Hamiamia Brown, 2024

Brown, John W., 2024, New genera and species of tortricid moths from Chile and Argentina (Lepidoptera: Tortricidae), Zootaxa 5551 (1), pp. 51-90 : 58-59

Hamiamia Brown , new genus

LSIDurn:lsid:zoobank.org:act: 75D286D6-5CDB-48F1-8ECF-1B3607C6CA58

Type species: Varifula trancasiana Razowski & Pelz, 2010 .

Remarks and Diagnosis. Originally described in Varifula , H. trancasiana , the type species of Hamiamia , has little in common with V. fulvaria ( Blanchard, 1852) , the type and only other species formerly in the Varifula . Superficially, H. trancasiana is easily distinguished from all other Euliina by forewing maculation, which features a bold pattern of alternating brown and white fascia ( Fig. 6 ). In contrast, Varifula fulvaria is a yellowish tan, much larger species ( Fig. 7 ), with a longer and narrower forewing. Even in their original description of H. trancasiana, Razowski and Pelz (2010) commented “Externally it strongly differs from the type species of this genus ( fulvaria )…” Because H. trancasiana was described from a single female, it is easy to understand it's incorrect generic assignment; its female genitalia are similar to those of V. fulvaria in certain aspects of the sterigma. However, the discovery of the male of H. trancasiana now indicates that a new genus is required for this species.

In addition to the unique facies, the paired hami in the male genitalia provide further evidence that H. trancasiana belongs in no other euliine genus. These unusual structures (i.e., hami) are known primarily in the subfamily Chlidanotinae , and are large and conspicuous in the male genitalia of H. trancasiana . Although also present in the euliine genus Hynhamia Razowski , the two genera have little else in common.

Description. Head: Vertex rough-scaled, with scales directed anteriorly, a pair of somewhat fan-shaped scale patches subdorsally at posterior margin of head; scales of upper frons rough, scales of lower frons shorter, more appressed to surface of frons; antenna ca. 0.5 length of forewing, conspicuously serrate, with one row of scales per flagellomere, sensory setae ca. 1.1 times width of flagellomere in male, shorter and sparser in female; ocellus well developed; chaetosemata well developed; labial palpus with scaling expanded distally on second segment, nearly concealing third segment, combined length of all segments ca. 1.5 times diameter of compound eye.

Thorax: Dorsum smooth-scaled, metathoracic tuft present. Legs unmodified, without hairpencil or other male secondary scales. Forewing length ca. 2.3 times width, slightly expanded apically; costa slightly and evenly arched throughout, male costal fold absent; termen straight, slightly oblique; all veins present and separate, chorda absent, M-stem present, R 4 to costa, R 5 to termen. Hindwing with all veins present and separate; CuP weak at margin; frenulum with one bristle in male, three in female.

Abdomen: Male genitalia ( Fig. 24 ) with tegumen moderately broad, with somewhat angled “shoulders” near attachment of gnathos; vinculum simple, V-shaped; uncus long, rod-like, from subtriangular dilation of dorsum of tegumen, somewhat flattened laterally in apical 0.5; socius absent; hami nearly as long as gnathos arms, strongly sclerotized, originating from swollen base of uncus; gnathos long, strongly sclerotized, joined distally into long median process with slightly upcurved apex, lacking spines; transtilla with large, median, rectangular plate, lacking spines; valva comparatively narrow, attenuate distally, costa weakly undulate, sacculus simple, restricted to basal 0.5 of venter of valva; juxta an irregularly shaped plate; phallus ca. as long as valva, narrow, weakly curved, vesica with a single long, aciculate, non-deciduous cornutus, as long as phallus.

Female genitalia ( Fig. 43 ) with papilla analis broad, ca. 2.5 times as long as wide, with setae conspicuous from small, well-defined papillae; apophyses slender, anteriores ca. equal in length to posteriores; sterigma simple, with weakly sclerotized band at anterior margin, ostium large; ductus bursae short, membranous; corpus bursae subovoidal, with large rounded expansion on right side near middle, corpus bursae attenuating anteriorly to a long, narrow, pointed, tail-like portion; a narrow sclerite along left side of corpus bursae extending from near junction with ductus bursae, tapering anteriorly.

Etymology. The generic name refers to the unusual presence of hami in the male genitalia.

Figures

FIGURES 1‒8.Adults of tortricid species from Chile andArgentina.1. Argentiliana basipallidana, paratype female. 2. Terifrona fronteria, holotype male. 3. Transtilliana biloba, paratype male. 4. Transtilliana biloba, paratype male. 5. Vargasia karsholti, holotype male. 6. Hamiamia trancasiana, Chile, Ñuble Province. 7. Varifula fulvaria, Chile, Aconcagua Province. 8. Varifula geomops, holotype male.

FIGURES 21‒28. Male genitalia of tortricid species from Chile and Argentina. 21. Terifrona fronteria, USNM slide 145,517. 22. Transtilliana biloba, USNM slide 154,846. 23. Vargasia karsholti, Horak slide GP 733. 24. Hamiamia trancasiana, USNM slide 92,490. 25. Varifula fulvaria, USNM slide 154,848. 26. Varifula geomops, USNM slide 68,492. 27. Proeulia hasta, furca attached to phallus, USNM slide 154,802. 28. Proeulia hasta, furca in situ, USNM slide 81,233.

FIGURES 39‒44. Female genitalia of tortricid species from Chile and Argentina. 39. Argentiliana basipallida, USNM slide 154,800. 40. Terifrona fronteria, USNM slide 145,518. 41. Transtilliana biloba, USNM slide 154,847. 42. Vargasia karsholti, JWBrown slide 1216. 43. Hamiamia trancasiana, USNM slide 92491. 44. Varifula fulvaria, USNM slide 88,471.