Appendix. Intertidal locations north of Monterey sampled for the presence of Phidiana hiltoni. For sites north of Coleman Beach, Sonoma County, only surveys after 1992 (when P. hiltoni was first observed at Duxbury Reef) are included. Dates of observations for sites from Coleman Beach south are divided into those pre- and post-arrival of P. hiltoni in the region. Observers, including published records, are followed by dates of observation in parentheses. Observers: BG = Brenna Green, CS = Caroline Schooley, DM = Douglas Mason, ES = Eric Sanford, GM = Gary McDonald, JA = John Albers–Mead, JG = Jeff Goddard, JP = John Pearse, JS = Jackie Sones, MEH = Mary Ellen Hill, RH = Robert J. Hamby, SL = Sarah Lenz, TG = Terry Gosliner, WP = William Pence.

 = positive records; ○ = negative records.

Site / N latitude & W longitude / Observers & dates
Shelter Cove, Point Delgada / 40° 01’ 17”, 124° 04’ 00” / ○ JG (8/04, 7/10)
Glass Beach / 39° 27’ 09”, 123° 48’ 53” / ○ CS & MEH (1995–2002)
Buckhorn Cove / 39° 15’ 33”, 123° 47’ 03” / ○ BG (6/09)
Sea Lion Cove, Point Arena / 38° 56’ 10”, 123° 43’ 45” / ○ JG (4/07)
Salt Point State Park / 38° 33’ 54”, 123° 20’ 00” / ○ JG (7/10)
Stockoff Cove / 38° 32’ 52”, 123° 18’ 09” / ○ JG (7/06)
Coleman Beach / 38° 21’ 47”, 123° 04’ 15” / ○ TG (1–2,5/72, 6/76), TG & JG (1/85) / ○ JG & TG (4/09), JG & BG (3/10), DM & WP (6/10)
Bodega Marine Reserve / 38° 19’ 00”, 123° 04’ 21” / ○ RH (12/61, 7/62, 5/63), TG (7/71, 7/76), Ristau et al. (1978) (1975–78) / ○ JG (8/04, 4/07), JS & ES (7/10)
Bird Rock, Tomales Point / 38° 13’ 48”, 122° 59’ 36” / ○ Gosliner & Williams (1970, 1973) (1966–72)
Lower Drake’s Estero / 38° 02’ 00”, 122° 55’ 43” / ○ JG (7/74, 4/84, 1/85, 6/86) / ○ JG & BG (3/10)
Chimney Rock, Point Reyes / 37° 59’ 25”, 122° 57’ 50” / ○ Gosliner & Williams (1970, 1973) (1966–72), TG (10/85) / ○ JG (7/10)
Palomarin / 37° 55’, 122° 44’ / ○ Gosliner & Williams (1970, 1973) (1966–72)
Bolinas Point / 37° 54’ 12”, 122° 43’ 41” / ○ GM (1/68) /  JG (8/04, 7/06)
Duxbury Reef / 37° 53’ 23”, 122° 41’ 59” / ○ Gosliner & Williams (1970, 1973) (1966–72), JG (1969–75, 12/76), TG (6/76, 6/84, 7/86, 6/87) /  JG & TG (12/92 – present)
Muir Beach / 37° 52’ 22”, 122° 36’ 56” / ○ Jaeckle (1983)
Fitzgerald Marine Reserve (Moss Beach and Frenchman’s Reef) / 37° 31’ 25”, 122° 31’ 06” / ○ Steinberg (1963) (1948–63), Bertsch et al. (1972) (1966–70), TG (6/87) /  SL (11/09 – present)
Pillar Point / 37° 29’ 38”, 122° 29’ 59” / ○ Bertsch et al. (1972) (6/69), GM (1/80, 5/81), DM & WP (9/88–11/90) /  DM & WP (1/91– present), JA (6/07, 8, 11/08)
Pescadero State Beach / 37° 15’ 41”, 122° 24’ 54” / ○ Bertsch et al. (1972) (1966–69)
Pebble Beach / 37° 14’ 00”, 122° 24’ 57” / ○ Bertsch et al. (1972) (1–4/70)
Bean Hollow State Beach / 37° 13’ 34”, 122° 24’ 40” /  JA (7/06), BG (1–2/09)
Pigeon Point North / 37° 11’ 03”, 122° 23’ 45” / ○ JP (1971–73) / ○ JP (1996–97)
Pigeon Point South / 37° 10’ 57”, 122° 23’ 22” / ○ GM (12/70, 1/72, 11–12/75, 12/78), JP (1971–73) / ○ JP (1996–97), GM (12/07–1/09)
Ano Nuevo Point / 37° 06’ 43”, 122° 19’ 41” / ○ JP (1971–73) / ○ JP (1996–97)
Ano Nuevo Cove / 37° 06’ 51”, 122° 19’ 31” / ○ JP (1971–73) /  JP (1996–97)
Scott Creek, north / 37° 02’ 45”, 122° 14’ 17” / ○ JG (6/75–10/77) /  JG (11/77–present), GM (4/78)
Scott Creek / 37° 02’ 32”, 122° 14’ 00” / ○ JP (1971–73) /  JP (1996–97)
Davenport Landing / 37° 01’ 21”, 122° 12’ 56” / ○ JP (1971–73) / ○ JP (1996–97)
Natural Bridges / 36° 56’ 56”, 122° 03’ 43” / ○ JP (1971–73) / ○ JP (1996–97)
Almar Ave / 36° 57’ 04”, 122° 02’ 34” / ○ JP (1971–73) / ○ JP (1996–97)
Santa Cruz Point East / 36° 57’ 07”, 122° 01’ 33” / ○ JP (1971–73) /  JP (1996–97)
Soquel Point / 36° 57’ 18”, 121° 58’ 16” / ○ JP (1971–73) /  JP (1996–97), BG & GM (12/09)

References

Bertsch H, Gosliner T, Wharton R, Williams G (1972) Natural history and occurrence of opisthobranch gastropods from the open coast of San Mateo County, California. Veliger 14: 302-314

Gosliner TM, Williams GC (1970) The opisthobranchs of Marin County, California. Veliger 13: 175-180

Gosliner TM, Williams GC (1973) Additions to the opisthobranch mollusk fauna of Marin County, California, with notes on their natural history. Veliger 15: 352-354

Jaeckle WB (1983) Additions to the opisthobranch mollusk fauna of Marin County, California, with notes on the biology of certain species. Veliger 26:93-95

Ristau DA, Tarp C, Hand C (1978) Survey of the biota of the open coast at Bodega Marine Life Refuge (Area of Special Biological Significance): a report to the California State Department of Fish and Game. Cadet Hand Library, Bodega Marine Laboratory.

Steinberg JE (1963) Notes on the opisthobranchs of the west coast of North America – IV. A distributional list of opisthobranchs from Point Conception to Vancouver Island. Veliger 6:68-73