Krokella, Huber, 1993

Huber, John T., Read, Jennifer D. & Triapitsyn, Serguei V., 2020, Illustrated key to genera and catalogue of Mymaridae (Hymenoptera) in America north of Mexico, Zootaxa 4773 (3), pp. 1-411 : 201-202

KROKELLA Huber, 1993

( Figs 500–518 )

Krokella Huber, 1993: 349 . Type species: Krokella fera Huber, 1993 , by original designation.

Diagnosis. Body length 385–485 μm. Face without subantennal sulci ( Fig. 501 , 513 ); clava 3-segmented ( Figs 500 , 504 ); mandible a minute stub without teeth ( Figs 501 , 513 ); ocular apodeme apparently absent but ocular ridge with anterior margin greatly thickened ( Fig. 503b ); frenum divided medially by longitudinal sulcus ( Figs 511 , 515 ); fore wing with venation extending more than half wing length. Male with mandible enormous, crocodile-like ( Figs 508 , 518 ); flagellum 9-segmented ( Fig. 509 ).

Discussion. Only two other Nearctic genera, Neostethynium and Stethynium , have the clava 3-segmented. Krokella differs from both by having the fore wing venation extending more than half the wing length. It is similar to Neostethynium based on the very similar male mandible, and to Stethynium based on the longitudinally divided frenum.

Important reference. Huber (1993).

Figures

FIGURE 500. Krokella fera Huber, male paratype, habitus. USA, Florida, Dade Co., Everglades National Park, Long Pine Key, 31.viii–9.xii.1986, S. & J. Peck, pineland forest. Scale bar=500 μm.

FIGURES 501–504. Krokella sp. 501, head, anterior; 502, head, posterior; 503a, head, lateral; 503b, head lateral (internal) showing ocular apodeme (as anteriorly thick ocular ridge); 504, antenna. Scale bars=100 μm.

FIGURES 505, 506. Krokella sp. 505, mesosoma, lateral; 506, metasoma, lateral showing genitalia. Scale bars=100 μm.

FIGURES 507–510. Krokella fera Huber, male. 507, head, dorsal; 508, head, ventral; 509, antenna; 510, wings. Scale bars: 507, 508=100 μm; 509, 510=200 μm.

FIGURES 511, 512. Krokella fera Huber, male. 511, mesosoma, dorsal; 512, metasoma, dorsal, showing genitalia. Scale bars=100 μm.

FIGURES 513–518. Krokella sp., female except 518. 513, head, anterior; 514, mesosoma, dorsal; 515, scutellum–propodeum; 516, metasoma, dorsal; 517, apex of gaster, dorsal; 518, male, lower face + mouthparts, anterior. Scale bars: 513–515, 517=20 μm; 516=50 μm; 518=5 μm.