The life cycle of Sclerocollum saudii Al-Jahdali, 2010 (Acanthocephala: Palaeacanthocephala: Rhadinorhynchidae) in amphipod and fish hosts from the Red Sea M.O. Al-Jahdali*, R.M. El-Said Hassanine and H. El-S. Touliabah Biological Sciences Department, Rabigh-Faculty of Science and Arts, King Abdulaziz University, PO Box 344, Rabigh 21911, Saudi Arabia (Received 8 October 2013; Accepted 27 January 2014) Abstract The rhadinorhynchid Sclerocollum saudii Al-Jahdali, 2010 was found in the intestine of its type host, Siganus rivulatus Forsska ˚l & Niebuhr, 1775, a siganid fish permanently resident in a lagoon within the mangrove swamps found on the Egyptian coast of the Gulf of Aqaba (between 2887 0 N and 28818 0 N). Larval forms of this acanthocephalan (acanthors, acanthellae and cystacanths) were only found in Megaluropus agilis Hoek, 1889 (Crustacea: Gammaridae), a benthic amphipod abundant on algae and seagrasses in the lagoon. So, this life cycle of S. saudii was elucidated under semi-natural conditions: embryonated eggs of S. saudii were directly ingested by the amphipod and hatched in its intestine; the released acanthor penetrated the intestinal epithelium in 12 – 18 h to reach the connective tissue serosa, where it remained for about 3 days, then penetrated the intestinal wall and remained attached to its outer surface for 4 days. It then detached and dropped free in the amphipod haemocoel and transformed into an oval acanthella, growing for 16 days to reach the cystacanth stage. The cystacanth at 46 days post-infection was infective to fish (excysted in its intestine as an active juvenile). Male and female juveniles reached maturity 17 and 23 days post-infection. Recently copulated females first appeared 26 days post-infection and all females seemed to be copulated at 28 days post-infection; partially and fully gravid females first appeared 31 and 35 days post-infection. Mature males and fully gravid females started to die off naturally 31 and 43 days post-infection and were totally expelled from the fish intestine by 42 and 52 days post-infection. The cycle was completed in 89 days and is similar to other known palaeacanthocephalan life cycles, but has its own characteristics. Introduction Acanthocephala is a parasitic phylum including a group of intestinal worms parasitizing all classes of vertebrates as definitive hosts. Currently, it includes four classes (Archiacanthocephala Meyer, 1931; Palaeacantho- cephala Meyer, 1931; Eoacanthocephala Van Cleave, 1936; Polyacanthocephala Amin, 1987), 26 families, 157 genera and about 1298 species (see Amin, 2013). Palaeacantho- cephala is the largest class and includes most fish acanthocephalans. To date, little is known about the details of most acanthocephalan life cycles, since complete life cycles are known for only about 25 species of acanthocephalans from those parasitizing fish, amphibians, reptiles and birds (Ribas & Casanova, 2006). Most of these cycles have been completed experimentally. In these cycles, adult acanthocephalans lay their embryonated eggs in the intestine of their vertebrate definitive hosts, eggs pass in *E-mail: Maljahdalii@yahoo.com Journal of Helminthology , page 1 of 11 doi:10.1017/S0022149X14000042 q Cambridge University Press 2014