Ceresium longicorne Pic.

Yokoi, Yaheita, 2023, Note on genitalia and taxonomy of the Callidiopini from the Philippines, with description of six new species and two subspecies (Coleoptera, Cerambycidae, Cerambycinae), Contributions to Entomology 73 (1), pp. 31-66 : 31

Ceresium longicorne Pic.

Figs 9A-E , 24A-K

Ceresium longicorne Pic, 1926: 24. Type locality: “Formosa”.

Ceresium longicorne : Matsushita, 1932: 67, 68.

Ceresium japonicum Matsushita, 1932: 67, 68.

Ceresium tsushimanum Ohbayashi, 1961: 17.

Ceresium longicorne : Hua, 2002: 200.

Examined specimens.

1♂1♀, "Sant Lucia, central Palawan, Philippines; Apr. 11, 1989, T. Niisato leg." (CTN); 1♀, ditto, with datum “Apr.10.1989” (CTN); 1♂2♀, "Trident Mines, Palawan, 3.v. 1989, A. Saito leg." (CTN); 1♀, "(PHILIPPINES), Languan, 10m, N. Palawan Is. 1.IX. 1985, By light trap, M. Tomokuni" (CNO).

Figs 9A-E and 24A-K below were based on the first male specimen indicated above.

Description of male genitalia

(Fig. 24A-K ). Median lobe about 9/20 the length of abdomen; sub-bullet-shaped in dorsal view, moderately arcuate in lateral view; dorsal plate dehiscent in basal 3/5; ventral plate longer, dehiscent in basal 3/4. Tegmen more than 4/5 as long as median lobe; moderately arcuate in profile. Parameres half the length of tegmen; apical 2/5 bi-lobed; lobes each fringed with several short apical setae. Apical process of endophallus (Fig. 24D-F ) nearly 1/5 as long as median lobe, sub-monolithic; the middle thick in lateral view, with a prominent, horn-shaped dorsal projection; sides each with an arcuate, blunt projection curved downward; base slender-spatulate. 8th sternite cotyledonary; blade extensively thinned in middle; apex in “V” -form emarginated, fringed with several long setae; peduncle a little longer than blade. 8th tergite sub-squarish with rounded corners; larger than sternite; apex weakly emarginated; fringed with several long setae.

Distribution.

Taiwan; Japan; Korea; South China; Philippines; Palawan, Philippines (New record).

Remark.

“Philippines” as a distribution is included in the catalogues by Hua (2002), without a reference. The exact locality in the Philippines is unknown. Distribution in Palawan is thus treated as a new record.

Comparative notes.

Compared to the holotype, no essential difference was observed regarding external characteristics. Ceresium longicorne shares the characteristic puncture pattern on elytra with the now sympatric Ceresium immite Newman, 1842. In both species, the punctures in the apical halves of elytra are diminutive, in clear contrast to the normal ones in the basal halves, so that the surface of each elytron is optically divided in apical and basal halves. As this type of elytral surface is observed solely in these two cases, both now sympatric species are probably affiliated, though clearly differing in pronotal surface (Figs 9E , 10B ).

More interesting for the taxonomy is the commonly shared structure of the head. The fronts of both C. longicorne and C. immite are short and steep (Figs 9D, E , 10A, B ), while the antennae are much longer than usual. These characteristics are more reminiscent of the genus Examnes than of Ceresium . No less significant is the affinity of C. longicorne to Examnes species in genitalia. The apical process of its endophallus in particular is of similar architecture as those of Examnes species (Figs 24D-F , 25D-F , 26C-E , 27D-F ). An analogy in 8th sternite and tergite is also noticeable (Figs 24J , 25J , 26F , 27K ). (See below Discussion Ceresium - Examnes ).

Figures

Figure 9. A-E. Ceresium longicorne PIC. Male from Palawan, Philippines (New record). A. Habitus, dorsal view; B. Ditto, ventral; C. Prosternum and mesoventrite; D. Head and pronotum, lateral view; E. Ditto, dorsal.

Figure 10. A, B. Ceresium immite Newman. Holotype. A. Head and pronotum, lateral view; B. Ditto, dorsal.

Figure 24. A-K. Ceresium longicorne PIC. Male from Palawan, Philippines. (New record). Genitalia. A. Median lobe with endophallus, dorsal view; B. Ditto, lateral; C. Ditto, ventral; D. Endophallus, apical process, dorsal view; E. Ditto, lateral; F. Ditto, ventral; G. Tegmen, dorsal view; H. Ditto, lateral; I. Ditto, ventral; J. 8 th sternite with 8 th tergite in the background; K. Ditto with 9 th sternite (spicum gastrale), with 7 th tergite in the background. Scale bars: 0.5 mm (D-F); 1 mm (A-C, G-K).

Figure 25. A-L. Examnes lumawigi subrugosus subsp. nov. Holotype male. Genitalia. A. Median lobe with endophallus, dorsal view; B. Ditto, lateral; C. Ditto, ventral; D. Endophallus, apical process, dorsal view; E. Ditto, lateral; F. Ditto, ventral; G. Tegmen, dorsal view; H. Ditto, lateral; I. Ditto, ventral; J. 8 th sternite, ventral view; K. Ditto, with 8 th tergite in the background; L. 8 th tergite, ventral view. Scale bars: 0.5 mm (D-F); 1 mm (A-C, G-L).

Figure 26. A-F. Examnes kawakamii Yokoi, Makihara & Noerdjito. Male from Basilan, Philippines. (New record). Genitalia. A. Median lobe with endophallus, lateral view; B. Ditto, ventral; C. Endophallus, apical process, dorsal view; D. Ditto, lateral; E. Ditto, ventral; F. 8 th sternite and tergite, ventral view. Scale bars: 0.5 mm (C-E); 1 mm (A, B, F).

Figure 27. A-L. Examnes philippensis Newman. Male from Basilan, Philippines (New record). Genitalia. A. Median lobe with endophallus, dorsal view; B. Ditto, lateral; C. Ditto, ventral; D. Endophallus, apical process, dorsal view; E. Ditto, lateral; F. Ditto, ventral; G. Tegmen, dorsal view; H. Ditto, lateral; I. Ditto, ventral; J. 8 th sternite, ventral view; K. Ditto, with 8 th tergite in the background; L. 9 th sternite (spicum gastrale) and tergite, ventral view. Scale bars: 0.5 mm (D-F); 1 mm (A-C, G-L).