Dryinus alamellatus Olmi & Guglielmino

Olmi, Massimo, Guglielmino, Adalgisa & Vollaro, Massimo, 2011, Revision of fossil species of Dryinus belonging to constans group, with description of a new species (Hymenoptera: Dryinidae), Zootaxa 2981, pp. 43-55 : 45-50

Dryinus alamellatus Olmi & Guglielmino , sp. nov.

( Figs 1 , 2 A, 2B)

Type material. HOLOTYPE, Ƥ, Lower/Middle Miocene amber from Dominican Republic (ca. 16 mybp) ( SNMS).

Diagnosis. Female of Dryinus with pronotal tubercle reaching tegula, notauli incomplete and fore wing crossed by two dark transverse bands. Male unknown.

Description. Female: macropterous; length 9.1 mm. Colour black, except antenna and legs brown and palpi testaceous. Antenna 10-segmented, long and slender, weakly thickened distally; antennal hairs hardly distinct, much shorter than breadth of segments; antennal segments in following proportions: 8:6:30:14:12:8:8:6:6:7; antenna more than three times as long as head (length of head in dorsal view from occipital carina behind ocelli to distal apex of mandible): 99:27; antennal torulus touching margin of clypeus. Head with vertex and face apparently granulated; clypeus with ventral margin weakly bidentate; mandibles closed, with teeth not distinct; eye normally bulging, apparently bare; malar space with furrow joining lower corner of eye to base of mandible; occipital carina only clearly visible on dorsal side of head, laterally touching posterior corner of eyes, not visible on sides of head and on ventral side; POL = 3; OL = 4; OOL = 7; OPL = 1; TL = 0.5; frontal line complete. Maxillary palpi 6-segmented. Labial palpi 3-segmented; last labial palp segment very long and slender. Pronotum granulated and with numerous striae around disc and on lateral regions, slightly shorter than head (24:27), crossed by an anterior strong transverse impression and a posterior strong transverse furrow; disc humped; posterior collar very short, much shorter than anterior collar (1:9); pronotal tubercle reaching tegula. Scutum shorter than pronotum (20:24), granulated and reticulate rugose. Notauli incomplete, reaching about 0.65 length of scutum. Scutellum shorter than scutum (10:20), apparently as sculptured as scutum. Metanotum shorter than scutellum (7:10), apparently as sculptured as scutum. Propodeum slightly longer than scutum (21:20), with dorsal surface much longer than posterior surface (15:6); dorsal and posterior surface reticulate rugose, without longitudinal keels. Shape of pronotum, scutum, scutellum and metanotum usual for Dryininae . Fore wing with two large dark transverse bands, with usual venation of Dryininae ; pterostigma narrow, much longer than broad (26:3); marginal cell open; distal part of stigmal vein slightly longer than proximal part (12:10); stigmal vein weakly S -shaped; fore wing with usual three basal cells clearly enclosed by pigmented veins (costal, median and submedian cells). Hind wing hyaline, without dark transverse bands. Fore wing and hind wing shape usual for Dryininae . Fore leg segments in following proportions: 18 (coxa): 26 (trochanter): 38 (femur): 29 (tibia): 13 (tarsal segment 1): 2 (tarsal segment 2): 8 (tarsal segment 3): 16 (tarsal segment 4): 27 (tarsal segment 5). Enlarged claw shorter than segment 5 of protarsus (20:27). Protrochanters with long proximal slender stalk, distally broadened, approximately 6.5 times as long as broad (26:4)(greatest breadth measured on distal club). Segment 3 of protarsus produced into a hook. Rudimentary claw and arolium not distinct. Enlarged claw ( Fig. 2 B) with one very strong and large subapical tooth and without lamellae. Segment 5 of protarsus ( Fig. 2 B) with many long lamellae (number of rows of lamellae not distinct); distal apex with group of many lamellae located around central hollow. Midleg segments in following proportions: 13 (coxa): 8 (trochanter): 32 (femur): 22 (tibia): 27 (tarsal segment 1): 11 (tarsal segment 2): 8 (tarsal segment 3): 4 (tarsal segment 4): 6 (tarsal segment 5). Hindleg segments in following proportions: 18 (coxa): 9 (trochanter): 38 (femur): 55 (tibia): 28 (tarsal segment 1): 14 (tarsal segment 2): 10 (tarsal segment 3): 5 (tarsal segment 4): 7 (tarsal segment 5). Metasoma without distinct petiole. Length and breadth of wings usual for Dryininae . Shape of body usual for Dryininae . Tibial spurs apparently 1/1/1.

Male: unknown.

Hosts. Unknown.

Etymology. This species is named after the lack of lamellae on the enlarged claw. Remarks. The only extant Neotropical species of Dryinus constans group with enlarged claw not provided of lamellae is D. citricolus Olmi 1984 , known from the Bahamas and Puerto Rico. This species is very different from D. alamellatus , because the subapical tooth of the enlarged claw is smaller ( Olmi 1984: Fig. 563) and the colour is testaceous (black in D. alamellatus ).

Dryinus palaeodominicanus Currado & Olmi ( Figs 2 C, 3, 4A)

Dryinus palaeodominicanus Currado & Olmi 1983: 330 .

Dryinus palaeodominicanus Currado & Olmi: Olmi 1995 : 266. Dryinus palaeodominicanus Currado & Olmi: Olmi & Bechly 2001 : 50.

