Ettchellsia hainanensis Chen & Liuhe, 2021

Chen, Hua-yan, Liuhe, Bo-jing & Zhang, Xiao, 2021, Two new species of the family Megalyridae (Hymenoptera) from China, ZooKeys 1043, pp. 21-31 : 21

Ettchellsia hainanensis Chen & Liuhe sp. nov. Figures 3 , 4

Diagnosis.

Frons irregularly rugose (Fig. 3C ); clypeus largely punctate rugose (Fig. 3C ); vertex posterior to lateral ocellus smooth anteriorly and reticulate-rugose posteriorly (Fig. 3D ); gena smooth (Fig. 3E ); metanotum puncate and setose medially (Fig. 4A ); median propodeal region not narrowed (Fig. 4A ); metasoma (Fig. 4C ) smooth except tergite 6 largely coriaceous.

Description.

Female (holotype). Body length 4.9 mm. Color. Head black, mesosoma largely black except mesoscutum and axill reddish brown and tegula brown, metasoma mainly black with posterior margin of terga dark brown; mandible dark brown with teeth darker; antenna brown to dark brown with apical flagellomeres paler; trochanters and tarsi of fore and mid legs pale yellow, remainders of the legs brown to dark brown; trochanter and tarsus of hind leg brown, femur dark brown to black, coxa and tibia black; dorsal surface of hind tibia with both white and black long setae; basitarsus with white long setae; forewing with four transverse dark brown bands; ovipositor sheath black; ovipositor reddish brown.

Head (Fig. 3C-E ) 1.5 × wider than long in dorsal view, covered with long black erect setae and relatively short decumbent white setae; frons irregularly rugose; vertex convex, with ocellar triangle smooth, except by a median row of longitudinal punctures, area between ocelli and eyes smooth with a row of longitudinal punctures arising from lateral ocellus and parallel to orbit; vertex posterior to lateral ocellus smooth anteriorly and reticulate-rugose posteriorly; POL = 4.7; OL = 3.4; OOL = 4.0; eye margined posteriorly by a groove and a single postocular oribital carina, the groove smooth anteriorly and foveate posteriorly; gena smooth; occipital carina foveate; clypeus largely punctate rugose, apical margin slightly incise medially; mandible with 3 teeth; antenna filiform, A3-A6th flagellomeres subequal and the longest, remainder flagellomeres becoming shorter.

Mesosoma (Fig. 4A, B ) covered with short decumbent white setae; scattered, long, erect, black setae present on mesonotum; mesoscutum humped, anterior surface smooth, dorsal surface largely smooth with fine punctures, median mesoscutal sulcus present and foveate, lateral carina of anterior surface present; axilla and mesoscutellum largely smooth with fine punctures; metanotum puncate and setose medially; propodeum with pairs of median, submedian, and lateral longitudinal carinae; median propodeal region not narrowed, with four complete and two incomplete transverse carinae, posterior margin producing dorsally; submedian region with two complete transverse carinae; lateral region with four complete transverse carinae.

Legs (Figs 3B , 4E ). Hind femur punctate and rugose medially; hind tibia longitudinally rugose; hind tibia covered with both white and black long erect setae, longer than the width of the hind tibia; basitarsus covered with white long erect setae, longer than the width of the hind tibia.

Wings (Fig. 4D ). Forewing with vein M 1.9 × basal part of vein RS; erect setae on vein C 0.5 × those on vein Sc+R and A.

Metasoma (Fig. 4C ) smooth except tergite 6 largely coriaceous; ovipositor 1.76 × mesosoma length, apex with small teeth and single knob.

Variation. The body length of the paratype female 5.0 mm; antenna dark brown to black; mesoscutellum reddish brown; median propodeal region with seven complete transverse carinae; other characters similar to the holotype.

Male. Unknown.

Etymology.

The specific epithet refers to Hainan Island, where the type locality is located. It is treated as a noun in apposition.

Material examined.

Holotype, female, China: Hainan, Qiongzhong, Mount Limushan , 19°10.771'N, 109°46.225'E, 20-22.vii.2020, forest, sweep, Huayan Chen, SCAU 3049429 (deposited in SYSBM) . Paratype: 1 female, China: Hainan, Qiongzhong, Mount Limushan , 19°10'23.28"N, 109°46'40.79"E, 30.xi-31.xii.2020, forest, Malaise trap, Longlong Chen, SCAU 3042295 (SYSBM) .

Distribution.

Oriental region, China, Hainan Province.

Remarks.

Ettchellsia hainanensis is most similar to E. sinica He, which was previously described based on a single female from Yunnan of China, but E. hainanensis can be distinguished from E. sinica by the following characters: frons irregularly rugose (Fig. 3C ); clypeus largely punctate rugose (Fig. 3C ); POL distinctly longer than OL (Fig. 3D ); metasomal tergite 5 smooth (Fig. 4C ). We contacted the curators of the Hymenoptera collection of Zhejiang University (previously known as Zhejiang Agricultural University) where the holotype of E. sinica claimed to be deposited, but they failed to find the type. If the holotype were confirmed to be lost, a neotype of the species may need to be designated based on a specimen collected from the type locality in the future.

Figures

Figure 3. Ettchellsia hainanensis Chen & Liuhe, sp. nov., female, holotype (SCAU 3049429) A habitus, dorsal B habitus, lateral C head, frontal D head, dorsal E head, lateral F antenna.

Figure 4. Ettchellsia hainanensis Chen & Liuhe, sp. nov., female, holotype (SCAU 3049429) A mesosoma, dorsal B mesosoma, lateral C metasoma, dorsal D wings E hind leg, lateral F apical ovipositor, lateral.