OCCASIONAL PAPERS OF THE California Academy of Sciences No. 70, 3 pages, 2 figures, 1 table. September 25, 1968 Extension of Range for Balanus tintinnabulum calif ornicus Pilsbry, 1916 (Cirripedia, Thoracica) By Victor A. Zullo California Academy of Sciences SAN FRANCISCO PUBLISHED BY THE ACADEMY 1968 f^' ( LIBRARY 1>'1 OCCASIONAL PAPERS V^' , A-/ \ ''ASS OF THE \ยป ,v CALIFORNIA ACADEMY OF SCIENCES No. 70, 3 pages, 2 figures, 1 table. September 25, I9(i8 Extension of Range for Balanus tintinnabulum calif ornicus Pilsbry, 1916 (Cirripedia, Thoracica) By Victor A. Zullo California Academy of Sciences Abstract: The northern limit of Balanus tintinnabulum californicus Pilsbry, 1916, previously recognized as San Francisco, California, is extended northward about 429 kilometers to Humboldt Bay, California. Balanus tintinnabulum californicus Pilsbry, 1916, previously known to range from the Gulf of California north to San Francisco, Cahfornia (Henry, 1960), is represented in the collection of the California Academy of Sciences (CAS) by specimens from four localities between San Francisco and Eureka, California (table 1; figs. 1, 2). The specimens from Mendocino and Humboldt coun- ties were taken from navigational buoys serviced by the USS Lupine in 1939, and were presented to the late Frank L. Rogers for identification. Additional material was collected both by F. L. Rogers and me from shore localities along the Marin and Sonoma County coasts. These new records extend the range of this subspecies about 429 kilometers to the north. Balanus nubilus Darwin, 1854 was the most abundant barnacle on the buoys, except in Humboldt Bay (CAS loc. 29692) where B. crenatus Bruguiere, 1789 was also found in large numbers. The few individuals of B. tintinnabulum californicus obtained might indicate that their presence was fortuitous, and related to abnormal, short-term conditions that allowed settlement and growth during the 1939 season. However, two lines of evidence suggest that the north- ern California coast is part of the established range of this subspecies. Haderlie (1968, pp. 335, 337; table 3) in a study of settlement and growth of fouling organisms on test panels in Monterey Harbor, found that B. CALIFORNIA ACADEMY OF SCIENCES rOcc. Papers 1 2 Figure 1. Balanus tintinnabuUim calif ornicus Pilsbry (center) with B. nubilus Darwin. Rodgers Break buoy, Humboldt County (CAS loc. 33294), carinorostral diameter of orifice 13.5 mm. Figure 2. Balanus tinlinnabuliim californicus Pilsbry with B. crenatus attached. Hum- boldt Bay buoy, Humboldt County (CAS loc. 29692), carinorostral diameter of orifice 16.4 mm. tmtinnabulmn californicus did not settle on panels exposed for three months or less, but was present on panels exposed between six and twelve months. He concluded that this barnacle might require the presence of an established biota before settlement could take place. According to F. L. Rogers' notes, the buoys tended by the USS Lupine were hauled and cleaned about four times a year. Extrapolation of the settling data from Monterey Harbor could thus explain the low frequency of B. tintinnabidum californicus on these buoys. A single specimen of B. tintinnabulum californicus has also been found in Table 1. Northern California localities of Balanus tintinnabulum californicus Pilsbry. CAS locality no. Locality Collector Specimens 40767 Bolinas, Marin County F. L. Rogers 1, beach worn 40766 Carmet Beach, Sonoma County V. Zullo, 1, low Feb. 3, 1962 intertidal 29689 Albion whistle buoy, off D. H. Heagerty, (see note entrance to Albion River, USS Lupine, 1939 below) Mendocino County 33294 Buoy off Rodgers Break, near D. H. Heagerty, 1 Punta Gorda, Humboldt County USS Lupine, 1939 29692 Buoys in Humboldt Bay, D. H. Heagerty, 2 (1 dead) Humboldt County USS Lupine, 1939 NOTE: The specimens recorded by F. L. Rogers from this locaUty could not be found. No. 70] ZULLO: RAXGE EXTENSIOX OF BALA.WS TINTIX S Mil LVM 3 a late Pliocene deposit at INIoonstone Beach in the Eureka area (University of California Museum of Paleontology, Berkeley, loc. B-7346). The large and diverse invertebrate fauna of this locality is composed predominantly of extant species that indicate hydroclimatic conditions not unlike those presently found off the coast at Eureka. Initially, this fossil occurrence in association with a cool temperate fauna so far to the north of the presumed northern limits of the subspecies was difficult to interpret. However, the Recent records now available serve to resolve this problem, and, conversely, the late Pliocene record suggests that the northern range of B. tintinnabidum californicus has long been established. REFERENCES CITED Haderlie, E. C. 1968. Marine fouling and boring organisms in Monterey Harbor. The Veliger, vol. 10, no. 4, pp. 327-341, figs. 1-3, pi. 49. Henry, D. P. 1960. Thoracic Cirripedia of the Gulf of California. University of Washington Publica- tions in Oceanography, vol. 4, no. 4, pp. 135-158, pis. 1-5. ! iSRARY 5 ' /"SS- sf/ V ' " '' \'