchial stem long, about as long as posterior dorsal lobes ( Fig. 21AView FIGURE 21)................. Terebellides kirkegaardi  sp. nov.

- Branchial stem much shorter than posterior dorsal lobes....................................................... 8

8. TC1 notopodia and notochaetae much more developed than following........................................... 9

- TC1 notopodia and notochaetae similar to following........................................................ 10

9. Ventral posterior branchial lobes length about 10% of dorsal ones, located after the fusion line of the latter ( Fig. 12AView FIGURE 12, 13AView FIGURE 13)............................................................................ Terebellides congolana  sp. nov.

- Ventral posterior branchial lobes length about 50% of dorsal ones, emerging directly from the branchial stem ( Fig. 12BView FIGURE 12, 16CView FIGURE 16)............................................................................. Terebellides fauveli  sp. nov.

10. Thoracic notochaetae almost as long as thoracic width; TC1 lateral lappet forming a fan-like dorsal expansion ( Fig. 21BView FIGURE 21, 25View FIGURE 25 B–C)..................................................................... Terebellides longiseta  sp. nov.

- Thoracic notochaetae much shorter than thoracic width; TC1 lateral lappet not forming a fan-like dorsal expansion....... 11

11. TC1 notochaetae short, scarce................................. T. lanai Solís-Weiss, Fauchald & Blankensteyn, 1991 

- TC1 notochaetae similar to following ones................................................................ 12

12. 20–26 abdominal chaetigers.......................... Terebellides parvus Solís-Weiss, Fauchald & Blankensteyn, 1991 

- At least 30 abdominal chaetigers...................................................... T. klemani Kinberg, 1867 

13. Branchial lobes neither fused nor comma-shaped........................................................... 14

- Branchial lobes at least partially fused, comma-shaped....................................................... 19

14. Branchial posterior ventral lobes with long terminal filament ( Fig. 28AView FIGURE 28, 30View FIGURE 30 A–B)............. Terebellides nkossa  sp. nov.

- Branchial posterior ventral lobes lacking long terminal filament............................................... 15

15. Anterior thoracic chaetigers narrow, laterally expanded like a partially compressed accordion.................................................................................... Terebellides concertina Schüller & Hutchings, 2012 

- Anterior thoracic chaetigers different..................................................................... 16

16. Lower buccal lip and tentacular membrane greatly expanded.................................................. 17

- Lower buccal lip and tentacular membrane different......................................................... 18

17. Branchial lobes completely free from each other, bearing few and loose lamellae; upper lip of tentacular membrane small................................................................... Terebellides diva Schüller & Hutchings, 2012 Branchial  lobes not fused but well defined, with numerous and well-packed lamellae; upper lip of tentacular membrane much developed ( Fig. 35View FIGURE 35 A–B)................................................................... Terebellides  sp. 1

18. Pygidium with two prominent lateral papillae.......................... Terebellides gingko Schüller & Hutchings, 2012 

- Pygidium lacking papillae......................................... Terebellides sepultura Garraffoni & Lana, 2003 

19. Branchial posterior ventral lobes similar in shape to dorsal ones, about half longer, located at base of dorsal ones ( Fig. 2BView FIGURE 2, 8EView FIGURE 8); thoracic uncini capitium with first row of 5–6 teeth, similar in size to following ones ( Fig. 10View FIGURE 10 A–B)................................................................................................. Terebellides augeneri  sp. nov.

- Branchial posterior ventral lobes much shorter than dorsal ones................................................ 20

20. Branchial posterior ventral lobes near distal end of dorsal ones ( Fig. 2AView FIGURE 2, 4AView FIGURE 4, 5AView FIGURE 5); thoracic uncini capitium with first row of 1–2 teeth, much bigger than following ( Fig. 7AView FIGURE 7).......................... Terebellides africana Augener, 1918  stat. prom.

- Branchial posterior ventral lobes emerging at base of dorsal ones.......... Terebellides malvinensis Bremec & Elías, 1999