Signiphora xanthographa Blanchard, 1936

Woolley, J. B. & Dal Molin, A., 2017, Taxonomic revision of the flavopalliata species group of Signiphora (Hymenoptera: Signiphoridae), Zootaxa 4315 (1), pp. 1-150: 96-100

publication ID

https://doi.org/10.11646/zootaxa.4315.1.1

publication LSID

lsid:zoobank.org:pub:4B923D2F-4D36-4AA1-BAC9-C9F1CE20E87B

persistent identifier

http://treatment.plazi.org/id/8E21B933-FFD0-7C53-FF64-715CFCC12836

treatment provided by

Plazi

scientific name

Signiphora xanthographa Blanchard, 1936
status

 

Signiphora xanthographa Blanchard, 1936  

Figures 361–376 View FIGURES 361 – 364 View FIGURES 365 – 370 View FIGURES 371 – 376

http://eol.org/pages/855928

Signiphora xanthographa Blanchard, 1936: 18   . Female, male.

urn:lsid:zoobank.org:act:77E817D3-1CEF-4A1C-90EB-A9837D6DFE9F

Diagnosis. Fore wing marginal vein with seta M1; sculpture on vertex, frons and mesoscutum reticulate to strongly reticulate; antennal clava very short (clava length:scape length 1.20–1.57) with a uniform pale brown color; Length Mt1:length Mt 2 in female usually 0.66 (0.50–0.66); male metasoma uniformly brown to apex. Males common. S. xanthographa   is most similar to S. coquilletti   , S. aleyrodis   , and S. flavella   . It is distinguished from S. coquilletti   and S. aleyrodis   by the reticulate sculpture, the short antennal clava (clava length:scape length for S. coquilletti   females 1.52–1.82); and the male coloration. It is distinguished from S. flavella   by the preceding attributes and by the medial emargination on the anterodorsal margin of Mt8 (the anterodorsal margin of Mt 8 in S. flavella   is transverse and without a medial emargination).

Description. Female. Length, anterior margin of pronotum to epiproct apex, 0.43–0.76 mm (n=31). Head brown, somewhat lighter brown on frons. Antenna uniformly tan, antennal clava occasionally dusky at apex. Pronotum uniformly light brown to light brown in medial 2/3. Mesoscutum brown in anterior 1/2–5/6 and in medial 2/3, yellow to pale yellow in posterior 1/2–1/6 and laterally. Scutellum and metanotum pale yellow. Propodeum including medial sclerite pale yellow except light brown along posterior margins of each. Mt1 and anterior 1/2 of Mt2 light brown, Mt3–Mt4 dark brown, Mt5–Mt7 yellow or light brown, occasionally with Mt4– Mt7 yellow or with metasoma uniformly brown to apex. Ovipositor sheaths dusky. Legs pale yellow. Fore wing infuscated from base to slightly beyond distal end of stigma vein, with usual hyaline areas at wing base.

Head. Mandibular ducts enlarged apically. Pedicel length:scape length 0.52–0.78; 3 anelli, second anellus from 1.5–3.0× length of the first, third from 1.5–4.0× length of the first; clava length:scape length 1.20–1.57. Vertex and frons reticulate to strongly reticulate, frons with four longitudinal rows of minute punctations.

Mesosoma. Pronotum transversely reticulate to transversely imbricate. Mesoscutum reticulate to strongly reticulate, often transversely reticulate in anterior 1/3. Scutellum, metanotum and medial sclerite of propodeum weakly reticulate to transversely and weakly reticulate. Scutellum with 4 setae and 2 campaniform sensilla. Medial propodeal sclerite rounded, process on medial sclerite rounded or pointed apically. Fore wing length:width 2.8–3.5; fore wing LMS:fore wing width 1.1–1.7; marginal vein:stigmal vein 1.9–3.1; marginal vein with 6 dorsal setae and no ventral setae, rarely without seta M1; seta M3 length:marginal vein length 0.33–0.57; apical end of costal cell at seta M1–M2. Hind wing with subparallel margins, length:width 6.7–10.7; hind wing width:fore wing width 0.29– 0.47; LMS hind wing:hind wing width 2.5–4.5. Mesofemur with 1 long spine and 1 short spine in posteroapical margin, mesotibial spur with 3–5 teeth; mesotibial spur length:basitarsus length 0.63–1.13; basitarsus length:mesotibia length 0.39–0.50.

Metasoma. Mt1 strongly bilobed with medial portion transverse or rounded; Length Mt1:length Mt2 1.0–2.0; ovipositor with anterior-most portion lying under Mt2–Mt4; ovipositor length:metasoma length 0.42–0.96; ovipositor sheath length:ovipositor length 0.20–0.29; Ms3–Ms6 with anterior projections short to medium; Ms 6 in posterior 1/4 metasoma and with 8–10 setae; Mt8 with anterodorsal margin with a rounded medial emargination and with anterolateral margins transverse.

Male. Length, anterior margin of pronotum to epiproct apex, 0.40–0.65 mm (n=20). As described for female except the following: anterior 1/2–3/4 and medial 2/3 mesoscutum brown, scutellum to propodeum yellow to pale tan, medial sclerite of propodeum occasionally tan or pale brown. Metasoma uniformly brown to apex, occasionally with Mt6 and Mt7 lighter than preceding terga. Antennal clava length:scape length 1.2–1.8, mesotibial spur with 2–4 teeth; Ms8 a narrow transverse strip, without an anterior projection, extending past cerci laterally. Genitalia normal for the flavopalliata   group, digitus length 2× its width, digitus with one short apical denticle and one seta at its midpoint.

