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1 June 2013 A New Genus and Species of Urodidae (Lepidoptera: Urodoidea) from Argentina with the First Report of Asymmetric Male Genitalia in the Superfamily
Jae-Cheon Sohn
Author Affiliations +
Abstract

A new genus of Urodidae, Anomalomeuta gen. nov., is described from Argentina, with the type species, Anomalomeuta dondavisi sp. nov. The new genus is superficially similar to Spiladarcha Meyrick in having scattered small black spots comprised of raised scales along the forewing veins on the upper surface, but it lacks the 2 autapomorphies of the latter genus: a pair of spiniform setal zones on the ventroapical area of the tegumen, and a zone of longitudinal pleats on the ductus bursae. Anomalomeuta also differs from all known urodid genera by the asymmetric valvae in the male genitalia. This characteristic is reported for the first time from Urodoidea and is compared with examples of other Lepidoptera. Keys to all known urodid genera based on the external and male genital features are provided.

Urodidae, the sole family of the superfamily Urodoidea, belongs to the apoditrysian Lepidoptera. The group currently includes 66 species (Nieukerken et al. 2011), occurring predominantly in the Neotropics. The species constituting the family historically have been placed in Yponomeutidae or Plutellidae. Kyrki (1988) found that urodids are distinct from typical yponomeutoids in having ‘tortricid’ type abdominal/thoracic articulation and 3 acanthi in the frenulum of the female. Based on these features, he proposed the family Urodidae to accommodate them. Urodidae can be characterized by 5 possible autapomorphies: the lamellate male antennae, a hair-pencil on the base of the male hindwing costa; the larval prothorax without seta MXD1; the larval abdominal segment VIII with L3 ventroanterior to L1 and L2 and SV1 almost as high as L3; the larval prolegs elongate, medially constricted, with mesoseries of crochets (Kyrki 1988; Dugdale et al. 1998). Kyrki (1988) originally included 3 genera in the family: Urodus Herrich-Schäffer, 1854, Wockia Heinemann, 1870, and Spiladarcha Meyrick, 1913. Heppner (1984) resurrected Anchimacheta Walsingham, 1914, which had been synonymized with Spiladarcha. More recently, Heppner (2010) described Incawockia for a unique species from Peru. To date, a total of 5 genera have been assigned to Urodidae. However, this generic diversity appears to be underestimated, as novel lineages continue to be found in the Oriental and Neotropical regions (Sohn 2012, unpublished).

The purpose of this article is to describe a new species of Urodidae from Argentina. Because this species cannot be assigned to any known genus, a new generic name is proposed. The male genitalia of this new species possess asymmetric valvae, a characteristic that is previously unreported from Urodoidea. The possible function of this feature is discussed.

MATERIALS AND METHODS

Dried specimens were obtained from the United States Museum of Natural History, Washington DC (USNM). Genitalia slides were prepared following Clarke (1941), except that chlorazol black was used for staining and Euparal resin for permanent slide mounting. The wings were slide-mounted following Hodges (2005).

Pinned specimens were examined with a Leica MZ APO stereoscope. Slide-mounted specimens were examined with a Leica LETTZ-DMRX microscope. Images were captured using the VDBK digital imaging systems, adopted by the United States Department of Agriculture and installed in the Department of Entomology, USNM.

Verbatim label data are given only for holotype. Terms for genitalia follow Klots (1970). In the description, abdominal segments are given as abbreviations: A7, A8 and A9 for the seventh, eighth, and ninth segments. Terms for wing venation follow Wootton (1979).

TAXONOMIC ACCOUNT

Anomalomeuta gen. nov.

  • Type species: Anomalomeuta dondavisi sp. nov., by monotypy.

  • Diagnosis. The new genus can be associated with Urodidae by the forewing Rs4 vein terminating above the apex and the male genitalia possessing a digitate costal process. It is distinguished from all other urodid genera in having asymmetric valvae in the male genitalia and 4 signa in the female genitalia. Within the family, it is closest to Spiladarcha Meyrick, 1913, sharing 2 characteristics: the forewing upper surface with small black spots of raised scales along the veins and the absence of hair pencils on the hind-wings. Anomalomeuta, however, lacks 2 genital autapomorphies of Spiladarcha proposed by Sohn (2012); i.e., a pair of spiniform setal zones on the ventroapical area of the tegumen in males and a zone of longitudinal pleats on the ductus bursae in females.

