Gatesina Pujade-Villar, Cuesta-Porta & Hanson

Cuesta-Porta, Víctor, Caicedo, Guadalupe, Hanson, Paul & Pujade-Villar, Juli, 2018, Gatesina colombiana n. gen. & n. sp. (Hymenoptera: Chalcidoidea, Eurytomidae), new Rileyinae associated with Myrcianthes (Myrtaceae) from Colombia, Zootaxa 4471 (1), pp. 111-124: 114-115

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Gatesina Pujade-Villar, Cuesta-Porta & Hanson

n. gen.

Gatesina Pujade-Villar, Cuesta-Porta & Hanson  n. gen.

Type species. Gatesina colombiana  n. sp., monotypic.

Diagnosis. Females of Gatesina differ from those of other genera of Rileyinae  in the morphology of the metasoma, which is laterally compressed, with the posterior part bent dorsally upwards, and with gastral tergites 6‒8 and the ovipositor perpendicular to the longitudinal axis of the body ( Figs 17, 19, 20View FIGURES 13–22). Other Rileyinae  usually do not have the metasoma bent like this and never to such an extent. Five other characteristics different from most other Rileyinae  ( Lotfalizadeh 2007; Gates 2008; Caicedo & Pujade-Villar 2017) are: (i) epicnemium with smooth ovate depression with sparse long setae and bordered by a faint carina ( Fig. 12View FIGURES 1–12) (other Rileyinae  usually have longitudinal glabrous sulci, but never this structure); (ii) prosternum with mesal, laminate and setose projection on ventral side ( Fig. 12View FIGURES 1–12); (iii) distance between toruli less than their diameter ( Figs 1, 2View FIGURES 1–12) (in other Rileyinae  the distance between toruli is usually greater than their diameter, except some Rileya Ashmead 1888); (iv) postgenal bridge slightly concave and not carinately margined ( Figs 4, 5View FIGURES 1–12) (usually delimited by a strong depression or carina in other Rileyinae  ); (v) propodeal spiracles round (in other Rileyinae  usually elongate and transversely or obliquely oriented). The new genus is morphologically similar to Neorileya Ashmead 1904  , but differs, in besides the aforementioned characters, the following four features: (i) clypeus with 6 sparse setae that surpass the ventral clypeal margin and without a carina reaching intertorular space ( Figs 1‒3View FIGURES 1–12) (glabrous in Neorileya  except for two setae on each lateral margin of clypeus and with medial carina reaching intertorular space), (ii) frons finely strigose ( Figs. 1, 2View FIGURES 1–12) (coarsely reticulate to umbilicate in Neorileya  ), (iii) lower margin of eye midway between toruli and clypeus ( Figs 1, 2View FIGURES 1–12) (nearly at clypeal level in Neorileya  ), and (iv) with a faint, oblique carina connecting metacoxa and nucha, but transverse carina connecting metacoxae absent ( Fig. 10View FIGURES 1–12) ( Neorileya  with oblique metacoxal-nuchal carina absent, but inter-metacoxal transverse carina present). Moreover, a mesepimeral-metapleural junction is present, with a tongue visible but not overlapping the metapleuron ( Fig. 13View FIGURES 13–22) (absent from Neorileya  ; present in Platyrileya Burks 1971  and Rileya, but tongue overlapping metapleuron in Rileya).

Etymology. This genus is named in honor of Michael W. Gates (Smithsonian Institution, Washington, USA) for all his work and contribution to hymenopteran research, especially to the Rileyinae  and the family Eurytomidae  as a whole.

Gender. Feminine.

Biology. Parasitoid of gall-inducing Eurytominae  in Myrcianthes ( Myrtaceae  ) fruits. Two possible hosts known so far: Sycophila  n. sp. and Eurytoma  n. sp. Both phytophagous species attack on Myrcianthes fruits and can coexist in the same gall. Eurytoma  larvae chamber substitutes the fruit’s seeds. Sycophila  larvae chamber is placed in the hyperplasic mesocarp near the limit with exocarp. Gatesina has always been found in external chambers similar to Sycophila  . Caicedo & Pujade-Villar (2017) also found correlation between Sycophila  and Gatesina emergence of the adults. Sycophila  is very likely to be parasitized by Gatesina, but Eurytoma  or other hosts are not discarded.

Distribution. Colombia.