Chaenusa (Chaenusa) seminervata 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

publication ID

http://dx.doi.org/10.3897/afrinvertebr.62.62842

publication LSID

lsid:zoobank.org:pub:DD1C3651-0E8A-4F50-8D66-32474969C0F3

persistent identifier

http://treatment.plazi.org/id/0B533089-9C0F-53EC-AA62-2A328A955FB6

treatment provided by

African Invertebrates by Pensoft

scientific name

Chaenusa (Chaenusa) seminervata van Achterberg, 2012
status

 

Chaenusa (Chaenusa) seminervata van Achterberg, 2012   Figs 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 , 9 View Figure 9

Holotype.

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  

Paratypes.

South Africa • 1 female; Mpumalanga Prov., Belfast, Lakenvlei Wetland ; 25°60'S, 30°05'E ( RMNH not seen) GoogleMaps   1 male; KwaZulu-Natal Prov., Stillwater Dam, Rosetta ; 29°30'S, 29°97'E; 17.xi.2008; J.R. Baars, J.A. Coetzee, G.D. Martin; ex leaf-miner on Lagarosiphon major   Hydrocharitaceae  ( RMNH not seen)   4 males; Dieu Donne Farm Dam, Sani Pass ; 29°68'407"S, 29°48'949"E; 16.xi.2008; J.R. Baars, J.A. Coetzee, G.D. Martin; reared from leaf-miner on Lagarosiphon major   ( Hydrocharitaceae  ) ( SANC examined, RMNH not seen)   .

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-R01, SAM-HYM-P092800 ( SAMC) GoogleMaps   1 female, idem, except MDMR-FOR-R02, SAM-HYM-P092801 ( SAMC) GoogleMaps   1 male, idem, except MDMR-FOR-R04, SAM-HYM-P092802 ( SAMC) GoogleMaps   1 male, idem, except MDMR-FOR-R09, SAM-HYM-P092804 ( SAMC) GoogleMaps   1 male, idem, except MDMR-FOR-R10, SAM-HYM-P092805 ( SAMC) GoogleMaps   1 male, idem, except MDMR-FOR-R14, SAM-HYM-P092806 ( SAMC) GoogleMaps   .

Biology.

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

Distribution.

South Africa.

Comments.

The Neotropical species Chaenusa aurantium   Kula & Martinez, 2009 was reared from an undescribed species of Hydrellia   in Argentina under evaluation for control of Egeria densa   in the United States ( Kula et al. 2009). Chaenusa seminervata   keys to C. aurantium   (terminal maxillary palpomere is brown) in the key to New World species ( Kula and Zolnerowich 2008; Kula et al. 2009), but it is distinct from C. aurantium   in head colour, sculpture and setation of the frons, as well as mesoscutal, mesopleural and propodeal sculpture. Sexual dimorphism of Chaenusa seminervata   is exhibited in the following characters: females with 16-18 antennal segments, males with 17-24 segments; the forewing pterostigma is light brown in females and dark brown in males; in addition, the compound eyes in females converge less strongly (narrowest ventral width of the face 0.75 × broadest dorsal width) towards the clypeus than in C. anervata   , but still more strongly than in males (narrowest ventral width of the face 0.81 × 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 = 10:12; males H:W = 9:11).

SANC

Agricultural Research Council-Plant Protection Research Institute

RMNH

National Museum of Natural History, Naturalis

SAMC

Iziko Museums of Cape Town

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Braconidae

Genus

Chaenusa