Glossobius anctus Bruce & Bowman, 1989

Martin, Melissa B., Bruce, Niel L. & Nowak, Barbara F., 2015, Review of the buccal-attaching fish parasite genus Glossobius Schioedte & Meinert, 1883 (Crustacea: Isopoda: Cymothoidae), Zootaxa 3973 (2), pp. 337-350 : 344

Glossobius anctus Bruce & Bowman, 1989

Glossobius anctus Bruce & Bowman, 1989: 13 , figs. 9–10.—Bruce, Lew Ton & Poore, 2002: 177.

Type and type locality. 18°25’S, 118°52’E, North West Shelf, Western Australia; deposited at the Australian Museum, Sydney (holotype AM P35743; paratype AM P35744) and the National Museum of Natural History, Washington (paratypes USNM 227110, 227112 and 227113) ( Bruce & Bowman 1989).

Remarks. Glossobius anctus is readily identified by the subparallel body shape; cephalon not immersed in pereonite 1; anterolateral pereonite 1 margin smooth; anteroventral coxae margins broad; fleshy and produced labrum; pleotelson subtruncate and antennule article 1 straight.

Glossobius anctus and G. impressus have a near identical morphology of pereopod 1 with merus proximal margin with slight bulbous protrusion; pereopod 7 basis with raised carina; cephalon not immersed in pereonite 1; and all pleopods are laminar. The host distribution of both species of Glossobius overlap. Glossobius parexocoetii is reported only from Parexocoetus brachypterus (Richardson, 1846) where the host is widespread in the Indo- Pacific region and has a separate population in the eastern tropical Pacific Ocean, whereas the host distribution of G. anctus ( Euleptorhampus viridis (van Hasselt, 1823)) includes the tropical and temperate regions of the Pacific, Atlantic and Indian Oceans ( Froese & Pauly 2015). Glossobius anctus differs from G. impressus by lacking the bulbous lobe on the anterolateral margins of pereonites 1 and 2; and the broader anterior margins of all coxae. Glossobius parexocoetii is also similar to G. anctus in the subparallel pereon; pleonite 1–5 of subequal length and width; and pleotelson lateral margin straight; but differs from the latter in having the rostrum more acute; anterolateral margins of pereonites 1–3 acute; the presence of a medial point on the posterior margins of pereonites 4–5 and the less broad anterior margins of the coxae.

Distribution. Known from the tropical and subtropical Indian and Pacific Oceans with records from Hawaii, Japan, and eastern and western Australia. ( Bruce & Bowman 1989).

Hosts. The ribbon halfbeak Euleptorhampus viridis (van Hasselt, 1823).