Burnettweldia plumbella ( Kinsey, 1920 ) Melika & Pujade-Villar & Nicholls & Cuesta-Porta & Stone, 2021

Melika, George, Pujade-Villar, Juli, Nicholls, James A., Cuesta-Porta, Victor & Stone, Graham N., 2021, Three new Nearctic genera of oak cynipid gall wasps (Hymenoptera: Cynipidae: Cynipini): Burnettweldia Pujade-Villar, Melika & Nicholls, Nichollsiella Melika, Pujade-Villar & Stone, Disholandricus Melika, Pujade-Villar & Nicholls; and re-establishment of the genus Paracraspis Weld, Zootaxa 4993 (1), pp. 1-81 : 25-28

Burnettweldia plumbella ( Kinsey, 1920) , comb. nov.

Figs 65–76 , 94–95

Disholcaspis plumbella Kinsey 1920: 314 , female, gall.

Disholcaspis plumbella (Kinsey) : Weld 1951: 639.

Adleria pumbella (Kinsey) : Weld 1952: 300.

Disholcaspis plumbella (Kinsey) : Burks 1979: 1092.

Type examined. Kinsey’s original description mentioned that the holotype female and three gall cotypes are at the Museum of Comparative Zoology and in the author’s collection. GM examined the Kinsey collection at the AMNH, New York City, but found no specimens of D. plumbella . Specimens deposited at the Museum of Comparative Zoology were not examined and the type is not there (M. Buffington, personal communication) .

Material examined. One female „ USA, California, Round Valley, Code 1188; coll. 2003.10.10. leg. J. DeMartini ”. The specimen is deposited in the collection of PHDNRL. One female „Alpine, Calif.”, “ Q.dumosae ”,:1639”, Weld handwriting label “ Adleria plumbella (Kinsey) ”. Specimen USNMENT-00960551 examined by CMcE .

Diagnosis. Most closely resembles B. conalis , see Diagnosis to B. conalis above.

Description. Asexual female ( Figs 65–76 ). Head, mesosoma, metasoma, mandibles, mouthparts, antennae, legs uniformly reddish brown; head with black small area around ocelli.

Head reticulate, with dense white setae, less dense on frons, 2.1x as broad as long in dorsal view; 1.2x as broad as high and slightly narrower than mesosoma in frontal view. Gena reticulate, broadened behind eye in frontal view, slightly broader than transverse diameter of eye in lateral view. Malar space reticulate, without striae and sulcus; eye 2.4x as high as length of malar space. Inner margins of eyes parallel. POL 1.8x as long as OOL; OOL 2.2x as long as diameter of lateral ocellus, 1.4x as long as LOL; ocelli ovate, all equal in size. Transfacial distance 1.2x as long as height of eye and 1.5x as long as height of lower face (distance between antennal rim and ventral margin of clypeus); toruli level with the upper half of compound eye; diameter of antennal torulus 1.6x as long as distance between them, distance between torulus and eye margin slightly greater than diameter of torulus. Lower face reticulate, without striae, with elevated median reticulate area, with dense setae. Clypeus trapezoid, flat, broader than high, smooth, glabrous, with deep anterior tentorial pits, deep epistomal sulcus and deep clypeo-pleurostomal line; ventrally rounded, emarginate, not incised medially. Frons and interocellar area reticulate; small impressed triangular area under central ocellus reticulate. Vertex, occiput uniformly reticulate. Postgena smooth, glabrous, with sparse white setae; postocciput smooth, glabrous, impressed around occipital foramen; posterior tentorial pits large, deep, elongate; oral foramen half the height of postgenal bridge+occipital foramen; occipital foramen shorter than height of postgenal bridge; hypostomal carina emarginate, continuing into postgenal sulci which are parallel in ventral 1/3 and bent outwards in dorsal 2/3; postgenal bridge smooth, glabrous, anteriorly diverging, as broad as width of occipital foramen. Antenna longer than head+mesosoma, with 12 flagellomeres (in some specimens indistinct suture present on F12 and thus antenna is 13 segmented), pedicel slightly longer than broad, F1 1.9x as long as scape+pedicel, 1.2x as long as F2, F2 1.3x as long as F3, F3 slightly longer than F4, F5 longer than F6, F6 to F11 nearly equal in length, F12 1.9x as long as F11; placodeal sensilla on F5–F12.

