A new species of the genus Isometrus Ehrenberg 1828 from China (Scorpiones, Buthidae)

2008·0.57 MB·

Acta Zootaxonomica Sinica, 33 (2) : 264- 271 ( Apr., 2008) ISSN1000(cid:1)0739
动物分类学报
A NEW SPECIES OF THE GENUS ISOMETRUS EHRENBERG 1828 FROM
CHINA (SCORPIONES, BUTHIDAE)
WILSONR Louren(cid:1)o1, ZHUMing(cid:1)Sheng2
1. D(cid:1)partement deSyst(cid:1)matique etEvolution, USM 0602, SectionArthropodes (Arachnologie), Mus(cid:1)umnationald(cid:1)Histoirenaturelle, CP 053, 61rueBuffon(cid:2) 75005Paris,
France; E(cid:1)mail: [email protected]
2. Collegeof LifeSciences, HebeiUniversity, Baoding(cid:2) 071002, China
Abstract(cid:2) A new species, Isometrus (Reddyanus) tibetanus sp. nov. from Tibet, China is described. For comparative purposes,
Isometrus (Reddyanus) assamensis Oates, 1888, originallydescribedfromIndia, andalsodistributedin Nepal, isredescribed based on
the original typematerials(holotypes) anda series of specimens deposited inthe Mus(cid:1)umNationald(cid:1)Histoire Naturelle, Paris.
Key words(cid:2) Scorpion, Buthidae, Isometrus, newspecies, Tibet.
1(cid:2) Introduction Our own examination of the original type material of I.
( R.) assamensis, deposited in the Natural History
The genus Isometrus was erected by Ehrenberg ( in
Museum, London, revealed that at least some of the
Hemprich & Ehrenberg, 1828) with Buthus ( Isometrus)
specimens in this series were poorly preserved and most
filum Ehrenberg, 1828 [ = Isometrus maculatus ( DeGeer,
certainly pre(cid:1)adults. Moreover, the study of several
1778)] as monotypic species. Vachon ( 1972) proposed
specimens from Nepal, deposited in the Mus(cid:1)um
the division of the genus Isometrus into two subgenera:
National d(cid:1)Histoire Naturelle, Paris, clearly suggested
Isometrus Ehrenberg and Reddyanus Vachon. The
thatsexual dimorphism is poorlypronounced in juveniles
diagnosis for the two subgenera were indicated only in a
or pre(cid:1)adults of this species. Since I. ( R.) assamensis
short key and based on the relative position of certain
remains poorly characterized, we decided to redescribe
trichobothria. In subgenus Isometrus, trichobothrium db
this species in thepresentpaper. Anewspecies, Isometrus
of the fixed finger in a distal position in relation to the
(R.) tibetanus sp. nov., related to I. ( R. ) assamensis
trichobothria et and est; the distance between external
was also described from Tibet, China. With the new
trichobothria of thefemur e and e beingmore than two
1 2
discovery, the number of Isometrus species present in
tofivetimes of the distance between trichobothria e and
1 China is raised to three: Isometrus ( Isometrus) maculatus
d . In contrast, in subgenus Reddyanus, trichobothrium
3 ( DeGeer, 1778), Isometrus ( Reddyanus ) hainanensis
db in a basal position to et, situated between et and est;
Louren(cid:1)o, Qi & Zhu, 2005 and Isometrus ( Reddyanus)
the distance between external trichobothria of the femur,
tibetanus sp. nov.
e1 and e2 always less than two times of the distance
2(cid:2) Methods and Material
between e1 andd3.
Vachon (1972) placed three species in the subgenus Illustrations and measurements wereproduceusinga
Isometrus andfivein the subgenusReddyanus, whereasfive Wild M5 stereo(cid:1)microscope with a drawing tube and an
others remained unclear classification. In the catalog of ocular micrometer. Measurements followStahnke (1970)
thescorpions ofthe world, Fet&Lowe(2000) placed six and are given in micrometer ( mm) . Trichobothrial
species in the subgenus Isometrus and all the others ( 16) notations follow Vachon ( 1974) and morphological
in the subgenus Reddyanus. In the revision of the genus, terminology mostly follows Vachon ( 1952) and Hjelle
Kova r(cid:2)k ( 2003) placed four species in the subgenus (1990).
