Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae) Author Hyman, Isabel T. Author Köhler, Frank text Contributions to Zoology 2019 2019-10-03 88 4 351 451 http://dx.doi.org/10.1163/18759866-20191416 journal article 10.1163/18759866-20191416 1875-9866 8343061 Fastosarion insularis sp. nov. Figs. 18 , 19E , 25 Etymology From insularis (Latin = of an island), referring to the island habitat of this species; adjective. Material examined Types : Holotype : QM MO85836 ( Palm Island , site 4, NEQ, coll. 22 Feb 2001 , G. Monteith ) . Paratype : QM MO76362 (same data as holotype) . Non-type material : See table 1 . Diagnosis External morphology : Shell (fig. 19E) small ( 9.1–9.4 mm ), pale amber, transparent, 2.8–3.2 whorls, flattened, thin, last whorl large. Body 16–19 mm , colour (in alcohol) brown with tiny white specks; dark bands on either side of neck; sole pale. Mantle lobes and shell lappets moderately large, covered with small white pustules, both lappets with horizontal ridge near lower edge, left lappet only with dark band below ridge. Genital anatomy: Genitalia (fig. 25) with long vagina; bursa copulatrix moderately short, duct distinct, bursa triangular. Penis very large, swollen proximally, internally with 3 longitudinal pilasters; internal wall smooth; 85–90% of penis contained in penial tunica. Epiphallus approx. 1.5–2 times length of penis; epiphallus 1 shorter than epiphallus 2; epiphallic caecum medium length; flagellum short, slender. Remarks Fastosarion insularis (referred to above as ‘ Helicarionidae sp. Palm Island’) is only recorded from Palm Island in northeastern Qld (fig. 18) and is parapatric with respect to its congeners. It is most closely related to F. alyssa , which it greatly resembles, but can be distinguished by the presence of small white pustules covering the shell lappets and lobes, less distinct slime grooves, and a less transparent shell, as well as its distinct genital anatomy.