Agrypnus (Sabikikorius) uidoensis Han and Park

Han, Tae Man, Sim, Ha Sik, Lee, Seunghwan & Park, Hae Chul, 2009, A new species Agrypnus (Sabikikorius) uidoensis sp. nov. (Coleoptera: Elateridae) from the Sand Dune Shore of Ui-do Island, Korea, Zootaxa 2134, pp. 60-68 : 64-66

Agrypnus (Sabikikorius) uidoensis Han and Park , sp. nov.

( Figs. 4–35 )

Specimens examined. Holotype: male, sand dune of Donmok beach on Ui-do Island, Dochoi-myeon, Jeollanam-do, Korea. 21. V. 2008. Hae Chul Park (Paratypes: 8 males and 14 females, same data as for holotype. Holotype and all paratypes deposited in NAAS.

Description. Holotype ( Figs. 5–6 ; male) 15.5mm long, 4.5 mm wide; body elongate-oval, parallel-sided, rather convex; color blackish brown, but antennae, maxillary palpi, and legs dusky reddish brown ( Figs. 5, 6 ); two kind of scale liked-hair densely covered, of which reddish brown hairs (rbh) bearing from large punctures and white gray hairs (wgh) bearing from small punctures (Fig. 17). Head (Fig. 9) shallowly impressed at longitudinal median region; carina above antennal socket well ridged, not reaching to frontal margin (Fig. 13); with ‘v’ shaped marking of white gray hairs (wgh) at vertex; eyes almost parallel sided (Fig. 10). Maxillary palpi axed shape (Fig. 14); Antennae short, reaching two-thirds length of pronotum; first antennomere large, stout, 2.46 times longer than wide; second antennomere cylindrical, 1.28 times longer than wide and 1.35 times longer than third one; third antennomere subobconic, 1.32 times longer than wide; fourth antennomere serrated (Fig. 11); 11th antennomere fusiform, slender, elongated, 1.90 times longer than wide (Fig. 15). Pronotum (Fig. 16) convex, dorsal-lateral portions slightly declivous; 1.07 times longer than wide, widest just before mid-length, but not wider than width of hind angles; longitudinal median furrow distinct beyond middle to posterior; lateral margin slightly arched, gradually narrow to anterior; base of hind angles weakly sinuate; hind angle broad at base, slightly divergent laterally, without carina, truncated at apex (Fig. 18). Prosternum (Fig. 19) convex, sinuate to base of antennal groove; anterior lobe rounded, more long than apex of hypomeron; prosternal process (Fig. 20) horizontal, gradually narrowing to apex, with long pubescence at apex; pronotosternal sutures forming deep groove to keep antennae; hypomeron broad, with distinct and deep groove for reception of fore tarsus, groove not reaching lateral margin, posterior margin almost straight. Scutellum (Fig. 21) subtrapezoidal, flattened, scale - like hairs densely covered, 1.17 times as long as wide; anterior margin parallel, narrower than lateral margins at middle; lateral margins strongly sinuate inwardly at one thirds of anterior; posterior margin rounded. Mesocoxal cavity surrounded by mesosternum and metasternum. Metasternum (Fig. 23) moderately convex at middle, with distinct tarsal grooves reaching to postero-lateral margins. Elytra convex, 2.26 times longer than wide, widest at one third and then gradually convergent to posterior; surface with punctuate striae, striae vestigial and indistinct (Fig. 22); intervals feebly convex. Sternite 7 (Fig. 24) semi-oval, 1.27 times as wide as long. Legs; hind femur as long as hind tibia; posterior half of 1st to 4th tarsal segments densely clothed with golden pubescence ventrally; claws simple, with two setae at base. Male genitalia ( Fig. 27–29 ) elongate, rather slender, weakly bent downward at midlength ( Fig. 28 ); median lobe slender, gradually narrow to apex, a little longer than parameres; paramere slender, gradually narrow to apex, slightly sinuate inwardly at middle, with lateral subapical barb expanded triangluarly; lateral subapical barb rather short, 1.36 times longer than wide ( Fig. 30 ), with several long setae on median region ventral, almost parallel-sided at base ( Fig. 31 ).

Female ( Figs. 7, 8 ). Length 17.52–19.10 mm, width 5.50–5.65 mm, generally larger than male; Antenna shorter than male, approximately reaching half-length of pronotum, forth antennomere more weakly serrated than male, 1.13–1.16 times as long as wide (Fig. 12); pronotum more convex than male and lateral margin more strongly arched; from posterior half of sternite 6 and sternite 7 with smooth elliptic region on median with small punctures without pubescence (Figs. 25, 26); ovipositor stout, lacking stylus ( Fig. 32 ), weakly bent downwardly near apex in profile ( Fig. 33 ); vagina ( Fig. 34 ) rather short; uterus greatly enlarged, with two colleterial glands; bursa copulatrix ( Fig. 35 ) stout, cylindrical, elongated, spiraled right, including two spiniferous rows, with a pair of small sclerotized plates at base.

