Everettia minuta, Marzuki & Liew & Mohd-Azlan, 2021

Marzuki, Mohammad Effendi bin, Liew, Thor-Seng & Mohd-Azlan, Jayasilan, 2021, Land snails and slugs of Bau limestone hills, Sarawak (Malaysia, Borneo), with the descriptions of 13 new species, ZooKeys 1035, pp. 1-113 : 1

publication ID

https://dx.doi.org/10.3897/zookeys.1035.60843

publication LSID

lsid:zoobank.org:pub:ED19022E-A170-4DB7-9587-FEFE15D07854

persistent identifier

https://treatment.plazi.org/id/D8EF63CB-DA58-4A13-B619-10D768EF6117

taxon LSID

lsid:zoobank.org:act:D8EF63CB-DA58-4A13-B619-10D768EF6117

treatment provided by

ZooKeys by Pensoft

scientific name

Everettia minuta
status

sp. nov.

Everettia minuta sp. nov. Figures 41C View Figure 41 , 42A-C View Figure 42

Material examined.

Holotype (SH 5.72 mm, SW 10.00 mm) (MZU.MOL.20.23), Malaysia, Sarawak, Kuching Division , Fairy Caves (Site 1), south part of Gunung Kapor, 4 miles SW Bau, 1°22'53.76"N, 110°7'4.34"E, coll. M. E. Marzuki, 8.IV.2017 GoogleMaps . Paratypes: 7 ex. (ME0008965), same data as the holotype GoogleMaps ; 1 ex. (MZU.MOL.20.24), the same locality as the holotype, coll. M. E. Marzuki, 23.VI.2010 GoogleMaps ; 5 ex. (ME0001512), the same locality, coll. M. E. Marzuki, 11.III.2011 GoogleMaps ; 1 ex. (ME0001513), Gunung Batu , limestone outcrop along Skio road, Jambusan, 2.4 miles E Bau, 1°23'50.65"N, 110°11'19.99"E, coll. M. E. Marzuki, 11.III.2011 GoogleMaps ; 4 ex. (ME0009139), Lobang Angin ( Site 1), limestone outcrop near Sungai Sarawak Kanan, 1.75 miles W of Bau, 1°24'48.14"N, 110°8'12.21"E, coll. M. E. Marzuki, 15.IV.2017 GoogleMaps ; 1 ex. (ME0009222), Lobang Angin ( Site 2), limestone outcrop near Sungai Sarawak Kanan, 1.75 miles W of Bau, 1°24'51.01"N, 110°8'13.48"E, coll. M. E. Marzuki, 16.IV.2017 GoogleMaps ; 1 ex. (ME0009466), Serian Division; Gunung Storib, small northern peak of Gunung Silabor, 15 miles S Serian, 0°57'30.75"N, 110°30'3.00"E, 22.IX.2017 GoogleMaps .

Differential diagnosis.

The new species is similar to Everettia jucunda (Pfeiffer, 1863), E. bangueyensis (Smith, 1895) and E. jucundior Liew, Vermeulen & Schilthuizen, 2009 from Sabah. Everettia jucunda differs by having a larger shell (<17.3 mm wide), with one and half more whorls. Everettia jucundior differs by having a larger shell (<19.5 mm wide) with slightly shouldered whorls. Everettia bangueyensis differs by having a smaller shell (<9.0 mm wide), and a flat spire with slightly shouldered whorls.

Description.

Shell small, rather thin, translucent, pale brown, spire moderately elevated. Surface with a glossy lustre. Whorls convex. Number of whorls < 5¼. Protoconch almost smooth, spiral striation absent with inconspicuous radial threads near the suture. Teleoconch: spiral sculpture with inconspicuous, densely placed spiral grooves on both apical side and apertural sides. Radial sculpture almost smooth, with inconspicuous radial threads near suture and below periphery. Periphery round; suture slightly depressed. Aperture lunulate. Peristome simple; continuous, somewhat sinuous, thickened, and reflected on columellar side, not thickened nor reflected on basal and palatal sides. Umbilicus narrow, partly covered by the reflected peristome; umbilical region moderately concave. Dimensions: shell height <7.62 mm; shell width <13.17 mm; diameters of the first three whorls 1.45 mm, 2.40 mm, and 4.34 mm, respectively; aperture height <4.65 mm; aperture width <6.58 mm.

Geographic distribution and habitat.

Known from the Bau and Serian-Padawan limestone hills. Only dry shells were not found during the surveys.

Etymology.

From the Latin Everettia minuta , meaning small, in reference to the smaller shell compare to other species of Everettia from Sarawak.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Stylommatophora

Family

Dyakiidae

Genus

Everettia