Societe Royale D'entomolocie De Belcique
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271 TOME 100 MARS 1964 NUMERO 6 BULLETIN 6' ANNALES DE LA SOCIETE ROYALE D'ENTOMOLOCIE DE BELCIQUE Association sans but lucratif, fondée le 9 avril 185'5 Publié avec le concours .... Ministère de l'Education Nationale et de la Culture et de la Fondation Universitaire de Belgique OPHIOCELAENO SELLNICKI, A NEW GENUS AND SPECIES OF DIPLOGYNIIDAE ASSOCIATED WITH SNAKES (Acari-Mesostigmata) (') Donald E. JOHN5TON (2) and Alex FAIN (3) The mesostigmatid mites of the superfamily Cdaenopsoidea kurrently comprised of the families Celaenopsidae, Euzerconidae, Diplogyniidae, and Schizogyniidae) are typically associated with arthropods or free-living, as adults. A prominent exception to this ecological generalization is the schizogyniid, Indogynium lindbergi Sellnick, 1950, which was described from specimens colleded from three genera of snakes in the Palni Mts. of southern India. Tiheassociation of Indogynium with a reptile has been questioned by Strandtmann and Wharton (1958) who correctlypoint out that snch an instance runs 'COunter to what we know of the Ce1aenop soidea. It must be admitted, however, that not much is really known about celaenopsoid mites and, further, there is a paralle1 (and in this instance, undoubted) case in the Antennophoroid'ea in which a single genus, OphiomegistusJ is a parasite of snakes and (1) Based on work supported, in part, by National Science Foundation Grant G. 19325. (2) Institute of AQarology', Ohio Agricultural E~periment Station, Wooster, Ohio, U.S.A. (3) Institut de Médecine Tropicale, Anvers, Belgique. 80 Bull. A ml. Soc. Roy. Ent. Betg., 100, 1<)64 BuLl. Ann. Soc. Roy. E'I" lizards although alI other genera are associates of arthropods. This question of true vertebrate- association is again opened for the Celaenopsoidea by the 3ippearance of a second lot of specimens associated with snakes. This material ,consists of II4 adult males and females, representing a new genus and species of Diplogy niidae, taken from Typhlops sp. in Bougainville. The specimens weI1e among a large lot of Acari received recently from Dr. H.M!. Levi of the Museum of Comparative Zoology, Harvard University, and we are most grateful to Dr. Levi for this interestingmaterial. DIPLOGYNIIDAE Ophioce1aeno n.'gen. (4) Idiosoma broadest at leve1 of region ,between coxae III aI1Jd IV; narrowed in region of opisthosoma; not acute posteriorly. Dorsal shield markedly hieterotrÏ>chous; with alI interior setae reduced. Marginal dorsal setae short, spine-like laterally {ra pairs) ; e1on gate posteriorly (5 pairs). IWith 3 pairs of elongate sUlbmarginals. No dorsal neotrichy. Sternal shield of female relatively long and with sternal setae II dose together; sternals l and III well sepa rated; all sternal sebae at separate leve1s. LaÜgynial shields not excavated anteriorly; with 2 pairs of setae. Ventral and anal shi'elds fused; no ventral neotrichy. Cheliœrae with digits relati vely narrow; with many smalI, closely-set teeth. Male with late rally :flattened, spoon-shaped process on fixed digit and horn-like process on disti-ventral margin of cheliceral base. Tectum with median rib reduced in anterior half. AlI legs relatively short, stout. Type species: Ophiocelaeno sellnicki n.sp. Ophiocelaeno sellnicki n.sp. (5) FEMALE. Idiosoma