Gauldiana Khalaim & Ward

Khalaim, Andrey I. & Ward, Darren F., 2018, Tersilochinae (Hymenoptera: Ichneumonidae) from New Zealand. Part 1. Generic key and three new genera, Zootaxa 4425 (1), pp. 41-77: 66-67

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Gauldiana Khalaim & Ward

gen. nov.

Genus Gauldiana Khalaim & Ward  , gen. nov.

Type species: Zealochus postfurcalis Khalaim, 2006  .

Diagnosis. Small to moderate sized species with body length 2.3–5.0 mm and fore wing length 2.1–4.1 mm.

Head, mesosoma and first metasomal tergite (except apical edge of postpetiole) very evenly granulate and dull, impunctate; sometimes vertex and genae with granulation shallow, weakly shining. Head in dorsal view transverse, rounded behind eyes. Clypeus lenticular, usually with lower margin slightly truncated centrally, or in G. triangulata  subtriangular. Mandibles slender, with upper tooth clearly longer than the lower, in G. triangulata  distinctly twisted. Eye surface glabrous. Occipital carina complete. Hypostomal carina absent. Flagellum with 13–21 flagellomeres, in female usually clavate apically.

Mesosoma with notauli usually weak and short, or vestigial, or absent. Foveate groove absent. Propodeum with weak transverse carina, mediodorsally usually without carinae, with same evenly granulate structure as on dorsolateral sides, or rarely with a vestigial median carina; apical area distinctly elongate, 1.3–1.8× as long as maximally broad, suboval.

Fore wing with vein 2m-cu interstitial or postfurcal; vein 2m-cu always present, though widely unpigmented anteriorly. Hind wing with vein cu1&cu-a weakly to strongly reclivous. Legs slender; hind coxa of female with conspicuous ridge on ventral surface ( Fig. 107 View Figure , arrow).

Metasoma with first tergite in dorsal view weakly to moderately broadened posteriorly, usually subcylindrical, or G. triangulata  depressed. Glymma entirely absent. Thyridial depression very shallow, often indistinct, as long as broad or slightly elongate. Female with ovipositor slender for its entire length, weakly to strongly upcurved, often with apex conspicuously stronger upcurved than basal 0.8, with neither dorsal nodus nor subapical notch or depression, but with very fine teeth on apex of lower valve.

Comparison. Gauldiana  is readily distinguished from other New Zealand genera by the following unique features: ovipositor very slender for its entire length, without trace of a dorsal subapical notch or nodus ( Figs 92 View Figure , 97 View Figure , 103 View Figure ); apical area of propodeum very narrow, always elongate, suboval, less than half of propodeum maximum width ( Figs 91 View Figure , 96 View Figure , 102 View Figure , 107 View Figure ); hind coxa of female with a ventral longitudinal ridge ( Fig. 107 View Figure , arrow); and the first tergite entirely evenly granulate, without any vestiges of glymma ( Figs 98, 103 View Figure , 108 View Figure ).

The genus is also characterized by the following characters: flagellum in female usually clavate ( Figs 88 View Figure , 95 View Figure , 100, 101 View Figure , 104 View Figure ); notaulus absent (except G. triangulata  ); foveate groove of mesopleuron absent ( Figs 93 View Figure , 103 View Figure , 109 View Figure ); propodeum with only transverse carina, mediodorsally usually evenly granulate ( Figs 91 View Figure , 96 View Figure , 102 View Figure ), or rarely with a weak basal keel ( Fig. 107 View Figure ); head and mesosoma evenly granulate, impunctate. Species of the genus, excepting highly specialized G. triangulata  , are very uniform and are not easy to identify.

Etymology. Named in honour of the British entomologist Ian D. Gauld in recognition of his great contribution to the study of Ichneumonidae  of the world. This work is partially based on his preliminary identifications of New Zealand Tersilochinae  . Gender feminine.

Remarks. Gauldiana  is endemic to New Zealand where nine species are recognized; all except G. postfurcalis (Khalaim)  , comb. nov. are described here as new. Large numbers of individuals of G. triangulata  have been reared from the scolytid-infested wood of Pseudopanax simplex  ( Araliaceae  ) and another species, G. nigra  , was reared from the weevil Phorostichus linearis  ( Curculionidae  ) in Astelia trinervia  ( Asteliaceae  ).