Dirrhinodryinus, Martins & Melo, 2024

Martins, André L. & Melo, Gabriel A. R., 2024, Phylogenetic analysis of Neotropical Dryinus using morphological characters: new proposed classification for species groups and description of a new genus (Hymenoptera: Dryinidae), Zoological Journal of the Linnean Society 202 (3), pp. 1-23 : 9-11

Dirrhinodryinus gen nov.

Type species: Alphadryinus lamellatus Olmi, 1984 , comb. nov..

Included species: Dirrhinodryinus lamellatus ( Olmi, 1984) , comb. nov.; Dirrhinodryinus caraibicus ( Olmi, 1984) , comb. nov..

( Figs 5–7 )

Diagnosis: Head transverse, vertex level with upper summit of compound eyes in frontal view; flagellomeres 3–7 with two sets of separate grooves of rhinaria each; apical margin of clypeus convex; maxillary and labial palpomeres formula 6: 3; occipital carina complete or incomplete, extending dorsally on vertex, behind the ocelli; frontal line incomplete, almost reaching clypeus. Forewing with two dark transverse bands; stigmal vein of forewing with 3Rs&4Rs longer than 2r-rs; posterior surface of propodeum with two longitudinal carinae; claws of middle and posterior legs slender, gently curved, and accompanied by a long bristle; rudimentary claw longer than arolium.

Description: Head transverse ( Fig. 5C ), vertex straight in frontal view, level with upper summit of compound eyes ( Figs 5B , 6B ); TL surface absent; occipital carina complete or incomplete, restricted to the vertex, behind the ocelli; eye with or without dense pilosity; flagellomeres 3–7 with two sets of separate grooves of rhinaria each, flagellomere 8 variable, with two or three sets; frontal line incomplete ( Figs 5C , 6C ); apical margin of clypeus ( Figs 5B , 6B ) convex; mandible with four teeth, 2nd and 3rd subapical teeth subequal in size; maxillary and labial palpomeres formula 6: 3. Pronotum crossed by strong transverse impression at its central portion ( Figs 5A, E , 6A, E ); notauli percurrent ( Figs 5D , 3F ) or not percurrent ( Figs 6D , 3E ), when percurrent converging posteriorly; acetabular carina present or absent; anterior surface of mesoscutellum with one groove straight, and deep groove, or with two large groove on anterior surface. Forewing with two dark transverse bands ( Figs 5A , 6A ); stigmal vein of forewing with 3Rs&4Rs longer than 2r-rs; vein M and Cu diverging apically to cu-a. The 2nd and 3rd protarsomeres produced in hooks; enlarged claw of chela with one row of bristles, with or without one long lamella in central region; apex of enlarged claw with or without subapical tooth; claws of the middle and posterior legs slender, gently curved, and accompanied by a long bristle; tibial spur formula variable, 1/1/2 or 1/0/2. Posterior surface of propodeum with two longitudinal and one transversal carinae.

Etymology: The genus is named after the two sets of rhinaria.

Key for the species of Dirrhinodryinus gen. nov.

1. Frontal line complete ( Fig. 6B, C ); eye glabrous ( Fig. 6B, C ); occipital carina incomplete, restricted to the vertex ( Fig. 6C ), behind the ocelli; mandible base shorter than malar space; 1st flagellomere 3.2× longer than 2nd one ( Fig. 6C ); 8th flagellomere with two separate sets of rhinaria at the base and a single set apically; enlarged claw with one subapical tooth, and one row of six bristles ( Fig. 3A ); mid-tibia with one spur............................. Dirrhinodryinus caraibicus (Olmi) comb. nov.

– Frontal line incomplete ( Fig. 5B, C ); eye with dense short pilosity ( Fig. 5B, C ); occipital carina complete ( Fig. 5C ); mandible base longer than malar space; 1st flagellomere 1.8× longer than 2nd one; rhinaria on 8th flagellomere not differing from those on basal flagellomeres; enlarged claw of chela without subapical tooth, with one row of four bristles and one long lamellae ( Fig. 3B ); mid-tibial spur absent ............................................................... Dirrhinodryinus lamellatus (Olmi) comb. nov.

Figures

Figure 3. Electromicrography of Dirrhinodryinus species. A, chela of D.caraibicus; B, chela of D.lamellatus; C, middle leg of D. caraibicus; D, middle leg of D.lamellatus; E, mesosoma of D. caraibicus, dorsal view; F, mesosoma of D. lamellatus, dorsal view. Scale bar. A, B, E, and F 200 µm; C and D, 100 µm.

Figure 5. Dirrhinodryinus lamellatus (Olmi, 1984) comb. nov.. A, habitus, lateral view; B, head, frontal view; C, head, dorsal view; D, mesosoma, dorsal view; E, mesosoma, lateral view; F, propodeum, posterior view. Scale bar: A, 1.0 mm; B, C, 1.0 mm; D, E, 1.0 mm; F, 0.5 mm.

Figure 6. Dirrhinodryinus caraibicus (Olmi 1984) comb. nov.. A, habitus, lateral view; B, head, frontal view; C, head, dorsal view; D, mesosoma, dorsal view; E, mesosoma lateral view; F, chela. Scale bar. Scale bar: A, 1.0 mm; B, C, 1.0 mm; D, E, 1.0 mm; F, 0.5 mm.

Figure 7. Type species of Dirrhinodryinus. A, habitus of D.caraibicus& lateral view; B, labels of D. caraibicus; C, habitus of D. lamellatus, lateral view; D, labels of D. lamellatus. Scale bar.C, 1 mm.