Labena littoralis Gonzalez-Moreno & Bordera, sp. nov.
Creators: name: González-Moreno, Alejandra
name: Bordera, Santiago
name: Sääksjärvi, Ilari Eerikki
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Labena
Labena littoralis

description: Labena littoralis González-Moreno & Bordera, sp. nov.
(Figs 1 A, 1C, 2A, 2C, 2E, 3A, 3C, 3E, 3G, 6)
Diagnosis. Labena littoralis can be distinguished from all New world species by the following characters in combination: metapleuron without longitudinal striae (Figs 2 C, 3C); flagellum, in dorsal view, orange, basally and apically dark brown to black; fore wing hyaline, yellowish tinged, without a subapical black spot (Figs 1 A, 1C); sternite I without a central transverse ridge; propodeum yellow with most part of carinae black (Figs 2 A, 2C, 3A, 3C). Metasomal tergites from third to the apex, dark brown to black anteriorly, yellow banded posteriorly, in males tending to be light brown centrally (Fig. 3 G). Propodeum of female (Fig. 2 A) with area basalis very transverse, 2.7 × as broad as long; area superomedia hexagonal, not strongly narrowed posteriorly; area petiolaris not defined by median lateral carinae so confluent with area posteroexterna and dentipara; area externa longer than broad; area lateralis conspicuously shorter than broad, very transverse (Fig. 2 C). Tergite I of female about 2.2 × as long as posteriorly broad (Fig. 2 E). Tergite I of male sub-parallel sided (Fig. 3 E). Tergites III-IV with posterior margin deeply concave and membranous (Fig. 3 G).
Description. Female. Body length (excluding ovipositor) 15 mm. Fore wing length 12 mm.
Head. In dorsal view, about 2.1 × as wide as long; clypeus in anterior view, basally flat, with a broad shallow impression either side of slightly convex central apical region, with apical margin centrally strongly convex, about 1.8 as broad as high; clypeo-facial suture with scattered and long setae; malar space 0.3 × as long as basal width of mandible; frons flat, shiny, with very fine setiferous punctures; vertex and gena smooth and shiny with very fine setiferous punctures; gena, in dorsal view, short, abruptly constricted behind eyes, about 0.3 × as long as eye; lower part of gena very broad; interocellar area elevated; posterior ocellus separated from eye by 1.6 × its own maximum diameter; distance between posterior ocelli about 1.6 × maximum diameter of posterior ocellus; occipital carina complete, reaching hypostomal carina far from base of mandible, at a distance of 0.8 × the width of mandible base; hypostomal carina from base of mandible to the union with occipital carina strongly raised; antenna with 43 flagellomeres; subbasal flagellomeres more or less elongate, subapical ones subquadrate, apical flagellomere subtriangular with apex bearing a small flat sensillum.
Mesosoma. Pronotum smooth and shiny with upper lateral corner with dense fine setiferous punctures and lower part, glabrous; in dorsal view, with two lateromedian pits centrally; epomia absent; mesoscutum finely and densely punctate, with notauli absent, virtually without transverse crest at anterior end; scutellum densely punctate, slightly convex, without lateral carinae; mesopleuron smooth and shiny, with upper end of epicnemial carina curved towards anterior margin slightly below the centre of hind margin of pronotum; metapleuron smooth and shiny, posteriorly with very fine and sparse setiferous punctures, setae long (Fig. 2 C); propodeum (Figs 2 A, 2C) smooth and shiny with very dense setiferous punctures anteriorly to posterior transverse carina, except in area superomedia centrally; pleural carina absent anteriorly, so that area spiracularis is open externally, present posteriorly and enclosing area lateralis; in dorsal view, with area superomedia hexagonal clearly delineated anteriorly, posteriorly less strongly defined, but always separated from area petiolaris, about 1.3 × as broad as long; area basalis transverse, 2.7 × as broad as long; area dentipara confluent with area posteroexterna and area petiolaris; lateral longitudinal carina complete, area externa slightly elongate, fully enclosed, about 0.9 × as broad as long; area lateralis transverse, ventrally quite shorter than dorsally. Mid leg with tibia inflated in distal 0.7, with scattered bristles on outer surface, second tarsomere about 0.9 × as long as broad and as same length of the following two tarsomeres; hind coxa about 1.8 × as long as deep; hind tibia with scattered bristles. Fore wing with areolet transverse, 0.44 × as broad as length of distal abscissa of M, with 3rs-m subequal to 2rs-m; vein Cu-a opposite to vein Rs & M; abscissa of Cu 1 between 1 m-cu and Cu 1 a as long as Cu 1 b. Hind wing with vein Cu-a longer than abscissa of M+Cu between M and Cu 1.
