Sparedrus koreanus Lee, Kim, Lee & Ruzzier, 2025

Lee, Min Hyeuk, Kim, Dongmin, Lee, Seunghyun & Ruzzier, Enrico, 2025, New report of Calopodinae (Coleoptera, Oedemeridae) in South Korea, with description of a new species of the genus Sparedrus Dejean, 1821, Biodiversity Data Journal 13, pp. e 161171-e 161171 : e161171-

Sparedrus koreanus Lee, Kim, Lee & Ruzzier sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: Dongmin Kim; sex: 1 male; lifeStage: adult; occurrenceID: 38F61A1F-4CE2-552F-8C33-6E4F3A092E03; Taxon: scientificName: Sparedrus koreanus sp. nov.; family: Oedemeridae ; Location: country: Korea; countryCode: KR; stateProvince: Daegu; county: Buk-gu; locality: Dongbyeon-dong ; decimalLatitude: 35.918648; decimalLongitude: 128.607917; geodeticDatum: WGS 84; Event: year: 2024; month: 4; day: 8

Type status: Paratype. Occurrence: recordedBy: Dongmin Kim; sex: 1 female; lifeStage: adult; occurrenceID: A9FACFE0-620C-5A73-A26E-70AA6B3BE645; Taxon: scientificName: Sparedrus koreanus sp. nov.; family: Oedemeridae ; Location: country: Korea; countryCode: KR; stateProvince: Daegu; county: Buk-gu; locality: Dongbyeon-dong ; decimalLatitude: 35.918648; decimalLongitude: 128.607917; geodeticDatum: WGS 84; Event: year: 2024; month: 4; day: 8

Type status: Paratype. Occurrence: recordedBy: Dongmin Kim; sex: 1 male; lifeStage: adult; occurrenceID: C6957160-440E-5202-AC57-A27C81C8FE75; Taxon: scientificName: Sparedrus koreanus sp. nov.; family: Oedemeridae ; Location: country: Korea; countryCode: KR; stateProvince: Daegu; county: Buk-gu; locality: Dongbyeon-dong ; decimalLatitude: 35.918648; decimalLongitude: 128.607917; geodeticDatum: WGS 84; Event: year: 2024; month: 4; day: 10

Type status: Paratype. Occurrence: recordedBy: Dongmin Kim; sex: 2 males, 1 female; lifeStage: adult; occurrenceID: 64E9B531-660B-5C41-9E37-5B54264EACB4; Taxon: scientificName: Sparedrus koreanus sp. nov.; family: Oedemeridae ; Location: country: Korea; countryCode: KR; stateProvince: Daegu; county: Buk-gu; locality: Dongbyeon-dong ; decimalLatitude: 35.918648; decimalLongitude: 128.607917; geodeticDatum: WGS 84; Event: year: 2024; month: 4; day: 11

Type status: Paratype. Occurrence: recordedBy: Dongmin Kim; sex: 2 males, 2 females; lifeStage: adult; occurrenceID: DC19D9E7-4CCC-5407-8979-AE2098532294; Taxon: scientificName: Sparedrus koreanus sp. nov.; family: Oedemeridae ; Location: country: Korea; countryCode: KR; stateProvince: Daegu; county: Buk-gu; locality: Dongbyeon-dong ; decimalLatitude: 35.918648; decimalLongitude: 128.607917; geodeticDatum: WGS 84; Event: year: 2024; month: 4; day: 1

Description

Holotype (male). Body length 15.6 mm, about 4.5 times of width of elytral humeri; elongated and subparallel; reddish-brown with dense yellowish pubescence (Fig. 1 A and B).

