Amphidromus (Amphidromus) cambojiensis ( Reeve, 1860 )

Sutcharit, Chirasak, Naggs, Fred, Ablett, Jonathan D., Sang, Pham Van, Van Hao, Luong & Panha, Somsak, 2021, Anatomical note on a tree snail Amphidromus (Amphidromus) cambojiensis (Reeve, 1860) from Vietnam (Eupulmonata: Camaenidae), Journal of Natural History 55 (17 - 18), pp. 1059-1069 : 1060-1065

publication ID

https://doi.org/ 10.1080/00222933.2021.1933230

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https://treatment.plazi.org/id/03C9630F-0B45-FFEA-FF4D-7946C124FB49

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Plazi

scientific name

Amphidromus (Amphidromus) cambojiensis ( Reeve, 1860 )
status

 

Amphidromus (Amphidromus) cambojiensis ( Reeve, 1860) Figures 1–3 View Figure 1 View Figure 2 View Figure 3

Bulimus cambojiensis Reeve, 1860 : Type locality: Cambodia. Pfeiffer 1862: 11, 12. Pfeiffer 1868: 16. Bulimus cambogiensis [sic!] – Pfeiffer 1877: 23. Amphidromus cambojiensis – Fischer 1891: 114. Fulton 1896: 91, pl. 7, fig. 7. Pilsbry 1900: 177, 178, pl. 59, fig. 32. Laidlaw and Solem 1961: 529, 607. Richardson 1985: 10. Abbott 1989: 160, text figure. Sutcharit et al. 2015: 62, fig. 4f, g. Thach 2017: figs 459, 462. Thach 2018: figs 607, 608. Páll-Gergely et al. 2020: 51. Bulimus perversus var. cambodjiensis [sic!] – Morelet 1875: 260, 261. Amphidromus lamdongensis Thach & Huber in Thach 2016: 67, figs 32, 339–342. Type locality: Dambri area of Lam Dong Province (Central Vietnam) . Amphidromus schileykoi Thach, 2016: 68 , figs 39, 381–383. Type locality: Ha Tien , Kien Giang Province (Southwest Vietnam) . Amphidropmus montesdeocai Thach & Huber in Thach 2017: 43, figs 454–458 . Type locality: Dinh Quan District along National road no . 20, Dong Nai Province, South Vietnam .

Material examined. Lectotype of Bulimus cambojiensis NHMUK 19601468/1 (1S; Figure 1 View Figure 1 (a)), paralectotypes NHMUK 19601468 View Materials /2–3 (1S+1D) . Holotype of A. schileykoi, NHMUK 20160297 (1S; Figure 1 View Figure 1 (e)). CAMBODIA: NHMUK 19601467 View Materials (1D juvenile shell), NHMW Rusnov ex Rolle coll. (1S shell). VIETNAM: Cochin China: ZMA. MOLL.395799, leg. Wright (1D shell). Lodge gardens, Cat Tien National Park, Vietnam (11°25ʹ24”N, 107°25ʹ43” E): NHMUK 20130819 View Materials (2S+1D in ethanol; Figure 1 View Figure 1 (b,c), 2). Thac Dambri Waterfall, Dambri, Bao Loc, Lam Dong, Vietnam (11°38ʹ26.7”N, 107°44ʹ33.6”E): NHMUK 20210004 View Materials (1S in ethanol; Figures 1 View Figure 1 (d), 3). Forest trail, Nam Cat Tien National Park , Dong Nai, Vietnam : ZRC.MOL.03 (1D in ethanol; Figure 3 View Figure 3 ) GoogleMaps .

Shell. Shell large (height up to 75 mm), dextral or sinistral, solid, and ovate conic. Apex acute with white or dark colour; spire long, conical with white or pale rose-pink colour. Shell surface generally smooth; 6 to 7 convex whorls; suture wide and depressed. Last whorl ovate; one or two dark varices generally present on penultimate or last whorl. Periostracum thin, corneous or with oblique brownish radial streaks; shell with irregular brown to dark-brown radial streaks. Aperture broadly ovate; inner surface of outer wall with bright purplish-pink or violet colour. Peristome whitish; lip thickened, expanded, and reflexed, but not attached to last whorl. Parietal callus thickened and white. Columella white, straight, or little twisted; umbilicus imperforate.

Living specimen. Animals with pale brown body covered with reticulated skin. Foot broad and long with uniform pale brownish colour to posterior tail. Head with bright orange patch covering tentacles and mouthparts. Upper tentacles drumstick shaped, orange-brown to dark, with dark eyespots on tentacular tips; lower tentacles short and orange in colour ( Figure 3 View Figure 3 ).

Genital system. Atrium relatively long. Penis slender, conical, and short (about half of vagina length). Penial retractor muscle thickened and inserted on epiphallus near penis. Epiphallus long, slender tube, coiled and twisted upon itself. Flagellum long, extending from epiphallus and terminating in slightly enlarged folded coil. Appendix small, longer than flagellum and about same length as epiphallus. Vas deferens small tube passing from free oviduct and terminating at epiphallus-flagellum junction ( Figure 2 View Figure 2 (a)). Internal wall of penis corrugated, exhibiting series of thickened and swollen longitudinal penial pilasters (pp) forming fringe around penial wall, and with nearly smooth to weak folds around base of penial verge. Penial verge (pv) short conic with nearly smooth surface ( Figure 2 View Figure 2 (b)).

