Cyclorhipidion titorum Smith, Beaver, Pham & Cognato, 2022

Smith, Sarah M., Beaver, Roger A., Pham, Thai Hong & Cognato, Anthony I., 2022, New species and new records of Xyleborini from the Oriental region, Japan and Papua New Guinea (Coleoptera: Curculionidae: Scolytinae), Zootaxa 5209 (1), pp. 1-33 : 14-15

Cyclorhipidion titorum Smith, Beaver, Pham & Cognato sp. nov.

( Figs 45–48 )

http://zoobank.org/ urn:lsid:zoobank.org:act:25B61327-5FE5-45A7-90B8-AF88DA3E7F37

Type material. Holotype, female: VIETNAM, Lao Cai Prov., Hoang Lien N.P., 22.35N, 103.77E, 1500–2000m, 19.v.2019, VN170, SM Smith, AI Cognato, ex 5 cm branch, MSUC_ARC_314130 ( MSUC) . Paratypes, as holotype MSUC_ARC_314141, MSUC_ARC_314142, (2, MSUC), NHMUK014591848 (1, NHMUK) ; as holotype except: 17.v.2019, VN 159, ex 3–5 cm branch, MSUC_ARC_314143 (1, MSUC; 1, NMNH) ; VIETNAM: Lao Cai Prov., 17.v.2019, VN156, ex 4 cm branch, SAX 394 [DNA voucher], MSUC_ARC_314144 (1, MSUC) .

GenBank. CAD: OP607180 and COI: OP617751 .

Diagnosis. This species is distinguished by the moderate size and comparatively stout form; declivity obliquely truncate with rounded margins; pronotum about as long as wide and subquadrate from dorsal view, type 3; declivital interstrial punctures replaced by sparse, small, confused tubercles; declivital strial punctures moderate, distinct; declivital face appearing convex and strongly shiny; and declivital striae feebly impressed and interstriae inflated on apical 1/2.

This species most closely resembles C. amputatum Smith, Beaver & Cognato, 2020a from which it can be distinguished by the following combination of characters ( C. titorum given first): smaller size and stouter form 4.2– 4.6 mm long, 2.47–2.71 × as long as wide vs 5.0 mm long, 3.13 × as long as wide; declivital striae feebly impressed vs distinctly impressed; declivity densely setose, interstriae 1 and 2 with three confused rows of long dense setae vs declivity lightly setose, interstriae 1 and 2 with two confused rows of short setae.

Similar species. Cyclorhipidion amputatum , C. muticum Smith, Beaver & Cognato, 2020 , C. circumcisum

Description (female). 4.2–4.6 mm long (mean = 4.44 mm; n = 5); 2.47–2.71 × as long as wide. Body dark brown, antennae and legs light brown. Head: epistoma entire, transverse, with a row of hair-like setae. Frons weakly convex to upper level of eyes; surface shiny, punctate, alutaceous, rugose. Eyes shallowly emarginate just above antennal insertion, upper part smaller than lower part. Submentum broadly triangular, deeply impressed. Antennal scape regularly thick, as long as club. Pedicel as wide as scape, shorter than funicle. Funicle 4-segmented, segment 1 shorter than pedicel. Club approximately circular and flat, type 3; segment 1 corneous, transverse on anterior face, occupying basal ~1/3; segment 2 narrow, corneous; segments 1 and 2 present on posterior face. Pronotum 0.94–1.0 × as long as wide. In dorsal view subquadrate and, sides convex, type 3, narrowly rounded anteriorly; anterior margin without serrations. In lateral view tall, type 2, disc flat, summit at anterior ~2/5. Anterior slope shagreened, with densely spaced, fine, narrow asperities, becoming lower and more strongly transverse towards summit, bearing long, fine, semi-recumbent, hair-like setae. Disc subshiny, alutaceous, densely, finely punctate, finely setose, setae short, erect, hair-like. Lateral margins obliquely costate. Base transverse, posterior angles broadly rounded. Scutellum large, broad, linguiform, shiny, flush with elytra, flat. Elytra: 1.12–1.71 × as long as wide, 1.12–1.81 × as long as pronotum. Base transverse, edge oblique, humeral angles rounded, parallel-sided in basal 9/10, then sharply angulate to apex. Disc flat, shiny, striae and interstriae densely setose, setae long, semi-recumbent, hair-like, striae and interstriae strongly confused, indistinguishable; striae and interstriae not impressed, minutely punctate, punctures strongly confused, separated by 2‒5 diameters of a puncture. Declivity occupying ~1/3 of elytra, obliquely truncate, face convex, strongly shiny; five striae present, striae feebly impressed, striae 2 equidistant between 1 and 3, strial punctures moderate, distinct, subcontiguous to separated by one diameter of a puncture, subshiny, much larger than on disc; interstriae inflated on apical 1/2 of declivity, interstriae setose, setae dense, long, semi-erect hair-like, interstriae 1 and 2 with three confused rows; interstriae impunctate, coarsely tuberculate, tubercles sparse, small, strongly confused, variably sized. Posterolateral margin forming a costa extending laterally to interstriae 7; costa tuberculate, setose, setae long, erect, fine, hair-like. Legs: procoxae contiguous; prosternal coxal piece tall and pointed. Protibiae semi-circular with evenly rounded outer margin, broadest at apical 1/3; posterior face smooth; apical 1/3 of outer margin with ten or 11 moderate socketed denticles, their length approximately as long as basal width. Meso- and metatibiae broad, flattened; outer margin evenly rounded with 15 or 16 moderate socketed denticles.

Distribution. Vietnam.

Host plants. Unknown.

Etymology. L. patronym for the Titus family. Given that xyleborines farm fungi as a family, it is appropriate to honor the Titus family farmers. Rebecca, Paul, and Rose have provided SMS and AIC (and hundreds of others in Central Michigan) with sustainable foods (including mushrooms) for over 15 years.

Figures

FIGURES 37‒48. Lateral, dorsal, posterior oblique and anterior view of Cyclorhipidion nepalense holotype, 2.7 mm (37–40), Cyclorhipidion taedulum holotype, (41–44), Cyclorhipidion titorum holotype, 2.71 mm (45–48).