Title

Development of Two Tetrarhynchidean Cestodes from the Northern Gulf of Mexico

Date of Award

1986

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Department

Coastal Sciences, Gulf Coast Research Laboratory

First Advisor

Robin M. Overstreet

Advisor Department

Coastal Sciences, Gulf Coast Research Laboratory

Abstract

The life-cycles of Prochristianella hispida and Poecilancistrium caryophyllum were determined from natural and experimental infections. The three-host life-cycle of Prochristianella hispida involved the development of an oncosphere in a non-operculated egg, a thecate primary metacestode in the hemocoel of a copepod, a terminal metacestode in the hepatopancreas of penaeid or callianassid shrimps, and an adult in the spiral valve of daysatid stingrays. The four-host life-cycle of Poecilancistrium caryophyllum involved the development of a coracidium within an operculated egg, a primary metacestode in the hemocoel of a copepod, apparently a secondary metacestode in the viscera of a copepod-eating teleost, a terminal metacestode in the flesh of sciaenid fishes, and an adult in the upper intestine of certain carcharhinid sharks. A three-host life-cycle probably represents the typical pattern for those tetrarhynchideans that have a non-operculated egg and their terminal metacestode in a crustacean. A four-host life-cycle probably represents the typical pattern for those tetrarhynchideans that have an operculated egg, a coracidium as the larval stage, and a terminal metacestode in a teleost. The proposed three-host and four-host life-cycle patterns contrast with the two-host pattern proposed by Mudry and Dailey (1971) and with the widely accepted three-host pattern proposed by Young (1954), Riser (1956), and Mudry and Dailey (1971).