rounded anteriorly, with moderate shoulders; widest at level between coxae III and IV and narrowed poste riorly. Length of idiiosoma 789-853 [J. in II specimens measured. FIG. 1. (4) Because of the lack of comparative studies in the Diplogyniidae, this and an previous generic diagnoses should not be taken too seriously. (5) This s,pecies is named for our friend and colleague, Dr. Max Sell nick (Deutschland). ~y. Ent. BÛg., 100, IC)64 Bull. Ann. Soc. Roy. Ent. Bûg., 100, IC)64 8r .ciates of arthropods. :l is again opened for =cond lot of specimens ;ts of II4 adult males " , ,/f---,!) --. "'-f :l species of Diplogy ®@w"------ -'/:':~/\~1\ " :Iville. The specimens ;./ ---li> li> ':t\~ ently from Dr. H .,W. ;:;.' . ~~~. J Harval'd University, . /", " ".{\' :; interesting materia1. ff;f: ~ .'. ~'t\~ '3 Qo \, ))\ \ 1 /1 r,' . .. Il ~,o"g".,,~(1), • 0 0 ~.\\• ,\~l (l, r::,'." 0, Cl, 0,,0,"cff",'o@ 1~ 'iD / ' ID%Q~,s.o'0 "" Ç) '/1/1 1 0 ~n coxae III and IV; '1/1 / ' ., ° :;' "''' '.'\ .te posteriorly. Dorsal li ." ". 'r )"<1'. 1 1 nterior setae reduced. r ~, (l "V\ ' . .; :-ally (ro pairs) ; elon JI' , .. " 1 ' l" " •••••., ." • 1 , longate swbmarginals. le relatively long and !:\,'~ ". "'.,/<~ "' .• y\ e= , '>'''" , s l and III weIl sepa ~ ,", 3-' M' "''''.(!) {18 • "" / " \1 ::"atigynial shields not 'o.~ /'Nli~ '1 .' /'-,;.' 0 "'-'j' .. :le. Ventral and anal ~i ~ \ "N---.' 0 rae with digits relati Il!) 0 0 // ~J " , '>~'---r' 1 10 f(J/ J--J-,.-J/,,/ 0 -;Q\1G ' leeth. Male with late ' \ ' \ I_~ /'j<! ~d digit and horn-like )\. '8-\~/\ '> '~ '.____>\ //À , ~/ ,':1--.../t>"----~o II-x,/,-. /\: • :lI base. Tectum with ' <li 1 \ y / _ / --l?-',,;, J. '~ 0 ~. legs relatively short, i/~/1 ~,'v, /') /'U"""", .' /\::) j"2!Jft) r _ 0' ---...'. '~i 0"~-i <!l" 1 \, ,/:'", '~ .... <:> '.?'--. \ _ / • p. \'hi":" ; ........ , .. '- ':----; (il ~ (il ly . (5) ~ '1 h moderate shoulders ; and narrowed poste specimens measured. FIG. 1. - Dorsal view of idiosoma of female. ~s in the Diplogyniidae, .t be taken too seriously. ~ol1eagcue, Dr. Max Se1l Bull. Ann. Soc. R ay. Ent. Belg., 100, 1964 Bull. Ann. Soc. Roy. E Dors'llm. \IF' Lg'llre 1 withcomplex parata . a.ddition to l 'lln1J postenarIn . ta 1,.. Setal FIG. 3. estigial setae; 3 FIG. 2. - Ventral Vlew. of 1'dosoma of female.. or v . 1 ç 15 palrs. of margIna ~ Venter. (Figures ~ lacInlae... Sternal shle y. Elit. Bûg., roo, rC)64 BuU. Ann. Soc. Roy. Ent. Belg., roo, r964 83 Dorsum. {Figure I) Dorsal shield markedly heterotrichous and withcomplexporotaxy. Forty-two pairs of dorsal setae present in addition to l unpail1ed (and often assymetrically placed) seta j---~ posterior to i,. Setal complement consisting of 24 pairs of short ~ \ U v li .3 FIG. 3. Sterni-genital region of female. or vestigial setae; 3 pairs of long, curved submarginal setae; . of f,emale. I5 pairs of marginal setae of which posterior 5 pairs are enlarged. Venter. (Figmes 2 and 3) Tritosternum normal; with 2 spinose laciniae. Sternal shield with thickened anterior margin. Sternal Bull. Ann. Soc. Roy. Ent. Belg., 100, 1964 Bull. Ann. Soc. Roy. El setae I long, s'pine-like; reaching to leve1 of sternal setae II. SternaIs II small; in center of sternal shield; about one-third as far apart as sternals r. Sternals III short; about the same distance 3Jpart as sternals r. Metasternal shidds free; setae very