Platyscelio arcuatus Taekul & Johnson

Taekul, Charuwat, Johnson, Norman F., Masner, Lubomir, Polaszek, Andrew & Rajmohana K.,, 2010, World species of the genus Platyscelio Kieffer (Hymenoptera: Platygastridae), ZooKeys 50, pp. 97-126 : 105

Platyscelio arcuatus Taekul & Johnson sp. n. Figures 13-18Morphbank30

Description. General:

Body length of male: 3.87 mm (n=1). Body length of female: 3.48-3.97 mm (n=3).

Head:

Length between anterior ocellus and posterior ocellar line in frontal view: greater than or equal to 0.5 times POL. Striae within ocellar triangle: sparse (equal to or less than 20). Vertex sculpture between inner orbit and posterior ocellus: smooth or with few faint striae. Frontal sculpture between inner orbit and central keel: smooth. Submedial ventral area of head anterior to fossa: longitudinally striate throughout. Orbital carina: absent. Sculpture of malar region: longitudinally striate or with few faint striae.

Antenna:

Color of female antenna: dark brown to black throughout. Female outer lateral apex of scape: sharply pointed. Claval shape: apical margin of A9-A11 concave, closely fitting basal margin of following antennomere. Color of male antenna: dark brown to black throughout.

Mesosoma:

Sculpture on medial lobe of mesoscutum: longitudinally striate. Setation of medial lobe of mesoscutum: sparse to glabrous. Notaulus: present. Notaulus form: mesal margin arched, lateral margin straight. Length of notaulus: percurrent or nearly so. Width of notaulus anteriorly: narrowed anteriorly. Pilosity of notaulus: present. Number of lateral carinae on mesoscutum: 0. Medial carina of mesoscutum: present. Parapsidal line: present. Posterior scutellar sulcus: interrupted medially or complete. Setation of posterior half of ventral metapleural area: sparse (less than 25 setae). Metascutellum size: narrow, metanotum lateral to metascutellum with 4-6 foveae. Sculpture on ventral metapleural area: longitudinally striate, coriaceous microsculpture within interstices or strongly reticulate rugose with foveolae. Median propodeal sulcus: narrow throughout length. Sculpture of submedian propodeal field: longitudinally striate, in male interstices with coriaceous microsculpture. Posterolateral margin of propodeum: reticulate rugose with foveolae throughout. Color of legs: coxae dark brown to black, otherwise yellow throughout.

Wings:

Postmarginal vein: reduced, stumplike. Fore wing: hyaline.

Metasoma:

Sculpture on T1: longitudinally striate, coriaceous microsculpture within interstices. Sublateral carina on T2-T4: present, percurrent. Sculpture on T2-T4: longitudinally striate with coriaceous microsculpture within interstices.

Diagnosis.

Platyscelio arcuatus may be separated from Platyscelio striga (also from Western Australia) by the less densely striate sculpture within the ocellar triangle (20 striae or fewer).

Etymology.

The epithet arcuatus, Latin for bent like a bow, refers to the shape of the notaulus.

Link to distribution map.

31

Material examined.

Holotype female: AUSTRALIA: Western Australia, Keystone Rd., 3 km W Walpole, 34°59.01'S 116°40.76'E, George, Hawks, Munro, YPT, OSUC 250635 (deposited in ANIC). Paratypes: AUSTRALIA: 3 females, 1 male, OSUC 250633-250636 (CNCI).