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Description of a New Scabrotrophon (Gastropoda: Muricidae) from Taiwan

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Description of a New Scabrotrophon (Gastropoda: Muricidae) from Taiwan Bulletin ofMalacologyof Malacology,, Taiwan 貝類學報，R 3h %, 28 : 61-6861 -68 61 Description of a new Scabrotrophon (Gastropoda: Muricidae) from Taiwan Roland HouareHouart' & Sun Chih Liang~iang'2 l1.I.Institut nstitut royal des Sciences naturelles de Belgique rue VautierVautier,, 29 1000 Bruxelles 2.No2.No.43-118,.43-118, Zihyou RdRd,, Madou TownshipTownship,, Tainan County 721 Taiwan Summary Scabrotrophon lani n.sp. is described from Pratas IslandIsland,, southwest ofTaiwan.of Taiwan. It is compared with another Taiwanese speciesspecies,, Scabrotrophon chunfuichu n.戶 i Houart & LanLan,, 2001200 1,, with S. regina (Houart,(Houa肘， 1985) from the Philippine Islands and with S. Scitulus (Dall(Dall,, 1891)189 1) from the NortheasternN ortheastern Pacific. Introduction Scabrotrophon was described by McLean (1996: 93) in order to separate a group of species previously classified in Nipponotrophon Kuroda & HabeHabe,, 1971197 1 by Radwin & D'Attilio (1(1976),976), in Trophonopsis by Rice (1(1971),971), Abbott (1 974)974),, Kaicher (1(1979),979), Abbott & Dance (1(1982),982), and Egorov (1 993)993),, and in Boreotrophon and Trophonopsis by Foster (1(198981). 1). Scabrotrophon differs from Nipponotrophon,Ni抄'P onotrophon ， the most resembling taxontaxon,, in its spiral sculpturesculpture,, having two visible spiral cords in the early teleoconch whorls instead of one or two in Nipponotrophon,N伊'ponotrophon ， and in having more extensiveextensive,, squamose spiral and axial sculpture. Differences are also observed in the morphology oftheof the operculum (Houart & LanLan,, 2001).200 1). Currently there are two species of Scabrotrophon known with certainty to occur in the Chi­Chi- na Sea: S. chunfui Houart & LanLan,, 2001 and S. lani n. sp. Other species live in the Northeastern PacificPacific,, in the Bering SeaSea,, the Okhotsk SeaSea,, the Kurile IslandsIslands,, off northern JapanJapan,, in the Philippine IslandsIslands,, and in the northeastern Atlantic. Abbreviations IRSNB: Institut royal des Sciences naturelles de BelgiqueBelgique,, Brussels. alnldln3s 1ei!ds ayljo IC5?01ou!m.m~- 1 3rd 'IC1uo IIays auo u! pahlasqo sem ia13oiay3 aylley) sueam sry~'s~ay3eiq uaamlaq ~ndIC11euo!se330 s! (1 3rd) IC%olou!wialayL 3xfmI3dv p.1~3leuoyd!s ayl uo p.103hmupd ~~'t!qe dW p~3@noyd!s ayl uo p.103hpuoss mpm SUI Description of a new ScabrotrophonScabrotrophon 企fromom Taiwan 63 SYSTEMATICS FAMILY MURICIDAE RafinesqueRafinesque,, 181518 15 Genus Scabrotrophon McLeanMcLean,, 1996 Type species (by original designation) : Trophon maltzani Kobelt and KüsterKuster,, 1878. Northeastem Pacific. OrOriginali!:ünal diagnosisdia Q: nosi~ : Shell small to medium in sizesize,, canal moderately longlong,, open; protoconch paucispiral,paucispiral, of 1.5 roundedrounded,, well-separated whowhorls.r1 s. Sculpture axial and spiral; eaearlyr1 y sculpture dominated by 2 strong spiral cords; spiral cords scab­scab- rousrous,, overriding axial ribs ofmatureof mature sculpture. Scabrotrophon lani n.sp. Figs 11,2,3--7, 2, 3--7 Type material: Holotype IRSNB IG 30323/526;303231526; paratype colcoll.l. Ying Jay LeeLee,, #30 sec.2 Jong shan north rd.rd.,Taipei,Taipei City 100100,Taiwan,Taiwan 0 Type locality (Fig. 2): South China seasea,, near Pratas IslandIsland,, 2026351-2035'-20 50' N -116-1 lg 衍35'-'-116 11 6'55'。