Mesembrina nigribasis, Kuchta, James S. & Savage, Jade, 2008

Kuchta, James S. & Savage, Jade, 2008, Revision of the new world fauna of Mesembrina Meigen (Diptera: Muscidae) with the description of a new neotropical species, Zootaxa 1689, pp. 29-50: 46-48

publication ID

http://doi.org/ 10.5281/zenodo.180599

persistent identifier

http://treatment.plazi.org/id/9207D80B-FF82-FF99-D7C3-FC4EFC3419A3

treatment provided by

Plazi

scientific name

Mesembrina nigribasis
status

sp. nov.

Mesembrina nigribasis  sp. nov.

Figs. 1View FIGURE 1 C, 1 F, 1 I, 5 A –G.

Diagnosis: Large species, entirely black ( Fig. 1View FIGURE 1 C). Gena black pollinose. Thorax and abdomen with only black hairs, three dusted white lines on prescutum present. Only known species with wing base and calypters intensely black, M 1 vein ending past wing apex ( Fig. 1View FIGURE 1 F). T 2 of males not curved or elongated but with row of fine pv setae increasing in length towards apex ( Fig. 1View FIGURE 1 I).

Etymology: The name refers to the black wing base, a feature that distinguishes this species from all other members of Mesembrina  .

Type material examined: Holotype ɗ – “ Costa Rica: Prov. San José: Pérez / Zeledón, P. N. Chirripó, Llano Bonito. / 2450m. 30 ENE 2000. B. Hernández. / Manual L S 378500 513200 # 57131 ”; “ Holotype ɗ / Mesembrina nigribasis  / Kuchta & Savage [red]” ( INBC).

Paratypes (all with a yellow label reading: Paratype [sex] / Mesembrina nigribasis Kuchta & Savage  ): 5 ɗ same data as holotype (3 INBC, 1 CNC, 1 USNM); 3 ɗ, Prov. San Jose: Pérez Zeledón, Pque Nal Chirripó por Llano Bonito. 2200m. 29 JUL 2000. M. Alfaro. Manual L_S_ 512000 _ 379300 # 58935 ( INBC); 2 ɗ, Prov. San Jose: Pérez Zeledón, Pque Nal Chirripó por Llano Bonito 2450m. 26 ENE 2000. A. Picado Manual L_S_ 378500 _ 513200 # 57038 ( INBC); 1 ɗ, Prov. San Jose: Pérez Zeledón, Pque Nal Chirripó. Monte Sin Fe. 3180m. 26 ENE 2000. M. Alfaro. Manual (red, libre) L S 377530 515340 # 56271 ( INBC); 1 ɗ, C. Turrúbares, 1750m, 7 feb 1993. J.C. Saborío. L-N-197500, 484650, INBC / CRI 0 / 0 1192788 ( INBC); 5 ɗ, Prov. San José: F. Cementerio de la Máquina, 2100-5000 m, P. N. Chirripó, 2 mar 1993. F. Quesada, M. Segura. L-S- 378700, 512500 (4 INBC, 1 USNM); 2 ɗ, same data except M.A. Zumbado, L-S- 378700, 512500 ( INBC); 2 ɗ, Heredia: Estac. Barva. Braulio Carrillo. N.P. 2500 m. Mar 1990. G. Rivera, 233400-523200 ( INBC); 1 Ψ, Prov Puntarenas: Coto Brus, Sendero a Cerro Echandi, 1 er Campamento. 900m. 12 ABR 1998. E. Navarro. Manual _N_ 326500 _ 571700 # 57375 ( INBC); 1 ɗ, Prov. Puntarenas: Coto Brus, P.Int. La Amistad, Estación Pittier, Fila Pitter, 2200m, 19 FEB 2002. M. Alfaro, Libre L_S_ 332800 _ 579050 # 63227 ( INBC); 5 ɗ, Prov. Puntarenas: Coto Brus, Send. entre Est. Tres Colinas y Laguna Seca. 2100-2500m. 19 JUL 2000. M. Alfaro. Libre. L_S_ 344300 _ 565800 # 63227 (2 INBC, 2 BMNH, 1 CNC); 2 ɗ, Prov. Puntarenas: Coto Brus, Z.P. Las Tablas, E.B. Las Alturas, S. Cerro Chai. 2100m. 13 ENE 2001. M. Alfaro. Manual. L_S_ 592150 _ 32440 # 61814 ( INBC); 3 ɗ, Prov. Puntarenas: Sendero a Cerro Echandi. 2600m. 13-14 ABR 1998. B. Gamboa. Colectado en una fila. L_S_ 329700 _ 593100 # 50725 ( INBC); 1 ɗ, Prov. Puntarenas: Est. Biologica Las Alturas, Send. a Cerro Chai. 1700m. 15 ABR 1998. E. Navarro. L_S_ 324100 _ 591500 # 51635 ( BUIC); 1 ɗ, Prov. Puntarenas: Zona Prot Las Tablas, Est Las Alturas, Cerro Chay. 2000m. 1 ABR 2000. M. Alfaro. Manual (red, libre) L S 324500 592100 # 56447 ( BUIC).

Description: Male: body length 11.3–12.5mm.

