Trentepohlia (Paramongoma) miocenica, Mederos & Wang & Duque-Valero & Campeny, 2020

Mederos, Jorge, Wang, Yinan, Duque-Valero, Susana & Campeny, Marc, 2020, A new fossil species of Trentepohlia (Diptera, Limoniidae) from the Dominican Miocene, Zoosystema 42 (29), pp. 583-592 : 587

Trentepohlia (Paramongoma) miocenica Mederos & Wang n. sp.

( Figs 2-4 )

urn:lsid:zoobank.org:act:059E96DC-09D1-478C-AAFC-81146CF79C28

TYPE MATERIAL. — Holotype. Dominican Republic • ♂; MZB 2019-0707 ; Mine in El Valle , Eastern Cordillera, Yanigua formation; Y.Wang leg. [syninclusions: seven specimens of Cecidomyiidae ( MZB 2019-0708 to MZB 2019-0714 ) and one Ceratopogonidae MZB 2019 -0715 (all Diptera )].

Paratypes. Dominican Republic • 2 ♂; MZB 2019-0716 , MZB 2019-0717 ; same data as for holotype; [syninclusions: one specimen Coleoptera, MZB 2019-0718 ] • 1 ♂; MZB 2019-0719 ; same data as for holotype • 1 ♂; MZB 2019-0720 ; same data as for holotype; [syninclusions: one Formicidae specimen ( Hymenoptera ) MZB 20190721 and one Hemiptera specimen (fragments) MZB 2019-0722 ] • 1 specimen unknown sex (presumably male, terminalia destroyed by the polishing of the piece); MZB 2019-0723 ; same data as for holotype [syninclusions: one specimen Keroplatidae MZB 2019-0724 ( Diptera ) and one specimen Parasitica ( Hymenoptera ) MZB 2019-0725 ] • 1 ♂ (terminalia partially destroyed by the polishing of the piece); MZB 2019-0726 ; same data as for holotype [syninclusions: one specimen Ceratopogonidae MZB 2019-0727 ( Diptera )] .

DIAGNOSIS. — The species is characterized by a dark brown, wellmarked stigma on the hyaline wing and accompanied (surrounded) by a pale brown area that spans the stigmatic region and cells r 1, r 2 and r 3, and also by a single gonostylus, narrow at its base with a small and slender tooth shape lobe, and lanceolate in its apical half.

ETHYMOLOGY. — This interesting fossil species takes its name from the Miocene, the geological epoch from which it proceeds, a latinized adjective.

DESCRIPTION

Male (holotype)

Length. Body (without antennae) 4.5 mm ( Fig. 2B ); antennae 1.1 mm ( Fig. 3C ); wing 3.8 mm ( Fig. 3A, B ).

Head. Brown. Compound eyes completely covering the head, holoptic. Antenna 16 segmented ( Fig. 3C ), brown throughout. Scape four times as long as wide, pedicel oval and about half the length of the scape. Flagellomeres 1-8 ovoids, 9-14 slightly elongate. Flagellomere 1 greater than the rest, shorter than pedicel. Apical flagellomere longer than the preceeding flagellomere. Flagellomeres with verticils in their middle part, slightly shorter than the respective flagellomeres.

Thorax. Completely brown ( Fig. 4B, C ), without showing any evident pattern of stripes on the prescutum, scutum or pleura (in one of the paratypes, the pleura a slightly lighter brown). Coxae and legs completely brown throughout. Halters brown.

Wings ( Fig. 3A, B ). Translucent with a dark brown, wellmarked stigma accompanied (surrounded) by a pale brown area that spans the stigmatic region and cells r 1, r 2 and r 3; length of R 2 greater than R 3; Rs almost straight, almost four times the length of bm-cu; R 4 + 5 just over eight times the length of R 3; length of bm-cu less than the distance between the distal ends of CuA 2 and A 1.

Abdomen. Brown throughout. Hypopygium brown ( Fig. 4A ). Gonocoxites conical in shape, twice as long as wide. Gono-stylus single, as long as the gonocoxite, narrow at its base and lanceolate in its apical half, with a small and slender tooth shape lobe located in the basal half, approximately a quarter the length of the gonostylus ( Fig. 4A ).

Female. Unknown.

DISTRIBUTION AND AGE. — Dominican Republic resinites, Miocene (16-15 Ma).

REMARKS

When analyzing the male terminalia of Trentepohlia miocenica Mederos & Wang n. sp. similarities are observed with T. agri , the only other species of the subgenus present in the fossil record of Hispaniola, specifically the presence of a lobe or projection in the basal half of the gonostylus. It is noteworthy that wide and lanceolate form of the apical half of the gonostylus in T. miocenica Mederos & Wang n. sp. differs markedly from the more slender and pointed form shown by T. agri . However, these two species can be easily differentiated by the presence of a well-marked dark brown stigma on the wing of T. miocenica Mederos & Wang n. sp., absent in the totally translucent wing of T. agri . Another diagnostic feature of T. miocenica Mederos & Wang n. sp. is the apical flagelomere of the antenna longer than the previous one (equal in T. agri ). On the other hand, the characteristics of the male terminalia of T. miocenica Mederos & Wang n. sp., as well as the smaller size of the first flagelomere with respect to the pedicel, easily separate this species from the other two closely related species T. immemorata and T. mexicana , both from the [Chiapas amber] Miocene of Mexico. Although T. immemorata , T. mexicana and T. miocenica Mederos & Wang n. sp. share the characteristic of having a well-marked stigma, they show marked differences in wing venation.

Figures

FIG. 2. — A, general configuration of the syninclusion of the resinite piece with Trentepohlia (P.) miocenica Mederos & Wang n. sp. holotype specimen,Cecidomyiidae (Ce) and Ceratopogonidae (Cr) specimens; B, habitus of the male specimen (holotype) of T. miocenica Mederos & Wang n. sp.Scale bars: A,5 mm; B, 1 mm.

FIG. 3. — Wing venation (A, B), head and antenna (C) of Trentepohlia (P.) miocenica Mederos & Wang n. sp. holotype specimen. Scale bars: A, 1 mm; B, not to scale; C, 0.5 mm.

FIG. 4. — Male terminalia (A) of Trentepohlia (P.) miocenica Mederos & Wang n. sp. holotype specimen. Thorax in lateral (B) and dorsal view (C) of two paratype male specimens. Scale bars: A, 0.2 mm; B, C, 0.5 mm.