Isometrus and all the others ( 21) in the subgenus Sub(cid:1)cuticular pigmentation maybevery stablewithin
Reddyanus. buthid species populations (Louren(cid:1)o, 1983; Louren(cid:1)o &
In the revision of the genus Isometrus, Kova r(cid:2)k Cloudsley(cid:1)Thompson, 1996), and therefore useful as a
(2003) described four new species, whereas the already taxonomic character in the definition of species. The
known species werelimited tocitations, followed by lists material used for the redescription of I. (R.) assamensis
of the studied material. This was the case for Isometrus wasfound in the collections of the Mus(cid:1)um National d(cid:1)
(Reddyanus) assamensis Oates, 1888. For this species, Historie Naturelle, Paris. It is quite well preserved. The
Kova rik ( 2003) examined the original types and new species is based on one specimen entrusted to the
designated one male lectotype and five paralectotypes. senior author some years ago. It is now deposited in
This workwassupportedbygrantsfromtheNational NaturalScienceFoundation of China (30670254) andthe Doctor ProgramFoundationof Chinese
MinistryofEducation, China(20050075002) toZHUMing(cid:1)Sheng.
Received22 Jan. 2008, accepted18Feb. 2008.
264
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MHBU. All the described specimens in thepresent paper 1967 ( M. Hubert) , 2 male(cid:1)juveniles ( MNHN(cid:1)RS(cid:1)
areadultand deposited in alcohol ( Depositores: BMNH 7707); Dhara Pani, 10 Apr. 1970 ( M. Hubert), 1
= The Natural History Museum, London; MNHN= male(cid:1)juvenile, 1 female ( MNHN(cid:1)RS(cid:1)5412 );
Mus(cid:1)um National d(cid:1)Histoire Naturelle, Paris; MHBU= Narayengath, 150(cid:1)250m, 19 Dec. 1966 (M. Hubert),
Museum, Hebei University, Baoding, China). 1male, 2females (MNHN(cid:1)RS(cid:1)7705), 1male, 1female
( MHBU) ; 21 Dec. 1966 ( M. Hubert), 1 male
3(cid:2) Taxonomic Treatment
( MNHN(cid:1)RS(cid:1)7702); 22 Dec. 1966 ( M. Hubert) , 1
Buthidae C. L. Koch, 1837 male ( MNHN(cid:1)RS(cid:1)7703) , 1 male ( MNHN(cid:1)RS(cid:1)7704);
25 Dec. 1966 ( M. Hubert), 2 males, 3 females
Isometrus Ehrenberg, 1828
(MNHN(cid:1)RS(cid:1)8224) ; Palture ( W(cid:1)km 72) , 1450m, 28
Isometrus ( Reddyanus ) assamensis Oates, 1888 May1973 ( M. Hubert), 2 males ( MNHN(cid:1)RS(cid:1)6618);
(Figs(cid:2)1(cid:1)13, 27(cid:1)31, 33) Pathiva, 28 Dec. 1966(M. Hubert), 1male(cid:1)juvenile, 1
Isometrus assamensis Oates, 1888: 250; Kraepelin, 1896: 126; Kraepelin,
female ( MNHN(cid:1)RS(cid:1)7706); Sangara, 170m, 30 Dec.
1899: 67; Pocock, 1900: 48; Kraepelin, 1913: 135; Takashima, 1945:
1966 ( M. Hubert), 1 male(cid:1)juvenile ( MNHN(cid:1)RS(cid:1)
86.
Isometrus (Reddyanus) assamensis: Vachon, 1972: 177; Tikader&Bastawade, 7700); Satinagarh, 250m, 31Dec. 1966(M. Hubert),
1983: 292; Fet&Lowe, 2000: 151; Kova rik, 2003: 5. 1male (MNHN(cid:1)RS(cid:1)7701).
