Chaenusa (Chaenusa) anervata van Achterberg, 2012

Noort, Simon van, Smith, Rosali & Coetzee, Julie A., 2021, Identity of parasitoid wasps (Hymenoptera, Braconidae and Eulophidae) reared from aquatic leaf-mining flies (Diptera, Ephydridae) on invasive Brazilian waterweed Egeria densa in South Africa, African Invertebrates 62 (1), pp. 287-314: 287

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Chaenusa (Chaenusa) anervata van Achterberg, 2012


Chaenusa (Chaenusa) anervata van Achterberg, 2012   Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4


South Africa • female; Mpumalanga Prov., Lydenburg Fisheries, Lydenburg ; 25°11'S, 30°48'E; 21.xi.2008; J.R. Baars, J.A. Coetzee, G.D. Martin; ex leaf-miner on Lagarosiphon major   Hydrocharitaceae  ( SANC examined). GoogleMaps  


South Africa • 1 female; KwaZulu-Natal Prov., Mooi River, Mearns Dam ; 29°25'S, 29°97'E; 18.xi.2008; J.R. Baars, J.A. Coetzee, G.D. Martin; ex leaf-miner on Lagarosiphon major   Hydrocharitaceae  ( RMNH not seen)   1 male: Underberg, Farm Dam on Bushman's Nek road; 30°27'S, 29°14'E; 16.xi.2008 ( SANC examined) GoogleMaps   1 male; Mooi River, Mearns Weir , 29°15'S, 29°57'E, 17.xi.2008 ( RMNH not seen) GoogleMaps   .

Other material.

South Africa • 1 male; KwaZulu-Natal, Midmar Dam , 29°32'21.35"S, 30°11'40.15"E, June 2019, R. Smith, Collected from Egeria densa   infestation with Hydrellia egeriae   pupae, reared in lab, MDMR-FOR-R05, SAM-HYM-P092803 ( SAMC) GoogleMaps   .


Parasitoid of aquatic leaf-mining flies ( Ephydridae   ): Hydrellia lagarosiphon   on Lagarosiphon major   ( Hydrocharitaceae  ) and Hydrellia egeriae   on Egeria densa   ( Hydrocharitaceae  ).


South Africa.


According to van Achterberg and Prinsloo (2012), this species is similar to Chaenusa glabra   Kula, 2009 ( India, Pakistan), which has a two-segmented labial palp (three-segmented in C. anervata   and C. seminervata   ), females with 12-14 antennal segments (at least 15 in C. anervata   and 16-18 in C. seminervata   ) and males with 14-17 segments (22 in C. anervata   and 17-24 in C. seminervata   ). The body is brown or brownish-yellow as opposed to black in C. anervata   and C. seminervata   (van Achterberg and Prinsloo 2012). Other sexually dimorphic characters in C. anervata   encompass the forewing pterostigma, which is light brown in females and dark brown in males; the male first metasomal tergite is generally longer (1.1-1.3 times its apical width) than in the female (1.1 times apical width) (van Achterberg and Prinsloo 2012); in addition, the compound eyes in females converge far more strongly (narrowest ventral width of face 0.55 × broadest dorsal width) towards the clypeus than in the males (narrowest ventral width of face 0.90 × broadest dorsal width); however, the overall relative dimensions of the face relative to the broadest width just below the toruli are equivalent in the two sexes, being slightly wider than high (females H:W = 9:10; males H:W = 10:11).


Agricultural Research Council-Plant Protection Research Institute


National Museum of Natural History, Naturalis


Iziko Museums of Cape Town