Discussion. De Santis (1973) recognized the similarity between S. townsendi   and S. xanthographa   and he stated that with further study the latter might come to be regarded as a subspecies of the former. We believe S. townsend   i and S. aleyrodis   (q.v.) to represent the same species for the reasons given above, and have synonymized the former under the latter. The type specimens of S. xanthographa   have the strongly reticulate sculpture on the vertex and mesoscutum characteristic of this species, but are somewhat unusual in that Mt5–Mt7 are concolorous with Mt1–Mt4. However, females with this metasomal coloration are common in the long series collected by DeBach and Rose in Brazil and Argentina. In some specimens in a series from Palmira, Valle de Cauca, Colombia (collected by Fred Bennett from Bemisia tabaci   on Glycinis max, TAMU-ENTO X046246, X0616124, X0616129– 136, FSCA); the sculpture on the frontovertex and occasionally the mesoscutum is transversely imbricate, as in S. aleyrodis   . In addition, the coloration of Mt4–Mt 6 in males is also somewhat lighter that the basal tergites, also characteristic of S. aleyrodis   . We are treating these as S. xanthographa   , but as discussed above under S. aleyrodis   , it is quite possible that there are additional cryptic species involved that have this morphotype. Two specimens are known from Asia: TAMU-ENTO X0852767 ( FSCA) coll. H.W. Browning ex: whitefly in Thailand (94-533-18); and UCRC ENT 299588, Hong Kong, New Territories, Bible Institute, coll. Cheng, 18-VII-1971, ex Aonidiella aurantii   on Cycas revoluta   , R71-55-c. The host record for the Hong Kong specimen is unusual for this species, but otherwise the specimen fits the diagnosis.

Type material. Signiphora xanthographa   — LECTOTYPE ♀ [here designated]: Cotypus 688, INTA, ARGENTINA, [ENTRE RIOS], Parana, coll. Baez, V-1936, ex Aleurotrixus [sic]   . PARALECTOTYPES: data as lectotype, 1 ♀ and 3 ♂, S. xanthographa   was described by Blanchard (1936) from two ♀ and three ♂ specimens on one slide, No   . 688 Cotypus, INTA. The ♀ to the lower right (slide oriented with the two labels bearing species name and type number to the right) is here designated lectotype and the slide has been labeled accordingly.

Other material examined. ARGENTINA: Buenos Aires: 3 mixed series. UCRC ENT 299563–299564, 299572 ( UCR)   . ARGENTINA: Santa Fe: 1 sex unknown. BMNH (E) 990222 ( BMNH)   . ARGENTINA: 2 sex unknown, 8 mixed series, 3 ♀, UCRC ENT 299560–299562, 299565–299571, 299573–299575 ( UCR)   . BRAZIL: Bahia: 3 ♀, USNM ENT 763119   –763121 (USNM). BRAZIL: Mato Grosso do Sul: 2 ♀, USNM ENT 763122   – 763123 (USNM). BRAZIL: Pernambuco: 2 ♂, 2 ♀, UCRC ENT 299533   –299536 (UCR). BRAZIL: Rio de Janeiro: 1 sex unknown, 21 mixed series, 2 ♀, UCRC ENT 299527–299532, 299539–299555, 300236 ( UCR)   . BRAZIL: Sao Paulo: 4 mixed series, 2 ♀, UCRC ENT 299537–299538, 299556–299559 ( UCR)   . CHILE: 1 ♂, 7 ♀, BMNH (E) 991089, 991090 ( BMNH)   ; TAMU-ENTO X0616373–X0616377, X0855988 (TAMU). CHINA: Hong Kong : 1 ♂, UCRC ENT 299508 View Materials ( UCR)   . COLOMBIA: 3 ♂, 5 ♀, TAMU-ENTO X0460246, X0616124, X0616129, X0616130, X0616131, X0616132, X0616135, X0616136 ( FSCA)   . PERU: 1 mixed series, 6 ♀, UCRC ENT 299509   –299515 (UCR). THAILAND: 1 ♀, TAMU-ENTO X0852767 ( FSCA)   . TRINIDAD AND TOBAGO: 1 ♀, BMNH (E) 990221 ( BMNH)   . URUGUAY: 4 ♂, 7 ♀: UCRC ENT 299516   –299526 (UCR); 20 pinned specimens: USNM ENT 763509–763528 (USNM).

Biology. This species is biparental and has been reared primarily from Aleyrodidae   of the genera Aleurothrixus Quaintance and Baker, Aleyrodes   , and Tetraleurodes Cockerell. Of   the two records from Diaspididae   , one was a mixed rearing-sample containing A. floccosus   and L. gloverii   and one was from C. aonidum   . In his description, Blanchard (1936) stated that this species is an internal parasitoid of Aleurothrixus floccosus   and A. howardi (Quaintance)   . Slide-mounted host material from Argentina and Brazil collected by Rose and DeBach provides conclusive evidence that S. xanthographa   is an external hyperparasitoid of Amitus spiniferus (Brèthes)   ( Platygastridae   ) pupae in A. floccosus   . Rose observed the ovipositional behavior on A. floccosus   in Argentina and in the UC-Riverside quarantine laboratory and noted that oviposition occurred only when females were provided with parasitized hosts (Rose, personal communication).

LMS

Carolina Biological Supply Company

FSCA

Florida State Collection of Arthropods, The Museum of Entomology

UCRC

University of California, Riverside

ENT

Ministry of Natural Resources

UCR

University of California

USNM

Smithsonian Institution, National Museum of Natural History

PERU

Universit� di Perugia

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Signiphoridae

Genus

Signiphora

Loc

Signiphora xanthographa Blanchard, 1936

Woolley, J. B. & Dal Molin, A. 2017
2017
Loc

Signiphora xanthographa

Blanchard 1936: 18
1936