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(Insecta: Dermaptera) with a Check-List of Genera and Species

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(Insecta: Dermaptera) with a Check-List of Genera and Species Rec. zool. Surv. India: 97 (Part-I) : 73-100, 1999 ON THE HIGHER CLASSIFICATION OF ANISOLABIDIDAE (INSECTA: DERMAPTERA) WITH A CHECK·LIST OF GENERA AND SPECIES G. K. SRIVASTAVA* Eastern Regional Station, Zoological Survey of Illdia, ShilJollg INTRODUCTION ~akai (1982) pointed out that family name Anisolabi( di)dae Verhoeff, 1902 has priority 6Verl~arcinophoridae Popham, 1965. Similarly the sub family Anisohibi(di)nae Zacher, 1911 baspriority overCarcinophorinae Hincks, 1954. Accordingly the former are used in the present work. A key for the discrimination of various subfamilies is given. The distinctive characters are based on various morphological character, mainly, on the body shape, shape of thoracic tergites, sternites and the male genitalia. It is proposed to erect a new subfamily Placolabidinae for the reception of Plac.:olabis Bey­ Bienko, 1959 as its type genus. This genus is very distinct from all t.he known genera of Anisolabidinae in having the median posterior prolongation of 8th sternite in males. Is·olaboidinae has been placed under this family by Srivastava (1996) which was transferred under Spongiphoridae (=Labidae) by Steinmann (1990). An attempt is made here to streamline the taxonomic status of various g~nera of AnisQlabidinae by providing akeyfortheirseparation. The main criteria fortheirdiscrilninatioll is based on the relative length of parameres besides its overall shape. The definition of various genera hOas been enlarged. The genera based on the shape of distal iobes and its associated stnlctures such as chiti nons accessory plates, shape and size of virga and the arrangement of teeth on chitinous pad may not prove t~ be stable characters since these vary intraspecifically. Burr's (1915) arrangement of various genera based upon on the male genitalia which provided a useful basis for their separation, needs modification in the light of present knowledge. Epilandex Hebard, was mainly characterised in having long parameres, a little over ten :times longer than its width and somewhat broader at base, narrowing apically with. tip thread 'like, often turned externally. The parameres in Capralubis Brindle, are well over ten tilnes longer than board. Accordingly, it is· treated as synonum ofEpilandex Hebard. * Present Address: Zoological Survey of India. M-Block, New Alipore. Calculta-7QO 051 74 RECORDS OF THE ZOOLOGICAL SURVEY OF INDIA Heterolabis Borelli and Euborellia Burr possess identical parameres. For this reason fonner is treated as synonym. Mon!!olabis Zacher, is redefined to include those species which posses's parameres '"'- roughly one and half times longer than broad, rectangular in shape, sOlnetimes with inner Inargin oblique. Besides, in most cases, the external apical angle is. projecting and tip is pointed or anteriorly produced to form a s9rt of snout. Genera included as synonym· are GelotolabisZacher, Cerolabis Bey - Bienko andParaflexiolabis Steinmann, since the species included under them fit well within the said definition of Mangolabis. The parameres in A nisola bella Zacher, are broadly oval, narrowing apically with external Inargin regularly convex and basal margin feebly obliquely convex and inner margin sigmoid. Somehow, it was kept isolated because of very characteristic shape of parameres. But it does not hold good in view of the shape of parameres inParalabi.~ Burr andHorridolabis Zacher .. In these genera parameres my not be equally broad but are· narrowed apically with external margin regularly convex. Accordingly these two genera are treated as synonym under Anisolabella. Burr placed too ITIuch emphasis on the greatest width of hind abdomin~ tergites while recognising his genus Gonolabis. Steinmann (1981) although rightly questioned the validity of this caracter, treated Gonolabis in much broader sense to include several species ignoring the totally diverse parameres. Besides, his reliance, on the extent of clevage of pro-parameres appears doubtful.lt has been observed to vary intraspecifically .if a series of genitalic mounts are examined. The shape of parameres in Gonolabis. and Epilabis Burr are identical in being of uniform width throughout with external apical angle convex. In the former these are comparatively broader, i.e. about twice as long as broad whereas in latter slightly narrower in being two and half itmes long~r than broad. As a result Epilabis is proposed to be synonymised under Gonolabis. Steinmann (1981 a) erected Foramenolabis wjth Epilabis siseril (Burr) as. the type, characterising mainly by the presence of a deep oval concavity on the head of males. It has' been observed in a large series of the sajd species to be variable in dep.th and occasionly almost