  • Description

    Head: Vestiture of vertex appressed, scales piliform, directed toward frons; ocelli and chaetosemata absent; antennae filiform, without pecten; flagellomeres without scales ventrally, lamination not as clear as in Urodus; labial palpus 1st segment 1/2 as long as 2nd; 2nd segment with ventral scale tufts, denser distad; 3rd segment with obtuse apex, as long as 2nd; maxillary palpus very short, 1-segmented; haustellum naked, 2 × longer than labial palpus. Thorax: Foretibial epiphysis arising from distal 1/3 of tibia; hindtibia with hairs dorsally in both sexes, denser in males; hindwing without hair pencil in both sexes. Forewing venation (Fig. 6) with Sc reaching margin at the basal 2/3 of costa; Rs1 curved to R; Rs2–4 reaching wing margin above apex, diverging from each other; Rs3 closer to Rs4 than to Rs2 at base; M1 nearly parallel to Rs4 in basal half, slightly diverging from Rs4 in distal half; M with 3 branches equidistant at base; M2 curving to M; CuA1 and CuA2 short; CuA1 curved downward, approaching CuA2 over distal half; CuP fold close to lower margin of discal cell; accessory cell present; 1A+2A with small fork at base. Hindwing venation (Fig. 6) with Sc+R1 reaching margin at 3/5 length; Rs reaching margin at 6/7 length above apex, nearly parallel to M1; M1 terminating just above apex; M2 diverging from M1 in distal half; M3 parallel to M2, twice as far apart as M1 and M2; CuA1 slightly diverging from M3; CuA2 arising from distal 1/3 of lower margin of discal cell, curved to CuA1 in distal half, twice as far apart as M3 and CuA1 at base; CuP close to 1A+2A over basal 2/3 and then to CuA2 over distal 1/3. Abdomen: Sternum II (Fig. 3) with apodeme 1/2 as long as anterolateral process, continuing to a sclerotized zone 3 × longer than anterolateral process; a Y-shaped sclerotized zone behind the posterior margin. Male genitalia (Figs. 7–9) with uncus continuous from tegumen; tuba analis extending beyond uncus, connected with uncus process dorsally to form scaphium; subscaphium present; valvae asymmetrical, a costal process present only on one valva; phallus without coecum; ductus ejaculatorius arising dorsally; cornuti present. Female genitalia (Fig. 10) with ovipositor as a complex of A8, A9, papillae anales and an intersegmental membrane between A8 and A9, telescopic; posterior margin of A7 with emargination at ostium bursae; most of ductus bursae sclerotized; antrum present; ductus seminalis originating near corpus bursae; 4 signa present.

  • Etymology

    The generic name is derived from the ermine moth genus Yponomeuta with the Greek prefix ‘anomalo’ meaning “irregular” or “abnormal” and refers to its superficial similarity to some yponomeutines. The gender is feminine, agreeing with Yponomeuta.

  • Remarks

    Kyrki (1988) indicated that Spiladarcha is characterized by asymmetry in the male genitalia. Furthermore, the wing venation illustrated by Kyrki (1988) for Spiladarcha is remarkably similar to that of Anomalomeuta. Hence, it is very likely that Kyrki (1988) misidentified Anomalomeuta as Spiladarcha. This speculation, however, remains unverifiable because Kyrki (1988) did not provide any illustration of the external or genital features. I recently (Sohn 2012) redefined Spiladarcha. Based on this redefinition, Spiladarcha unambiguously differs from Anomalomeuta.

  • Anomalomeuta dondavisi sp. nov. (Figs. 1, 310)

  • Diagnosis

    The new species has grayish fuscous forewings similar to species of Wockia and Spiladarcha, but the forewings are narrower than in the latter two genera. Anomalomeuta dondavisi is very close to Spiladarcha adamskii Sohn, 2012 described from Venezuela (Fig. 2), but it differs in the presence of a fuscous subbasal line on the forewings (present as fuscous shade in S. adamskii) and in the presence of asymmetric valvae in the male genitalia.