Metasoma. Tergite I, about 2.2 × as long as posteriorly broad, without lateromedian and lateral carinae (Fig. 2 E); sternite I short, reaching 0.4 of length of tergite, without a central transverse ridge; tergite II, 0.8 × as long as posteriorly broad, with fine and very dense pubescence; ovipositor sheath 1.8 × as long as hind tibia (Fig. 1 A), strongly laterally compressed, the apex of the lower valve with fine file-like teeth, and with a small scabrous area basal to these teeth.
Coloration (Fig. 1 A). A predominantly yellow species. Head with black marks on gena along occipital carina, a transverse band through the ocelli, and longitudinal stripe centrally at occiput; scape and pedicel dorsally dark brown; flagellum basally dark brown, dorsally progressively orange until flagellomere 22, from flagellomere 23 to apex dark brown, ventrally more widely orange; mesosoma with three longitudinal black marks on mesoscutum confluent with prescutellar groove; black marks on peripheries of mesoscutum, part of tegula, posterior band on scutellum, transverse furrow at base of propodeum, and all anterior carinae of propodeum from posterior transverse carina, except abscissae closing area superomedia posteriorly; dorsal and anterior periphery on mesopleuron, upper division on metapleuron; tergite I of metasoma infuscate subapically; tergite II basally with bilobed infuscate mark, following tergites with anterior 0.6 or more, black. Legs with a light brown stripe on posterior side of front and mid femora and base of tibiae; hind coxae, trochanters, femora and tibiae; hind tarsi infuscate. Ovipositor sheath light brown, dark brown at apex. Fore wing hyaline, yellowish tinged, without a subapical black spot.
Male. Similar as female except in the following characters:
Body length 8–11 mm. Fore wing length 6–8 mm.
Head 1.8–2.0 × as broad as long; clypeus 1.7–1.8 × as broad as high; malar space 0.19–0.23 × as long as basal width of mandible; gena slightly rounded and constricted behind eyes, 0.27–0.35 × as long as eye, lower part of gena moderately broad; posterior ocellus separated from eye by 1.4–1.7 × its own maximum diameter; distance between posterior ocelli 1.5–2.0 × maximum diameter of posterior ocellus; occipital carina reaching hypostomal carina far from base of mandible at a distance of 0.75–0.77 × the width of mandible base; antenna with 40–45 elongate flagellomeres. Area superomedia pentagonal clearly delineated, 1.0–1.1 × as broad as long; area petiolaris obliterated by median longitudinal carina; area basalis cuadrangular, 1.25 × as broad as long (Fig. 3 A); area dentipara separated from area posteroexterna; area externa 0.86–0.89 × as broad as long (Fig. 3 A). Mid leg with tibia not inflated, second tarsomere elongate, 6.0 × as long as broad, 1.0–1.1 × as long as following two tarsomeres; hind coxa about 3.8–4.5 × as long as deep. Fore wing with areolet, 0.30–0.38 × as broad as length of distal abscissa of M. Tergite I, 3.4–3.9 × as long as posteriorly broad, sub-parallel sided (Fig. 3 E); sternite I, reaching 0.5 of length of tergite; tergite II, 1.9–2.0 × as long as posteriorly broad, with fine and moderately dense pubescence; tergites III– IV with posterior margin deeply concave and membranous (Fig. 3 G).
Coloration (Fig. 1 C). As female but pedicel orange; flagellum orange with former and apical 4–6 flagellomeres dark brown to black; all carinae of propodeum (Figs 3 A, 3C) dark brown to black, except posterior abscissa of lateral longitudinal carina separating area posteroexterna from area coxalis, posterior carina enclosing area superomedia and longitudinal carina obliterating area petiolaris; tergite II dark brown to black in anterior half; front and mid legs entirely yellow; hind leg mostly light brown, tibia infuscate at distal part, tarsomeres dark brown.
Variation. Some males have a black spot at central part of mesopleuron and first tergite not infuscate and/or black marks of tergites tending to be brown, posteriorly. Specimen from French Guyana has antenna dark brown ventrally, and tergites from V to apex entirely dark brown.
Etymology. The name refers to the littoral area of Yucatán, where the holotype was collected.
Phenology. Figure 6.
Taxonomic remarks. In comparison with the other Mexican species, L. littoralis is very close to L marginata but can be distinguished from it by the following characters in combination:
L. littoralis: Propodeum (Figs 2 A, 2C, 3A, 3C) with area basalis very transverse, in female 2.7 × as broad as long, in male, 1.25 × as broad as long; area petiolaris not defined by median lateral carinae, confluent with area posteroexterna and dentipara; area externa longer than broad; area lateralis conspicuously shorter than broad, very transverse. Tergite I of metasoma about 2.2 × as long as posteriorly broad in female (Fig. 2 E); in male, 3.4–3.9 × as long as posteriorly broad, sub-parallel sided (Fig. 3 E). Male with flagellum orange, dorsally at base and apically dark brown to black (Fig. 1 C). Tergites III–IV with posterior margin deeply concave and membranous (Fig. 3 G).
