Ampharetidae Malmgren, 1866  

Overview of species in family Ampharetidae collected from the Falkland Islands in this study have been split into 3 tables below.  Key given in Reuscher et al. (2009) was used to determine generic identifications (different taxonomic source may lead to different idenitifications). For simplicity, all posterior body segments bearing uncini, but lacking notopodia and/or notochaetae are considered abdominal uncinigers (in contrast, Imajima et al. (2012) suggested that segments which lack notopodia but have neuropodia shaped as in thoracic uncinigers are considered intermediate uncinigers and excluded from the count of abdominal uncinigers).

Table. 1 Characters in species of subfamily Ampharetinae with paleae present found in this study (Key: TC-thoracic chaetigers, TU-thoracic uncinigers, AU-abdominal uncinigers)

Species Subfamily  Ampharetinae	No. of TC + paleae	No. of TU	No. of AU	Paleae (form)	No. of branchial pairs	Arrangement of branchiae (each side)	Shifted notopodia	Other diagnostic character/s
Anobothrus sp. 1	14 +P	12	12	Stout gradually tapering into thin tips	4	3+1;  separated by a narrow gap	slightly on TU-8, connected by ridge	circular band present on TU-2
Anobothrus cf. glandularis	14 +P	12	13	Thin with very long tips, increasing in size, shorter to about the same length as notochaetae	4	3 on a raised ridge + 1	slightly on TU-8, connected by ridge	circular band  present on TU-3
Eclysippe sp. 1	15 +P	12	12	Thin, long reaching the anterior end of prostomium	3	in one row on raised ridge	-	posterior thoracic chaetigers elongated, margin of lower mouth
Lysippe sp. 1	16 +P	13	12	small, thin	4	arranged on a raised ridge	-	margin of lower lip crenulated, body slender
Lysippe sp. 2	16 +P	13	>9	small, thin	4	arranged on a raised ridge	-	margin of lower lip crenulated, body inflated, prostomium with pigmented spots
Lysippe cf. fragilis	17+P	14	8	small, thin	4	3+1; separated by a small gap	-	with large brown patches on prostomium
Ampharete sp. 1	14 +P	12	13	stout rapidly tapering into very thin, long tip; long, reaching the anterior end of prostomium	4	3+1;  well separated by a gap	-	buccal tentacles papillose; AU 1-5 with dorsal cirri (most prominent in AU 2-5)
Amphicteis sp. 1	17+P	14	15	extremely long, stout gradually tapering into thin tips	4	2+2; separated by a small gap	-	with prostomial glandular ridges; with rudimentary abdominal notopodia
Tanseimaruana sp. 1	17+P	14	?	long, slender gradually tapering into thin tips	4	arranged on a raised ridge	-	first abdominal unciniger with 4 dorsal foliose lobes
Eusamythella sexdentata	14+P	12	15	stout, distally strongly bent and tapering into acute tip	3	1+2; separated by a gap	-	raised dorsal ridge on TU-2

 

Table. 2 Characters in species of subfamily Ampharetinae without paleae found in this study (Key: TC-thoracic chaetigers, TU-thoracic uncinigers, AU-abdominal uncinigers, ? marks missing information for respective character)

Species Subfamily Ampharetinae	No. of TC	No. of TU	No. of AU	No. of branchial pairs	Arrangement of branchiae	Other diagnostic character/s
Amage sculpta	14	11	10	4	2+1+1; separated by a wide gap	rudimentary abdominal notopodia present
Samytha sp. 1	17	14	11?	3	2+1; separated by a small gap	crenulated lower lip
Glyphanostomum sp. 1	14	11	24	3	1+2; well separated by a gap	prostomium appears hood-like; posterior thoracic chaetigers elongated; tube annulated
Samythella sp. 1	15	12	27	3	in one row on raised ridge	Indistinct dorsal ridge on TC 3; with papilla-like notopodia in abdomen
Samythella sp. 2	15	12	17	3	in one row on raised ridge	with papilla-like notopodia in abdomen

Table 3.  Characters of species of subfamily Melinninae found in this study.

	Body width (mm)	Prostomium	Serration on dorsal membrane	Form of thoracic uncini	Tube
Melinna arnaudi	1.8	wide lobe, no eyes	5-7; sharp, triangular	4 teeth in single vertical  row (formula: 1-1-1-1)	fine mud, sparsely ornamented with larger particles or shell fragments
Melinna sp. 1	0.8	square shaped, anteriorly slightly concave, with many pigmented eyespots	10, blunt, subtriangular	3 teeth in a single row plus 2 smaller teeth distally (formula: 1-1-1-2)	Thin layer of mud, with dense coverage of small particles

REFERENCES

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Jirkov, I.A. (2008). Revision of Ampharetidae (Polychaeta) with modified thoracic notopodia. Invertebrate Zoology, 5(2), pp.111-132.                                                                                    

Jirkov. I. A. (2011). Discussion of taxonomic characters and classification of Ampharetidae (Polychaeta), Italian Journal of Zoology, 78:sup1, 78-94, DOI:10.1080/11250003.2011.617216

Parapar, Julio and San Martin, G. (1997). 'Sedentary' polychaetes of the Livingston Island shelf (South Shetlands, Antarctica), with the description of a new species. Polar Biology. 17(6): 502-514

Reuscher, M., Fiege, D., & Wehe, T. (2009). Four new species of Ampharetidae (Annelida: Polychaeta) from Pacific hot vents and cold seeps, with a key and synoptic table of characters for all genera. Zootaxa, 2191, 1-40.