Cordielytrum inca, Whorrall & Philips, 2021

Whorrall, Kyle & Philips, Keith, 2021, Six new species of spider beetles (Coleoptera: Ptinidae) in the genus Cordielytrum Philips, Zootaxa 5040 (3), pp. 414-427 : 418

Cordielytrum inca , sp. n.

( Fig. 4 )

Holotype: Peru: Arequipa Region, nr. la Caleta del Inca, dune veg. litter 21.VI.2019, 2570 m S16.4880° W72.9465° K.A.Whorrall & T. K. Philips . Holotype has been deposited in MUSM . Paratypes (131): Same data as holotype (7);

Peru: Arequipa Region, Ocoña Lomas , 18–22. VI .2019 S16.4214° W73.0490° 725 m scattered veg, dung pitfalls K.A. Whorrall & T . K. Philips (122). Paratypes have been deposited in MUSM, USNM, NHMUK, TAMU, KAWC, TKPC , and JBHC.

Diagnosis: This species is distinguished from its congeners by the pronounced carinae on its elytra with 4–5 rows of deep, open depressions between each. It can be distinguished from C. fimbriatum ( Fig. 5 ) and C. obscurum ( Fig. 6 ) by its simple erect elytral setae and from C. adustum ( Fig. 7 ) by its larger size, the more discrete light and dark patches of coloration on its elytra, and its more strongly transverse pronotum.

Description. Body small, compact, subovate, convex; mottled tan and brown with a slight sheen. Length (anterior of pronotum to apex of elytra) 2.23–3.13 mm.

Head completely covered with light tan, depressed, ovoid scales; pronounced superantennal carinae, with a small number of recumbent, apically expanded, ligulate setae; antennae stout, antennomeres 1–10 densely squamous, apical antennomere with simple setae, antennomeres 1–4 and 11 slightly longer than wide, others subequal; clypeus distinct; labrum with short erect orange setae apically; frons with moderately long ligulate scales pointing toward middle.

Pronotum covered with densely matted setae, short, erect setae protruding from deep cavities within matted setation, dorsally truncate, bifurcate; two shallow anterolateral depressions; medial cavity shallow, broad, extending about ½ total length and about 1/3 width of pronotum, borders rounded; two posterolateral cavities on each side shallow.

Elytra: Setation silvery tan-gray with large distinct black patches, background color dark brown; surface densely covered in small scoop-shaped scales; basal ¼ of anterolateral margin with row of very long bristly setae; five highly prominent longitudinal carinae extending length of each elytron, including one at suture, each carina with one row of very short truncate setae; ~4 rows of deep, open depressions between carinae.

Ventral Surface: Ventral part of pro-, meso, and, metathorax, legs, and abdominal ventrites with scales similar to elytra.

Etymology: The name “inca” is from the beach la Caleta del Inca near the collection site of the holotype.

Figures

FIGURE 4. Cordielytrum inca. A Dorsal habitus, B ventral sclerites, C lateral view, D frontal close-up. Scale bars: 1.0 mm (A, C), 0.5 mm (B, D).

FIGURE 5. Cordielytrum fimbriatum. A Dorsal habitus, B ventral sclerites, C lateral view, D frontal close-up. Scale bars: 1.0 mm (A, C), 0.5 mm (B, D).

FIGURE 6. Cordielytrum obscurum. A Dorsal habitus, B ventral sclerites, C lateral view, D frontal close-up. Scale bars: 1.0 mm (A, C), 0.5 mm (B, D).

FIGURE 7. Cordielytrum adustum. A Dorsal habitus, B ventral sclerites, C lateral view, D frontal close-up. Scale bars: 0.5 mm (A, C), 0.25 mm (B, D).