Trichobranchidae Malmgren, 1866
Recent taxonomic work revealed many new species of Trichobranchidae (particularly in genus Terebellides Sars, 1835), from worldwide areas (e.g. Hutchings and Peart, 2000; Gagaev, 2009; Parapar et al., 2011; Parapar et al. 2015), including South America and South Atlantic (Bremec and Elias, 1999; Schüller and Hutchings, 2012). Revisionary works clarified the status of Terebellides stroemii (Parapar and Hutchings, 2015) as well as some commonly reported species from the Southern Ocean (Parapar and Moreira, 2008). New characters were identified or gained importance (Hutchings and Peart, 2000). There is therefore up to date taxonomic information available, although new species are likely to be discovered. Falkland Island specimens of Trichobranchidae were sadly often damaged and in bad condition, preventing unambiguous identifications/conclusions. The diversity of this group in Falkland Islands is likely much higher than species reported here, particularly in small-sized species from 1000m depths. The species recorded are summarized in table below.
Overview of Trichobranchidae genera/species collected from Falkland Islands in this study
|
Lower lip |
Form of branchiae |
Form of uncini in 1st thoracic unciniger |
No. of thoracic chaetigers |
Other characters |
|
|
Artacamella sp. 1 |
expanded, forming conical, ridged proboscis |
unknown; 2 pairs (only scars observed) |
long-handled uncini (=same as on subsequent thoracic segments) |
15? |
- |
|
Terebellides sp. 1 |
not expanded |
one large branchia with 4 lobes with transverse lamellae; lobes completely free from each other |
geniculate acicular hooks with shafts sharply bent and acute tips (=different to those in subsequent thoracic segments) |
18 |
lappets on chaetigers 1-4; abdomen robust, only slightly tapering, all abdominal segments short |
|
Terebellides sp. 2 |
not expanded |
one large branchia with anterior pair of lobes large, fused; posterior pair smaller, fusion unknown |
geniculate acicular hooks with shafts sharply bent and acute tips (=different to those in subsequent thoracic segments) |
18 |
lappets on chaetigers 1-5; abdomen narrow, tapering |
|
Terebellides sp. 3 |
not expanded |
one large branchia with anterior pair of lobes large, posterior pair small; all lobes mostly free from each other |
geniculate acicular hooks with shafts sharply bent and acute tips (=different to those in subsequent thoracic segments) |
18 |
lappets on chaetigers 1-5; abdomen narrow, tapering |
REFERENCES:
Bremec, C.S. and Elias, R., 1999. Species of Terebellides from South Atlantic waters off Argentina and Brazil (Polyghaeta: Trichobranchidae). Ophelia, 51(3), pp.177-186.
Gagaev, S.Y., 2009. Terebellides irinae sp. n., a new species of Terebellides (Polychaeta: Terebellidae) from the Arctic Basin. Russian journal of marine biology, 35(6), pp.474-478.
Hutchings, P. and Peart, R., 2000. A revision of the Australian Trichobranchidae (Polychaeta). Invertebrate Systematics, 14(2), pp.225-272.
Parapar, J. and Moreira, J., 2008. Redescription of Terebellides kerguelensis stat. nov.(Polychaeta: Trichobranchidae) from Antarctic and subantarctic waters. Helgoland Marine Research, 62(2), pp.143-152.
Parapar, J. and Moreira, J., 2008. Revision of three species of Terebellides (Polychaeta: Trichobranchidae) described by C. Hessle in 1917 from the Southern Ocean. Journal of Natural History, 42(17-18), pp.1261-1275.
Parapar, J., Moreira, J. and Helgason, G.V., 2011. Taxonomy and distribution of Terebellides (Polychaeta, Trichobranchidae) in Icelandic waters, with the description of a new species. Zootaxa, 2983, pp.1-20.
Parapar, J. and Hutchings, P.A., 2015. Redescription of Terebellides stroemii (Polychaeta, Trichobranchidae) and designation of a neotype. Journal of the Marine Biological Association of the United Kingdom, 95(02), pp.323-337.
Parapar, J., Moreira, J. and O’Reilly, M., 2015. A new species of Terebellides (Polychaeta: Trichobranchidae) from Scottish waters with an insight into branchial morphology. Marine Biodiversity, pp.1-15.
Schüller, M. and Hutchings, P.A., 2012. New species of Terebellides (Polychaeta: Trichobranchidae) indicate long-distance dispersal between western South Atlantic deep-sea basins. Zootaxa, 3254, pp.1-31.
