Dicharax notus (Godwin-Austen, 1914)
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https://dx.doi.org/10.3897/zse.97.59143 |
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lsid:zoobank.org:pub:1D5553BA-2489-4F2C-9527-B7E46B9B432B |
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https://treatment.plazi.org/id/90E261C7-B5A8-5C02-872F-8A21A5CAD9EA |
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scientific name |
Dicharax notus (Godwin-Austen, 1914) |
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Dicharax notus (Godwin-Austen, 1914) Figs 4C, D View Figure 4 , 5B View Figure 5 , 6E View Figure 6 , 7A, B View Figure 7
Alycaeus notus Godwin-Austen, 1914: 411, pl. 155, fig. 12. Type locality: Fort Stedman, Burma [Maing Thauk or Mine Thauk located in the east side of Inle Lake south of Nyaungshwe, Nyaungshwe Township, Taunggyi District, Shan State, Myanmar].
Alycaeus (Dicharax) notus - Gude 1921: 262.
Dicharax notus - Páll-Gergely et al. 2020b: 69.
Type material examined.
Syntypes NHMUK 1903.7.1.3065 from Fort Stedman (15 shells; Fig. 4C View Figure 4 ).
Other material examined.
CUMZ 7425 from Tham Luang Sa Koen , Nan Province, Thailand, 19°22'00.1"N, 100°32'28.4"E, 19 Jan. 2017, coll. C. Sutcharit, A. Pholyotha (174 shells and 13 specimens in ethanol; Figs 4D View Figure 4 , 5B View Figure 5 , 6E View Figure 6 , 7A, B View Figure 7 ) GoogleMaps .
Diagnosis.
Shell small (SH up to 2.2 mm, SW up to 3.6 mm), depressed-conical. Spire ca. 1/5 of shell height. R1 with regular ribs; R2 as long as or shorter than R3; R2 with 48-50 ribs. R3 with low blunt central swelling, more elevated in newly examined population. Aperture round. Inner peristome without indentation, with parieto-columellar angle in newly examined population. Outer peristome expanded, reflected. Umbilicus round. Operculum multispiral either with or without elevated lamella.
Distribution.
Shan State, Myanmar ( Gude 1921), and Nan Province, Thailand.
Remarks.
Similar to D. cristatus ( Möllendorff, 1886) from China and Vietnam as well as D. depressus (Bavay & Dautzenberg, 1912) and the rounded peristome morph of D. fimbriatus (the latter two known from Pac Kha, northern Vietnam) in shell size and shape, length of R2 and R3, and position of the swelling in R3 ( Páll-Gergely et al. 2017). The specimens from Nan Province, Thailand (Fig. 4D View Figure 4 ) differ from the type specimens in having a longer R3, a more shouldered R3 swelling, a stronger descending aperture, and a parieto-columellar angle. Despite those differences, we preliminarily identified the specimens from Nan Province as D. notus . Refer to Discussion regarding the color of living specimen and variation in operculum morphology.
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Dicharax notus (Godwin-Austen, 1914)
Jirapatrasilp, Parin, Pall-Gergely, Barna, Sutcharit, Chirasak & Tongkerd, Piyoros 2021 |
Alycaeus notus
Godwin-Austen 1914 |
Alycaeus (Dicharax) notus
Godwin-Austen 1914 |