Type material. HOLOTYPE, Ƥ, Lower/Middle Miocene amber from Dominican Republic (ca. 16 mybp) ( MRSNT). Further specimens examined: same locality label, 1 Ƥ from Bayaguana mine ( AMNH); 1 Ƥ labelled H-10-23O from an unknown mine (“La Toca” or “Palo Alto”)( GPJC); 1 Ƥ labelled H-10-23B from an unknown mine (“La Toca” or “Palo Alto”)( GPJC); 1 Ƥ labelled C from an unknown mine (JSC); 1 Ƥ from an unknown mine (JVC).

Diagnosis. Female of Dryinus with pronotal tubercle not reaching tegula, notauli incomplete; fore wing crossed by two dark transverse bands. Male unknown.

Redescription. Female: macropterous; length 4.8–6.0 mm. Colour black, except mandible brown-testaceous and legs testaceous. Antenna 10-segmented, long and slender, weakly thickened distally; antennal hairs hardly distinct, much shorter than breadth of segments; antennal segments in following proportions: 12:7:39:19:18:13:8:8:6.5:6.5; antenna more than three times as long as head (length of head in dorsal view from occipital carina behind ocelli to distal apex of mandible): 137:40; antennal torulus touching margin of clypeus. Head with vertex and face apparently reticulate rugose; clypeus with ventral margin strongly bidentate; mandible with 4 teeth progressing larger from anterior one to posterior; eye normally bulging, apparently bare, except for few long hairs; malar space with furrow joining lower corner of eye to base of mandible; temple absent; POL = 5; OL = 3; OOL = 9; OPL = 1; frontal line complete; occipital carina of holotype only clearly distinct on dorsal side of head, directed towards upper corner of eye, not distinct on sides of head and on ventral side; in one specimen of JVC occipital carina absent on sides and ventral side of head, present only on dorsal side. Maxillary palpi apparently 6-segmented. Labial palpi apparently 3-segmented; last labial palp segment very long and slender. Pronotum completely granulated, slightly shorter than head (36:40), crossed by anterior weak transverse impression and posterior strong transverse furrow; disc humped; posterior collar very short, much shorter than anterior collar (3:11); posterior transverse furrow and posterior collar with median longitudinal carina; pronotal tubercle not reaching tegula. Scutum shorter than pronotum (22:36), granulated and reticulate rugose. Notauli incomplete, reaching about 0.65 length of scutum. Scutellum and metanotum shorter than scutum, apparently as sculptured as scutum. Propodeum not clearly distinct; dorsal surface apparently reticulate rugose, apparently as long as posterior surface. Shape of pronotum, scutum, scutellum and metanotum usual for Dryininae . Fore wing very slender, with two dark transverse bands, with usual venation of Dryininae ; pterostigma narrow, much longer than broad (30:4); marginal cell closed; distal part of stigmal vein much longer than proximal part (50:8); stigmal vein S -shaped; fore wing with usual three basal cells clearly enclosed by pigmented veins (costal, median and submedian cells). Hind wing hyaline, without dark transverse bands. Fore wing and hind wing shape usual for Dryininae . Fore leg segments in following proportions: 35 (coxa): 40 (trochanter): 62 (femur): 56 (tibia): 21 (tarsal segment 1): 3 (tarsal segment 2): 8 (tarsal segment 3): 24 (tarsal segment 4): 34 (tarsal segment 5). Enlarged claw about as long as segment 5 of protarsus. Protrochanters with a long proximal slender stalk, distally broadened, approximately four times as long as broad (40:9.5)(greatest breadth measured on distal club). Segments 2 and 3 of protarsus produced into hooks. Rudimentary claw hardly distinct. Arolium much shorter than enlarged claw (8:34). Enlarged claw ( Fig. 4 A ) with one strong subapical tooth and with one row of 16 lamellae. Segment 5 of protarsus ( Fig. 4 A ) with 2–3 rows of about 31 lamellae; distal apex with group of about 30 lamellae located around central hollow. Midleg segments in following proportions: 14 (coxa): 5 (trochanter): 30 (femur): 49 (tibia): 28 (tarsal segment 1): 15 (tarsal segment 2): 10 (tarsal segment 3): 5 (tarsal segment 4): 8 (tarsal segment 5). Hindleg segments in following proportions: 25 (coxa): 10 (trochanter): 43 (femur): 74 (tibia): 31 (tarsal segment 1): 19 (tarsal segment 2): 15 (tarsal segment 3): 7 (tarsal segment 4): 11 (tarsal segment 5). Metasoma without distinct petiole. Length and breadth of wings usual for Dryininae . Shape of body usual for Dryininae . Tibial spurs 1/1/2.

Male: unknown.

Hosts. Unknown.

Figures

FIGURE 1. Dryinus alamellatus sp. nov., holotype Ƥ, lateral (A) and dorsal (B) view. Length 9.1 mm.

FIGURE 2. Dryinus alamellatus sp. nov., holotype Ƥ, lateral view (A), with magnified chela (B). C. D. palaeodominicanus, Ƥ (JVC). Length 4.0 mm.

FIGURE 4. A. Dryinus palaeodominicanus, chela of holotype. B. D. priscus, holotype Ƥ. Length 4.0 mm.