Sicciaemorpha ivyalba van Eecke, 1920

Volynkin, Anton V. & Černý, Karel, 2021, Taxonomic review of the genus Sicciaemorpha van Eecke (Lepidoptera Erebidae: Arctiinae), with descriptions of six new species from Malaysia and the Philippines, Zootaxa 4985 (1), pp. 69-80 : 71

Sicciaemorpha ivyalba van Eecke, 1920

( Figs 1, 2 , 15 , 22 )

Sicciaemorpha i. v. y.-alba van Eecke, 1920, Zoologische mededeelingen, 5, 129, fig. 13 (Type locality: [ Indonesia] “ Preanger (5000 vt.), W. Java ”) .

Type material examined. Lectotype (hereby designated) ( Figs 1 , 15 ): male, “W. Java | Preanger | 5000 vt. | Sijthoff ♂ ” / “ Museum Leiden | Siccia | i. v. y. alba | Det.: v-E. ♂.” / “ Type ” / “Cat. № 2” / blue stripe-like label / QR-code label with a unique number “ RMNH. INS 1148736 ”, gen. prep. No.: RMNH. INS 1148736 (prepared by Volynkin) ( RMNH).

Paralectotypes: 1 male, “W. Java | Preanger | 5000 vt. | Sijthoff ♂ ” / “ Museum Leiden | Siccia | i. v. y. alba | Det. : v-E. ♂.” / “ Type ” / “ Cat. № 1” / blue stripe-like label / QR-code label with a unique number “ RMNH. INS 1298158 ” ( RMNH) ; 1 female ( Figs 2 , 22 ), “W. Java | Preanger | 5000 vt. | Anthony f#” / “ Museum Leiden | Siccia | i. v. y. alba | Det. : v-E. f#.” / “ Type ” / “ Cat. № 4” / blue stripe-like label / QR-code label with a unique number “ RMNH. INS 1148737 ”, gen. prep. No. : RMNH. INS 1148737 (prepared by Volynkin) ( RMNH) ; 1 male, “W. Java | Preanger | 5000 vt. | Anthony ♂ ” / “ Museum Leiden | Siccia | i. v. y. alba | Det. : v-E. ♂.” / “ Type ” / “ Cat. № 3” / blue stripe-like label / QR-code label with a unique number “ RMNH. INS 1298159 ” ( RMNH) .

Diagnosis. The forewing length is 10.5 mm in males and 10 mm in female. The species is easily distinguishable from other congeners by its forewing with the subapically convex costal margin, the pale ochreous forewing coloration with a strong brown suffusion in the medial and subterminal areas, and the terminal line interrupted into a complete row of distinct dark brown dots between the veins (whereas in other species it is present as a row of three spots or (in S. yumun sp. n.) as a row of diffuse small brown dots. The male genital capsule of S. ivyalba is unmistakable due to the large, club-shaped ventro-distal process of the valva which is positioned ventrally, longer and wider than the distal membranous lobe of the valva and bears a dense row of robust setae on the distal round margin. Additionally, the male genital capsule of S. ivyalba differs from those of the congeners by the relatively short, straight, thorn-shaped costal process, the heavily sclerotized and curved ventral protrusion of the costa (it is more straight and weakly sclerotized in the congeners), and the short (in comparison to the length of the valva) but basally dilated distal saccular process with a claw-like tip (it is more elongate and less dilated basally in the congeners). The aedeagus of S. ivyalba is similar to those of S. yumun sp. n. and S. langgona sp. n., but the coecum is more curved. The female genitalia of S. ivyalba differ from those of other congeners (when known) by the very wide (ca. 1/3 of the width of the 7 th sternite) ventro-lateral pockets of the 7 th sternite having smooth margins, and the short (taking somewhat less than 1/2 of the length of the aedeagus) and narrow (no wider than the ductus bursae) antrum.

Distribution. Known only from Java Island ( Indonesia).

Figures

FIGURES 1–8. Sicciaemorpha spp.: adults. Depositories of the specimens: 1 and 2 in RMNH; 3 and 5–8 in MWM/ZSM; 4 in CKC.

FIGURES 15–18. Sicciaemorpha spp.: male genitalia. Depositories of the specimens dissected: 15 in RMNH; 16–18 in MWM/ ZSM.

FIGURES 22–27. Sicciaemorpha spp.: female genitalia. Depositories of the specimens dissected: 22 in RMNH; 23, 25 and 27 in CKC; 24 and 26 in MWM/ZSM.