Eretmocerus tongxiaoensis Shih & Polaszek, 2015

Shih, Yuan Tung, Polaszek, Andrew, Dubey, Anil Kumar, Chen, Shu-Pei, Yang, Ping-Shih & Ko, Chiun-Cheng, 2015, New species of Eretmocerus Haldeman (Hymenoptera: Aphelinidae) parasitizing Crenidorsum turpiniae (Takahashi) and Aleurothrixus floccosus (Maskell) (Hemiptera: Aleyrodidae) from Taiwan, Journal of Natural History 50, pp. 377-391 : 385-389

publication ID	https://doi.org/ 10.1080/00222933.2015.1075622
DOI	https://doi.org/10.5281/zenodo.4329422
persistent identifier	https://treatment.plazi.org/id/03FD422B-907C-CA69-FEDF-B63CFDB3FEFA
treatment provided by	Carolina
scientific name	Eretmocerus tongxiaoensis Shih & Polaszek
status	sp. nov.

Treatment

Eretmocerus tongxiaoensis Shih & Polaszek , sp. nov.

( Figures 4 View Figure 4 , 5 View Figure 5 )

Diagnosis

Females of E. tongxiaoensis sp. nov. can be identified by having 6 setae on the mid lobe of the mesoscutum; an elongate, brown, cylindrical antennal clava, 7.1 – 7.88× as long as wide ( Figure 4C View Figure 4 ); a long ovipositor which is approximately the same length as the clava; and a narrow fore wing, about 2.53× as long as wide ( Figure 5D View Figure 5 ). Among the known Eretmocerus species from Taiwan, only E. orientalis Gerling has brown antennae, but has 4 setae on the mid lobe of the mesoscutum. All other Eretmocerus species in Taiwan have pale yellow or yellow antennae. E. tongxiaoensis shares having 3 paired setae laterally on T6 with E. queenslandensis , from which it differs by a shorter maximum fore wing fringe (0.25x wing disc;> 0.3 in E. queenslandensis ).

Description (female holotype).

Length 0.75 mm (Paratypes, 0.58 – 0.75 mm (n = 5).

Colour. Head yellow. Mesosoma orange-yellow except dorsellum, propodeum brown to dark brown. Gaster yellow except T7 brown anteriorly and laterally.

Antennae amber. Wings hyaline. Legs pale yellow.

Head. Vertex with 14 – 16 pair of setae. Face and occiput with transverse substrigulate sculpture, interscrobal area vertically substrigulate. Parascrobal area with 35 – 36 setae, 6 setae close to the edge of the eyes. Supraclypeal area with 5+5 setae, 2 posterior setae longer. Lower face with 20 – 24 setae. Clypeus with 2+2 setae, 2 setae longer ( Figure 4A View Figure 4 ). Upper posterior head with 25 – 27 setae, 2 pairs short and robust setae close to the edge of eyes. Lower posterior head with 8+9 setae ( Figure 4B View Figure 4 ).

Antenna ( Figure 4C View Figure 4 ). Radicle 3.6× as long as wide; scape 3.5× as long as wide, 2.70× as long as radicle, 1.84× of pedicel length, 0.54× of clava length; pedicel 2.88× as long as wide, 1.50× as long as radicle, 0.54× of scape length. Funicle I triangular-trapezoid, dorsal length 0.4× ventral length. Funicle II wider than long. Clava cylindrical, narrowed at apex, 5.0× as long as greatest width, 1.83× of scape length, 3.69× of pedicel length. Scape with one large sensillum close to the end. Clava with one large longitudinal sensillum and one thick sensillum close to the clava apex. Clava with 7 articulated spines.

Mesosoma ( Figure 5A View Figure 5 ). Mid lobe of mesoscutum with 6 setae, anterior part with cellular reticulate sculpture, remainder with faint elongate reticulations. Each side lobe with 3 setae, anterior margins with elongate cellular reticulations; axilla with 1 seta, strongly reticulate. Scutellum with 4 setae, anterior pair shorter, 2 placoid sensilla laterally, closer to the posterior pair of setae, and sides with faint, elongate reticulations. Frenal arms short and not exceeding metanotum. Metanotum slightly narrower centrally than propodeum. Propodeum with strong transverse reticulations, central lobe broad and smooth, reaching half the length of gastral tergite I.

Wings. Fore wing ( Figure 5D View Figure 5 ) 2.53× as long as maximum width of disc. Longest posterior alar fringe 0.24× of disc width. Base of wing without setae, distal portion of costal cell with 7 setae. Marginal vein with 3 long setae, 9 – 25 setae between marginal vein and partial linea calva. Submarginal vein 1.50× as long as marginal vein and 2.81× of stigmal vein length. Marginal vein 1.56× stigmal vein length.

Legs ( Figures 4D–F View Figure 4 ). Mid tibial spur 0.34× basitarsus length. Hind tibial spur 0.37× basitarsus length.

Gaster ( Figure 5B View Figure 5 ). Gastral tergites I – VI with reticulations on lateral margins; paired setae as follows: 2, 2, 2, 3, 4, 4. Syntergum (T7) with 6 setae. Ovipositor prominent, exserted, nearly equal (0.93×) to length of clava, 2.13× length of scape, 0.94× length of mid tibia.

Male. Unknown.

Holotype ♀ (on slide), Taiwan: Miaoli, ex Crenidorsum turpiniae ( Takahashi) on Turpinia formosana Nakai , 11 April 2011, Y.T. Shih ( NTU).

Paratypes: 5♀♀ (on slides), data same as the holotype . (1♀ BMNH, 4♀ NTU) .

Distribution

Taiwan: Tongxiao: Miaoli County.

Host

Hemiptera : Aleyrodidae : Crenidorsum turpiniae (Takahashi) (= Aleurotrachelus turpiniae Takahashi ).

Remarks

Eretmocerus tongxiaoensis resembles E. rui Zolnerowich & Rose (2004) , but differs from it in having antennae and T7 brown (antennae and T7 are yellow in E. rui ).

Etymology

The species is named after the type locality Tongxiao. Residents of this area kindly helped during collection.

New records of Eretmocerus species from whiteflies and Taiwan

Five Eretmocerus species are recorded here for the first time from Taiwan, of which four species provide new records for their host whiteflies. These are: E. bisetae from Dialeurodes citri ; E. flavus from D. citri and Bemisia sp. (= Lipaleyrodes sp.); E. rui from B. emilae and C. turpiniae ; and E. trialeurodis from B. emilae and T. vaporariorum . Details of voucher specimens are given below.