Accession Number : AD0616481

Title :   THE MORPHOLOGY, LIFE-HISTORY, AND SYSTEMATICS OF THE DIGENETIC TREMATODE, HOMALOMETRON PALLIDUM STAFFORD, 1904,

Corporate Author : AMERICAN MUSEUM OF NATURAL HISTORY NEW YORK

Personal Author(s) : Stunkard,Horace W.

Report Date : 1963

Pagination or Media Count : 12

Abstract : The successive stages in the life-history of Homalometron pallidum, a parasite of Fundulus heteroclitus, described by Linton, 1901 and named by Stafford, 1904, have been discovered and identified. The asexual generations are in Hydrobia minuta and the metacercarial stages are encysted in Gemma gemma, H. minuta, and small polychaete annelids which serve as secondary intermediate and transfer hosts. Knowledge of larval as well as adult stages gives a better basis for determination of the evolution and systematics of the allocreadiid-leprocreadiid trematodes. The subfamily Homalometroninae contains marine, brackish-, and freshwater species. Manter (1963) discussed the geographical dispersal of the group and the possible significance of present distribution for the phylogeny and evolution of the parasites and of their hosts. In his opinion, the subfamily illustrates an evolution from marine ancestors, through secondary-division hosts, to become parasites of fresh-water fishes. Results of the present investigation support his hypothesis. (Author)

Descriptors :   (*TREMATODES, MORPHOLOGY(BIOLOGY)), (*LIFE CYCLES, TREMATODES), PARASITES, MARINE BIOLOGY, FISHES, LARVAE, ADULTS, IDENTIFICATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE