Comboynea winghamensis, Shea & Colgan & Stanisic, 2012

Shea, M., Colgan, D. J. & Stanisic, J., 2012, 3585, Zootaxa 3585, pp. 1-109 : 72-73

Comboynea winghamensis n. sp.

( Figs 29D; 31D; 33D; 35D; 37D)

Etymology. For the type locality, Wingham Brush Nature Reserve.

Diagnosis. Shell very small, orange-brown, biconcave with depressed spire. Protoconch sculpture primarily spiral consisting of 17 to 22 prominent, crowded, low, broad spiral cords and very weak, irregularly spaced, underlying radial growth ridges. Teleoconch sculpture of numerous, prominent, very crowded and quite uniformly spaced, slightly sinuate, opisthocline radial ribs. Ribs on body whorl 162–228 (mean 177). Umbilicus narrow U-shaped.

Type material examined. Holotype. AM C.171399, Wingham Brush Nature Reserve , Wingham , Manning River, west of Taree, NSW (31° 52' 15" S, 152° 22' 51" E), 5. ii.1982, coll. M. Shea. Paratypes. AM C.472880, same data as holotype. Wingham Brush : QMMO31856 , QMMO44829 .

Description. Shell very small, orange-brown, biconcave with depressed spire. Whorls 3.87–4.12, tightly coiled, the last inflated and descending in front. Sutures strongly impressed. Shell diameter 3.60–3.98 mm (mean 3.77 mm), height 1.94–2.20 mm (mean 2.06 mm), H/D 0.52–0.58 (mean 0.54). Protoconch flat, of 1.12 whorls, diameter 0.41–0.58 mm. Protoconch sculpture primarily spiral consisting of 17 to 22 prominent, crowded, low, broad spiral cords and very weak, irregularly spaced, underlying radial growth ridges. Teleoconch sculpture of numerous, prominent, very crowded and quite uniformly spaced, slightly sinuate, opisthocline radial ribs. Ribs on body whorl 162–228 (mean 177), width of interstices on the first teleoconch whorl equal to or greater than width of four ribs; on the penultimate whorl equal to width of four to greater than or equal to width of six ribs; each rib with two or more periostracal blades. Interstitial sculpture of low prominent microradial ribs and low, weaker microspiral cords forming weak beads at their intersection; number of microradials between ribs on the first teleoconch whorl 8–10; on first quarter of body whorl 5–6. Aperture narrowly ovately-lunate. Parietal callus prominent, transparent. Umbilicus narrow U-shaped, diameter 0.92–1.27 mm (mean 1.07 mm), D/U 2.95–4.05 (mean 3.54). Based on 10 measured adults.

Anatomy unknown.

Distribution and habitat: Wingham Brush Nature Reserve, Wingham, Manning River, west of Taree, NSW; found in subtropical rainforest, living on underside of logs and wood.

Remarks. Comboynea winghamensis n. sp. superficially resembles Co. boorganna n. sp. found at higher altitudes but has a significantly higher rib count and slightly wider umbilicus. This species apparently is the sole planispiral/biconcave charopid taxon at the type locality at Wingham Brush, whereas Co. boorganna occurs sympatrically with at least two other planispiral charopids on the Comboyne Plateau. Anatomical and molecular data are unknown for this species. However the protoconch sculpture is unequivocally Comboynea .