Fastosarion pustulosus 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 : 434-435

Fastosarion pustulosus Stanisic, 2010

Figs. 18 , 19L , 30C–D

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

Material examined

Types: Holotype: QM MO4295 (c. 4km below summit Mt Fort William , Kalpowar SF, SEQ, 24°41’S, 151°21’E, mvf/ Araucaria , under logs and rocks, 3.vii.1984, J. Stanisic, D. Potter, K. Emberton).

Paratypes: QM MO43276 , QM MO78894 .

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (fig. 19L) medium-sized (12.1 mm), dull amber, very transparent, 4.1 whorls, subglobose with a moderately low spire. Body (in ethanol) beige, sole paler. Mantle lobes and shell lappets moderately small, narrow, each lappet with a row of at least five unpigmented warts and with black streaks or markings. Tail weakly keeled at tip, slime network moderately strong, caudal horn large.

Genital anatomy: Genitalia (fig. 30C–D) with long vagina, with longitudinal pilasters; bursa copulatrix very short, duct distinct, bursa oval. Penis long, narrow, cylindrical, proximally fused to epiphallus 2, internally with pulstulose transverse ridges and one transversely ridged longitudinal pilaster, several smooth, minor pilasters basally; 35% of penis contained in penial tunica. Epiphallus longer than penis; entering penis through a simple pore; epiphallus 2 longer than epiphallus 1; at least half of epiphallus 2 fused to penis; epiphallic caecum of moderate length, penial retractor muscle attaching to middle; flagellum of moderate length, slender.

Remarks

The spelling of the species name is adapted herein to agree with the masculine gender of the genus name. Fastosarion pustulosus is recorded from Monto to Rockhampton in southeastern Qld ( Stanisic et al., 2010); however, we demonstrate that specimens from around Rockhampton belong to congeners Fastosarion katatonos and Fastosariondeensis. This restricts F. pustulosus to specimens from the type locality, Mt Fort William in Kalpowar State Forest (fig. 18). The three populations were previously grouped together based on the strong similarity between their shells, although F. pustulosus appears to be slightly smaller and higher spired. They are also very similar in their external morphology, with similar body colouration (only observed in ethanol) and pustulose shell lappets. However, they differ greatly in their genital anatomy and are also genetically distinct. Fastosarion pustulosus is most closely related to F. papillosus and shares with it the fused penis and epiphallus and a similar internal penial anatomy.

Figures

FIGURE 18 Distribution of Clade B species. █ = F.alyssa, ▼ = F.deensis, × = F.ephelis, ♢ = F.hannianus, ▲ = F. insularis, ◻ = F.katatonos, ∆ = F.longimentula, ● = F.mcdonaldi, ♠ = F.minerva, ◆ = F.papillosus, ♣ = F.pustulosus, ♥ = F.rowani, Ǫ = F.sarina, ▽ = F.tuljun.

FIGURE 19 Shells of Clade B species. A. Fastosarion alyssa (type locality of D.peterbrocki), NMV F230748. B. Fastosarion deensis, MO85834 (holotype). C. Fastosarion ephelis, MO85835 (holotype). D. Fastosarion hannianus, MO56684.E. Fastosarion insularis sp. nov., MO76354. F. Fastosarion katatonos, MO85837 (holotype). G.Fastosarion longimentula, MO65313.H. Fastosarion mcdonaldi, MO50434.I. Fastosarion minerva, MO78358. J.Fastosarion papillosus, MO78896 (Mt Superbus).K.Fastosarion papillosus, MO62397 (Kroombit Tops). L.Fastosarion pustulosus, MO78894 (Kalpowar SF).M. Fastosarion rowani, MO85839 (holotype). N. Fastosarion sarina, MO85840 (holotype).O. Fastosarion tujun (Denham Range), MO76081 (holotype). Scale bar 5 mm.

FIGURE 30 Genitalia.A-B.F.papillosus, MO78896, Mt Superbus.C-D.F.pustulosus, MO78894, Mt Fort William. A, D.Reproductive system. Arrows show the junction of the penis and epiphallus. B–C. Penis interior. Scale bars 2 mm.