Satsuma lini, Wu & Hwang & Lin, 2008

Wu, Shu-Ping, Hwang, Chung-Chi & Lin, Yao-Sung, 2008, Systematic revision of the arboreal snail Satsuma albida species complex (Mollusca: Camaenidae) with descriptions of 14 new species from Taiwan, Zoological Journal of the Linnean Society 154 (3), pp. 437-493 : 453-456

SATSUMA LINI SP. NOV. ( FIGS 11 , 12 )

Material examined

Type specimen: Holotype: TMMT 0602 (from type locality, dry shell, tissue in alcohol, dissected). Three paratypes: all from type locality, TMMT 0621 (immature, in alcohol); ANSP A21015 (shell with tissue in alcohol); BMNH 20060753 (dry shell).

Type locality

Shanlinxi, Nantou County, central Taiwan ( Fig. 1 , Table 1)

Diagnosis

Shell and soft body white with grey pedal stripe; periphery angulated but not keeled; junction between columellar and inferior lips angulated. Because of a Description

Shell ( Fig. 11 ): Dextral, conical, medium sized. Apex obtuse. Whorls inflated. Periphery bluntly angulated. Base expanded. Pre-apertural constriction behind outer and inferior lips present. Surface smooth, glossy with spiral striae. Shell colour whitish. Periostracum thin. Aperture diagonal, ovate-lunate, angulated between outer lip and inferior lip. Peristome thin, expanded, reflected at curved inferior lip. Superior columellar lip reflected. Umbilicus covered by columellar lip mostly, crevice-like. Columellar lip vertical to subvertical, angulated at junction with inferior lip.

Band or stain: Polymorphism exists in this taxon. The majority of individuals do not possess band or colour stain, and display a whitish coloration. A rare form exists with pink stain and smear from the third to the fourth band position. Band formula = 0 0 0 0 0 0 0 0; 0 0 (0 0) 0 0 0 0 (very rare).

lack of knowledge of its genitalia, distinguishing this species from similar species based on shell characteristics only is difficult.

Etymology

L. lini : the name is dedicated to the late Professor Lin, Fei-Jan (1934–2004), a pioneering evolutionary biologist from Taiwan.

Reproductive system ( Fig. 12 ): No reproductively mature specimens were collected. An immature genitalia is figured to demonstrate its basic configuration.

Distribution

The species was found only in a narrow area of mid-altitude forest (1600–1800 m) near Shanlinxi , Nantou County, central Taiwan ( Fig. 1 , Table 1) .

Remarks

Inhabits typically above 3 m. Adults were found during winter ( Fig. 11G ). Only four specimens are available; two of these have adult shell morphology but genital development is incomplete. The other individuals are sub-adults.

This species is morphologically similar to S. albida , S. swinhoei sp. nov. and S. insignis , but its genetic relationship is closer to S. insignis (see Phylogeny). Compared with S. albida , S. lini has a larger, thinner and more rigid shell, higher spire and more oblique aperture. The species differs from S. swinhoei in having a periphery that is not keeled, smaller shell diameter and higher spire.

Figures

Figure 1. Sampling localities of all taxa in Taiwan. Bold line, Central Range; thin line, administrative boundary.

Figure 11. Satsuma lini sp. nov. A–D, holotype (TMMT 0602, shell height = 17.6 mm). E, F, paratype (TMMT 0621, shell height = 17 mm). G, living specimen. Arrow indicates the pre-apertural constriction.

Figure 12. Reproductive system of Satsuma lini sp. nov. (holotype, TMMT 0602), immature genitalia. Scale bar = 5 mm. See text for abbreviations.