Ceresium lingafelteri Vives, 2013

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 lingafelteri Vives, 2013

Figs 8A-I , 23A-L

Ceresium lingafelteri Vives, 2013: 63. Type locality: "Filipinas, Is. Luzon, Cordillera Prov., Apayo".

Examined specimen.

1 ♂ "Calapan, Mindanao"; "Collection B. Schwarzer"; "Senckenberg Museum Frankfurt". (SMF).

Description of male genitalia

(Figs 8D-I , 23A-L ). Median lobe about half the length of abdomen; sub-bullet-shaped in dorsal view; moderately arcuate in lateral view; dorsal plate dehiscent in basal 9/10; ventral plate longer, dehiscent in basal 3/4, with apex sub-acute. Tegmen 4/5 as long as median lobe; strongly bi-sinuate in lateral view (Figs 8F , 23H ). Parameres 2/5 the length of tegmen; sides tapering toward apices in a sinuate line; apical 1/3 bi-lobed; lobes each fringed with short to long apical setae; additionally with a cluster of bushy setae on the external side near base; ventral sides widely emarginated. Apical process of endophallus (Figs 8E , 23D-F ) nearly 1/4 as long as median lobe; relatively slender; arcuate in lateral view. Both lateral sclerites elongated, in lateral view sharply bent at basal 1/3; apical 2/3 each projected upward in a bi-sinuate line to a sharp tooth; basal third each posteriorly extended upward to a broad, vertical wing; both wings heavily thickened on the multi-curved edges, connected to each other with a dorsal belt. Dorso-apical projection horn-shaped. Base weakly sclerotized; linguate in dorsal view, raised in middle; in profile apically thinned and bent upwards. Blade of 8th sternite transverse, cotylodenary; apex in “U” -form emarginated; base deeply emarginated on each side of the middle; basal middle heavily thickened; apex and sides fringed with hairs of long to medium length; peduncle much shorter than blade. 8th tergite elongated, linguate; fringed with sporadic setae. Peduncle of 9th sternite (spicum gastrale) about three times as long as the bifurcation. 9th tergite sub-U-shaped.

Distribution.

Luzon, Philippines; Mindanao (New record).

Comparative notes.

The setae of this specimen from Mindanao are whitish, and the pronotal sides have a few erect hairs. In other aspects, it corresponds to the original description of the holotype from Luzon.

The genitalia of this species are remarkable in several aspects. First, the dorsal plate of the median lobe is much more deeply dehiscent than usual. It is even more dehiscent than ventral plate, which is atypical. Second, tegmen is extraordinarily bi-sinuate in lateral view, while the external sides of parameres are each clothed with a cluster of bushy hairs. Third, the structure of 8th sternite is of a rare type, similar to that of C. elongatipenne sp. nov. Fourth, the peduncle of 9th sternite (speculum gastrale) is unusually long. These singularities have either not been observed before, or only rarely, in the genus Ceresium . Apical process of endophallus is characteristic of this species.

Figures

Figure 8. A-I. Ceresium lingafelteri Vives. Male from Mindanao (New record). A. Habitus, dorsal view; B. Ditto, ventral view; C. Head and pronotum; D. Median lobe with endophallus, lateral view; E. Apical process of endophallus, ventral view; F. Tegmen, lateral view; G. Parameres, ventral view; H. 8 th sternite, ventral view; I. 9 th sternite (spicum gastrale) and tergite, dorsal view.

Figure 23. A-L. Ceresium lingafelteri Vives. Male from Mindanao (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, dorsal view. Scale bars: 0.5 mm (D-F); 1 mm (A-C, G-L).