Diagnosis. Scorpion ofmoderatetosmall size, with
Material. India, Assam, Dhubri, 1 male, 5
respectto the genus, females ranging from 28 to32 mm
females, type series(cid:1)BMNH(cid:1)1889. 7. 31. 76(cid:1)77, E.
and males from 36 to 40 mm in total length. General
W. Oates ( C et P). Material poorly preserved (1 male
coloration yellowto reddish(cid:1)yellow with intense brownish
lectotype and paralectotypes designated by Kova rik
variegated pigmentation over the body and appendix.
(2003)). Nepal, Butwal(cid:1)Tansen, 350(cid:1)400 m, 1 Jan.
Fig(cid:2)1. Habitusof Isometrus (Reddyanus) assamensis. MalefromNepal.
(cid:2) 2(cid:2)66(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) ActaZootaxonomica Sinica 动物分类学报(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) Vol. 33(cid:2) No. 2
Figs(cid:2)2(cid:1)13. Isometrus (Reddyanus) assamensis. MalefromNepal. 2(cid:1)6. Trichobothrialpattern. 2(cid:1)3. Chela dorso(cid:1)
external and ventral aspects. 4(cid:1)5. Patella, dorsal and external aspects. 6. Femur, dorsal aspect. 7(cid:1)8.
Metasomal segment V and telson, lateral and ventral aspects. 9. Lateral eyes, dorsal aspect. 10(cid:1)11.
Chelicera, dorsalandventral aspects. 12. Sternum, genital operculum and pectines. 13. Dentate margin of
movablefinger, showingrowsof granules.
Carinae and granulations moderate to weak. Pectines and appendix. Prosoma: carapace reddish(cid:1)yellow with
small; pectinal tooth count13 to 16for males and 13 to several brownish spots or pigmented zones all over its
15 for females. Dentate margins of fixed and movable surface; eyes surrounded by black pigment. Mesosoma:
fingers ofpedipalp chela with 7 nearly almostlinear rows tergites yellowish with 3 longitudinal brownish stripes,
of granules. Subaculear tubercle strong and rhomboid in and dark confluentzones on the posterior edge of tergites
male, between rhomboid and spinoid in female. !(cid:1)∀ . Metasoma: segments ! to # yellowish,
Coloration. Generallyyellow toreddish(cid:1)yellowwith segment ∃ reddish(cid:1)yellow, segment % dark reddish;
intense brownish variegated pigmentation over the body presence of dark spots on theventral surface and carinae,
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well marked on segments ∃(cid:1)%. Vesicle dark reddish; median carina; obsolete on !, weaktomoderate on &(cid:1)
aculeus reddish, slightly paler than vesicle. Venter ∀. Tergite ∋ pentacarinate, with lateral pairs ofcarinae
yellowish. Chelicerae yellowish with pale brownish moderate to strong; median carinae present in proximal
variegated spots on its anterior half; teeth reddish. half, moderately developed. Intercarinal spaces with a
Pedipalps: yellowish with brownish variegated spots over thin granulation. Sternites smooth, with moderately long
all faces, excepted ventrally; chela fingers much darker spiracles; sternite ∋ with four cariane, well marked in
than chela hands; rows of granules on dentate margins of female. Pectines moderately long; pectinal teeth count 13
the fingers dark reddish. Legs yellowish with variegated to16 in males, 13 to15infemales. Metasoma: segment
brownish spots. ! with 10 carinae, crenulate; &(cid:1)∃ with 8 carinae,
Morphology. Prosoma. Anterior margin of carapace crenulate. Segment V with five carinae; one posterior
moderately to strongly emarginate. Carapace carinae spinoid granule on the dorsal carinae of segments !(cid:1)∃.
almost obsolete, with only the anterior median carinae Dorsal furrows of all segments obsolete, with minute
weakly developed. Intercarinal spaces with a thin granulations; intercarinal spaces with thin intense
moderately intense granulation. Median ocular tubercle granulations. Telson almost smooth with one ventral
anterior to the centre of the carapace; median eyes carina; subaculear tubercle strong and rhomboid in
separated by approximately one ocular diameter. Three males, more to spinoid in females with two granules on
pairs of lateral eyes. Mesosoma: tergites !(cid:1)∀ with a the ventral surface. Chelicerae with the dentition
(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2)
Fig(cid:2)14. Habitus ofIsometrus (Reddyanus) tibetanus sp. nov., male holotype.
