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bishop museum bulletins in cultural and environmental studies

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Carlton & Eldredge — Mar<strong>in</strong>e Bio<strong>in</strong>vasions of Hawai‘i<br />

35<br />

<strong>in</strong>g hydroid as <strong>in</strong>troduced with shipp<strong>in</strong>g. Paulay et al. (2002) treat this species as cryptogenic <strong>in</strong><br />

Guam, while Cranfield et al. (1998) treat it as <strong>in</strong>troduced to New Zeal<strong>and</strong>, with a European orig<strong>in</strong>.<br />

It is reported, with various synonyms, from warm-water seas worldwide (Vervoort, 1968; Cooke,<br />

1975; Cutress, 1977; Gibbons & Ryl<strong>and</strong>, 1989). Cooke (1975) noted that it “is a very cosmopolitan<br />

species found <strong>in</strong> temperate <strong>and</strong> tropical regions of all oceans. It is often found on man-made structures,<br />

although it is also common on mar<strong>in</strong>e angiosperms <strong>in</strong> temperate waters.” Its orig<strong>in</strong> rema<strong>in</strong>s<br />

unknown.<br />

The earliest identified Bishop Museum material is from 1929 from Pearl Harbor. Edmondson<br />

(1933: 23) reported it (as Pennaria tiarella) <strong>in</strong> Pearl Harbor <strong>and</strong> Kāne‘ohe Bay, “attached to stones,<br />

pil<strong>in</strong>gs of old wharves, buoys, <strong>and</strong> other floats.” He noted that it appeared to be identical to the<br />

Atlantic Ocean P. tiarella McCrady “<strong>and</strong> may have been transported to Hawaii on the bottoms of<br />

ships.”<br />

Boone (1938) redescribed P. disticha as a new species, Corydendrium splendidum, from<br />

Kāne‘ohe Bay (synonymized by Cooke, 1977a), collected as a s<strong>in</strong>gle large colony <strong>in</strong> 2 m (“1 fathom”)<br />

of water at low tide, <strong>in</strong> 1928. Edmondson & Ingram (1939) reported it (as Pennaria tiarella)<br />

<strong>in</strong> 1935 <strong>and</strong> subsequent years <strong>in</strong> foul<strong>in</strong>g <strong>in</strong> Kāne‘ohe Bay. Hiatt (1954) noted that “there are certa<strong>in</strong><br />

areas (Pearl Harbor <strong>and</strong> Kaneohe Bay) where a species of Pennaria is found abundantly attached to<br />

almost any solid substrate.” It was further recorded by Evans et al. (1972) from Pearl Harbor (1971,<br />

as Pennaria sp.), by Long (1974) on offshore <strong>and</strong> Pearl Harbor panels (1968–1972), <strong>and</strong> by Brock<br />

(1995) from Pearl Harbor (1993). Cooke (1977a) reported it from Kāne‘ohe Bay, Ala Wai Yacht<br />

Harbor, Kewalo Bas<strong>in</strong>, Honolulu Harbor, Ke‘ehi Mar<strong>in</strong>a, on pil<strong>in</strong>gs, submerged l<strong>in</strong>es, <strong>and</strong> boat bottoms.<br />

Cooke noted that it is known to st<strong>in</strong>g when h<strong>and</strong>led. Coles et al. (1999a) record its cont<strong>in</strong>ued<br />

presence <strong>in</strong> Pearl Harbor (1976 collections). DeFelice et al. (2001) note that it now occurs on all the<br />

ma<strong>in</strong> Hawaiian Isl<strong>and</strong>s. DeFelice et al. (1998) report it from Midway Atoll, <strong>and</strong> DeFelice et al.<br />

(2002) report it from French Frigate Shoals.<br />

Studies of the feed<strong>in</strong>g biology of Pennaria (as P. tiarella) by Pardy & Lenhoff (1968), <strong>and</strong> on<br />

the paths <strong>and</strong> rates of food distribution by Rees et al. (1970) were based upon specimens from float<strong>in</strong>g<br />

docks at Coconut Isl<strong>and</strong>, Kāne‘ohe Bay.<br />

Hoover (1998, 2006) illustrates specimens from Lāna‘i Lookout, O‘ahu, from approximately 7<br />

m depth. He notes that Pennaria disticha is “the most common large hydroid <strong>in</strong> Hawai‘i” <strong>and</strong> that it<br />

grows to its largest size (about 30 cm height) <strong>in</strong> protected locations such as Kāne‘ohe Bay.<br />

Haleciidae<br />

Halecium beanii (Johnston, 1838)<br />

Cryptogenic<br />

De Oreo (1946) reported this widespread tropical <strong>and</strong> temperate hydroid, whose orig<strong>in</strong> is unknown,<br />

to cause human dermatitis <strong>in</strong> Hawai‘i, based upon a series of cases beg<strong>in</strong>n<strong>in</strong>g <strong>in</strong> June 1943 <strong>in</strong> the<br />

vic<strong>in</strong>ity of Honolulu, with details of further cases <strong>in</strong> 1945. It is tempt<strong>in</strong>g to <strong>in</strong>terpret these first<br />

reports of Halecium-<strong>in</strong>duced dermatitis as the tim<strong>in</strong>g of its <strong>in</strong>troduction dur<strong>in</strong>g World War II, but<br />

confirmation of this will await a more detailed study of the chronological appearance of this hydroid<br />

around the Pacific theater. Cooke (1977a) recorded it from “rubble at a depth of 30 feet <strong>in</strong> Maunalua<br />

Bay”, based upon material collected <strong>in</strong> 1972. He earlier recorded it at Enewetak on pier pil<strong>in</strong>gs <strong>and</strong><br />

on rubble from a patch reef <strong>in</strong> shallow water (Cooke, 1975). The earliest Bishop Museum material<br />

is from 1945 (Coles et al., 1999b) from Honolulu Harbor, on a wood block at 5 m depth (BPBM<br />

D260). It was also found <strong>in</strong> 1998 at Barbers Po<strong>in</strong>t Harbor, O‘ahu (Coles et al., 1999b).<br />

Halecium sibogae Billard, 1929<br />

Cryptogenic<br />

Specimens of this Indo-Pacific species were collected <strong>in</strong> 2003 on the Mahi wreck <strong>in</strong> O‘ahu <strong>in</strong> 20 to<br />

30 m of water by Steve Coles <strong>and</strong> identified as this species by Dale Calder as a new record for<br />

Hawai‘i (S.L.Coles, pers. comm., February 2004).

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