Head: Background color black, parafacial dusted silver and gena black pollinose; eye sparsely haired; distance between eyes 1.0x – 1.2 x distance between the outer margins of the posterior ocelli; 6–8 fine black medioclinate fr and with abundant weaker medioclinate, proclinate or reclinate orb, tuft of short black setae posterior to ocellar triangle, 1 i vt and 1–2 convergent pavt; palpus dark reddish to black, 5.0x as long as wide; pedicel black, haired and with 2 setae more than 2.0x length of others; first flagellomere black, 4.0x as long as wide; basal half of arista thickened and often dark orange; prementum haired and glossy, 2.0– 2.5 x as long as wide

Thorax: Glossy black; covered in fine black hairs and setae, postpronotal lobes and medial portion of prescutum with silvery dust appearing as three distinct lines; anepimeron haired with a tuft of longer hairs on dorsal edge; dorsal thoracic bristles black and often nearly indistinguishable from surrounding hairs; anepimeron haired with a tuft of longer hairs on dorsal edge; 0 + 2 acr, anterior postsutural acr 0.75 x length of posterior one, 0 + 1–2 dc, if 2 postsutural dc present, then anterior one weaker, 1 + 0 ial, 1 + 5–6 spal, 3 npl, 2 pal; anepisternum bare anteriorly; 0 a kepst, 1 p kepst; postpronotum haired, with 2–3 strong ppnl; scutellum glossy black sometimes reddish, 1 pair of apical sctl, 8 pairs of lateral sctl.

Legs: Black, fifth tarsomere flattened on all legs; pulvilli large, 2.0x as long as wide; F 1 with 1 row of equal pd on basal two-thirds, 1 row of p decreasing in size from base and 1 complete row of sub-equal v; F 2 with 3–5 p in a group near apex; F 3 with 1 row of sub-equal av and ad, apical third of av and ad rows stronger than basal sections; T 1 with very fine and short a giving the surface a shiny brown look, 1 strong ad and 1 d near apex; T 2 ( Fig. 1View FIGURE 1 I) with 1 strong ad located on apical third, 1 row of 5–8 strong p sub-equally spaced and 1 row of fine black pv on apical two-thirds increasing in length apically but of equal length on apical third; T 3 with 1 d near apex and 1 long pd near midpoint; fore tarsomeres: 1> 2> 3> 4 <5; mid tarsomeres: 1> 2> 3> 4 <5; hind tarsomeres: 1> 2> 3> 4 <5, tarsomeres 1, 4– 5 with very fine brown and short p giving the surface a shiny look and tarsomeres 2–3 with fine short yellowish p.

Wing: ( Fig. 1View FIGURE 1 F). Mostly clear with heavy black tinge on basal half; basicosta black; wing veins black on basal half, yellow medially, brown on apical half; M 1 vein running parallel to wing margin on apical quarter of wing ending at or slightly before wing apex; alula with black tinge; calypters black.

Abdomen: Shiny black; densely covered in fine black hairs. Sternite 5 1.2 x as long as wide ( Fig. 5View FIGURE 5. M D).

Postabdomen: Epandrium wider than high ( Fig. 5View FIGURE 5. M B); mesolobus higher than wide with outer ventral projection slightly longer than inner projection ( Fig. 5View FIGURE 5. M B); surstylus short, lightly bent medially with apex ending abruptly with a straight edge in posterior view ( Fig. 5View FIGURE 5. M B), rounded in lateral view ( Fig. 5View FIGURE 5. M A); pregonite with base wide, projecting dorsally and apex slender, with 4 lateral setae ( Fig. 5View FIGURE 5. M C); postgonite with base slightly concave and with several small lateral setae and apex rounded, 2.0x as high as width of base ( Fig. 5View FIGURE 5. M C); epiphallus with apex forked, as long or slightly shorter than phallapodeme ( Fig. 5View FIGURE 5. M C); apex of phallapodeme bulb-shaped ( Fig. 5View FIGURE 5. M C); ejaculatory apodeme large and well sclerotized; lateral sclerites of distiphallus broad and weakly sclerotized, apical section with sparse spinules ( Fig. 5View FIGURE 5. M C).

Female: body length 12mm (description based on a single specimen). Differs from male as follows:

Head: Distance between eyes 5.0x distance between the outer margins of the posterior ocelli, tuft of short setae posterior to ocellar triangle black, frontal vitta black, many fine setae sometimes present on frontal vitta; 1 pavt; 6 medioclinate fr, stronger anteriorly, 2 strong reclinate orb and numerous fine proclinate orb 0.5 x the length of longer orb and not extending onto the parafacial.

Thorax: As in male.

Legs: T 2 with 2 v on basal two-thirds.

Wing: As in male.

Abdomen: As in male.

Postabdomen: Anterior portion of tergite 8 split longitudinally into 2 rectangular parallel rods, posterior plate of tergite 8 with 8–9 robust sub-equal setae ( Fig. 5View FIGURE 5. M E); anterior portion of sternite 8 split longitudinally into 2 club-shaped parallel plates, posterior plate of sternite 8 with 3 robust sub-equal setae ( Fig. 5View FIGURE 5. M F); tergite 10 bare except for 2 pairs of strong setae on the posterior margin ( Fig. 5View FIGURE 5. M E); cercus bare, cercal pegs small ( Figs. 5View FIGURE 5. M E, 5 F); spermathecae 2.0x as long as wide ( Fig. 5View FIGURE 5. M G).

Distribution: NEOTROPICAL: Costa Rica: Heredia, Puntarenas, San Jose.

Remarks: This new species of Mesembrina  represents a significant range extension for the genus as it is the only species found in the Neotropical Region. All specimens known to the authors have been collected at or above an altitude of 900m, with the majority found above 2000m.

INBC

Instituto Nacional de Biodiversidad (INBio)

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

USNM

Smithsonian Institution, National Museum of Natural History

CRI

Universidade do Extremo Sul Catarinense, Bairro Universitário

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Muscidae

Genus

Mesembrina