Mesosoma as long as high in lateral view. Pronotum delicately coriaceous, with dense white setae and piliferous points, without striae laterally, emarginate, foveolate along lateral edge; propleuron alutaceous, with sparse white setae. Mesoscutum uniformly reticulate, with dense white setae; nearly as long as broad (width measured across base of tegulae). Notaulus incomplete, extending to half the length of mesoscutum or slightly shorter; broadest at most posterior end and gradually narrowing until anterior end, with smooth, glabrous bottom. Anterior parallel line indicated by broad smooth, glabrous stripe, extending to slightly more than half the length of mesoscutum. Parapsidal line slightly impressed, indicated by smooth, glabrous broad stripe, extending to half length of mesoscutum, reaching above tegula; parascutal carina narrow, deep, smooth, glabrous, reaching pronotum. Median mesoscutal line distinct, impressed, extending to 1/6 of mesoscutum length. Transscutal articulation deep, distinct. Mesoscutellum nearly as long as broad, shorter than mesoscutum, disk uniformly coriaceous, with dense white setae, trapezoid; broadest part in the posterior 2/3; carinated laterally and posteriorly, slightly overhanging metanotum; mesoscutellar foveae in the form of a semi-lunar transverse depression, 2.0x as broad as high, with smooth, glabrous bottom, not divided by central carina. Mesopleuron uniformly reticulate, with dense white setae; mesopleural triangle coriaceous, with dense white setae. Metapleural sulcus reaching mesopleuron slightly below half of its height, lower part of sulcus delimiting broad densely setose area, upper part of sulcus distinct; dorsal and lateral axillar areas coriaceous, with dense setae; axillar carina broad, with longitudinal striae; subaxillular bar triangular, smooth, glabrous, at most posterior end higher than height of metanotal trough. Metascutellum reticulate, narrower than height of smooth, glabrous ventral impressed area; metanotal trough smooth, shining, with sparse white setae. Lateral propodeal carinae distinct only in posterior 1/3 of propodeum height; central propodeal area smooth, glabrous, darker than rest of propodeum, bent outwards in posterior third, well-delimited in the part where lateral propodeal carina absent, without wrinkles or setae; with distinct longitudinal central carina going from anterior edge to half length of propodeum, area under carina is smooth, glabrous; lateral propodeal area smooth, with dense white setae; nucha short, smooth and glabrous dorsally, with delicate sulci laterally. Tarsal claws with acute basal lobe.

Forewing longer than body, with distinct brown veins, margin with dense short cilia; radial cell opened, 3.2x as long as broad, R1 and Rs not reaching wing margin; areolet triangular, well-delimited by distinct veins; Rs+M distinct, reaching basalis slightly below mid-height.

Metasoma longer than head+mesosoma, longer than high in lateral view, smooth, glabrous, with dense setae; second metasomal tergum extending to 4/5 of metasoma length in dorsal view, smooth, glabrous dorsally; dorsally with micropunctures, laterally micropunctures to half length of tergum, with dense white setae and piliferous points; all subsequent terga and hypopygium uniformly micropunctured, with dense white setae; prominent part of ventral spine of hypopygium short, as broad as long, with parallel sides; with dense long white setae, reaching far beyond apex of spine and forming a tuft. Body length 4.2–4.4 mm (n = 2).

Gall. ( Figs 94–95 ). Detachable monolocular bud or stem gall, occuring singly or in clusters on young stems, with a long curved pointed beak at the apex. Two colour forms: (i) greenish with round yellow spots, and (ii) deep wine red with bright yellow spots. The main body of the gall 10–15 mm in diameter, apical projection around 2 mm. The larval chamber is spherical, located centrally ( Burnett 1977, Russo 2006).

Biology. Galls appear in May, fully grown in August, mature in September and early October; adults emerge in November-December. Overwinters in the egg stage. Galls on Q. berberidifolia , Q. douglasii , Q. dumosa ( Burks 1979) . Distribution. USA: California ( Burks 1979); Mexico: Baja California ( Burnett 1977).

Figures

FIGURES 65–70. Burnettweldia plumbella, comb. nov., asexual female. 65–68, head: 65, frontal view, 66, dorsal view, 67, lateral view, 68, posterior view. 69, antenna. 70, mesosoma and propleura, frontal view.

FIGURES 71–74. Burnettweldia plumbella, comb. nov., asexual female. 71, mesosoma, lateral view. 72, mesoscutum, dorsal view. 73, mesoscutellum, dorsal view. 74, metascutellum and propodeum, posterodorsal view.

FIGURES 75–76. Burnettweldia plumbella, comb. nov., asexual female. 75–76, metasoma: 75, lateral view, 76, ventral view.

FIGURES 89–96. Burnettweldia asexual galls. 89–91, B. californicordazi, sp. nov.. 92, B. conalis, comb. nov.. 93, B. corallina, comb. nov.. 94–95, B. plumbella, comb. nov.. 96, B. washingtonensis, comb. nov.. Fig 95 courtesy of J. Gross.