Haminoea

obsoleta snails, were the causative agent, preliminary investigations suggested that the intermediate host involved was another exotic species, Haminoea japonica, from Asia.

Neither of 2 native Haminoea species found in western North America between Baja, California and Alaska (H.

Despite the fact that all Haminoea species use encapsulated structures at some point during their development, life-history strategies vary considerably among species (Gibson and Chia, 1989a, 1991).

In this study we characterize the development of a population of Haminoea zelandiae at the lower end of the North Island of New Zealand (at Pauatahanui Inlet) as poecilogonous, and examine whether the poecilogonous development exhibited by the species is affected by temperature.

Here we used both field and laboratory experiments to examine the effects of naturally variable UVR, and its interaction with conditions at low tide, on the embryonic mortality of two congeneric species of marine bubble-shell snails (Order: Cephalaspidea): Haminoea zelandiae Gray 1843 in New Zealand (NZ), and Haminoea vesicula Gould 1855 in Washington, USA (WA).

Both Haminoea species are common in sheltered intertidal bays and harbors, and often abundant on sand or mudflats.

and Alderia willowi,) and the cephalaspidean Haminoea japonica Species Intracapsular |[left Post-hatching [right arrow] Early delayed arrow] spontaneous spontaneous Substrate- induced E.

A different mechanism to vary offspring dispersal is employed by the cephalaspidean Haminoea japonica, an invasive population of which was described as H.

Egg masses of three species of opisthobranch (Melanochlamys diomedea Bergh, Haminoea vesicula Gould, H.

Masses of Melanochlamys diomeda and Haminoea callidegenita used in experiments had obvious populations of diatoms (primarily Cylindrotheca sp.