Gonatopus jacki, Guglielmino, Adalgisa, Olmi, Massimo, Marletta, Alessandro & Speranza, Stefano, 2018

Guglielmino, Adalgisa, Olmi, Massimo, Marletta, Alessandro & Speranza, Stefano, 2018, A new species of the genus Gonatopus Ljungh from the USA (Hymenoptera, Dryinidae), ZooKeys 747, pp. 63-69 : 65-67

Gonatopus jacki sp. n.

Diagnosis.

Female apterous (Fig. 1A, B); palpal formula 5/2; pronotum crossed by deep transverse furrow (Fig. 1B); mesoscutum without lateral pointed apophyses (Fig. 1A); metanotum not hollow behind mesoscutellum (Fig. 1B); meso-metapleural suture obsolete; first abdominal tergum strongly transversely striate (Fig. 1A); enlarged claw with peg-like hairs and one small subapical tooth (Fig. 2A).

Description.

Female. Apterous (Fig. 1A, B); length 3.4 mm. Head brown, except mandible, clypeus, region of face between antennal toruli and two short frontal stripes along orbits yellow-whitish; antenna brown, except antennomere 10 whitish; mesosoma and metasoma black; legs brown, except metatrochanter testaceous. Antenna clavate; antennomeres in following proportions: 9:6:14:10:10:9:8:8:7:10. Head excavated, shiny, not sculptured; frontal line complete; occipital carina absent; POL = 1; OL = 2; OOL = 8; greatest breadth of posterior ocellus about as long as POL. Palpal formula 5/2. Mesosoma with long sparse setae. Pronotum shiny, unsculptured, crossed by deep transverse impression. Mesoscutum slender (Fig. 1A), dull, granulated, laterally without pointed apophyses (Fig. 1A). Mesoscutellum very small, flat, not sculptured. Metanotum flat, transversely striate, not hollow behind mesoscutellum (Fig. 1B). Metapectal-propodeal complex shiny, with metapostonotum not sculptured; first abdominal tergum transversely striate. Mesopleuron and metapleuron granulated and transversely striate. Meso-metapleural suture obsolete. Protarsomeres in following proportions: 13:2:4:17:26. Protarsomere III produced into hook. Enlarged claw (Fig. 2A) with one small subapical tooth and nine peg-like hairs + one bristle. Protarsomere V (Fig. 2A) with two rows of 4 + 22 lamellae situated in distal half; distal apex with approximately eleven lamellae. Tibial spurs 1/0/1.

Male. Unknown.

Material examined.

Holotype: a female from the USA, Florida, Sarasota Co., Turtle Beach, 27.217°N 82.517°W ± 2 km, 5 m, 30.xii.1989, beach margin, No 2601-S, John T. Longino leg. (MOLC).

Distribution.

USA.

Hosts.

Unknown.

Etymology.

The species is named after the collector, John T. (Jack) Longino.

Remarks.

The new species is similar to G. ashmeadi Kieffer in Kieffer & Marshall, 1905 and G. agropyrus Fenton, 1921, by having head mostly brown, labial palpus bi-segmented, mesoscum with no lateral pointed apophyses, meso-metapleural suture obsolete, first abdominal tergum transversely striate, protarsomere I shorter than IV, protarsomere V with lamellae situated in distal half. The main difference among G. jacki and the other two species is in the mesoscutum shape: very slender in G. jacki (Fig. 1A); broader in G. ashmeadi (Fig. 1C) and G. agropyrus (Fig. 1E). The comparison of the holotypes of the above three species shows also a difference regarding the colour: mostly black in G. jacki (Fig. 1A, B), yellow-testaceous in G. agropyrus (Fig. 1E) and testaceous-ferruginous in G. ashmeadi (Fig. 1C, D). However, these differences are not significant, because the colour can be very variable, so that mostly black specimens are known in both G. agropyrus and G. ashmeadi . Following the description of G. jacki , the key to the females of the Nearctic species of Gonatopus group 7 published by Olmi (1993b) can be modified by replacing couplet 14 as follows: