Sinployea haupatoto Climo, Mahlfeld & Roscoe, 2025

Mahlfeld, Karin, Climo, Frank & Roscoe, David, 2025, Systematics, conservation status, and biogeography of 16 new species of Sinployea Solem, 1983 (Gastropoda: Charopidae) from New Zealand, Zoological Journal of the Linnean Society 204 (1) : -

Sinployea haupatoto Climo, Mahlfeld & Roscoe sp. nov.

( Figs 16, 19B, 21, 44)

Flammocharopa n. sp. ‘a’ Goulstone et al. 1993: 8.

Sinployea ‘hazelwoodi’ McGuinness 2001: 595; Brook 2002: 99.

28 • Mahlfeld et al.

Charopidae sp. 105 (NMNZ M.077007) Hitchmough et al. 2007: 83; Spencer et al. 2009: 216; Mahlfeld et al. 2012: appendix 1.

Material examined: New Zealand, North Island , Northland, SW of North Cape: NMNZ M.077007, holotype ( Figs 19B, 21), Haupatoto, bush edge, 34°27′47.330″S, 172°57′01.870″E, C.C. Ogle and G. Carlin, 4 March 1985 .

Othermaterialexamined: NewZealand, NorthIsland, Northland, NMNZ: M.077030, SW of North Cape , Whareana Stream , 34°27′43.723″S, 172°59′38.587″E, P. Anderson, G. Carlin, and C.C. Ogle, 5 March 1985 .

Description: Shell small, thin, and fragile, 1.8 mm wide and 0.97 mm high at 2.5 whorls, finely ribbed, loosely coiled, narrowly umbilicate with spire hardly emergent. Colour brown with narrow irregular bands and small patches of white that originate near the suture and fade on the shell base, which is chiefly brown. Protoconch of 1.25 convex whorls, translucent, 443 μm wide, sculptured with six to seven thin spiral lirae. Teleoconch of 1.25 rapidly expanding, convex whorls, base slightly flattened. Sculpture consisting of numerous calcareous, thin, primary axials traversed by fine spiral lirae; spirals approximately one-third of the width of primary axials and forming microscopic beads at intersections with even finer secondary axials, about three per interstitial space. Each primary axial is crested with a very fine periostracal lamella, which is often worn off; 74 axials on first teleoconch whorl. Suture deep. Aperture oblique, squarish; columella oblique and a little reflected; lip simple. Umbilicus 356 μm wide (D/U ratio 5.06).

Reproductive anatomy: Unknown.

Etymology: Named after Haupatoto, SW of North Cape, Northland.

Notes: The following specimen lots were not rechecked but are potentially conspecific with S. haupatoto : New Zealand, North Island, Northland, NMNZ: W of North Cape: M.058111, NW of Unuwhao Trig, by Waihi Stream , 34°25′37.954″S, 172°53′10.387″E , D.J. Roscoe, 3 January 1976; M.079030, NE of Unuwhao Peak , 200 m a.s.l., 34°25′47.651″S, 172°53′33.911″E , P.C. Mayhill, April 1983; M.087936, SE Unuwhao Forest , 34°26′00.672″S, 172°53′10.442″E , C.C. Ogle et al., November 1986; Spirits Bay: M.058112, Waterfall Gully, Waitanoni Stream , 34°25′38.041″S, 172°52′15.555″E , D.J. Roscoe, 3 January 1976; SW of North Cape: M.077094, Head of Panaki Swamp , 34°29′01.807″S, 172°58′16.567″E , C.C. Ogle et al., 6 March 1985; M.079018, Whareana Bay , Placostylus colony, 34°27′17.681″S ,

Sinployea systematics and biogeography • 29 173°00′09.836″E, P.C. Mayhill, May 1982; M.079652, W of Te Hapua , 34°29′54.545″S, 172°50′45.970″E, G. Carlin, July 1984 ; M.115994, Haupatoto , 34°27′47.330″S, 172°57′01.870″E, C.C. Ogle et al., 4 March 1985 .

Distribution: New Zealand, Northland, S of North Cape, Haupatoto, and Whareana.

Ecology: Subtropical coastal broadleaf forest–shrubland.

Related species: Sinployea haupatoto in the eastern part of the Cape Reinga–North Cape region is more finely ribbed than S. solemi in the western part of the same region; these are the northernmost Sinployea species. The shell of S. haupatoto is superficially similar to that of S. waipoua , but in S. haupatoto the spire protrusion is stronger, the sutural slope is steeper, and the dorsal whorl profile is more crimped before descending into the suture.

Conservation status: According to records in the Te Papa database, Haupatoto Bush has been sampled for land snails only a few times in the 1980s, 1990s, and early 2000s. More than 370 samples from the surrounding area of NZ 260 map sheet N02 ( Fig. 2) have been checked for occurrences of S. haupatoto for this assessment. This species is probably restricted to the Haupatoto–Whareana area, SW of North Cape. The 2010 NZTCS assessment ranked this species as ‘At Risk: Relict’, with the qualifier ‘Range Restricted’ (RR). A change to ‘At Risk: Naturally Uncommon’ is suggested here, with the qualifiers ‘Data Poor: Size and Trend’ and ‘Biologically Sparse’.