obliterated. As such this genus is also treated as synonym of Gonolabis. In the category of .genera having the parameres three times longer than broad with tip produced into a point ot: acuminate, Apolabis Burr, 1915 is treated as valid. EulabisZacher, 1911 (nalTIe prooccupied by Eschscholtz, 1929 in Coleoptera andZilcheria Steinmann, 1975 as its new name) are considered as synonyms. ThekalabisKapoor, has parameres three times longer than broad with apex although not ending into a sharp point,. it is strongly narrowed in apical half. This genus bas been rightly placedassynonymofApoltlbisbySrivastava( 1986). Carcinophora Scudder and Anisolabis Fieber, both possess paralneres more than five ti Ines longer than broad but in the former sides are convex with tip pointed whereas obtu'se in the latter. SRIVASTA VA : On the higher classification of Anisolabididae (Insecta: Dcrmaptcra) 75 Under Carcinophora, genera Spandex Scudder, Notolabis Hincks, Metnlabis Burr, MClndex Burr, Psalis Serville and Neolabis Brindle are treated as synonYlTI. Steinmann (1989) has wrongly placed Homoeohlbis Borelli, 191 1 as synonYITI under Anisolabis. In fact it is synonym of Titanolabis Burr, 191 1 under Titagolabidinae. Indolabis Steinmann, appears to be close to Titanolabis on the basis of male genitalia. Since the shape of thoracic sternites is not described in detail, only mentioned as 'Typical' in the original description, it is not possible to comment further. For this reason it is treated as valid pending examination of the type. Similarly; Flexiolabis Steinmann is also treated as valid which is not sufficiently characterised. Perhaps when specimens the two species, included under the genus, are available for examination, it would be possible to evaluate the characters. Key to the subfamilies (on males only) I (2) Body strongly flattened, i.e. dorsoventrally compressed ....................... Platylabiinae 2 (I) Body not strongly flattened, head and abdominal terg~tes often convex or weakly convex or flattened 3 (4) Prostemum gradually attenuate posteriorly .......................................... Gonolabiinae '4 (3) Prosternum with slight construction in posterior one third, afterwards gent!) widened with hind margin truncate 5 (6) Metasternum with hind margin convex, more or less tongue shaped ........................ ............................................................................................... ........ .... ...... .. Titanolabidinae 6 (5) Metasternum with hind mar.gin tluncate, generally widened in basal half and narrowed between hind coxae 7( 12) Mesosternum with hind margin convex 8 (9) Eyes absent, parameres vestigial or reduced .......................... Anophthalmolabidinae· 9 (8) Eyes and parameres well developed I O( II) Eighth sternitein middle with a median elongated lobe, directed posteriorly .......... .... ....... .... ...... ..... ........ ...... ....... ..................................... .Placolabidinae Subfam.nov. I I (10) Eighth stemite without such lobe ....................................................... Anisolabidinae 12 (7) Mesosternum with hind margin truncate 13( 16) First antennal segment longer than the distance between antennal bases 14( 15) Mesonotum laterally with a sharp ridge or convexity along its whole length, often dying out in posterior half........................................................ Br~chylabidinae 15( 14) Mesonotum laterally without a ridge or convexity ..................•............ .Isolabidinae 76 RECORDS OF THE ZOOLOGICAL SURVEY OF INDIA 16( 13) First antennal segment shorter or about as long as the distance between antenna} bases I 7 ( J,8) ,Proparameres united all along its length ............................................ Antisolabidinae I 8( 17) Proparameres of both side separated, or partially separated apically 19(22) Distal lobes of both sides functional 20(21 ) Both distal lobes generally ofsame size ........................ u ....................Parisolabidinae 21 (20) One of the distal lobes shorter in length (somewhat of carcinophorid type) ............ ................................. ,................................................................................... Isolops~dit:1ae 22(] 9) Right distal lobe atrophied, left distal lobe generally enlarged (genitalia appears to be of Labiid type but proparame,res paired) u ................................... .Is01aboidinae Key to genera of Anisolabidinae (on males only) I (2) Parameres long, over 10 times longer than broad, narrow, ,sometimes broader at base ..... 0 0 0 •••• 0 ••••••••••••• 0 ••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 0 ••• 0 ••••• 0 • Epilandex Hebard (=Capralabis Brindle Syn.nov.) 2 (1) Parameres less than 10 times longer than broad 3 (9) Parameres excised apically or armed along the internal or external margin 4 (5) Parameres excised apically
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