Contributions to Zoology, 86 (1) – 2017Isabel T Hyman; Irantzu de la Iglesia Lamborena; Frank Köhler: Molecular phylogenetics and systematic revision of the south-eastern Australian Helicarionidae (Gastropoda, Stylommatophora)

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Parmavitrina maculosa sp. nov.

Figs 22E, 30

Material examined. Holotype. AM C.448344 (near Coffs Harbour, Orara East SF, Bruxner Park Flora Reserve, cnr Bruxner Park Rd and Sealy Lookout road, NSW, 30° 15’ 02” S, 153° 06’ 30” E, tall open Blackbutt forest, Imperata/Themeda/Lomandra groundcover, under burnt hardwood logs, 14/9/2005).

Paratypes. AM C.532840. Same data as holotype.

Non-type material. See Table S1.

Description. Shell. Large, 2.5 whorls, golden-amber, strongly ear-shaped, flattened; last whorl extremely large and flared with membraneous base; shell glossy, very faint, indistinct spirals visible on protoconch and teleoconch (Fig. 22E).

Animal (in spirit). Grey, with prominent grey spots on tail, mantle lobes and shell lappets; mid field of sole slightly darker than outer fields, slime network prominent, tail keeled, caudal horn small. Mantle lobes large, left and median lobes fused to form a large cephalic shield; shell lappets moderate size, right lappet rounded.

Genitalia. Bursa copulatrix long, more than twice length of free oviduct, sac slender. Penis very short, penis and part of epiphallus enclosed in thin penial tunica, penis interior with longitudinal pilasters, two strong and six weaker. Epiphallus approximately 2-2.5 times penis length; enters penis through a short verge. Epiphallic flagellum with spiraling rows of internal cryptae and slender tail. Spermatophore not observed (Fig. 30).


Fig. 30. Reproductive anatomy of Parmavitrina maculosa. A. Genitalia, AM C.532840. B. Penial interior, AM C.344211. Abbreviations: alb, albumen gland; bc, bursa copulatrix; cg, capsule gland; ep, epiphallus; fl, flagellum; her, hermaphroditic duct; ov, ovotestis; p, penis; pp, penial pilasters; pr, prostate; prm, penial retractor muscle; pt, penial tunica; pv, penial verge; ut, uterus; vd, vas deferens. Scale bars: A = 4 mm, B = 1 mm.

Remarks. Parmavitrina maculosa, preliminarily identified as ‘Helicarionidae sp. NN 6’ through curatorial work, is only known from in or around Bruxner Park Flora Reserve, north of Coffs Harbour in northern NSW, in open blackbutt and moist sclerophyll forests. It is represented by very few specimens in the collections of the AM and the QM and has not been observed live, so comparative comments on its external appearance are based only on preserved specimens.

This species is larger than its congeners, with a more widely flared aperture and the shortest penis length relative to body size.

Etymology. From maculosa (Latin = spotted; adjective), referring to spots on both sides of the tail.