Druon hansoni Pujade-Villar, 2022

Cuesta-Porta, Victor, Melika, George, Nicholls, James A., Stone, Graham N. & Pujade-Villar, Juli, 2022, Re-establishment of the Nearctic oak cynipid gall wasp genus Druon Kinsey, 1937 (Hymenoptera: Cynipidae: Cynipini), with description of five new species, Zootaxa 5132 (1), pp. 1-92 : 27-30

Druon hansoni Pujade-Villar , sp. nov.

Figs. 57–68

http://zoobank.org/ urn:lsid:zoobank.org:act:68674845-2A5F-488E-BC6F-549A78AA908B

Type material. Holotype female: “ Costa Rica, Guanacas , Parque Nacional Santa Rosa, 200 masl ,, ex Q. oleoides Schltdl. & Cham. , leaf gall; 1990.iv.13, leg. S. Hocking & P. Hanson ”; 3 female paratypes labeled as the holotype except for: 1990.iv.05; 1989.ix . Holotype female and 2 female paratypes are deposited at the UB, 1 female paratype in the PHDNRL .

Etymology. Named after Paul E. Hanson, professor, and curator of the Zoology Museum at the Costa Rica University (UCR), collector of the new species and colleague.

Diagnosis. The new species belongs to the Druon species group with completely rusty brown head and body, smooth or micropunctured metasoma, median mesoscutal line absent and notauli complete (comprising D. hansoni , D. pattoni , D. quercuslanigerum var. fuscum , D. receptum , D. rusticum ). The new species closely resembles D. quercuslanigerum var. fuscum , having elevated ocelli in frontal view, distal flagellomeres broadened ( Fig. 61 ), but differs in the transversally ovate head with genae not broadened behind the eyes in frontal view ( Fig. 57 ) (head trapezoid with genae broadened behind the eyes in frontal view in D. quercuslanigerum var. fuscum ( Fig. 164 )).

Description. Asexual female ( Figs. 57–67 ). Head, mesosoma rusty brown; antennae yellowish, sometimes distal half darker; metasoma slightly paler than mesosoma; mouthparts, legs yellowish.

Head alutaceous, transversally ovate, 1.2× as broad as high and slightly broader than mesosoma in frontal view, with sparse setae, denser on lower face; 2.1× as broad as long in dorsal view. Gena alutaceous, not broadened behind eye in frontal view. Malar space with striae radiating from clypeus and reaching eye; eye 3.5× as high as length of malar space. Inner margins of eyes parallel. POL 3.3× as long as OOL, OOL slightly shorter than diameter of lateral ocellus and shorter than LOL, all ocelli ovate, of same size. Transfacial distance slightly shorter than height of eye; toruli located in mid height of head, frons nearly as high as lower face, diameter of antennal torulus 2.0× as long as distance between them, distance between torulus and eye 1.5× as long as diameter of torulus; lower face with numerous delicate striae, forming a network of interrupted rugae, with white setae; slightly elevated median area reticulate, glabrous, with a few setae. Clypeus ovate, broader than high, smooth, sparsely pubescent, with delicate parallel longitudinal striae; ventrally rounded, not emarginate and without median incision; anterior tentorial pit rounded, distinct, epistomal sulcus distinct, clypeo-pleurostomal line well impressed. Frons uniformly alutaceous, without striae or setae, interocellar area alutaceous. Vertex, occiput and postocciput, postgena alutaceous, glabrous, with a few setae; posterior tentorial pit large, elongated, area below impressed; occipital foramen slightly short-er than height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci which diverge strongly toward occipital foramen, postgenal bridge anteriorly slightly broader than occipital foramen. Antenna longer than head+mesosoma, with 11 flagellomeres, sometimes F11 partially divided, pedicel longer than broad; flagellomeres sequentially broadening towards apical end of antenna; F1 2.0× as long as pedicel and as long as F2; F2 1.2× as long as F3; F3 slightly shorter than F4, F5 to F10 progressively shorter in length; F11 2.4× as long as F10; placodeal sensilla on F5–F11.

