Australdonta anneae, Sartori, André F., Gargominy, Olivier & Fontaine, Benoît, 2013

Sartori, André F., Gargominy, Olivier & Fontaine, Benoît, 2013, Anthropogenic extinction of Pacific land snails: A case study of Rurutu, French Polynesia, with description of eight new species of endodontids (Pulmonata), Zootaxa 3640 (3), pp. 343-372 : 353

Australdonta anneae sp. nov.

Figures 3 B, 5, 14B, 15B

Examined material (3 specimens). Holotype: MNHN 25197, Rr43. Paratypes: MNHN 25198, 2 shells, Rr38.

Diagnosis: Shell with a very deep supraperipheral groove, without flammulations; aperture displaying only a few barrier traces (one palatal and one or two parietals).

Description: Shell depressed, white to light fawn, without markings. Shell thin, sub-pellucid to pellucid; periostracum adherent, shiny. Spire barely elevated, descending at an irregular rate and ascending slightly for approximately the first half of the second whorl. Whorls keeled peripherally and supraperipherally, imbricated; apical suture canaliculate, umbilical suture impressed. Transition between protoconch and teleoconch indistinct. Protoconch and initial teleoconch rounded in cross-section; developing a deep supraperipheral groove extending approximately from the first quarter of the third whorl onwards, delimiting two rounded keels. Protoconch sculptured by very fine spiral and axial lirae, forming a reticulated pattern; spiral lirae wobbly in aspect, fading on the transitional zone between protoconch and teleoconch. Axial lirae progressively transitioning into more crowded and slightly coarser riblets, with interspaces approximately twice their width, overlaying the primary axial sculpture of the teleoconch. Primary axial sculpture formed by broad, low ribs or undulations of the external shell surface, with interspaces two to three times their width. Straight spiral riblets visible on portions of the teleoconch surface, often in the vicinity of the apical suture. Umbilicus wide, shallow. Peristome subovate, constricted by deep sulcus between peripheral and supraperipheral keels. Apertural barriers represented by one palatal and one or two parietal traces, all extending inwards beyond the line of vision from the peristome. Palatal trace supraperipheral, positioned very near the suture, slightly narrower and less projecting than parietal traces. First parietal trace, when present, located very near the suture; second parietal trace in the middle of the parietal lip. Other shell features that can be expressed numerically are shown in Table 2 .

Remarks: A deep supraperipheral groove demarcating two prominent keels is a unique feature of this species, which easily distinguishes it from A. oheatora and from the further related A. magnasulcata , A. magnasulcatissima and A. sulcata .

Etymology: This species is dedicated to Anne Fontaine, wife of the third author.

Figures

FIGURE 3. Holotypes of: A. Australdonta oheatora sp. nov.; B. A. anneae sp. nov.; C. A. sibleti sp. nov.; D. A. florencei sp. nov. Scale bars = 1 mm.