(cid:2) 2(cid:2)68(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) ActaZootaxonomica Sinica 动物分类学报(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) Vol. 33(cid:2) No. 2
characteristic of the buthids (Vachon, 1963); two small of femur in (cid:1) ( beta) configuration ( Vachon, 1975).
basal teeth on movable finger. Pedipalps: femur Legs: ventral aspect of tarsi with a brush(cid:1)like group of
pentacarinate; all carinae moderately crenulate. Patella setae. Tibial spurs absent; pedal spurs present and
with 7 carinae, moderately crenulate; dorsointernal moderately developed on legs #(cid:1)∃.
carinae with 4(cid:1)5 spinoid granules. Chela with vestigial
Isometrus (Reddyanus) tibetanus sp. nov. ( Figs(cid:2)14(cid:1)
carinae. Intercarinal spaces weakly granular. Dentate
26, 32, 33)
margins on movable andfixed fingers composed of seven
linear rows of granules. Trichobothrial pattern type A, Type material. 1 male holotype. China, Tibet,
orthobothriotaxic ( Vachon, 1974); dorsal trichobothria Region of Chesu, Oct. 1970 ( Lindberg leg). Now
Figs(cid:2)15(cid:1)26. Isometrus (Reddyanus) tibetanus sp. nov. Male holotype. 15(cid:1)19. Trichobothrial pattern. 15(cid:1)16. Chela dorso(cid:1)
externaland ventral aspects. 17(cid:1)18. Patella, dorsal and external aspects. 19. Femur, dorsal aspect. 20(cid:1)21. Metasomal
segment % and telson, lateral and ventral aspects. 22. Lateral eyes, dorsal aspect. 23(cid:1)24. Chelicera, dorsal and ventral
aspects. 25. Sternum, genitaloperculumandpectines. 26. Dentate margin of movablefinger, showingrowsof granules.
Apr., 2008 Wilson R. LOUREN(cid:2)O 等: 中国等蝎属一新种 (蝎目, 钳蝎科) 269 (cid:2)
Figs(cid:2)27(cid:1)31. Isometrus (Reddyanus) assamensis, male andfemalefromNepal. 32. Isometrus (Reddyanus) tibetanus
sp. nov., male holotype. 27, 28, 32. Carapace and tergites !(cid:1)&, dorsal aspect, showing characteristic
patternsof pigmentation. 29. Metasomal segment % and telson, lateral aspects. 30, 31. Chelicera, dorsal
andventral aspects.
Fig(cid:2)33. Map of China, Tibetand Nepal, showingthe type locality of the new species(blackstar) and the
localitiesof collection of I. (R.) assamensis (blackdots).
deposited inMHBU. Tibet, typelocality of thenew species.
Etymology. The specific name makes reference to Diagnosis. Scorpions of small to moderate to small
(cid:2) 2(cid:2)70(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) ActaZootaxonomica Sinica 动物分类学报(cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) (cid:2) Vol. 33(cid:2) No. 2
size, with respect to the genus, measuring from 38 mm granular. Telson smooth with one ventral carina;
( male). General coloration pale yellow to slightly subaculear tubercle strong and rhomboid, with two
reddish(cid:1)yellow throughout body and appendages. granules on the ventral surface. Chelicerae with the
Carinae and granulations weak. Pectines small; pectinal dentition characteristic of the buthids ( Vachon, 1963);
tooth count16(cid:1)16for the male. Dentatemargins of fixed two small basal teeth on movable finger. Pedipalps:
and movablefingers ofpedipalpchelawith7almostlinear femur pentacarinate; all carinae moderately crenulate.
rows of granules. Telson elongated in male; subaculear Patella with seven carinae, moderately crenulate;
tubercle strongandrhomboid, with twoventralgranules. dorsointernal carinae with 5(cid:1)6 spinoid granules. Chela
From its general morphology, Isometrus ( Reddyanus ) with vestigial to obsolete carinae weakly crenulate.
tibetanus sp. nov. appears to be most closely related to Intercarinal spaces weakly granular to almost smooth.