  • Description

    Head: Scales of vertex and frons dark grayish brown with brownish white tips, paler medially. Antennae 3/5 as long as forewing costa; scape dark brown; basal 13 flagellomeres brownish white over proximal half, dark brown over distal half, with a dark brown basal and a brownish white terminal ring; the remaining flagellomeres dark gray. Labial palpus slightly ascending, becoming straight after 1st segment; 1st dark brown over basal half, brownish white over distal half; 2nd segment dark brown intermixed with brownish white, with dense, triangular scale tufts ventrally; 3rd segment scales dark brown, with white tips.

    Thorax: Patagia, tegulae, and mesonotal scales dark grayish brown, with brownish white tips. Foreleg dark brown, speckled with brownish white; tibia and tarsomeres with brownish white ring at distal end. Midleg with coxa brownish gray; femur dark brown with brownish white specks denser over proximal and distal areas; tibia dark brown, with brownish white band dorsally at basal 1/5, distal 2/5 densely speckled with brownish white, scales denser to distal end; tarsomeres dark brown, speckled with brownish white, with brownish white ring on distal end. Hindleg with coxa to tibia lustrous, pale yellowish gray, sparsely speckled with pale grayish brown; tarsomeres dark brown, with brownish white ring on distal end. Forewing length 5.2–7.2 mm (average = 6.4 mm, n = 12), elongate, brownish gray, termen sharply oblique, apex obtuse; subbasal line fuscous, notched medially; medial area of costa broadly fuscous, narrowed posteriorly, forming triangular patch; a patch of raised, dark brown scales at the apex of the inverted-triangular, fuscous, medial area; subterminal line fuscous, notched medially; erect scales of small dark brown dots scattered along wing veins on the upper side; fringes dark yellowish gray. Hindwing dark yellowish gray, paler basally; fringes dark yellowish gray.

    Abdomen: Tergites dark brownish gray dorsally, pale brownish gray at distal end; sternites brownish white.

    Male genitalia: Uncus subtriangular, with a needle-like apical process. Tegumen semicircular, as long as saccus; subscaphium narrow. Valvae asymmetrical, left valva spatulate, densely setose on inner surface, terminal part of ventral margin slightly extended, with a dentiform, short process; right valva triangular, 2/3 as long as left valva, densely setose on ventral half of inner surface, with a dentiform, short process apically, costa convex at basal 1/3; costal process stout, bent at basal 1/3, broadened to apex, terminal % round dorsally, straight ventrally, obtuse apically. Juxta linguiform, ventral margin round, dorsal margin with V-shape projection. Vinculum as broad as tegumen, broadly extended and linguiform distally, slightly protruding apically. Phallus straight, slightly broadened to base, spinulate in terminal 1/5, dorsal carina sagittate, spinulate; a narrow, strongly sclerotized zone in terminal 1/4 of ventral area; vesica tubular, with a cornutal zone comprised of 9 to 11, long spines near the distal end.

    Female genitalia: Ovipositor 3x longer than A7; apophyses posteriores very slender, 2x as long as apophyses anteriores; apophyses anteriores needle-like, basal 1/4 very slender. Ductus bursae slender, sclerotized except for anterior 1/6, posterior 2/5 broadened to ostium bursae (antrum), anterior 1/6 as broad as ostium bursae, flattened, concave medially, with a band-like sclerite continuous from sclerotized part of ductus bursae. Corpus bursae elliptical with four short, dentiform signa with sparsely spinulate, oval basal plates.

