An exceptionally rich complex of Sanguinicolidae von Graff, 1907 (Platyhelminthes: Trematoda) from Siganidae, Labridae and Mullidae (Teleostei: Perciformes) from the Indo-west Pacific Region Nolan, Matthew J. Cribb, Thomas H. Zootaxa 2006 2006-05-26 1218 1 1 80 4GXDZ Nolan & Cribb, 2006 Nolan & Cribb 2006 [264,546,1084,1110] Trematoda Aporocotylidae Phthinomita Animalia Diplostomida 34 35 Platyhelminthes species symplocos sp. nov.   Typehost:  Siganus lineatus(Valenciennes), Goldlined Rabbitfish ( Perciformes: Siganidae). Site in host: Intertrabecular spaces of ventricle (heart).   Typelocality: Lizard Island, northern Great Barrier Reef( 14°40’S 145°27’E), Queensland.  Material examined: ex  S. lineatus, LizardIsland (QLD),  May 2004, twenty­seven specimens ( Holotypeno. QM G 225528; Paratypenos. QM G 225529–225537) (another three specimensused for scanning electron microscopy and nineteen specimens sequenced for ITS2). Collector: M.J. Nolan.  Etymology Specific name “ Symplokos” (Gr. interwoven, involved), for the host­parasite system described here.   FIGURES 15–17.  Phthinomita symplocos n. g., n. sp.from the intertrabecular spaces of the ventricle (heart) of  Siganus lineatusoff Lizard Island. 15. Adult. Lateral view, whole mount. 16. Male terminal genitalia, lateral view. 17. Female terminal genitalia, lateral view. Scale­bars:15, 250 m; 16,17, 100 m.   FIGURES 18–22.  Phthinomita symplocos n. g., n. sp.18. Whole mount, lateral view. 19,20. Vestigial oral sucker bearing 5 concentric rows of fine spines. 21. Tegumental spines in incomplete transverse rows; spines covered in tegument or mucus. Run entire length of the body. 22. Disturbed tegumental layer showing uncovered tegumental spines. Scale­bars:18, 100 m; 19–21, 1 m; 22, 10 m.  Description Based on 27 whole mounts. With features of genus. Body slightly notched at male genital pore. Vestigial oral sucker bearing 5 concentric rows of fine spines. Intestine; posterior caeca irregular, distal portions expanded. Anterior testis originating posterior to intercaecal field, margins lobed, containing dorso­ventral muscle fibres. Posterior testis elliptical, margins lobed, rudimentary (may have sperm anteriorly, testis tissue posteriorly (see Figure 8a)). Vas deferens seen antero­dextral to posterior margin of anterior testis; duct from posterior testis passing antero­medially. Cirrus­sac tear­shaped. Internal seminal vesicle ovoid, occupying posterior of cirrus­sac; ejaculatory duct sinuous; prostatic cells not seen. Ovary spherical to ovoid, slightly overlapping posterior margin of anterior testis. Oviduct originating at posterior dorsal margin of ovary, dorsal to vas deferens, entering oötype postero­dorsally. Vitelline duct forming anterior to cirrus­sac, posteriorly dextral to vas deferens and cirrus­sac. Oötype ovoid. Mehlis’ gland extending anteriorly to posterior margin of cirrus­sac, extending posteriorly to anterior margin of posterior testis. Uterus extending from oötype sinuously, sinistral to oviduct. Uterine chamber forming posterior to posterior margin of ovary, sinuous, curving dorsally posteriorly to female pore. Vitelline follicles extending anteriorly past intestinal bifurcation, sinistral and dextral to oesophagus, posterior caeca and anterior testis, posteriorly extending to mid­section of uterine chamber.  Remarks There are 7–35 base differences (1.9–10.7% sequence divergence) between the ITS2 rDNA sequence of  P. symplocos  n. sp.and the remaining  Phthinomitaspeciessequenced here. Between the sequences from  P. symplocosfrom  S. lineatusoff Lizard Island (15 replicates) and  P. munozae  n. sp.from  C. venustusoff Heron Island (four replicates) there are seven bases different. -14.666667 northern Great Barrier Reef 1287 145.45 Lizard Island 34 35 1 Queensland holotype 2004-05 QM 34 35 G 225528, G 225529-225537 1 holotype