Australian Biological Resources Study

Australian Faunal Directory

<i>Sebekia johnstoni </i>Riley, Spratt & Winch, 1990

Sebekia johnstoni Riley, Spratt & Winch, 1990


Regional Maps

Family Sebekidae Sambon, 1922



Adults are parasites of crocodiles, alligators and turtles, the intermediate hosts being fishes and perhaps lizards and snakes. Junker & Boomker (2006) diagnosed the genera and listed all the species and their hosts.



Body in adults short and massive (banana-shaped); cylindrical, often somewhat dilated posteriorly. Annuli in adults not thickened. Rostrum in adults absent. Mouth in adults behind anterior hooks. Podial lobes in adults absent. Proximal podomere of appendages 3 and 4 modified as fulcrum, campanulate in larvae and boat-shaped in adults; fulcrum in adults at least double length of hooks. Primary hooks in adults reduced, trapezoidal; accessory hooks present and dorsal from larvae to nymph, absent in adults; hooks with rows of large or reduced spines present. Cirrus sac in adults present, long. Terminal papillae in adults absent. Ejaculatory bulbs in adults elongate. Testes single. Nervous system in adults all ganglia fused into single suboesophagic nerve mass. Uterus in adults tubular. Female gonopore in adults subterminal, posterior, adjacent or fused to anus (opisthogyne condition). Thorax in larvae short, not segmented. Medium spine of penetrating apparatus in primary larvae simple. Lateral spines of penetrating apparatus in primary larvae bifid. Spines of annuli in nymph present. Spiny eggshells in adults absent. (derived from Almeida & Christoffersen 1999)

Body elongate or squat. Abdominal rings short, tight and numerous (>70). Lateral line usually visible. Hooks simple in adults, arranged in a trapezoid; hooks in adults double. Fulcrum variable, generally U-shaped, sometimes more or less oval or square. Female with vulva immediately anterior to anus (opisthogyne type). (translated from Fain 1961)


History of changes

Note that this list may be incomplete for dates prior to September 2013.
Published As part of group Action Date Action Type Compiler(s)
21-Mar-2012 21-Mar-2012 MODIFIED
28-Feb-2012 28-Feb-2012 MODIFIED
20-Oct-2011 20-Oct-2011 MODIFIED
12-Apr-2011 12-Apr-2011 MOVED
31-Mar-2011 ADDED