Orasema lasallei, 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

DOI

http://doi.org/10.5281/zenodo.4329782

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 2 View 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 3a View Figure 3 , 4e View Figure 4 ); labrum with 6 – 12 digits ( Figure 3a,b View Figure 3 ) ................................................................................................................................... 2

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

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

Hind femur dark brown medially ( Figure 4d View 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.