Orasema lasallei, Cameron, 1884

Heraty, John M. & Baker, Austin J., 2020, New species of Orasema (Hymenoptera: Eucharitidae) from Central and South America, Journal of Natural History 54 (9), pp. 735-754: 737

publication ID

http://doi.org/ 10.1080/00222933.2020.1747651

persistent identifier

http://treatment.plazi.org/id/03E5B946-A022-4620-FF30-63E7FB3CAAD1

treatment provided by

Carolina

scientific name

Orasema lasallei
status

 

Orasema lasallei  species group

Diagnosis

Recognised from all other species of Orasema  by having a combination of 8 funiculars in males and females ( Figure 2View Figure 2), the labrum with 4 – 12 digits (usually>6), mesothorax dorsally scabrous or coarse rugose, fore wing with a setose costal cell, speculum bare, and basal third of hind wing with scattered microsetae, otherwise pilose. Other features include the yellow scape, yellowish-brown mandibles with a darker brown margin, propodeal callus with 2 – 3 minute setae, wings hyaline, postmarginal vein not more than 2.3× as long as stigmal vein, fore wing with basal area bare, petiole cylindrical and rugose, lateral margins of petiole rounded (not carinate), 2.1 – 3.8× as long as broad in females, 8.3 – 10× as long as broad in males, and smooth antecostal sulcus.

Key

In the Burks et al. (2018) species group key, this species group keys to ‘ [undescribed set of Neotropical species] ’ in the Orasema festiva  couplet with more than 6 digits, although we now recognise that some specimens have as few as 4 digits. All festiva  group species have a lateral carina on the petiole, which is absent in the lasallei  group.

Diversity

We recognise four species in the group, Orasema janzeni  ( Costa Rica and Nicaragua), O. lasallei  ( Costa Rica, Honduras, Mexico, Nicaragua), O. peckorum  ( Brazil), and O. vasquezi  ( Colombia).

Biology. Orasema lasallei  was taken from a nest of Pheidole vorax (Fabr.)  (Myrmicinae).

Key to species of the O. lasallei  species group

1. Frons vertically costate, lower face mostly smooth ( Figure 3aView Figure 3, 4eView Figure 4); labrum with 6 – 12 digits ( Figure 3a,bView Figure 3) ................................................................................................................................... 2

Frons rugulose or reticulate, lower face with some sculpture ( Figure 3fView Figure 3); labrum with 4 – 8 digits ( Figure 3 fView Figure 3).............................................................................................................................. 3

2. Hind femur yellow ( Figure 3c, dView Figure 3)............................ ............................ Orasema lasallei  sp. nov.

Hind femur dark brown medially ( Figure 4dView Figure 4) ............................ Orasema vasquezi  sp. nov.

3. Labrum with 8 (♀) or 6 (♂) digits; frons rugulose-reticulate; basal area of speculum bare; postmarginal vein 2.2× as long as stigmal vein .................... Orasema peckorum  sp. nov.

Labrum with 4 – 6 digits; frons finely reticulate; basal area of speculum closed by broad band of setae; postmarginal vein 1.4 – 2.2× as long as stigmal vein.......................................... .......................................................................................................................... Orasema janzeni  sp. nov.