Notodoma koreanum Seung, Lee, Lee & Lee, 2024, sp. n.
Creators: name: Seung, Jinbae
name: Lee, Seunghyun
name: Lee, Minhyeuk
name: Lee, Seunghwan
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Histeridae
Notodoma
Notodoma koreanum

description: Notodoma koreanum sp. n. (Figure 2–3)
(Korean name: Go-ryeo-ju-hwang-gin-da-ri-pung-deng-i-boot-i)
Description. Body (Figs.2A–D) 2.5–4.1 mm long and 2.3–3.6 mm wide; globose, strongly convex; mostly reddish brown with yellow maculae on elytral base; surface strongly glossy. Head (Fig. 2E) evenly punctate, fairly larger at posterior part, average distance between punctures about two times greater than its diameter, rather sparser and finer marginally; frontal stria well-impressed, W-shaped, shortly interrupted at middle; epistome hexagonal, straight at apex; labrum broadly arcuate; mandible long, abruptly pointed and curved inward near apex. Pronotum wide, convex, almost inverted pentagonal, slightly bi-emarginate at anterior margin, weakly protruded medio-posterad at base; marginal pronotal stria complete; surface evenly covered with fine punctures, average distance between punctures about three times greater than its diameter, rather larger and coarser laterally; with broad and weak depression behind anterior angle along lateral margin. Scutellum small, triangular. Elytra (Fig. 2I) convex; surface wholly and evenly covered with microscopic punctures, finer and sparser than those of pronotum; epipleural marginal stria complete and crenulate; elytral marginal stria complete and crenulate, with an additional crenulated stria with a row of punctures at middle just above elytral marginal stria; outer subhumeral stria present from basal one-fourth, extending along apical margin of elytron and united with the end of sutural stria; dorsal striae 1, 2, 4 complete; dorsal stria 3 present rudimentary, weakly impressed on basal one-third, mostly obsolete; dorsal stria 5 absent; sutural stria complete, basal end almost united with the basal end of stria 4, narrowly interrupted, apical end united with apical end of outer subhumeral stria. Propygidium broad, strongly convex; surface evenly punctate, average distance between punctures about three times greater than its diameter, slightly denser marginally. Pygidium (Fig. 2F) more densely punctate than those of propygidium, average distance between punctures about two times greater than its diameter. Prosternum (Fig. 2G) wide, broadly rounded at anterior margin; marginal stria complete; surface covered regular-sized punctures on anterior half, fairly larger and coarser posterior region excepting prosternal keel; prosternal keel broad, with a pair of distinct and parallel striae on each side, deeply emarginated at apex. Mesoventrite (Fig. 2H) distinctly bisinuate at anterior margin; surface punctate as prosternum; mesoventral marginal stria complete, weakly crenulate; secondary marginal stria present between mesoventral marginal stria and antero-lateral angles of mesoventrite, broadly interrupted at middle; meso-metaventral suture impressed, barely crenulate. Metaventrite (Fig. 2H) broad, trapezoidal; surface covered with irregular-sized punctures, rather finer and denser at intercoxal disc of metaventrite; intercoxal disc of metaventrite with a pair of oblique striae, extending from each anterior angle of metacoxae, converging at basal four-fifths of median longitudinal suture; lateral disc covered with large and coarse punctures, gradually larger outwardly. Abdomen composed with five visible ventrites; intercoxal disc of abdominal ventrite 1 punctate as metaventrite, larger and sparser laterally, with a pair of complete and crenulate striae on each side; ventrites 2–5 barely visible, each apical margin closely overlapped. Legs slender; protibia (Fig. 2J) with 11 small denticles on outer margin, with a deep and straight tarsal groove. Male genitalia shown as Figures 2K–P; ratio in length of paramere to basal piece of aedeagus about 0.4. Female genitalia shown as Figures 3Q–S.
Type material. HOLOTYPE. Male. Republic of Korea, Gyorae-ri, Jocheon-eup, Jeju-si, Jeju-island, 22.V.2021, Seung leg., collected from Bjerkandera adusta (Willd.) P. Karst. (SNU). PARATYPE. Jeju Island: 3 individuals, Republic of Korea, Seogwipo Recreational Forest, Daepo-dong, Seogwipo-si, Jeju-island, 11. VI.2016, Seung et al. leg., collected from thick mycelium on dead tree (SNU); 2 males and 2 females, Republic of Korea, Gyorae-ri, Jocheon-eup, Jeju-si, Jeju-island, 22. V.2021, Seung leg., collected from Bjerkandera adusta (Willd.) P. Karst. (SNU); 1 male and 2 females, Republic of Korea, Gyorae-ri, Jocheon-eup, Jeju-si, Jeju-island, 19. VI.2021, Seung leg., collected from Inonotus mikadoi (Lloyd) Imaz. (SNU). Peninsula: 1 female, Republic of Korea, Yongam-ri, Byeolnae-myeon, Namyangju-si, Gyeonggi province, 12.VII.2018, Seung et al. leg., collected from thick mycelium on dead tree (SNU).
Distribution. Korea (Peninsula, Jeju Is.)
Remarks. Notodoma koreanum can be easily distinguished from another Korean species, N. fungorum, by oblique striae on intercoxal disc of metaventrite. Its converged ends of the striae reach about four-fifths of median longitudinal suture of metaventrite in koreanum, while converged ends attain three-fifths in N. fungorum. Also, distinct W-shaped frontal stria differentiates koreanum from the latter species. In the aspect of oblique striae of metaventrite, N. koreanum is closely related to two Southeast Asian species, N. rufulum and N. solstitiale. However, secondary marginal striae of mesoventrite is shortly present in koreanum, while the latter two species lack this structure.
This species is mainly distributed on Jeju-Island in Korea and occasionally observed together with N. fungorum. Several individuals were observed on some fungi: Bjerkandera adusta (Willd.) P. Karst. colonized by various dipteran and coleopteran species (e.g. Erotylidae and Tenebrionidae); Inonotus mikadoi (Lloyd) Imaz. colonized by some coleopteran groups (e.g. Ciidae, Erotylidae, and Tenebrionidae); white thick fungal mycelium with various insects. They seem to mainly feed on the small eggs and larvae of other insects, as well as fungal tissue once in a while.
description: Published as part of Seung, Jinbae, Lee, Seunghyun, Lee, Minhyeuk & Lee, Seunghwan, 2024, A new species of the genus Notodoma Lacordaire, 1854 (Coleoptera, Histeridae, Exosternini) from Korea, with a revised key to species of the genus, pp. 143-150 in Zootaxa 5519 (1) on pages 147-149, DOI: 10.11646/zootaxa.5519.1.8, http://zenodo.org/record/13915646