Helicarion mastersi ( Cox, 1868 ), Semislug

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: 24-30

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http://doi.org/ 10.11646/zootaxa.2462.1.1

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Helicarion mastersi ( Cox, 1868 )


Helicarion mastersi ( Cox, 1868)  

Figures 6A–B View FIGURE 6 , 7C–D View FIGURE 7 , 8C–D View FIGURE 8 , 9C–D View FIGURE 9 , 12B View FIGURE 12 , 13B View FIGURE 13 , 14C View FIGURE 14 , 15A–C View FIGURE 15

Vitrina mastersi Cox, 1868: 86   , pl. 14, figs 12, 12a; Pfeiffer, 1876: 24.

Helicarion mastersi: Cox, 1909: 6   ; Iredale, 1941: 6; Pfeiffer & Clessin, 1881: 32; Tryon, 1885: 170, pl. 38, figs 48–49. Vercularion mastersi: Iredale, 1937c: 9   .

Helicarion mastersi callidus Iredale, 1941: 6   ; Smith, 1992: 234.

Helicarion mastersi mastersi: Smith, 1992: 234   .

Synonymy follows Smith (1992).

Material examined. New South Wales, Australia: Holotype: AM C101139 (one shell measured, photographed), Kiama (34º40' S, 150º51' E), pre 1868, G. Masters. GoogleMaps  

Other material: AM C101138 ( callidus   holotype) (one shell measured, photographed), Twofold Bay area (37º4' S, 149º53' E), pre 1941 GoogleMaps   ; AM C334204 (three specimens dissected; one radula examined), ca. 2.6 km NW of Nadgee Beach, Nadgee   R, Nadgee Homestead (37º26' S, 149º56' E), 21 May 1970, H. Recher GoogleMaps   ; AM C162824 (one specimen dissected), ca. 2.6 km NW of Nadgee Beach, Nadgee   R, behind " Arry's Ut " (37º25.86' S, 149º56.2' E), 18 Jan. 1970, H. Recher GoogleMaps   ; AM C115975 (one specimen dissected), Sydney S, Royal National Park, S end Lady Carrington Drive (34º9' S, 151º1.75' E), under palm fronds, 27 May 1979, J. Stanisic GoogleMaps   .

Description. External morphology: Shell ( Figures 7C View FIGURE 7 , 8C View FIGURE 8 , 9C View FIGURE 9 ) reduced, 3 whorls, reddish brown, shape and sculpture as for genus. Animal ( Figure 6A View FIGURE 6 ) with sole white, body grey, darker at end of tail and above head. Right and left mantle laps wide at base, long, tapering to a point, not fused, uniform in colour. Right and left mantle lobes small, middle mantle lobe of medium size. Caudal horn very small.

Mantle cavity and digestive system: As for genus.

Genital system ( Figures 12B View FIGURE 12 , 13B View FIGURE 13 , 14C View FIGURE 14 ): As for genus. Free oviduct with internal longitudinal pilasters present distal to capsular gland. Vagina very short, internally with longitudinal pilasters. Penis moderately long; penial sheath present, enclosing only penis. Epiphallus shorter than penis, simple internally. Spermatophore as for genus.

Radula   ( Figure 17A–C View FIGURE 17 ): As for genus. Marginal tooth ectocones equal in length to mesocone. Radular formula ( × 122 rows.

Range and habitat. Helicarion mastersi   is found in habitats ranging from rainforest to dry sclerophyll woodland in southern to mid New South Wales. It ranges from Nadgee Nature Reserve, south of Eden in southern New South Wales, to Mt. Kelgoola and Mt. Coricudgy, east of Rylstone, New South Wales, and also extends to the Australian Capital Territory in the west. This species is most commonly found under logs, rocks, litter and other debris on the ground but is also occasionally found on trees, on the trunks or the underside of leaves.

Remarks. Specimens from the extreme southern end of the range (Twofold Bay, southern New South Wales) of Helicarion mastersi   were differentiated by Iredale (1941) as the subspecies Helicarion mastersi callidus   on the basis of a more tightly coiled shell and dark grey body colouration in contrast to the whitish colouration seen in mastersi   . A number of specimens from different parts of the range were examined and no differences in body colouration, shell coiling or anatomy were found. For this reason the subspecies have been synonymised.

The range of Helicarion mastersi   does not overlap with any other Helicarion species.   Helicarion nigra (Quoy and Gaimard, 1832)   is found further south in Victoria and H. leopardina Iredale, 1941   occurs further to the north. Two other semislug species from the group with cryptae in the epiphallic flagellum and no caecum, Mysticarion porrectus   and Peloparion iridis   , overlap in range with H. mastersi   , as does the semislug Fastosarion freycineti   . These species can be distinguished from H. mastersi   by their smaller size and different body colouration. Mysticarion porrectus   has a cream body, P. iridis   is grey with dark markings on the foot and around the rounded mantle laps and F. freycineti   is cream with grey markings and has a less flattened shell than H. mastersi   .


Australian Museum


Departamento de Geologia, Universidad de Chile














Helicarion mastersi ( Cox, 1868 )

Hyman, Isabel T. & Ponder, Winston F. 2010

Helicarion mastersi mastersi:

Smith, B. J. 1992: 234

Helicarion mastersi callidus

Smith, B. J. 1992: 234
Iredale, T. 1941: 6

Helicarion mastersi:

Iredale, T. 1941: 6
Iredale, T. 1937: 9
Cox, J. C. 1909: 6
Tryon, G. W. 1885: 170
Pfeiffer, L. & Clessin, S. 1881: 32

Vitrina mastersi

Pfeiffer, L. 1876: 24
Cox, J. C. 1868: 86