Vagina (v) slender, long, cylindrical, and about two times longer than penis length. Gametolytic duct (gd) enlarged cylindrical tube abruptly tapering to a small tube terminally and connected to elongate gametolytic sac (gs). Free oviduct (fo) short; oviduct enlarged to form lobule alveoli. Albumen gland (ag) slightly small and lingulate. Hermaphroditic gland (hg) composed of numerous small lobules; narrow and convoluted hermaphroditic duct (hd) connects gland and middle of talon ( Figure 2 View Figure 2 (a)). Internal wall of vagina possesses corrugated ridges near genital orifice, ridges become thinner and smooth longitudinal vaginal pilasters (vp), and swollen with irregularly shaped and deep crenellations near free oviduct opening ( Figure 2 View Figure 2 (b)).

Distribution. The published records and museum specimens of A. (A.) cambojiensis are quite vague and only ‘Cambodia’ is given as the collection locality. Originally, it was published together with the now endangered species, Bertia cambojiensis ( Reeve, 1860) , which has the same type locality. The type specimens were received from the famous French naturalist Henri Mouhot ( Reeve 1860). For over 160 years after Reeve’s description of ‘ Bulimus cambojiensis ’, there were no specific distribution records, and it was thought to be a ‘lost species’ ( Abbott 1989). Fortunately, the re-description works on Bertia cambojiensis clarified its type locality, which was probably in the vicinity of ‘Brelum’, Vietnam, and neighbouring areas in Cambodia (see Sutcharit et al. (2019) for more detail).

This recent collection has revealed that the range of this species includes the south of Vietnam, and it probably also occurs in Cambodia ( Figure 3 View Figure 3 ). However, more precise locality records of this species in Cambodia will require intensive surveys.

Remarks. Based solely on shell morphology, A. (A.) cambojiensis is superficially like A. (A.) schomburgki ( Pfeiffer, 1860) and A. laosianus Bavay, 1898 . However, the relatively large shell size (height> 60 mm), white apertural lip, and purplish-pink colour on the inside of the aperture are clear differences from these two other species. In contrast, A. (A.) schomburgki has a greenish periostracum, white or purplish ground shell, and dark purple apertural lip and callus; A. laosianus possesses an elongate shell with brown radial streaks, and rose-pink lip, callus and inside aperture ( Pfeiffer 1860; Bavay 1898; Sutcharit and Panha 2006b; Sutcharit et al. 2015; Inkhavilay et al. 2019). The genitalia of A. (A.) schomburgki have a series of protuberances arranged on penial pilasters, and smooth vaginal pilasters located near the genital orifice covering about half of the chamber, while A. (A). cambojiensis has smooth penial pilasters, and vaginal pilasters with deep crenellations near the genital orifice and near the free oviduct, but smooth in middle ( Sutcharit and Panha 2006b).

Laidlaw and Solem (1961) noted that A. (A.) cambojiensis was probably closely related to A. placostylus Mӧllendorff, 1900a and A. ingens Mӧllendorff, 1900b from Vietnam. They were placed together into an intermediate species-group that could not be appropriately assigned to any subgenera ( Laidlaw and Solem 1961). From this study, the genitalia characteristics of a long epiphallus, flagellum, and appendix suggest it is a member of the nominotypical subgenus ( Schileyko 2003; Sutcharit and Panha 2006b). The shell characters distinguishing A. (A.) cambojiensis from A. placostylus and A. ingens are the white apertural lip and callus, and purplish-pink colour inside the aperture ( Pilsbry 1900; Möllendorff 1900a, 1900b; Zilch 1953). In contrast, A. ingens ( Figure 1 View Figure 1 (g)) has a monochrome whitish shell, last whorl large ovate, with two spiral indentations (one below suture and one on periphery) and flattened whorls; A. placostylus ( Figure 1 View Figure 1 (f)) has a slightly larger shell (height 75 mm), ovate last whorl, brownish-streaked shell, and dark brown colour on the lower half of the last whorl. Unfortunately, these two species are known only from dry shells and A. placostylus is known only from the holotype. Hence, the current relationship and subgeneric assignment of the two species needs further revision, and future attempts should consider including more information on reproductive anatomy and distribution ranges to improve the taxonomy of Amphidromus in general.

NHMW

Naturhistorisches Museum, Wien

ZMA

Universiteit van Amsterdam, Zoologisch Museum

ZRC

Zoological Reference Collection, National University of Singapore

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Stylommatophora

Family

Camaenidae

Genus

Amphidromus

Loc

Amphidromus (Amphidromus) cambojiensis ( Reeve, 1860 )

Sutcharit, Chirasak, Naggs, Fred, Ablett, Jonathan D., Sang, Pham Van, Van Hao, Luong & Panha, Somsak 2021
2021
Loc

Bulimus cambojiensis

Pall-Gergely B & Hunyadi A & Auffenberg K 2020: 51
Thach NN 2017: 43
Thach NN 2016: 67
Thach NN 2016: 68
Sutcharit C & Ablett J & Tongkerd P & Naggs F & Panha S 2015: 62
Abbott RT 1989: 160
Richardson L 1985: 10
Laidlaw FF & Solem A 1961: 529
Pilsbry HA 1900: 177
Fulton H 1896: 91
Fischer P 1891: 114
Pfeiffer L 1877: 23
Morelet A 1875: 260
Pfeiffer L 1868: 16
Pfeiffer L 1862: 11
1862