Periclocystis ardeni Iredale, 1937

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 : 77

Periclocystis ardeni Iredale, 1937

Figures 22H , 24E , 26E , 27E , 28E

Periclocystis ardeni Iredale, 1937a: 28 , pl. ii, fig. 13; Iredale, 1937b: 6; Smith, 1992: 240.

Material examined. South Australia, Australia: Holotype: AM C60541 (shell measured, photographed), North Flinders Ranges , Blinman (31º7' S, 138º41' E), pre 1937.

Other material: SAM D16562 (three specimens dissected), Parachilna Gorge Rd. , approx. 9 km N of Blinman, Flinders Ranges, in rock crevices, 18 Aug. 1984, H. Anderson, A. Gackle, K. Gowlett .

Description. External morphology: Shell ( Figures 26E , 27E , 28E ) 4.2–4.5 whorls, light brown, not glossy, spire and apex flattened to slightly raised; otherwise shell shape and sculpture as for genus. Mantle laps and lobes and caudal apparatus as for genus; caudal horn moderately long.

Mantle cavity: As for genus. Mantle with pigmentation of black and white spots.

Digestive system: As for genus.

Genital system ( Figures 22H , 24E ): As for genus. Vagina long. Penis long; epiphallus enters penis through simple pore; penis internally covered in three to four longitudinal rows of flat, ridged, diamond-shaped pustules. Penial sheath extremely thick and muscular, thicker than diameter of penis, enclosing only penis; penis retractor muscle attached to epiphallus. Epiphallus approximately equal to penis length, internally with longitudinal pilasters. Diverticulum at junction of epiphallus and vas deferens in form of very short lime-sac (thinwalled, no axial filament).

Radula: Not examined.

Range and habitat. This species is found throughout the Flinders Ranges, South Australia, in rock outcrops and crevices.

Remarks. Periclocystis ardeni can be distinguished from members of Echonitor , with which it overlaps in range, by its flatter, non-glossy shell with a rapidly descending last whorl.

Figures

FIGURE 22. Penis interiors. A. Nitor circumcincta, AM C356607. B. Nitor subrugata, AM C334537. C. Pravonitor kreffti, AM C425415. D. Expocystis rustica, AM C425540. E. Malandena suturalis, AM C425085. F. Echonitor cyrtochila, SAM D16557. G. Echonitor albumenoidea, SAM D16567. H. Periclocystis ardeni, SAM D16562. I. New Caledonian NC3, MNHN no registration number. J. New Caledonian NC5, MNHN no registration number. K. Caldwellia angularis, AM C205299. L. Caldwellia imperfecta, AM C205300. Scale bars 1 mm (A–L). Abbreviations: ep, epiphallus; pd, penial diverticulum; pp, penial pilaster; ppd, diamond-shaped, ridged pustules; prm, penis retractor muscle; ppu, penial pustules; pv, penial verge.

FIGURE 24. Reproductive systems. A. Malandena suturalis, AM C425085. B. Westracystis lissus, FMNH 211717. C. Echonitor cyrtochila, SAM D16557. D. Echonitor albumenoidea, SAM D16567. E. Periclocystis ardeni, SAM D16562. F. Tarocystis responsivus, AM C425327. G. New Caledonian species NC3, MNHN no registration number. H. New Caledonian species NC5, MNHN no registration number. Scale bars 1 mm (C, G), 2 mm (A–B, D–F, H). Abbreviations: alb, albumen gland; bc, bursa copulatrix; c, caecum; ep, epiphallus; fl, flagellum; fov, free oviduct; her, hermaphrodite duct; m, muscle attaching penial sheath to epiphallus (only shown in D & G); ov, ovotestis; p, penis; pr, prostate; prm, penis retractor muscle; pt, penial sheath; t, talon; ut, uterus; v, vagina; vd, vas deferens.

FIGURE 26. Shells, dorsal view. A. Westracystis lissus, BMNH 90.12.30.80–4 (S). B. Westracystis lissus, AM C64901 (S of W. tentus). C. Echonitor cyrtochila, BMNH 1922.8.29.16 (H). D. Echonitor albumenoidea, AM C60533 (H). E. Periclocystis ardeni, AM C60541 (H). F. Tarocystis responsivus, AM C104308 (S). G. Conueplecta (Durgellina) calculosa, AM C374873. H. Coneuplecta (Nevelasta) pampini, AM C126763. Scale bars 2 mm (B, G–H), 3 mm (A, C–F). Photographs by M. Allan (F), H. Barlow (B, G–H), D. Beechey (D–E), W. Ponder (A, C). Abbreviations: H, holotype; S, syntype.

FIGURE 27. Shells, lateral view. A. Westracystis lissus, BMNH 90.12.30.80–4 (S). B. Westracystis lissus, AM C64901 (S of W. tentus). C. Echonitor cyrtochila, BMNH 1922.8.29.16 (H). D. Echonitor albumenoidea, AM C60533 (H). E. Periclocystis ardeni, AM C60541 (H). F. Tarocystis responsivus, AM C104308 (S). G. Conueplecta (Durgellina) calculosa, AM C374873. H. Coneuplecta (Nevelasta) pampini, AM C126763. Scale bars 2 mm (B, G–H), 3 mm (A, C–F). Photographs by H. Barlow (B, F–H), D. Beechey (D–E), W. Ponder (A, C). Abbreviations: H, holotype; S, syntype.

FIGURE 28. Shells, ventral view. A. Westracystis lissus, BMNH90.12.30.80–4 (S). B. Westracystis lissus, AM C64901 (S of W. tentus). C. Echonitor cyrtochila, BMNH 1922.8.29.16 (H). D. Echonitor albumenoidea, AM C60533 (H). E. Periclocystis ardeni, AM C60541 (H). F. Tarocystis responsivus, AM C104308 (S). G. Conueplecta (Durgellina) calculosa, AM C374873. H. Coneuplecta (Nevelasta) pampini, AM C126763. Scale bars 2 mm (B, G–H), 3 mm (A, C–F). Photographs by H. Barlow (B, F–H), D. Beechey (D–E), W. Ponder (A, C). Abbreviations: H, holotype; S, syntype.