L. marginata (Figs 1 B, 1D): Propodeum (Figs 2 B, 2D, 3B, 3D) with area basalis not more than twice as broad as long, usually longer than broad in males; area petiolaris defined by median lateral carinae or obliterated; area externa conspicuously broader than long; area lateralis almost as long as wide, slightly transverse. Tergite I of metasoma 1.7–1.8 × as long as posteriorly broad in female (Fig. 2 F); in male, 2.9-3.1 × as long as posteriorly broad, with divergent sides from base to apex (Fig. 3 F). Male with flagellum entirely orange. Tergites III–IV with posterior margin straight, not with exposing membrane (Fig. 3 H).
Material examined. Holotype female (CER-UADY currently loaned in CEUA), Mexico, Yucatán, Rio Lagartos, Nucleo, 23.XII.2008 – 07.I.2009, Sabana, TM 7, leg. González. Paratypes: Mexico, Yucatán, El Cuyo, Cementerio, 18.III–01.IV.2009, Matorral, TM6, leg. González, 1 ♂ (CER-UADY); same locality, 22.X– 10.XI.2008, Matorral, TM6, leg. González, 2 ♂ (CER-UADY); El Cuyo, Punta Mecoh, 22.X–10.XI.2008, Matorral, TM3, leg. González, 1 ♂ (CEUA); same locality and date, TM4, leg. González, 4 ♂ (CER-UADY); same locality, 26.XI–10.XII.2008, Matorral, TM 4, leg. González, 1 ♂ (CEUA); same locality, 23.XII.2008 – 7.I.2009, Matorral, TM 4, leg. González, 1 ♂ (ZMUT); same locality, 21.I–4.II.2009, Matorral, TM 4, leg. González, 1 ♂ (CER-UADY); El Cuyo, Sacboh, 4–18.III.2008, Selva, TM 2, leg. González, 1 ♂ (CEUA); same locality, 21.I– 4.II.2009, Selva, TM 2, leg. González, 1 ♂ (CER-UADY); El Cuyo, Tekal, 18.III–1.IV.2009, Selva, TM 12, leg. González, 1 ♂ (CEUA); Rio Lagartos, Nucleo, 26.XI–10.XII.2008, Sabana TM 8, leg González, 1 ♂ (CEUA); same locality, 10–23.XII.2008, Sabana, TM 8, leg. González, 2 ♂ (CEUA); same locality and date, TM 7, leg. González, 2 ♂ (CER-UADY); same locality, 23.XII.2008 – 07.I.2009, Sabana, TM 8, leg. González, 3 ♂ (CEUA); same locality, 21.I–4.II.2009, Sabana TM 7, leg González, 2 ♂ (CER-UADY); same locality, 4–8.II.2009, Sabana TM 8, leg. González, 5 ♂ (CEUA); same locality and date, TM 7, leg. González, 1 ♂ (CER-UADY); same locality, 18.II–4.III.2009, Sabana TM 7, leg. González, 1 ♂ (CEUA); same locality, 27.V–10.VI.2009, Sabana, TM 8, leg. González, 1 ♂ (CER-UADY); Rio Lagartos, Poste, 10.XI–26.XI.2008, Sabana, TM 9, leg. González, 1 ♂ (CEUA); same locality, 26.XI–10.XII.2008, Sabana, TM 9, leg. González, 1 ♂ (CER-UADY); same locality and date, TM 10, leg. González, 1 ♂ (CEUA); same locality, 10–23.XII.2008, Sabana, TM 9, leg. González, 2 ♂ (CEUA); 23.XII.2008 – 07.I.2009, Sabana, TM 9, leg González, 2 ♂ (CEUA); 7–21.I.2009, Sabana, TM 8, leg. González, 1 ♂ (ZMUT); same locality and date, TM 9, leg. González, 3 ♂ (2♂ CEUA, 1 ♂ ZMUT). Non type material: French Guyana, RN Trinité, 26–28.V.2012, sweeping, SEAG coll., 1 ♂ (ZMUT).
description: Published as part of González-Moreno, Alejandra, Bordera, Santiago & Sääksjärvi, Ilari Eerikki, 2015, Description of three new species of Labena Cresson from Mexico (Hymenoptera, Ichneumonidae, Labeninae), with notes on tropical species richness, pp. 573-586 in Zootaxa 3948 (3) on pages 574-580, DOI: 10.11646/zootaxa.3948.3.9, http://zenodo.org/record/239206