Fastosarion hannianus ( 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 : 419-423

Fastosarion hannianus ( Stanisic, 2010)

Figs. 18 , 19D , 20F , 22E–F , 24

Hymanarion hanniana [sic!] Stanisic, 2010 in Stanisic et al., 2010: 318–319, 334.

Material examined

Types: Holotype: QMMO48176 ( Bakers Blue Mtn , c. 17 km W of Mt Molloy, NEQ 16°42’S, 145°10’E, rainforest, 800–1000 m, under logs, coll. 30 Dec 1989, ANZSES).

Paratypes: QM MO48167 , QM MO78907 .

Non-type material: See table 1 .

Diagnosis

External morphology: Shell (fig. 19D) small (9.6 mm), golden amber, transparent, 2.1–3.0 whorls, subglobose, thin, last whorl large. Body (fig. 20F) 18–24 mm, dark reddish brown, darker on tail; dark bands on either side of neck. Mantle lobes and shell lappets moderately large, darker in colour, smooth. Tail not keeled, slime network weak. White pigmentation on visceral mass visible through shell.

Genital anatomy: Genitalia (figs. 22E–F, 24) with very short vagina; bursa copulatrix very short, duct distinct, bursa spherical. Penis large, cylindrical, internally often with 3–4 short, narrow longitudinal pilasters basally, two narrow longitudinal pilasters proximally, and one stimulator and one rounded pilaster medially; internal wall pustulose distally and longitudinally ridged proximally; 50% of penis contained in penial tunica. Epiphallus approx. equal to penis length; epiphallus arms equal in length; epiphallic caecum short; flagellum moderately long, uncoiled, slender, slightly swollen towards tip. Spermatophore simple (based on a fragment).

Remarks

The spelling of the species name is adapted herein to agree with the masculine gender of the genus name. Fastosarion hannianus is only known from the Hann Tableland and Bakers Blue Mountain, SW of Mossman in northeastern Qld (fig. 18), where it is found in vine thicket on basalt. This species shares with F. alyssa , F. insularis and F. mcdonaldi its small size and low-spired shell no greater than three whorls with, a short vagina and bursa copulatrix, equal length arms of the epiphallus, and a penis with some rounded pilasters proximally. It differs from these species in its more globose shell. Fastosarion hannianus is genetically very distinct from its nearest relatives ( F. alyssa and F. insularis ).

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 20 Fastosarion live images (Clade B). A-D.Fastosarion alyssa, A:AM C.512537, Mt Etna Caves; B:AM C.512480, Mt Ossa; C:AM C.512579, The Hummock. D: NMV F230748,Brandy Creek (Type locality of F.peterbrocki; A.Moussalli, NMV). E. Fastosarion ephelis (J. Stanisic).F.Fastosarion hannianus (QM image).G. Fastosarion mcdonaldi, Mt Dalrymple (QM image). H. Fastosarion rowani, AM C.512541,Dan Dan NP.

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 24 Genitalia of F.hannianus. A, B. MO72277,Bakers Blue Mountain. C.MO76564, Hann Tableland.A. Reproductive system. Arrow shows the junction of the penis and epiphallus. B–C. Penis interior.Scale bars 1 mm.