Landouria sewuensis sp. nov.

urn:lsid:zoobank.org:act: 2E324442-51A9-4897-9635-22666EF0E037

Figs 23, 37, 53, 58; Tables 3–4

Landouria cf. rotatoria – Köhler et al. in press: 6 (in part). (not Pfeiffer, 1842)

Diagnosis

Landouria sewuensis sp. nov. is characterized by a brownish-corneous, sharply keeled shell with a wide umbilicus, a penis that is divided into a long, broad distal and a short, narrow proximal part with a globular bulge at its proximal end, a broad flagellum with two rows of broad tubercles and a globular bulge in the distal part of the vagina.

Etymology

Landouria sewuensis sp. nov. is named after its occurrence in the Gunung Sewu karst region.

Material examined

Holotype

INDONESIA • holotype (det. anat.); Gunung Kidul, Tepus, Mbajo Hill, natural forest; 8°08′33″ S, 110°40′59″ E; 249 m a.s.l.; 8 Aug. 2014; A.S. Nurinsiyah, F.L.H. Irsyad, F.J. Sari and E. Nurlaela leg.; D = 15.1 mm, H = 7.1 mm; MZB 19255.

Paratypes

INDONESIA – Central Java • many spec.; Yogyakarta, Gunung Kidul, Kemadang: Pantai Baron; 8°07′43″ S, 110°32′54″ E; 20 m a.s.l.; ZMH 140024 • 2 spec. (det. anat.); Gunung Kidul, Tepus, Cemara Udang Hill, secondary forest; 8°08′55″ S, 110°36′37″ E; 39 m a.s.l.; MZB 19261 • 1 spec.; same data as for preceding; ZMH 133418 • many spec.; Gunung Kidul, Tepus, rock above Poktunggal Beach; 8°09′23″ S, 110°37′22″ E; 10 m a.s.l.; ZMH 140025 • 1 spec. (det. anat.); Gunung Kidul, Tepus, Pego Hill, agroforestry; 8°06′10″ S, 110°37′50″ E; 230 m a.s.l.; MZB 19259 • 1 spec. (det. anat.); Gunung Kidul, Tepus, Pego Hill, agroforestry; 8°06′10″ S, 110°37′51″ E; 244 m a.s.l.; MZB 19258 • 1 spec.; Gunung Kidul, Tepus, near Poktunggal Beach, agroforestry; 8°08′42″ S, 110°37′52″ E; 137 m a.s.l.; MZB 21269 • 3 spec. (det. anat.); same data as for preceding; MZB 19260 • 3 spec.; same data as for preceding; ZMH 79891 • 1 spec. (det. anat.); Gunung Kidul, Tepus, Mbajo Hill, natural forest; 8°08′32″ S, 110°40′58″ E; 281 m a.s.l.; MZB 19257 • 1 spec.; same data as for preceding; ZMH 133419 • 1 spec. (det. anat.); Gunung Kidul, Tepus, Mbajo Hill, natural forest; 8°08′33″ S, 110°40′59″ E; 258 m a.s.l.; MZB 19256 .

Description

SHELL (Fig. 58; Tables 3–4). Depressed conical, with 5.25–6 hardly convex whorls; protoconch almost smooth; teleoconch with fine, irregular wrinkles; apical side with indistinct incised spiral lines, umbilical side with more distinct spiral lines; scaly processes, if present, at periphery; tuberculate around umbilicus; brownish-corneous; body whorl sharply keeled; aperture rounded rhombic; upper insertion of peristome slightly descending; peristome expanded, reflexed and slightly thickened; umbilicus slightly eccentric, wide, comprising 30–40% of shell diameter, hardly obscured by columellar edge.

GENITALIA (Figs 23, 37; Table 4). Atrium short; penis long, distal part broad, shorter proximal part narrow, with a globular swelling at proximal end; without penis coecum; membranaceous sheath around distal part of penis connected with proximal part of epiphallus by tissue; penial retractor runs from diaphragm to middle of cylindrical epiphallus; flagellum moderately long, broad, with two rows of broad tubercles at margin, tapering towards its proximal end; without node; vas deferens narrow and long; vagina long, distally globularly dilated, constriction towards its middle, becoming broader again towards its proximal end; oviduct short, broad, proximally tapering; peduncle of bursa copulatrix subdivided into a broader, cylindrical distal part and a narrower, longer proximal part, ending in an elongate oval bursa beside albumen gland. Right ommatophoral retractor runs between penis and vagina.

Remarks

The shell of L. sewuensis sp. nov. cannot be reliably distinguished from those of L. sukoliloensis sp. nov. (Fig. 59) or L. intumescens (Figs 72–74). Landouria sewuensis sp. nov. differs from these species in the division of the penis into a long, broad distal and a short, narrow proximal part with a globular bulge at its proximal end, the broad flagellum with two rows of broad tubercles and the globular bulge in the distal part of the vagina.

Landouria sewuensis sp. nov. occurs sympatrically with L. tholiformis sp. nov. (Fig. 51). For differences, see remarks under that species.

A sequence of L. sewuensis sp. nov. was included in the phylogenetic analysis of Köhler et al. (in press: fig. 2; ZMH 79891; erroneously labelled “ Sumatra ”) under the name L. cf. rotatoria (not Pfeiffer, 1842).

Distribution

Landouria sewuensis sp. nov. is endemic to the Gunung Sewu karst region in Gunung Kidul Regency (Fig. 53).