衍 'EE,， about 350 m depth Distribution: South China SeaSea,, near Pratas IslandIsland,, living in about 350 m. Dimensions: Holotype 40.05 mm x 19.30 mmmm,, paratype 40.90 x 22.20 mm Description SheShell1l 1argelarge sized for the genusgenus,, up to 40.9 mm in length at maturitymaturity,, angulateangulate,, weakly spinosespinose,, lighlightlyt1 y built. Spire high with 11.45.45 protoconch whowhorlsr1 s and up to 5 broadbroad,, convexconvex,, weakly angulateangulate,, shoulderedshouldered,, teleoconch whowhorls.r1 s. Suture impres­impres- sedsed,, partially obscured by small axiallamellaeaxial lamellae of following whorwhorl.l. Protoconch ( Figs 6-7) largelarge,, broad,broad, bulbous,bulbous, whowhorlsr1 s rounded; terminal varix unknown (eroded). Axial sculpture of first to penultimate teleoconch whowhorlr1 consisting ooff1 low,ow, narrownarrow,, 64 Roland Houart & Sun Chih Liang frillyfrilly,, irregularly placed,placed, numerous lamellae. First whorl partially erodederoded,, second with 17 or 18 lamellaelamellae,, third with 18-2318-23,, fourth with 20 or 212 1,, last whorl with 9-129- 12 lamellate varices. Spiral sculpture ofhighof high,, strongstrong,, narrownarrow,, primary and secondary cordscords,, ending as shortshort,, broadly open spinelets on axiallamellae.axial lamellae. Visible part of first teleoconch whorl with 凹，IP, P1,Pl ， P2P2,, second whorl with adisadis,, IPIP,, PlP1 and P2P2,, third with adisadis,, IPIP,, P 11,, ssl, 1, P2P2,, fourth with adisadis,，凹， IP, PlP1,， sls 1,， P2,P2 ，泣， s2, last with adis,ad 泊， IP,IP， PlPI,, slsl,, P2P2,，泣， s2, P3P3,， (s3)(s3),, P4P4,, P5P5,, (s5)(s5),, P6,P6 ，的， s6, ADPADP,, adsads,, MPMP,, msms,ABP., ABP. ssl, 1 ，泣， s2, s3 decre­decre- asing in strength abapically and abaperturally. Spinelets more strongly developed on last teleoconch whorl; shoulder spinelet strongest and longeslongest.t. Aperture largelarge,, broadly ovate. Columellar lip broad,broad, smoothsmooth,, rim partially erecterect,, adherent at adapical extremity. Anal notch shallowshallow,, broad. Outer lip weakly erecterect,, smoothsmooth,, with 6 very weakweak,, broad denticles within (I(ID,D, DDl 1 - D5). Siphonal canallongcanal long,, about 41-45% oftotalof total shelllengthshell length,, narrownarrow,, weakly abaxially bent,bent, 0-o- pen. Operculum light brown,brown, ovateovate,, with terminal nucleus. Shell white. Etymology: Named after our friend T.C. Lan (1(193931-2004) 1-2004) who found the holotype ofthisof this species and who devoted most ofhisof his life to malacology. Remarks Scabrotrophon lani n.sp. differs from S. regina from the Philippines in hav­hav- ing a last whorl more constricted at its base,base, a longerlonger,, smoother and comparitively smaller siphonal canalcanal,, an erect columellar lip (adherent in S. regina)regina),, more nu­nu- merous and more frilled axiallamellaeaxial lamellae,, and broader,broader, less numerousnumerous,, spiral cords: in S. regina IP is broad and only present from second teleoconch whorl; adis is present from third