Mesosoma only slightly longer than high, with a few white setae, setae denser along propleuron and on lateral propodeal area. Pronotum with delicate parallel striae and sparse setae laterally; propleuron smooth, glabrous, with delicate transverse parallel striae ventrally. Mesoscutum uniformly and entirely reticulate, with white setae on anterior margin and along notauli, as broad as long (greatest width measured across mesoscutum level with base of tegulae). Notaulus complete, traceable along all its length, strongly converging posteriorly; at posterior end the distance between notauli shorter than distance between notaulus and side of mesoscutum; anterior parallel line absent; parapsidal line marked with broad impressed area; median mesoscutal line absent; parascutal carina broad, reaching notaulus. Mesoscutellum rounded, 1.3× as broad as long; disk of mesoscutellum alutaceous, dull rugose laterally and posteriorly, slightly overhanging metanotum, with sparse long setae; circumscutellar carina complete. Mesoscutellar foveae transverse, about 2.0× as broad as high, smooth, glabrous, divided by a narrow reticulated elevated central carina. Mesopleuron striato-reticulate, speculum alutaceous; mesopleural triangle smooth, with a few irregular striae and long white setae; dorsal and lateral axillar areas smooth, glabrous; axillula with delicate parallel longitudinal striae; subaxillular bar smooth, glabrous, with parallel sides, posteriorly as high as height of metanotal trough; metapleural sulcus reaching mesopleuron at half of its height; upper part of sulcus also distinct, delimiting very broad smooth, glabrous area; lower delimited part smooth, with dense long white setae. Metascutellum smooth, glabrous, higher than height of smooth, glabrous ventral impressed area; metanotal trough smooth, glabrous; central propodeal area smooth to faintly rugate, glabrous, with parallel rugae in posterior half; lateral propodeal carinae distinct, curved outwards; lateral propodeal area smooth, with sparse long white setae, with rounded bump at the base of each seta. Nucha with numerous sulci dorsally and laterally. Tarsal claws with basal lobe.

Fore wing longer than body, hyaline, with distinct dense cilia on margin, veins pale brown, radial cell open, 3.4× as long as broad; Rs nearly reaching wing margin, R1 short, extending to 2/3 of vein projection to wing margin; areolet triangular, closed and indistinct. Rs+M inconspicuous, its projection reaching basalis in the lower 1/3 of its height.

Metasoma as long as head+mesosoma, slightly longer than high in lateral view; second metasomal tergum extending to 2/3 of length of metasoma in dorsal view, with sparse white setae anterolaterally extending to half-length of tergum 2, without micropunctures; all subsequent terga with micropunctures. Hypopygium with micropunctures, prominent part of ventral spine of hypopygium 2.0× as long as broad in ventral view. Body length 1.7–2.1 mm (n = 3).

Gall ( Fig. 68 ). Brown fluffy gall on the midrib on the underside of leaves, cluster of a few cells.

Biology. Only the asexual generation is known, which induces woolly leaf galls on Q. oleoides (Section Virentes ). Galls mature in April; adults emerged shortly afterwards under laboratory conditions.

Distribution. Costa Rica: Guanacas, Parque Nacional Santa Rosa.

Figures

FIGURES 57–61. Druon hansoni, sp. nov., asexual female. 57–60, head: 57, frontal view, 58, posterior view, 59, lateral view, 60, dorsal view. 61, antenna.

FIGURES 62–65. Druon hansoni, sp. nov., asexual female. 62, mesosoma, lateral view. 63, mesoscutum and mesoscutellum, dorsal view. 64, mesoscutellum, dorsal view. 65, metascutellum and propodeum, posterodorsal view.

FIGURES 66–68. Druon hansoni, sp. nov., asexual female. 66, fore wing, 67, metasoma, lateral view. 68, galls.

FIGURES 164–169. Druon quercuslanigerum var. fuscum, comb. nov., asexual female (Texas). 164–167, head: 164, frontal view, 165, dorsal view, 166, lateral view, 167, posterior view. 168, antenna. 169, mesosoma and propleura, frontal view.