Head. Prognathous; eyes large, laterally protruding, almost merging at the middle in dorsal view; head across eyes moderately wider than pronotum, widest width of head about 1.2 times pronotum; antennal insertions exposed from above; antennae 11 - segmented, strongly exceeding elytral apex, about 1.15-1.3 times of body lengths; ratio of each antennomere 5.42: 1: 6.83: 7.63: 8.01: 7.98: 7.84: 7.19: 7.16: 7.39: 9.72; antennomere 2 minute; antennomere 3 almost 6.8 times as long as antennomere 2; antennomeres 4-10 more or less serrate with protruding posterior lateroapical corner of each segment; antennomere 11 simple, flattened and slightly curved, almost twice that of antennomere 1; mandibles unidentate, simple at apex; apical maxillary palpomere strongly expanded and securiform, fossula sensualis reaching from apex to basal 1 / 3; apical maxillary palpomere approximately 2.3 times wider at widest than base (Fig. 1 E, F).

Thorax. Pronotum almost as long as wide, subcylindrical; scutellum small and indistinct; elytra elongated, covering the entire abdomen, parallel-sided, 3.32 times that of combined width, almost 2 / 3 of antennae; moderately narrowing posteriorly from about two-thirds; some parts of elytra lack punctures and setae, appearing as tiny spots. Legs long and slender; tibiae not widened apically, with two apical spurs; tarsi 5-5 - 4, with 2 nd and 3 rd segments expanded from the apex, 1 st segment of hind tarsi more elongated, almost 1 / 3 of hind tibia; claws simple.

Abdomen. Abdomen consists of five visible ventrites; ventrite 5 emarginate at both sides of the terminal part (Fig. 1 G). 8 th and 9 th abdominal sternites and male genital structure as figured (Fig. 1 H-J). Tergite VIII well emarginated with spiculum gastrale; tergite IX almost divided into two parts, densely set with setae at the apex. Tegmen moderately sclerotised, shorter than aedeagus, with short setae apically; aedeagus long, straight, with basal processes.

Male paratypes. Generally similar to holotype, but showing minor variation in size and proportions: body length 11.0- 14.9 mm; ocular index 4.3-7.6; ratio of each antennomere 4.1-5.6: 1: 6.0 - 7.7: 6.5 - 8.9: 6.4 - 9.0: 6.8 - 9.5: 6.6 - 9.3: 6.5 - 9.1: 6.6 - 9.2: 6.6 - 9.1: 9.0 - 12.2; elytra 3.4–3.5 times as long as width.

Female paratypes (Fig. 1 C, D). Body lengths 14.4 (13.4-15.8) mm, about 4.2 times of width of elytral humeri; eyes small, more separated at the middle, ocular index 16.2-18.2; head across eyes slightly wider than pronotum, widest width of head about 1.04-1.05 times that of pronotum. Antennae shorter, reaching the middle part of the elytra, slightly exceeding half the body length; average ratio of each antennomere 3.8-4.2: 1: 4.1 - 4.4: 3.5 - 3.7: 3.6 - 3.8: 3.6 - 3.7: 3.4 - 3.5: 3.2 - 3.4: 3.2 - 3.4: 2.9 - 3.3: 4.6 - 4.9; antennomere 11 subequal with antennomere 1, but slightly longer; fossula sensualis reaching from apex to basal half. Terminal part of abdomen not emarginated. Female genitalia as figured (Fig. 1 K, L).

Diagnosis

Sparedrus koreanus sp. nov. can be easily distinguished from the other Sparedrus species, except for S. karenorum Švihla by the securiform shape of apical maxillary palpomere.

This new species differs from S. karenorum Švihla by the following characters: the frons is narrower than the width of antennomere 1 and the length of the antennae distinctly exceeds the body length.

Etymology

The specific epithet " koreanus " refers to the country of its discovery, South Korea.

Notes

All specimens were found under LED lights during a riverside stroll (Fig. 2 ).

Figures

Figure 1. Sparedus koreanus. A Dorsal habitus, male (holotype); B Ventral habitus, male (holotype); C Dorsal habitus, female (paratype) D Ventral habitus, female (paratype) E Male head F Male maxillary palp; G Male 5 th ventrite; H-I Tegmen; J Aedeagus; K Female genitalia; L Female genitalia (enlarged); M Phylogenetic relationship within Calopodinae, based on COI; N Preliminary phylogenetic tree of Oedemeridae.

Figure 2. A General view of the collecting site and female at the collection locality (inner circle); B Living adult of Sparedrus koreanus.