or fourth whorlwhorl,, it is very weak,weak, only discernable by the pres-pres­ ence ofaof a short open spine on the axiallamellae.axial lamellae. From S. chunfui,chunfi帥， S. lani differs in having a more shouldered shellshell,, in being more squamose with more numerous axiallamellaeaxial lamellae,, and in having a broader,broader, largerlarger,, and bulbous protoconch. It also has a different morphology oftheof the spiral cords: S. chunfui has low primary and secondary cords of almost the same strength in penultimate and last teleoconch whorlswhorls,, while they are high in S. lani and the secondary cords being almost 4 times narrower than the primary cords. b 悔， Description of a new ScScabrotrophonabrotrophon from Taiwan 65 快 S. lani differs from S. scitulus in many ways but especiaespeciallyl1y in axial and spiral -.. sculpture. There are no spiral cords on the shoulder in S. scitulus,scitulus, and only very -... few secondary spiral cords: s3 is very smallsmall,, and not always present,present, while s4 is 快 very lowlow,, almost obsoleteobsolete. b 』區 FVE Acknowledgements 且 •••• We are most indebted to Mr. Ding Fa ShiShi,, for his only specimen (holotype) EE--' for this studystudy,, and to MMr.Yingr. Ying Jay Lee for the loan oftheof the paratype. , h References AbbottAbbott,, R.R.T. T. 1974. American SeashellsSeashells,, 2nd. Ed. Van Nostrand ReinholdReinhold,, N.Y.:N.Y.: 1-663. AbbottAbbott,, R.T. & DanceDance,, S.P. 1982. Compendium ofSeashells.of Seashells. E.P. DuttonDutton,, N.Y.:N. Y.: i-xi-x,, 1-411-411.1. EgorovEgorov,, R.R.V.V. 1993. Trophoninae (Muricidae)( Muricidae ) ofRussianof Russian and adjacent waters. Ruthenica SuppSuppl.1. 1: 1-48. FosterFoster,, N.R.N .R. 1981.198 1. A synopsis oftheof the marine prosobranch gastropod and bivalve momollusksl1usks in Alaskan waters. Institute ofMarineof Marine ScienceScience,, University of AlaskaAlaska,, Fairbanks: i-xxi-xx,, 1-479. HouartHouart,, R. & LanLan,, T.C. 2001. Description of Scabrotrophon chunfuichu n，戶 i n.sp. (Gast­(Gast- ropoda:ropoda : Muricidae) from Northeast Taiwan and comments onNipponotro­on Nipponotro- phon Kuroda & HabeHabe,, 1971197 1 and Scabrotrophon McLeanMcLean,, 1996. Novapex 2 (2): 37-42. KaicherKaicher,, S.D. 1979. Card catalogue ofwoof world-wider1 d-wide sheshells,l1 s, Muricidae IIV.V. Privatly publ.pub1. SSt.t. PetersburgPetersburg,, Florida. McLeanMcLean,, J.H. 1996. Taxonomic Atlas oftheof the benthic fauna oftheof the Santa Maria Ba­Ba- sin and Western Santa Barbara ChanneChannel.l. VoVol.l. 9 - The Mollusca Part 2 - The Gastropoda - The Prosobranchia. Santa Barbara Museum ofNaturalof Natural History: 1-160. RadwinRadwin,, G. & D'AttilioD'Attilio,, A. 1976. Murex shells oftheof the woworld.r1 d. An illustrated guide to the Muricidae. Stanford University PressPress,, Stanford: 1-284. RiceRice,, T., 1971.197 1. Marine shells oftheof the Pacific Northwest.Northwest. EEllisonl1 ison IndustriesIndustries,, Inc.Inc.,, EdmondsEdmonds,, Washington: 1-101- 10 66 Roland Houart & Sun Chih Liang ' J •, • ••- • e 室， 13 Pracel-.. Islands- Fig. 2. Distribution map Description of a new Scabrotrophon from Taiwan Figures 3- 11 3-7. Scabrotrophon lani n.sp. 3 - 4. holotype IRSNB 30323/526,40.05 mm x 19.30 mm 5.
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