small. Latigynial shields with antero-Iateral margins concave, not incised; with 2 pairs of setae. Latigynials I approximate1y in center of shie1d; latigynials 2 on median margin just anterior to the small, triangular mesogynial shield. Ventral shie1d fused with peritremal-pampodal complex and with anal shie1d; V-shaped, with slightly convex sides; reaching almost to posterior margin of opisthosoma. Ventral shield bearing 4 pairs of ventral and 2 pairs of paranal setae. Ventri-Iateral shields each with long, sigmoid ridge in the posterior half; a pair of setae at the hind margin. Anus surrounded by a group of branched integumentary (? glandular) canals. Gnathosoma (6). (Figures 4 and 5) Tectum triangular in out line; sides smooth and gently concave; extending almost to distal end of palp femur; median rib restricted to basal half. Suibcapi tuh1m large; well sc1erotized. Hypotome well developed, reaching past level of palp trochanter; distally expanded and bifurcate. (( Hypopharyngeal »processes filamentous, smooth, œntrrally rihbed; long, reaching past leve1 of palp genu. Hypostomal pro cesses pres'ent, originating just mediad of corniculi; reaching almost to level of tip of corniculus. Corniculi heavy, saber-like; reaching to or slightly beyond leve1 of distal margin of palp trochanter. Hypostomal setae in oblique row; lightly serrate; de creasing slightly in length from anterior to posterior pair.. Sub capitular setae serrate; subequal in length with posterior hypos tomaIs. (( Deuterosternal » column with (modal) 3 finetooth files. La:brum {epipharynx of Gorirossi) finely s']Jinose dorsally; smooth ventrally. Chdioeral digits (Figure 5) relatively long, thin; with many small, c1osely-set teeth in addition to basal locking teeth. Pilis dentilis vestiga1. Dorsal seta of chelicera not observed. Mo vable digit with 2 tree-like ex'cresences and. a single saber-like excresence with small setules. Chaetotaxy of palp trochanter, femur, genu and tibia: 2-5-7-15. Pretarsus with 2 claws. Legs re1ativdy short; II-IV quite stout. Pretarsus present on FIG. 4. - V (6) The terminology applied to the gllathosoma fol1ows, in gelleral, thjat of Gorirossi (1955). JY. Ent. Berg., 100, 1'164 Bull. Ann. Soc. Roy. Ent. Belg., 100, 1964 85 _ of sbernal setae II. jeld; about one-third :lort; about the same l~elds free; setae very _margins çoncave, not ;s l approximately in largin just anterior ta :ltrai shield fused with laI shield; V-shaped, ;t to posterior margin pairs of ventral and jelds eaà with long, ~ of sdae at the hind .anched integumentary um triangular in out ~nding almost to distal 0() basal half. Suibcapi ~ll developed, reaàing panded and ,bifurçate. us, smooth, œntmlly -enu. Hypostomal pro )f corniculi; reaching :uli heavy, saber-like; Estal margin of pal.p N; lightly serrate; de :0 posterior pair._ Sub la"Ah l • t, with posterior hY'pos lodal) 3 finetooth files. JI''':::::'~:1 inose dorsally ; smooth «t r....· J :ively long, thin; with 1 \.., :0 basal locking teeth. ~era not observed. Mo nd a single saber-like y of palp trochanter, nn with 2 claws. Pretarsus present on FIG. 4. - Ventral view of gnathosoma of femaàe. :mla follows, in gelleral, 86 BulL A I1n. Soc. Roy. Ent. Belg., 100, 1964 Bull. Ann. Soc. Roy. E legs II-IV; lacking on leg 1. Chaetotaxy of legs as follows (using the system of Evans, 1903) : l II III IV .