Mysticarion porrectus ( Iredale, 1941 )

Hyman, Isabel T. & Ponder, Winston F., 2010, A morphological phylogenetic analysis and generic revision of Australian Helicarionidae (Gastropoda: Pulmonata: Stylommatophora), and an assessment of the relationships of the family 2462, Zootaxa 2462 (1), pp. 1-148: 36-38

publication ID 10.11646/zootaxa.2462.1.1

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Mysticarion porrectus ( Iredale, 1941 )


Mysticarion porrectus ( Iredale, 1941)  

Figures 5B View FIGURE 5 , 6C View FIGURE 6 , 7F View FIGURE 7 , 8F View FIGURE 8 , 9F View FIGURE 9 , 12C View FIGURE 12 , 13C View FIGURE 13 , 15D–F View FIGURE 15 , 16A View FIGURE 16

Helicarion porrectus ( Iredale, 1941)   1992: 234.

Material examined. New South Wales, Australia: Probable holotype: AM C101136 (one shell measured, photographed), NW of Sydney , Blue Mountains, Mt. Irvine (33º29' S, 150º28' E), pre 1941, M. Ward GoogleMaps   .

Other material: AM C165048 (one specimen dissected), NW of Sydney , Blue Mountains National Park , N of Katoomba, Mount Wilson (33º31' S, 150º22' E), on tree ferns, 9 Feb. 1991, G.A. Clark GoogleMaps   , R. deKeyzer; AM C205296 (one specimen dissected, radula examined), Forest Rd. , at the entrance to the Mountaineer Trail, Barrington Tops National Park Wilderness Area (32º07.56’ S, 151º40.68’ E), mixed beech and Callicoma   forest, in trees, on bark and the underside of leaves, 9 Feb. 2002, M. Shea, I. Hyman, C. Urquhart GoogleMaps   ; QMMO29298 (two specimens dissected, one radula examined), Robertson Nature Reserve , Robertson (34º36' S, 150º36' E), warm temperate rainforest, on leaves of trees, 4 Jan. 1990, J. Stanisic, J. Chaseling GoogleMaps   ; QMMO20281 (one specimen dissected), Point Lookout , New England National Park, rainforest, crawling on trees, 7 Jan. 1989, J. Stanisic, J. Chaseling   ; QMMO37006 (one specimen dissected), Kookaburra Walking Trail, ca. 0.5 km NW of Kookaburra Forestry Camp, Carrai State Forest, NW Kempsey (31º01'25'' S, 152º20'05'' E), warm temperate rainforest, on trees feeding on lichen and moss, 10 Jan. 1992, J. Stanisic, J. Chaseling GoogleMaps   ; QMMO27296 (one specimen dissected), Gibraltar Range National Park , W of Grafton (29º31' S, 152º25' E), on leaves of trees in rainforest, 4 Mar. 1990, D. & N. Potter GoogleMaps   .

Queensland, Australia: QMMO24253 (one specimen dissected), summit Mt. Superbus   , 1300 m, 8 Feb. 1990, G. Monteith, G. Thompson, H. Janetski   .

Description. External morphology: Shell ( Figures 7F View FIGURE 7 , 8F View FIGURE 8 , 9F View FIGURE 9 , 16A View FIGURE 16 ) reduced, 3.3–3.6 whorls, orangebrown, spire flat, apex slightly raised, shape and sculpture as for genus. Animal ( Figure 5B View FIGURE 5 ) cream. Mantle laps wide at base, moderately long, rounded, not fused, uniform in colour. Right and median mantle lobes of medium size, left mantle lobe small. Caudal horn small to medium; caudal foss vertical or diamond-shaped slit in tail.

Mantle cavity: As for genus. Pigmentation of few white spots sometimes present.

Digestive system: As for genus.

Genital system ( Figures 12C View FIGURE 12 , 13C View FIGURE 13 ): As for genus. Free oviduct moderately long; internal longitudinal pilasters absent. Penis moderately short; epiphallus enters penis through short verge (about a quarter of penis length or less); penis internally covered in irregular longitudinal ridges, two longitudinal penis pilasters present. Epiphallus shorter than penis, internally with two longitudinal pilasters.

Radula   ( Figure 15D–F View FIGURE 15 ): As for genus. Central tooth mesocone slightly longer than tooth base. Marginal teeth subdivided into three to five extra teeth towards outer edge. Radular formula ( × 126 rows (QMMO 29298); ( × 130 rows (AM C205296), (~ × 128 rows (AM C165048).

Range and habitat. The range of Mysticarion porrectus   was previously thought to be quite narrow, including only the Blue Mountains region in New South Wales. However, in the current study, specimens from around Barrington Tops, Wauchope, Dorrigo and Casino (just south of the New South Wales-Queensland border) have been included in this species, dissections having shown their anatomy to be identical to the Blue Mountains species. Populations from the Wyong and Olney State Forests in mideastern New South Wales may also belong to M. porrectus   (J. Stanisic, pers. comm.) but were not examined in the current study. There is also a single specimen in the Australian Museum from southwest of Narooma in southern New South Wales. Thus M. porrectus   appears to have a wide but apparently discontinuous range.

Mysticarion porrectus   usually occupies rainforest, but can also be found in vine thickets and open eucalypt forest. The species is arboreal and is most commonly found on tree trunks and the underside of leaves and fern fronds. It is also occasionally found in leaf litter and on mossy rocks.

Another species belonging to this genus, Mysticarion insuetus   , was not examined in the current study but was described from around Scone. It is probably sympatric with Barrington Tops populations of M. porrectus   . However, it is usually found in drier habitats (Stanisic et al., in preparation). Mysticarion insuetus   can be distinguished from M. porrectus   by its smaller size and slightly raised spire. No anatomical information is available for M. insuetus   .

Remarks. Specimens from several widely dispersed and isolated regions were examined, with the expectation that these might have diverged into separate species. Instead, these specimens were found to be identical to M. porrectus   in every detail, including the internal structure of the penis; for this reason all populations examined have been provisionally included in M. porrectus   pending DNA studies.

Populations of Mysticarion porrectus   from the Beaury State Forest in northern New South Wales are sympatric with M. hyalina   . Mysticarion porrectus   can be distinguished from M. hyalina   by its more reduced shell and anatomically by the presence of two penial pilasters ( M. hyalina   has only one) and a shorter penial verge.


Australian Museum


Departamento de Geologia, Universidad de Chile