Fastosarion deensis, Hyman & Köhler, 2019

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 : 416-419

Fastosarion deensis sp. nov.

Figs. 18 , 19B , 22C–D , 23A–C

Etymology

For Dee Range, the type locality; noun in apposition.

Material examined

Types: Holotype: QM MO85834 ( Dee Ra , c. 5.2 km E Mt Morgan, Northern Spur, 23° 38' S, 150° 27' E, coll. 25 Jun 1989, J. Stanisic, D. Potter, J. Chaseling).

Paratypes: QM MO 21578 (same data as holotype) .

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (fig. 19B) medium-sized (11.7–12.8 mm), golden amber, very transparent, 4.0 whorls, subglobose with a low spire. Body 24–25 mm long, colour (in ethanol) beige, darker grey on tail and head. Mantle lobes large, finely pustulose, shell lappets moderately large, finely pustulose, each with several rows of larger unpigmented warts; some smaller pustules have brown pigmentation. Tail not keeled, slime wrinkles weak.

Genital anatomy: Genitalia (figs. 22C–D, 23A–C) with moderately short vagina; bursa copulatrix moderate length; duct broad, long, bursa small, oval shaped. Penis moderate size, cylindrical, inner penial wall sculptured with coarse pustules arranged in irregular transverse rows, penis interior with one proximal penial stimulator; 55% of penis contained in penial tunica. Epiphallus approx. same length as penis, entering through simple pore; epiphallus 2 longer than epiphallus 1; epiphallic caecum short, hooked; flagellum moderately long, slender, coiled. Spermatophore with a single, finely toothed, spiraling ridge only on terminal half of tail-pipe.

Remarks

Fastosation deensis (referred to above as ‘ Helicarionidae sp. Mt Morgan’) is known from a single population 5 km east of Mt Morgan (south of Rockhampton), living under logs in semi-evergreen vine thicket (fig. 18). This population was previously included in F. pustulosus by Stanisic et al. (2010) but is both genetically and anatomically distinct from this species, having a flatter shell and pustulose shell lappets with more numerous rows of warts as well as a distinct genital anatomy. Several other congeners live in close proximity, including Fastosarion katatonos and F. rowani , but none are recorded in sympatry. Fastosarion deensis can be distinguished from the sympatric S. freycineti by its smaller size and the warts on its shell lappets.

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 22 Spermatophores of Clade B species. A-B. F.alyssa, MO77158.C-D.F.deensis, MO85834.E-F. F.hannianus, MO72277.G-H.F.mcdonaldi, MO50434.I-J. F.minerva, MO78358.

FIGURE 23 Genitalia.A–C.F.deensis, MO85834, Mt Morgan. D-E.F.ephelis, MO85835, Broken River.A, D. Reproductive system.Arrows show the junction of the penis and epiphallus.B, E.Penis interior.F.Spermatophore.Scale bars 1 mm (E), 2 mm (A–D).