Fastosarion minerva ( 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 : 430-432

Fastosarion minerva ( Stanisic, 2010)

Figs. 18 , 15E–F , 19I , 22I–J , 29

Dimidarion minerva Stanisic, 2010 in Stanisic et al., 2010: 316–317.

Material examined

Types: Holotype: QM MO56626 (Springsure, NW at Mt Zamia , Minerva Hills NP, MEQ , 24°05’55” S, 148°00’55” E, sevt, under rocks and logs, coll. 20 Sep 1995, J. Stanisic, D. Potter, C. Eddie).

Paratypes: QM MO76088 , QM MO76366 , QM MO78901 .

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (figs. 15E–F, 19I) small to medium-sized (8.6–12.8 mm), light golden amber, subglobose with a low spire, 3.2–3.5 whorls. Body 24–27 mm long, colour (in ethanol) beige, darker brown on tail, mantle lobes large with black spots and mottling, shell lappets moderately large to large, finely pustulose with multiple rows of larger black warts, joined by a narrow collar; dark line along mantle edge. Tail not keeled, slime network weak, caudal horn large.

Genital anatomy: Genitalia (figs. 22I–J, 29) with short vagina; bursa copulatrix moderately short; duct very short, bursa large, oval shaped. Penis moderate size, cylindrical, inner penial wall sculptured with very fine diagonal ridges, penis interior with one large, raised longitudinal pilaster and three small, irregularly shaped pilasters (two distal, one proximal); 75% of penis contained in penial tunica. Epiphallus slightly longer than penis, entering penis through a simple pore; epiphallus 2 longer than epiphallus 1; epiphallic caecum short; flagellum moderately long, slender, coiled. Spermatophore with a single, finely toothed, spiraling ridge.

Remarks

Fastosarion minerva (from Minerva Hills NP ) was originally described as part of the genus Dimidarion , a group of small semislugs distributed in southern Qld, in habitats ranging from dry vine thicket to rainforest. Herein we show that F. minerva is not closely related to its former congeners (now synonymized to a single species, F. alyssa ) but instead groups most closely with F. deensis and F. rowani , both of which are found near Rockhampton. A similar link between these distant locations is seen in helicarionid species Tarocystis toomba , which is distributed from Rockhampton to the Conway Range and west to Carnarvon Gorge ( Stanisic et al., 2010), and camaenid genus Trachygenia Stanisic, 2010 , which contains species ranging from from Dan Dan Scrub and Kroombit Tops (south of Rockhampton) to the Clarke Range and Conway Range, as well as one species from Carnarvon Gorge.

The type locality of F. minerva is Mt Zamia in Minerva Hills NP (see fig. 18). Populations from Carnarvon NP and Injune are genetically distinct from each other and from those from Mt Zamia. Material suitable for dissection was not available for the type locality, but specimens from Carnarvon NP and Injune did not differ anatomically despite their genetic differentiation.We include all populations within F.minerva , pending further investigation once more material is available.

Figures

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).

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 29 Genitalia of F.minerva, MO78358, Carnarvon NP.A.Reproductive system.Arrow shows the junction of the penis and epiphallus.B. Penis interior. C.Spermatophore. Scale bars 1 mm.