Isometrus ( Reddyanus) assamensis Oates, 1888, originally Dentate margins on movable and fixed fingers composed
described from Dhubri in India, and also distributed in of seven linear rows of granules. Trichobothrial pattern
Nepal. It can be distinguished from the latter by the type A, orthobothriotaxic ( Vachon, 1974); dorsal
following characters: 1) a much paler coloration, pale trichobothria of femur in (beta) configuration ( Vachon,
yellow to slightly reddish(cid:1)yellow, with unconspicuous 1975). Legs: ventral aspect of tarsi with a brush(cid:1)like
spots. In contrast I. ( R. ) assamensis is yellowish but group of setae. Tibial spurs absent; pedal spurs present
with brown spots over the body and appendix, and a and moderately developed on legs #(cid:1)∃.
dominant blackish coloration over the carapace and Distribution. China ( Tibet) .
tergites; 2) metasomal segments carinae and posterior
Table 1. Morphometric values (inmm) of male andfemale of
spinoidgranules on dorsal carinae are weaker in the new Isometrus (Reddyanus) assamensis from Nepal andfor the male
species; 3) granulations on carapace and tergites are holotype of Isometrus (Reddyanus) tibetanus sp. nov.
thinner or obsolete on the new species. Isometrus (R.)
Isometrus (R.) assamensis
Coloration. Generally pale yellow to reddish(cid:1) tibetanus sp. nov.
yellow. Prosoma: carapace yellowish with some vestigial Male Female Male(holotype)
spots or pigmented zones on the lateral and posterior Total length 39(cid:2)8* 31(cid:2)9* 38(cid:2)3*
margins; eyes surroundedby blackpigment. Mesosoma: Carapace:
(cid:1)Length 4(cid:2)1 3(cid:2)9 4(cid:2)0
tergites yellowish with vestigial spots on I. Metasoma:
(cid:1)Anteriorwidth 2(cid:2)3 2(cid:2)3 2(cid:2)4
segments ! to ∃yellowish; segment %reddish(cid:1)yellow.
(cid:1)Posteriorwidth 3(cid:2)7 3(cid:2)8 3(cid:2)6
Vesiclereddish(cid:1)yellow; aculeusreddish(cid:1)yellowatthe base
Metasomal segment !:
and reddish at its extremity. Venter pale yellow.
(cid:1)Length 3(cid:2)3 2(cid:2)3 3(cid:2)2
Chelicerae yellowish with vestigial pale brownish
(cid:1)Width 1(cid:2)6 1(cid:2)7 1(cid:2)5
variegated spots just behind fingers; teeth reddish.
