Scientific name	Latitude	Longitude	Year	Month	Basis of record	Dataset	Institution code	Collection code	Locality
Cyclocardia Conrad, 1867	-54.785	-64.7017	1971	4	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Staten Island, Le Maire Strait
Cyclocardia astartoides (Martens, 1878)	-56.325	-27.475	1966	3	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Visokoi Island, east of islands
Cyclocardia astartoides (Martens, 1878)	-53.6	-36.875	1963	9	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Georgia Island, north of island
Cyclocardia astartoides (Martens, 1878)	-66.3567	-66.7725	1973	3	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Antarctic Peninsula, Biscoe Islands, Lavoisier Island, Matha Strait, east SE of Island
Astarte longirostra d'Orbigny, 1842	-62.94	-60.8217	1972	1	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Shetland Islands, Deception Island
Cyclocardia astartoides (Martens, 1878)	-73.092	174.033	1968	1	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Victoria Land
Astarte longirostra d'Orbigny, 1842	-62.9767	-60.8117	1972	1	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Shetland Islands, Deception Island
Cyclocardia astartoides (Martens, 1878)	-62.295	-58.5767	1971	12	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Shetland Islands, King George Island, Stranger Point
Cyclocardia astartoides (Martens, 1878)	-54.0933	-36.5133	1975	5	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Georgia Island
Astarte longirostra d'Orbigny, 1842	-52.933	-75.0	1964	2	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Strait Of Magellan
Cyclocardia astartoides (Martens, 1878)	-64.3129	-62.9722	1982	3	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Antarctic Peninsula, Palmer Archipelago, Melchior Island
Cyclocardia astartoides (Martens, 1878)	-62.3433	-58.7717	1972	1	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Shetland Islands, Nelson Island
Carditella naviformis (Reeve, 1843)	-55.825	-66.342	1962	9	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Cape Horn
Carditopsis flabellum (Reeve, 1843)	-54.7783	-64.6933	1971	10	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Le Maire Strait
Cyclocardia astartoides (Martens, 1878)	-61.417	-41.917	1964	4	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Scotia Ridge, SE of South Orkney Islands
Cyclocardia astartoides (Martens, 1878)	-54.36	-35.9783	1975	5	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Georgia Island
Cyclocardia astartoides (Martens, 1878)	-54.85	-35.63	1986	12	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	South Georgia Island
Carditopsis flabellum malvinae (d'Orbigny, 1845)	-54.958	-65.075	1964	2	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Strait Of Le Maire
Carditopsis flabellum malvinae (d'Orbigny, 1845)	-54.958	-65.075	1964	2	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	Strait Of Le Maire
Cyclocardia velutina (E.A.Smith, 1881)	-52.533	-63.883	1964	2	preserved specimen	NMNH Extant Specimen Records	USNM	Invertebrate Zoology	between Argentina and Falkland Islands