  • Types

    HOLOTYPE — ♂, “A.MAHUIDA-EL CRUCE | (55) 600m, | NEUQUEN ARGENT[INA] | 9-X-82 [9 Oct. 1982] | LEG. M.Y P. GENTILI”, “Genitalia slide ♂ | By JC SOHN | USNM 96485” [a green label]. PARATYPES (19 ♂, 11 ♀) — ARGENTINA [Catamarca] 1 ♀, Andalgala, 4-II-1972 (WD Duckworth), USNM-96406. [Neuquén] 1 ♂, Rio Limay, Arroyito, 16-XI-1978 (Mision Cientifica Danesa), USNM 22681; 1 ♀e;, ditto, 16-XII-1978 (Mision Cientifica Danesa); 1 ♂, ditto, 18-XII-1978 (Mision Cientifica Danesa), USNM 22477 [in capsule]; 1 ♀, ditto, 22-III-1979 (Mision Cientifica Danesa), USNM 22479 [whole body dissection, in capsule]; 1 ♀, A. Mahuida-El Cruce, 600 m, 9-X-82 (MYP Gentili); 1 ♂, 2 ♀, La Pintada Roth, 650m, 21-I-1983 (MYP Gentili), USNM-96413 (female); 3 ♀, Neuquen, Aguada Florencio, 870m, 6-I-86 (MYP Gentili); 2 ♀, Neuquen, Bajada Marucho, 870m, 21-XII-86 (MYP Gentili), USNM-96405; 3 ♂, 2fe♂, Neuquen, Chorriaca, 1100m, 14-II-87 (MYP Gentili), wing venation slide SJC-W025; 2♂, 1♀, El Chocon, 400m, 6-XII-1987 (MYP Gentili). [Mendoza] 1 ♀, Va. El Salto, 12km. SW., Potrerillos, 20-XII-1973 (CM & OS Flint); 1 ♂, 1 ♀, 4km. East, Potrerillos, 20-22-XII-1973 (CM & OS Flint); 5 ♂, Bardas Blancas, 1450m, 13-II-87 (MYP Gentili), one male dissected & unmounted. [Rio Negro] 1 ♀, S.C. de Bariloche, Colonia Suiza, 800m, 18-X-1981 (Nielsen & Karsholt), USNM 22478.

  • Distribution

    Argentina (Catamarca, Neuquén, Mendoza, Rio Negro).

  • Etymology

    The species is named after Dr. Donald (“Don”) Davis (U.S. National Museum of Natural History, Smithsonian Institution, Washington DC) who has assisted my research.

  • Figs. 1–6.

    Anomalomeuta dondavisi sp. nov. (1, 3–6) and Spiladarcha adamskii Sohn (2); 1–2. adult habitus, scale bars = 2mm; 3. abdominal segment II (AD = apodeme; ALP = anterolateral process), scale bar = 0.5mm; 4. head; 5. hindleg; 6. wing venation.

    f01_469.jpg

    Figs. 7–9.

    Male genitalia of Anomalomeuta dondavisi sp. nov.; 7. genital capsule (insets: A. juxta; B. saccular process), scale bar = 0.25mm; 8. phallus (insets: A. cornuti; B. basal region of vesica), scale bar = 0.25mm; 9. phallus with vesica and cornuti concealed inside.

    f07_469.jpg

    Fig. 10.

    Female genitalia of Anomalomeuta dondavisi sp. nov. (insets: A. antrum; B. sclerotized part of ductus bursae near to corpus bursae; C. signum), scale bar = 0.5mm.

    f10_469.jpg

    KEY TO THE GENERA OF URODIDAE BASED ON EXTERNAL CHARACTERISTICS

    1. No antemedial patches of raised scales on forewing 2

    —. One or two antemedial patches of raised scales on forewing 4

    2. Hair-pencil present on anterior margin of hindwing 3

    —. Hair-pencil absent on anterior margin of hindwing Anchimacheta

    3. Male antennae filiform Incawockia

    —. Male antennae lamellate Urodus

    4. Small black spots of raised scales present on dorsal surface of forewing along veins 5

    —. No small black spots of raised scales on forewing Wockia

    5. Two patches of raised scales in the forewing antemedial line Spiladarcha

    —. One patch of raised scales in the forewing antemedial line Anomalomeuta gen. nov.

    DISCUSSION

    Comparisons among Urodid Genera

    Urodidae are comprised of 6 genera including Anomalomeuta. These genera can be distinguished by external and male genital features. The female genitalia of Urodidae possess features useful for species-level identifications but show no diagnostic differences among the genera. The female genitalia even of congeners are usually too divergent to provide any common feature. Therefore, the keys to distinguish the urodid genera below are based only on external features and structures of the male genitalia.

    KEY TO THE GENERA OF URODIDAE BASED ON MALE GENITALIA

    1. Costal process present on both valvae 2

    —. No costal process on the valva 5

    2. Valvae symmetrical 3

    —. Valvae asymmetrical Anomalomeuta gen. nov.