Metasomal segment %:
Pedipalps: yellowish throughout, excepted for some
(cid:1)Length 6(cid:2)5 4(cid:2)7 6(cid:2)1
vestigial pale brownish spots on femur; rows of granules
(cid:1)Width 1(cid:2)3 1(cid:2)3 1(cid:2)2
on dentatemargins ofthefingers pale reddish. Legs pale (cid:1)depth 1(cid:2)5 1(cid:2)4 1(cid:2)3
yellowwith only obsolete spots. Vesicle:
Morphology. Prosoma: anterior margin of carapace (cid:1)Width 1(cid:2)2 0(cid:2)9 1(cid:2)0
moderately emarginate. Carapace carinae almost (cid:1)Depth 1(cid:2)3 1(cid:2)1 1(cid:2)2
obsolete, with only the anterior median carinae weakly Pedipalp:
developed. Intercarinal spaces with a thin or obsolete (cid:1)Femur length 3(cid:2)8 3(cid:2)3 3(cid:2)7
granulation. Median ocular tubercle anterior tothe centre (cid:1)Femur width 1(cid:2)2 1(cid:2)2 1(cid:2)1
of the carapace; median eyes separated by one ocular (cid:1)Patellalength 4(cid:2)5 3(cid:2)9 4(cid:2)3
diameter. Threepairs oflateral eyes. Mesosoma: tergites (cid:1)Patellawidth 1(cid:2)5 1(cid:2)3 1(cid:2)3
(cid:1)Chelalength 6(cid:2)5 5(cid:2)5 6(cid:2)1
!(cid:1)∀ with a median carina, weak to moderate. Tergite
(cid:1)Chelawidth 1(cid:2)3 1(cid:2)0 1(cid:2)1
∋ pentacarinate, with lateral pairs of carinaemoderateto
(cid:1)Cheladepth 1(cid:2)1 0(cid:2)9 1(cid:2)0
strong; median carinae present in proximal half,
Movablefinger:
moderately developed. Intercarinal spaces with a thin or
(cid:1)Length 4(cid:2)0 3(cid:2)7 3(cid:2)6
obsolete granulation. Sternites smooth, with rather short
(cid:2) (cid:2) * For the total length, we don(cid:1)t takein considerationthe telson(cid:1)s
spiracles; sternite ∋ with four carinae. Pectines length. Ifthisvalueisadded, thetotallengthwouldberespectively44(cid:2)6and
moderately long; pectinal teeth count16(cid:1)16. Metasoma: 35(cid:2)4mmfor I. (R.) assamensis and42(cid:2)7for I. (R.) tibetanus sp. nov.
Segment ! with10carinae, moderatelycrenulate; &(cid:1)∃ Acknowledgements (cid:2) Weareverygratefulto Dr. Victor
with 8 carinae, moderately crenulate. Segment % with Fet, Marshall University for reviewing the manuscript.
five carinae; one posterior spinoid granule on the dorsal
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中国等蝎属一新种 (蝎目, 钳蝎科)
WilsonR. LOUREN(cid:2)O1(cid:2) 朱明生2
1. D(cid:1)partementdeSyst(cid:1)matiqueet Evolution, USM0602, SectionArthropodes(Arachnologie), Mus(cid:1)umNationald(cid:1)HistoireNaturelle, CP053, 61rueBuffon
75005Paris, France: e(cid:1)mail: [email protected]
2. 河北大学生命科学学院(cid:2) 保定(cid:2) 071002
摘(cid:2) 要(cid:2) 描述了采于中国西藏等蝎属1新种))) 西藏等蝎, 体长42(cid:2)70mm。根据一般形态, 新种近似于原始描述产
Isometrus (Reddyanus) tibetanus sp. nov.。为了比较, 根据原始模 于印度和尚分布于尼泊尔的阿萨姆等蝎 Isometrus (Reddyanus)
式标本和保存在法国自然博物馆的系列标本, 重新描述了原 assamensis Oates, 1888 (图14~ 26, 32, 33), 但如下特征不同
始描述于印度和尚分布于尼泊尔的阿萨姆等蝎 Isometrus 于后者: 1) 身体颜色更浅, 呈浅黄色到浅红黄色, 具不明显
(Reddyanus) assamensis Oates, 1888。 或荒废的斑点, 而阿萨姆等蝎I. (R.) assamensis 相反, 其身
体和附肢具褐色斑点, 且背甲和中体背板主要为浅褐色, 2)
西藏等蝎, 新种Isometrus (Reddyanus) tibetanus sp. nov. (图
后体节的脊和背脊的后顶颗粒较弱, 3) 背甲和中体背板的
1~ 13, 27~ 31, 33)
颗粒稀少或荒废。
正模 ∗ , 中国西藏车苏 (Chesu), 1970年 9月, Lingberg
词源: 新种的种名以模式标本的产地而拟定。
采 (现保存在河北大学博物馆)。
关键词(cid:2) 蝎, 钳蝎科, 等蝎属, 新种, 西藏.
中图分类号(cid:2) Q959(cid:2)226(cid:2)4