Dorcus titanus subsp. castanicolor
Creators: name: Kim, Donguk
name: Hyun, Sangeun
name: Choi, Kwang Shik
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Lucanidae
Dorcus
Dorcus titanus
Dorcus titanus castanicolor

description: Dorcus titanus castanicolor
Materials
Type status: Other material. Occurrence: sex: 1 gynandromorph; occurrenceID: 09268E7D-25D3-5F13-A399-753809D0B384; Taxon: genus: Dorcus; specificEpithet: titanus castanicolor; scientificNameAuthorship: (Motschulsky, 1861); Location: country: South Korea; locality: Hyeongsu Kim leg.; Event: eventDate: VII.2019 (breed); Record Level: basisOfRecord: Preserved Specimen
Type status: Other material. Occurrence: sex: 1 female; occurrenceID: 9E55012A-86F6-5022-A53D-93EF9D0DF949; Taxon: genus: Dorcus; specificEpithet: titanus castanicolor; scientificNameAuthorship: (Motschulsky, 1861); Location: country: South Korea; stateProvince: Chungcheongbuk-do; locality: Chupungryeong, Chupungryeong-myeon, Yeongdong-gun, Seung Mo Lee Coll.; Event: eventDate: 29.VII.1972; Record Level: basisOfRecord: Preserved Specimen
Type status: Other material. Occurrence: sex: 1 male, 1 female; occurrenceID: 95F2493E-FB09-5626-8E45-ECAC995F39D8; Taxon: genus: Dorcus; specificEpithet: titanus castanicolor; scientificNameAuthorship: (Motschulsky, 1861); Location: country: South Korea; stateProvince: Jeollanam-do; locality: Is. Jindo, Jukrim-ri, Imhoe-myeon, Jindo-gun, Donguk Kim leg.; Event: eventDate: 4.VIII.2020; Record Level: basisOfRecord: Preserved Specimen
Description
Morphology of the gynandromorph Dorcus titanus castanicolor
The body primarily exhibits female traits (Fig. 6). The head shows asymmetrical dimorphism, with the left side resembling a male and the right side resembling a female (Fig. 7). The surface of the head appears irregular, featuring patchy punctures. Male-type punctures are predominantly located on the left side, while female-type punctures are predominantly located on the right (Fig. 7). The mandibles are asymmetrical, with the left side more developed. The left antenna is slightly larger (Fig. 7). In the central area of the left side of the pronotum, male-type punctures appear in a patchy pattern (Fig. 7). The legs exhibit only female characteristics (short, with a rather wide protibia) (Fig. 6). The genitalia are fully developed and identical to a typical ovipositor (Fig. 8).
Notes
In D. titanus castanicolor, the prominent male sexual characteristics include well-developed mandibles, a non-projected canthus, a subrectangular pronotum and relatively long tarsi (Fig. 6). In the observed specimen, most body traits, including the legs and genitalia, exhibited female morphological characteristics. However, irregular patches of both male-type and female-type punctures were noted on the head and pronotum (Figs 6, 7, 8). Hence, this specimen was classified as a gynandromorph. This is the first record for this subspecies.
description: Published as part of Kim, Donguk, Hyun, Sangeun & Choi, Kwang Shik, 2025, First report of an intersex individual of the click beetle Pectocera fortunei (Elateridae) and additional cases of gynandromorphism in Coleoptera (Lucanidae, Scarabaeidae), pp. e 144929 in Biodiversity Data Journal 13 on page e144929, DOI: 10.3897/BDJ.13.e144929