Dorcus titanus castanicolor (Motschulsky, 1861)

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 View Figure 6 ). The head shows asymmetrical dimorphism, with the left side resembling a male and the right side resembling a female (Fig. 7 View Figure 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 View Figure 7 ). The mandibles are asymmetrical, with the left side more developed. The left antenna is slightly larger (Fig. 7 View Figure 7 ). In the central area of the left side of the pronotum, male-type punctures appear in a patchy pattern (Fig. 7 View Figure 7 ). The legs exhibit only female characteristics (short, with a rather wide protibia) (Fig. 6 View Figure 6 ). The genitalia are fully developed and identical to a typical ovipositor (Fig. 8 View Figure 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 View Figure 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 View Figure 6 , 7 View Figure 7 , 8 View Figure 8 ). Hence, this specimen was classified as a gynandromorph. This is the first record for this subspecies.