Fastosarion aquavitae Scott, 1995

Hyman, Isabel T. & Köhler, Frank, 2019, Phylogeny and systematic revision of the helicarionid semislugs of eastern Queensland (Stylommatophora, Helicarionidae), Contributions to Zoology 88 (4), pp. 351-451 : 399-403

Fastosarion aquavitae Scott, 1995

Figs. 6 , 7B–C , 8B , 10

Fastosarion aquavitae Scott, 1995: 77 , figs. 1d, 2 , 5c, 6; Stanisic et al., 2010: 306–307, 328.

Fastosarion ameyi Stanisic, 2010 in Stanisic et al., 2010: 306–307, 328.

Helicarionidae MQ 10: Stansic, 2018: fig. 4D.

Material examined

Types: Holotype: QM MO55782 ( Conway Range , Brandy Creek Road, 20°20'30"S, 148°39'30"E).

Paratype: QM MO35370 (same data as holotype) .

Holotype of F. ameyi: QM MO 20228 (1 km S of Bell’s Gap on banks of Funnel Ck, via Sarina, MEQ , 21°30’S, 148°08’E, 17 June 1987, J. Stanisic, D. Potter).

Paratypes of F. ameyi: QM MO 78892 (same data as holotype).

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (fig. 7B–C) medium-sized to large (14.0– 18.7 mm), orange amber, 3.2–3.7 whorls, depressedly subglobose with a low spire. Body (fig. 8B) 35–40 mm long, pinkish grey-brown, pink deepening on tail tip, sole reddish. Shell lappets and mantle lobes large, brown, mottled with black; edge of mantle collar lined with black. Tail strongly keeled, slime network moderately strong.

Genital anatomy: Genitalia (fig.10) with medium length vagina, slender; bursa copulatrix moderately short, duct distinct, bursa oval. Penis very long, slender, internally with one partial longitudinal pilaster proximally, internal wall sculptured with pustules; 30% of penis contained in penial tunica. Penis longer than epiphallus, slightly narrower in diameter; epiphallic caecum medium length; flagellum medium length, slender, terminal portion fused into a loop.

Remarks

Fastosarion aquavitae has previously been recorded only from the Conway Range ( Stanisic et al., 2010). However, we treat F. ameyi as a junior synonym based on examination of the type material, and also allocate to this species the candidate taxa Helicarionidae MQ 10 and MQ13 (originally identified through curatorial work), expanding the known range to include Eungella NP, Cathu SF, Mt Blackwood and Sarina (fig. 6). Differences previously noted between F. ameyi and F. aquavitae include shell and body colour and also the more subglobose, less flattened shell shape of F. ameyi . The only spirit-preserved specimens of Fastosarion ameyi from Sarina were the paratypes; the specimens were 30 years old with fragile shells and faded body colouration, making comparisons of shell shape and shell / body colour problematic, but anatomically and genetically were a close match for F. aquavitae . All other material from Sarina was found to belong to either Fastosarion alyssa or Fastosarion sarina .

This species can be distinguished from its congeners by its relatively large size, pinkish body colouration and relatively more flattened shell.

Figures

FIGURE 2 Majority-rule consensus tree based on Bayesian analysis of the concatenated data set of fragments of the mitochondrial genes 16S and COI. Ambiguous alignment sites in 16S removed using MAFFT. Numbers on branches indicate posterior probabilities. Scale bar indicating 40% of modelled sequence divergence. Shells shown to scale.

FIGURE 6 Distribution of Clade A species. ▲ = F.superbus, ◻ = F.aquavitae, ♢ = F.brazieri, ◆ = F.comerfordae, ●= F.griseolus, ▽ = F.helenkingae, █ = F.paluma.

FIGURE 7 Shells of Clade A species. A. Fastosarion superbus, MO77446.B. Fastosarion aquavitae, MO50851.C. Fastosarion aquavitae, MO20228 (type locality of F.ameyi). D. Fastosarion brazieri, AM C.553533.E. Fastosarion comerfordae, MO63985.F.Fastosarion griseolus, MO55568.G.Fastosarion helenkingae, NMV F219324.H. Fastosarion helenkingae, AM C.559842 (type locality of F.schelli). I. Fastosarion paluma, MO63983.J.Fastosarion paluma, MO48024 (Hinchinbrook Is).Scale bar 5 mm.

FIGURE 8 Fastosarion live images (Clade A).A.Fastosarion superbus, MO46340, Mt Dryander (QM image). B.F.aquavitae, NMV F230751, Brandy Creek (A. Moussalli, NMV).C. F.brazieri, AM C.553531, Cape Tribulation (A.Moussalli, NMV).D. F.brazieri, AM C.525003, Mt Lewis.E.F.comerfordae, Broken River NP (Kackland). F.F.paluma, Paluma (QM image). G. F.griseolus, AM C.512514,Byfield SF.H. F.griseolus, AM C.512615,Burleigh Head NP. I. F.helenkingae, NMV F219324,Bowling Green NP (A. Moussalli, NMV).J. F.helenkingae, AM C.559842, Magnetic Island (type locality of F.schelli).

FIGURE 10 Genitalia of F.aquavitae. A, C.MO50851, Conway Range.B, D.MO20228, West Funnel Ck (type locality of F.ameyi). A–B, Reproductive system.Arrow shows the junction of the penis and epiphallus.C–D, Penis interior. Scale bars 2 mm.