Cyclophorus phlegethon Godwin-Austen, 1889
“This is a smooth depressed species with convex whorls, a wide umbilicus, and the peristome scarcely expanded or reflected excepting towards the umbilicus. The first two or three whorls have stronger and more distant lines of growth than the last and penultimate whorls, the change of sculpture being marked by a distinct line which apparently indicates the termination of the first season's growth. In young and very fresh specimens the fine incremental lines have the appearance of being minutely granular. The wavy or more or less zigzag whitish markings almost disappear upon the last third of the body-whorl. Beneath the blackish peripherial zone, the dark chestnut ground-colour extends about five or six millimetres, the rest of the base being of a paler tint.” (E.A. Smith, 1894)
Godwin-Austen (1889) original descriptions on Cyclophorus phlegethon – “Shell depressedly turbinate, subangulate on periphery, openly and widely umbilicated; sculpture a smooth surface; colour a rich dark madder-brown, crossed by fine zigzag continuous pale lines; spire low; apex blunt and rounded; suture impressed; whorls 4, at apex closely wound, and increasing rapidly after 2½ have been formed; aperture circular, sub-oblique; peristome simple, slightly reflected.”
E. A. Smith (1894) original descriptions from Cyclophorus everetti – “Testa depressa, orbicularis, latissime et perspective umbilicata, saturate castanea, ad peripheriam zona angusta nigrescente superne pallide marginata cincta, lineis albidis irregularibus undulatis subzigzag-formibus ornata; anfractus 4-4.5, convexi, sutura profunda sejuncti, lineis incrementi tenuibus obliquis sculpti, ultimus antice descendens, infra pallidior; apertura sordide caerulescens, ovato-circularis, latior quam alta; peristoma leviter incrassatum, sordide albidum, superne haud expansum, ad marginem columellarem subreflexum.”
Kobelt (1902) descriptions on Cyclophorus (Salpingophorus) phlegethon – “Schale weit und offen genabelt, niedrig kreiseiförmig, in der Mitte stumpfkantig, ziemlich glatt, lebhaft braun mit blasseren Zickzacklinien; Apex stumpf; Naht eingedrückt; 4 Windungen, die 2½ obersten langsam, die folgenden sehr schnell zunehmend; Mündung ziemlich schräg, kreisrund; Mundrand einfach, leicht ausgebreitet.
Kobelt (1902) descriptions on Cyclophorus (Salpingophorus) everetti – “Schale sehr weit und durchgehend genabelt, scheibenförmg, tief kastanienbraun mit schmalem, schwärzlichem, oben hell gerandetem Mittelband und weissen unregelmässigen Zickzacklinien; 4-4½ gewölbte Windungen mit tiefer Naht, fein gestreift, letzte vorn herabsteigend, unten heller; Mündung schmutzig bläulich, kurz eiförmig, breiter als hoch; Mundrand leicht verdickt, schmutzig weiss, oben nicht ausgebreitet; Spindelrand leicht zurückgeschlagen.”
Vermeulen (1999) descriptions on Cyclophorus phlegethon – “Shell whitish, but with an irregular zig-zag pattern of dark brown usually leaving only patches of the ground colour, with a row of pale spots at the periphery, with a wide band of darker brown below the periphery; umbilical region whitish to pale brown. Spire depressed, apex only slightly raised. Whorls 3½-4, well-rounded, periphery with or without a slight, obtuse edge. Suture distinctly channelled from the start of the teleoconch onwards. Spiral sculpture absent or nearly so. Umbilicus 6.5-8.5 mm wide, not covered by the peristome. Peristome dull whitish or pale brownish, only slightly thickened and reflected except on the collumellar side; either simple, or double with the inner peristome protruding up to 2 mm from the outer.”
Cyclophorus phlegethon – “Size: maj. diam. 39, min. 20; alt. axis 13.5; body-whorl alt. 18.25 millim.” (Godwin-Austen, 1889); Cyclophorus everetti – “Diam. maj. 37 mm, min. 26 mm; alt. 20 mm. Apertura 18 mm lata, 15 mm alta.” (E. A. Smith, 1894); Cyclophorus phlegethon – “Height 18.5-21 mm, width 34-41 mm; height aperture 15-18 mm, width 17.5-21 mm.” (Vermeulen, 1999)
BORNEO – Sarawak (Malaysia); Mount Molu (Hungerford); Mount Barit (NW. Borneo); trail to Clearwater caves, Mulu National Park (Marzuki, M. E./2008)
“Found in forest on or near limestone outcrops. Recorded from lowland to up to 1200 m asl.” (Vermeulen, 1999)