Sabellidae Latreille, 1825  

Sabellidae Laterille, 1825

Together with Terebellidae, Sabellidae were the most species rich (and taxonomically challenging!) family collected from Falkland Islands (with S >20). Some genera such as Jasmineira, Euchone and Amphicorina were particularly species rich. Existing descriptions of Sabellidae from the geographical region of interest here are often brief/incomplete and this group would greatly benefit from the revision and re-description of holotypes (where possible) as many characters, particularly those of the branchial crown, have not been discussed by earlier taxonomist. As a result many Sabellidae species were misidentified in the past as some recent provisional work demonstrated, particularly for genus Perkinsiana and related genera (see Knight-Jones, 1983, Giangrande and Gambi, 1997 and Tovar-Hernández et al., 2012 for details). Here we attempt to give a complete description of species collected from Falkland Islands as possible, given constrains of completeness of material and taxonomic expertise. Inevitably, characters derived from the branchial crown were not always possible to determine when the crown was missing. Further, this section of the guide would greatly benefit from the input by sabellid specialists as assignment to some genera is uncertain (denoted by “?”) and interpretation of some characters related to branchial crown can be problematic. Taxonomic key to Sabellidae genera provided by Tovar-Hernández (2010) was used to establish generic identifications. Useful introduction to taxonomic characters of Sabellidae (and Fabriciidae) was provided by Giangrande et al. (2015).

Overview of genera of Sabellidae collected from Falkland Islands in this study.

Genus	Glandular girdle on chaetiger 2 +/-	Form of thoracic uncini/companion chaetae +/-	Diagrammatic form of thoracic uncini/companion chaetae	Form of abdominal uncini	Diagrammatic form of abdominal uncini	Pre-pygidial depression +/-	Other diagnostic character/s
Euchone	present	Acicular/absent		quadrate		present	pre-pygidial depression with wings
Jasmineira	present	acicular/absent		with reduced breast, S-shaped		absent	with typical Jasmineira-abscission zone where branchial crown missing
Claviramus	present	acicular/absent		In this study: similar to Jasmineira		absent	radioles of branchial crown distally with flanges
Amphicorina	present	acicular/absent		rasp-shaped plates		absent	low number of abdominal segments (4 -15)
Myxicola	present	acicular/absent		avicular without handles		absent	abdominal tori forming nearly complete cinctures around the body
Desdemona?	present	acicular/absent		rasp-shaped plates		absent	posterior peristomial ring collar absent; anterior margin of anterior peristomial ring developed ventrally as wide lobe
Perkinsiana	absent	avicular/present		avicular, with handle		absent	large number of abdominal segments, radiolar appendages of dorsal lip prominent
Potamethus	present	avicular (in this study)/present		avicular with handle		absent	posterior peristomial ring distinctly elongate, extending anteriorly beyond collar

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