taxonID	type	description	language	source
A00AC1D9AC6150D1993BD9F47D652A8F.taxon	description	Figs 1 – 8, 13, 14, 17, 19, 20, 23 – 34, 41 – 51	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
A00AC1D9AC6150D1993BD9F47D652A8F.taxon	diagnosis	Diagnosis. See under Yufengus above.	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
A00AC1D9AC6150D1993BD9F47D652A8F.taxon	description	Description. Male (Figs 1 – 8, 13, 14, 17). Head: frons hairy, brown with yellow scaling; eyes semioval, black; antenna bipectinate from base to apex, medial side of antenna protrusions shorter than the lateral side; labial palpus upcurved with the apex pointing dorsally, covering dark brown scales dorsally and yellow scales ventrally, with the 3 rd segment longer than 1 / 3 of 2 nd segment (Fig. 14); proboscis present (Fig. 13). Thorax: dark brown, with long, yellow hairs laterally and posteriorly near abdomen; legs brown, banded with yellow on tarsi (Fig. 7), midleg with one pair of tibial spurs, hindleg with two pairs of tibial spurs, each pair of unequal length (Fig. 8). Forewing: 8.16 – 8.79 mm long (x ̄: 8.44 ± 0.32 mm, n = 3). Upperside ground color dark brown, a reddish-brown spot surrounded by black at apex, three black patches on discal cell, discal area, and postdiscal area. Four white spots from inner margin to discal cell (latter two sometimes invisible) (Figs 1, 3), fringe with dark-brown scales. Underside ground color dark brown, broadly pale grey along inner margin, a reddish-brown spot surrounded by black at apex. Forewing venation: Rs 2 and Rs 3 on common branch originating from Rs 1 near discal cell; Rs 4 originating from discal cell; MS bisecting discal cell; 1 A + 2 A with basal fork. Hindwing: upperside dark brown; fringe with contrasting pale-yellow scales, becoming mostly black near tornus. Underside similar to upperside. Hindwing venation: MS present in discal cell; a very short cross vein between R and RS at the proximal third of the wing, inside the discal cell; RS and M 1 meet at outer end of discal cell; CuP, 1 A + 2 A, and 3 A present as typical in Limacodidae. Abdomen: dark-brown dorsum, yellow in posterior half of ventrum. Female (Figs 5, 6, 50, 51). Similar to male, but larger (forewing 11.14 mm long, from base to apex); antenna filiform; ground color of wing brown, hindwing with a small dark-brown spot at apex, fringe of hindwing brown with dark scales throughout; the 5 th tarsomere with a triangular, recessed pad bearing sensilla and spinules (Fig. 51); abdomen brown ventrally. Male genitalia (Fig. 19). Uncus narrow throughout and curved slightly downward at apex. Gnathos absent. Tegumen and vinculum wider than the uncus. Juxta roughly triangular, slightly sclerotized, and setose. Valva elongate, round at apex and with short hairs on inner surface and slightly narrow at base; medial portion with sclerotized process with distal sawteeth. Saccus short. Phallus straight, tubular. Female genitalia (Fig. 20). Papillae anales flat, drop-shaped; anterior apophyses short, digitate, posterior apophyses about two times as long as anterior apophyses. Ductus burse membranous and straight. Corpus bursae ovate, about two-thirds length of ductus burse; signum with spines: two large and a few small ones. Immature stages (Figs 23 – 34, 41 – 49). Egg (Fig. 23): flat oval, 1.92 – 2.00 mm in long axis (1.97 ± 0.05 mm, n = 3) and 1.22 – 1.30 mm in short axis (1.26 ± 0.04 mm, n = 3). First instar larva (Fig. 24): yellow ground-colored body with broken orange stripes on mid-dorsum and dorsolateral lines. Prothorax (T 1) without tubercles and T 2 and T 3 each have three tubercles on each side, one D tubercle on A 1, two tubercles — D and SD — on A 2 – A 9; each tubercle has three setae. Two L setae on each segment. Early to mid-instar larvae (Figs 25 – 28): ground color of body yellow to white; some individuals with black patches on the range of T 3 – A 1 and A 3 – A 5 (Fig. 26); some individuals in the stage before the final instar (Fig. 28) with the slightly visible color of the final instar. Final instar larva (Figs 29 – 32): 12.10 – 12.48 mm in length (12.3 ± 0.19 mm without spine length, n = 3), 4.93 – 6.69 mm in width of A 3 (5.93 ± 0.9 mm without spine length, n = 3). Head dark brown; labrum with multiple spinules anteriorly and laterally (Fig. 42); stemmata with gaps of approximately the width of a stemma between stemma 1 and stemma 2, and between stemma 5 and stemma 6 (Fig. 43); has only one seta (encircled by stemmata); spinneret brush-like with apex tapered (Fig. 44). Body slug-like, ground color black. Prothorax (T 1) white with no tubercles; mesothorax (T 2) with two single black D tubercles, one single black SD tubercle, and two short white L tubercles; metathorax (T 3) with a branched D tubercle (two black branched parts on a quadripartite base, Fig. 32), and two single black SD tubercles, and two short white L tubercles. First abdominal segment (A 1) with only a branched D tubercle. Abdominal segments with same D tubercles as A 2 – A 8 as A 1 but have one single black SD tubercle on each segment, two short white outgrowths for L of A 2 – A 8. The longest D tubercle is on A 4 and there are red patches on the tubercle apices of A 5 – A 8, especially distinct on A 6 and A 7; one long tubercle for D and one white tubercle for L of A 9. All tubercles bear numerous plumose setae (Fig. 46) and a single long bristle with tactile function, and those for D and SD can be easily detached when touched. The pretarsal claw of the thoracic leg (Fig. 45) is wide proximally, hook-like distally, with hair-like setae. Cocoon (Figs 33, 34): spheroid, 8.36 – 6.80 mm in long axis (7.57 ± 0.78 mm, n = 3) and 6.96 – 5.63 mm in short axis (6.19 ± 0.69 mm, n = 3), brown, with silk blending setae of final instar and forming a thin outer membrane. Pupa (Figs 47 – 49): thin cuticle, pupal eyepiece with a fracture line, maxilla without maxillary extension, pupal frons rough and shagreened, dorsum of abdominal segments with patch of spicules along anterior margin.	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
A00AC1D9AC6150D1993BD9F47D652A8F.taxon	etymology	Etymology. The specific name atrophaneuroides is derived from the swallowtail genus Atrophaneura Reakirt (Papillionidae) and the Latin suffix - oides, which means “ - like ”, because the black and red outgrowths of the final instar is reminiscent of Atrophaneura larvae. The species epithet is a compound descriptive name comprising an adjective combination with the ending of the second name in masculine form to agree in gender with the generic name.	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
A00AC1D9AC6150D1993BD9F47D652A8F.taxon	distribution	Distribution. Yufengus atrophaneuroides is usually found from montane areas at low altitude in Taiwan.	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
CF062DA8F0D753C188597AAD62BFE05B.taxon	type_taxon	Type species. Yufengus atrophaneuroides sp. nov. (here designated).	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
CF062DA8F0D753C188597AAD62BFE05B.taxon	diagnosis	Diagnosis. No known adults or larvae of Limacodidae from Asia are similar in general appearance to Yufengus. Structurally they are most comparable to Phrixolepia as larvae (Figs 36 – 39, 52 – 56) and adults (Figs 57, 58), although adult Phrixolepia forewing lacks the distinct white forewing spots and dark subapical marking on ventral surface (Figs 9 – 12), have male filiform (Fig. 15) rather than bipectinate antenna (Fig. 13), have Rs 4 originating beyond discal cell (Fig. 18) rather than from discal cell, have gnathos present (Fig. 21) rather than absent, have coiled ductus bursae (Fig. 22) rather than straight, and the labial palp 3 rd segment is much shorter compared to 2 nd segment compared to Yufengus (Fig. 16) (Note: the description of Yufengus is found below under Y. atrophaneuroides).	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
CF062DA8F0D753C188597AAD62BFE05B.taxon	etymology	Etymology. The genus is named after Dr Yu-Feng Hsu, the advisor of the first two authors, who has provided support and encouragement for limacodid studies over the past 10 years.	en	Lin, Yu-Chi, Lin, Rung-Juen, Epstein, Marc E. (2025): Description and life history of a new genus and species of Limacodidae (Lepidoptera, Zygaenoidea) from Taiwan, the first with a monkey-slug-like caterpillar from outside the New World. ZooKeys 1261: 1-15, DOI: 10.3897/zookeys.1261.155406