Larva. Unknown

COI profile. We obtained a region data set of 686 nucleotides for five paratypes. No sequence divergence was detected at the infraspecific level. Base frequencies were: A = 27.1%, C = 25.4%, G = 18.5%, and T = 29.0%.

16S rDNA. We obtained a partial region data set of 965 bases for five paratypes of this novel species. Mean base frequencies were as follows: A = 42.4%, C = 19.7%, G = 9.7%, and T = 28.2%. Kimura 2-pairwise divergences within the new species ranged from 0.1% to 0.5%.

Distribution. Korea (Ui-do Island).

Biology. This species remains unknown for detailed biological information. We can only provide brief collecting information that they was caught during the day under some logs and driftage deposited on the beach ( Figs. 3, 4 ). Some individuals were collected by pitfall traps, with each trap containing a small amount of a mixture of 10 volumes of 100% ethyl alcohol and one volume of pupal broth extracted from Bombyx mori (L.); the traps were left overnight.

Etymology. This new species was named A. (S.) uidoensis based on its collection locality, Ui-do Island, Korea.

Notes. Within the region including Korea and Japan, this novel species closely resembles A. (S.) ryukyuensis Kishii 1985 from the Ryukyu Islands, Japan, in general appearance and body color. Agrypnus (S.) uidoensis sp. nov. has a distinctly carinate anterior margin of the hypomeral groove for reception of the fore tarsi, the prosternal process is extends straight in the posterior direction, the scutellum is more weakly inwardly concave, especially in male genitalia, the median lobe is slightly longer than the paramere, and the lateral margin of the subapical barb of the paramere is slightly inclined and almost parallel-sided at the base. In contrast, A. (S.) ryukyuensis has indistinct anterior margins of the hypomeral groove, the prosternal process is bent slightly inwardly behind the procoxal cavities, the scutellum is strongly concave inwardly, the median lobe of the male genitalia is equal in length to the paremere apex, and the lateral margin of the subapical barb of the paramere is more strongly inclined and clearly concave at the base. Agrypnus (S.) uidoensis is also separated from A. (S.) taciturnus and A. (S.) sauteri by general body color, the ratio of the length and width of the fourth antennomeres, and the differences in male genital shape as given above in the key. The molecular sequence data set of COI and 16S rDNA of mtDNA will be useful to search for the unknown larva, which is expected to have same genetic information with adult of this novel species, as well as in determining the relationship between congeners of Sabikikorius and status for further systematic study.

FIGURES 9–26. SEM images of A. (S.) uidoensis . 9: Head; 10: Eye in a dorsal view; 11: 2nd to 4th antennomeres, male; 12: Ditto, female; 13: Frontal view of the head; 14: Ventral view of the maxillary palpi; 15: 10th and 11th antennomeres, male; 16: Pronotum; 17: Hairlike scales on the disk of the pronotum; 18: Hind angle of the pronotum; 19: Ventral view of the prosternum; 20: Prosternal process in a ventral view; 21: Scutellum; 22: Elytral punctuates; 23: Metasternum; 24: 6th and 7th sternites, male; 25: Ditto, female; 26: The different puncture shape on the smooth elliptic region, female.

Figures

FIGURES 2 – 4. The type locality of A. (S.) uidoensis sp. nov., Donmok Beach, Ui-do Island, Shinan-gun, Korea. 2: Landscape of Donmok beach’s seashore; 3: Boundary between the tidal zone and the sand dune covered with rubbish deposited form the shore; 4: A male stalking on the sand.

FIGURES 5 – 8. Adults of A. (S.) uidoensis sp. nov., 5: Male holotype in a dorsal view; 6: Same as 5 in a ventral view; 7: Female in a dorsal view; 8: Same as 7 in a ventral view (scale bar, 10 mm)

FIGURES 27 – 35. Male genitalia and female reproductive organs of A. (S.) uidoensis sp. nov. 27: Aedeagus in a dorsal view; 28: Ditto in a profile view: 29: Ditto in a ventral view; 30: Apex region of the paramere in a dorsal view; 31: Ditto in a ventral view; 32: Ovipositor in a dorsal view; 33: Ditto in a profile view; 34: Female reproductive organs in a ventral view (BC: bursa copulatrix; Acgl: Accessory gland); 35: Bursa copulatrix in a ventral view.