    3. Phallus with coecum 4

    —. Phallus without coecum Wockia

    4. Tegumen above gnathos articulated, with a pair of digitate projections Anchimacheta

    —. Tegumen above gnathos unarticulated or, if articulated, with an elongate process Urodus

    5. Ventral surface of tegumen above gnathos with a pair of spinose areas Spiladarcha

    —. Ventral surface of tegumen above gnathos without spinose area Incawockia

    Asymmetric Male Genitalia of Anomalomeuta

    Asymmetric genitalia can be found at least ten animal phyla (Schilthuizen 2013) and widespread among insects, including Lepidoptera (Ludwig 1932). It is known that asymmetric genitalia have evolved at least 30 times independently in 11 superfamilies and 18 families of lepidopterans (Huber et al. 2007). Such a characteristic, however, has never been reported from Urodoidea, which currently includes 66 species (Nieukerken et al. 2011). Anomalomeuta as described in this study is the only genus of the superfamily that has asymmetric genitalia.

    Huber et al. (2007) found that genital asymmetry is predominantly limited to the males in insects. Anomalomeuta also has asymmetric components only in the male genitalia, involving 2 structures, i.e. the vesica of the phallus and the valvae. In fact, asymmetry of the eversible vesica is nearly universal in Lepidoptera (Chapman 1902) and appears associated with asymmetry in the female internal genitalia (Huber et al. 2007). In contrast, asymmetry of the ‘accessory’ components sensu Huber et al. (2007) occurs in relatively limited numbers of Lepidoptera and appears to be unrelated to female genital structures (Huber et al. 2007). The latter case can be observed in Anomalomeuta that has the left valva larger than the right one and also lacks a costal process.

    At least seven hypotheses have demonstrated the origin and functional advantages of the genital asymmetry (reviewed in Schilthuizen 2013). Asymmetry in the valvae or other clasping devices of the lepidopteran male genitalia very likely involves the copulation position (Huber et al. 2007). It is known that most of the lower lepidopterans engage in common mating postures (Kozlov 1985). The male first approaches the female side by side, then bends his abdomen 180° towards the tip of female abdomen and grasps the female genitalia using his valvae. Shortly thereafter, the male moves his body 180° away from the female and assumes an end-to-end position sensu Huber et al. (2007). To facilitate this change in position, the male has to twist his abdomen. Otherwise it would result in an inverted contact with the female genitalia. The asymmetric valvae of Anomalomeuta may provide the male with an advantage by allowing effective grasping the female genitalia in the side-by-side position. However, the copulatory behavior of Anomalomeuta remains unknown. Another possibility is functional segregation between the left and right valvae, with the gracillariid Phyllonorycter (subgenus Asymmetrivalva) representing a good example (Kuznetzov & Baryshnikova 2004). Interestingly, similar to Anomalomeuta, the male genitalia of Phyllonorycter, if asymmetric, usually have one valva larger than the other. Anomalomeuta possesses a narrower body and wings than other urodids that have symmetrical male genitalia. It would be interesting to test whether such differences affect copulation position and hence male genitalia symmetry.

    ACKNOWLEDGMENTS

    I would like to thank Dr. Erik J. van Nieukerken (Naturalis Biodiversity Center, Leiden, Netherlands) and two anonymous reviewers for critically editing the manuscript and Dr. Donald Davis (United States National Museum of Natural History, Smithsonian Institution, Washington, DC) for allowing me to examine specimens under his care and for reviewing an early draft of the manuscript. Financial support was provided by the U.S. National Science Foundation's Assembling the Tree of Life program, award number 0531769.

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    Jae-Cheon Sohn "A New Genus and Species of Urodidae (Lepidoptera: Urodoidea) from Argentina with the First Report of Asymmetric Male Genitalia in the Superfamily," Florida Entomologist 96(2), 469-476, (1 June 2013). https://doi.org/10.1653/024.096.0212
    Published: 1 June 2013
    KEYWORDS
    Anomalomeuta dondavisi sp. nov.
    Anomalomeuta gen. nov.
    Argentina
    Lepidoptera
    Taxonomía
    taxonomy
    Urodidae
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