Fastosarion griseolus Stanisic, 2010

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 : 408-409

Fastosarion griseolus Stanisic, 2010

Figs. 6 , 7F , 8G–H , 14A–C , 15

Fastosarion griseola [sic!] Stanisic, 2010 in Stanisic et al., 2010: 304–305, 327.

Material examined

Types: Holotype: QM MO51554 (Bobby Ra., c. 12.1 km from Granite Ck Crossing on Bobby Ra.-Mt Perry Rd , SEQ, 24°37’S, 151°32’E, nvf, under palm fronds, 16 Sept 1985, J. Stanisic, D. Potter).

Paratypes: QM MO12152 , QM MO13275 , QM MO21873 , QM MO38962 , QM MO43550 , QM MO55560 , QM MO55568 , AM C.425285, AM C.425286.

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (figs. 7F, 14A–C) medium-sized to large (17.0– 23.5 mm), amber, 3.3–3.6 whorls, subglobose with a low, prominent spire. Body (fig. 8G–H) 50–65 mm, colour grey to pink, darker grey on neck, tail with grey or black spots. Shell lappets and mantle lobes large, spotted, lappets joined by a narrow collar. Dark line along mantle collar. Tail keeled towards tip, slime network prominent.

Genital anatomy: Genitalia (fig. 15) with medium length vagina, very swollen; bursa copulatrix moderately long, duct distinct, bursa elongate oval. Penis moderately short, slender, swollen proximally, internally with two complete longitudinal pilasters, internal wall sculptured with fine, sometimes wavy longitudinal ridges; 20–60% of penis contained in penial tunica. Epiphallus enters penis through a large verge; penis shorter than epiphallus; epiphallus 2 slightly longer than epiphallus 1; epiphallic caecum of moderate length; flagellum short, slender, terminal portion fused into spiral. Spermatophore simple (based on fragment only).

Remarks

The spelling of the species name is adapted herein to agree with the masculine gender of the genus name. This large semislug is found from Bundaberg to Miriam Vale and has been introduced into Brisbane (fig. 6; Stanisic et al., 2010). Fastosarion griseolus has a somewhat different genital anatomy to other members of Clade A, being the only species with a large penial verge and with longitudinal ridges in the penial interior. It is the most basal species in Clade A and is genetically also rather distinct. However, it shares with other members of Clade A its large size, subglobose to globose shell of around 3.5 whorls, large, smooth shell lappets, and the ridged penial interior is similar to the diagonal ridges found in most Clade A species.

Figures

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 14 Shell microsculpture. A–C.Fastosarion griseolus, MO55568 (A = protoconch, B = early teleoconch, C = late teleoconch). D. Fastosarion alyssa, F230784 (protoconch). E–F.Fastosarion minerva, MO65418 (E = protoconch, F = teleoconch). G–I.Fastosarion papillosus, MO78896 (G = protoconch, H = early teleoconch, I = late teleoconch).J–L.Stanisicarion aquila, MO49825 (J = protoconch, K = early teleoconch, L = late teleoconch). Scale bars 20 µm (A, D, E, I), 100 µm (B, F, L), 50 µm (C, G-H, J-K).

FIGURE 15 Genitalia of F.griseolus, MO55568, Bobby Range.A.Reproductive system. Arrow shows the junction of the penis and epiphallus.B. Penis interior. Scale bars 1 mm (B), 2 mm (A).