Chnoodes yanayacu sp. nov.

urn:lsid:zoobank.org:act: 8FCC7088-DF9A-4416-A348-F99E37EAAE09

Figs 5G–I, 7

Diagnosis

This species is most similar to Chnoodes rufovittata Mader, 1957; however; its body outline is more elongate and maculae are larger, covering more surface of elytra, whereas in C. rufovittata the body is more rounded with smaller elytral maculae. Chnoodes yanayacu sp. nov. is also quite similar to C. centralis Sicard, 1912 and C. unimaculata Krüger, Castro-Guedes & Almeida, 2016 (Krüger et al. 2016; Krüger 2018), by general appearance, but it differs from both species by much larger elytral maculae covering almost the entire surface of the elytra, while in both mentioned species the macula are distinctly smaller or forming a ring pattern. This species also differs from C. centralis by having the female genitalia with longer styli and constricted base of the spermatheca, from C. unimaculata by more elongate coxites and the presence of a mammiliform projection on spermathecal apex. Males of C. centralis and C. unimaculata are unknown. C. rufovittata was described from Bolivia while C. centralis from French Guiana, and C. unimaculata occur in Eastern Brazil (Pará).

Etymology

This species is named after the Yanayacu biological station in Ecuador where the type series was collected.

Material examined

Holotype

ECUADOR • ♂; “ Napo prov., Cosanga, Yanayacu, collecting along the road, 25 XI 2009, leg. R. Ruta”; MNHW.

Paratypes

ECUADOR • 1 ♀, 1 ex.; same collection data as for holotype; MNHW • 2 ex.; “ Cosanga vic., Las Palmas Island, 2 XII 2009, leg. R. Ruta ”; MNHW • 1 ex.; “ Cosanga, Yanayacu, road, 2 XII 2009, leg. R. Ruta ”; MIZ.

Remarks

Guillermo González illustrated the holotype of C. rufovittata on his website (www.coccinellidae.cl), which is deposited in the Museo Nacional de Historia Natural de Santiago, Chile (MNHNS), but he was not able to investigate genitalia of that specimen. We provide here a detailed description of male and female genitalia that will allow to verify the status of C. yanayacu sp. nov. when new information is available.

Description

BODY. Length 3.20 mm; TL/EW = 1.15–1.30; PL/PW = 0.52; EL/EW = 0.95–1.00. Body oval (Fig. 5G), moderately convex (Fig. 5H), winged; dorsum black with one big, chestnut brown spot on each elytron and light brown anterolateral edges of pronotum (Fig 5I); ventral side infuscate. Dorsum covered with short hairs, forming weak, wavy pattern on elytra. Dorsum with single size punctures. Punctures on elytra less coarse than on head and pronotum.

HEAD. Head partially covered by pronotum (Fig. 5I); ventral antennal grooves deep, straight. Eyes moderately convex, dorsally with inner orbits arcuate; ocular canthus present, protruding, reaching beyond half width of an eye; interocular distance about 0.50 × as wide as head across eyes; interfacetal setae absent. Antenna short, about 0.50 × as long as head capsule width, composed of 10 antennomeres; scape enlarged, distinctly roundly projected anteriorly; pedicel narrower than scape, barrel-shaped, about 1.20 × as long as wide; antennomere 3 distinctly shorter than pedicel. Antennal club consisting of four antennomeres; antennomeres 7–9 transverse, antennomere 10 elongate, truncate apically. Anterior clypeal margin margined with anterolateral lobes roundly projected. Labrum truncate at apex. Mandible bidentate at apex. Maxillary cardo slightly transverse; terminal palpomere securiform, truncate obliquely. Submentum transverse; mentum sub-trapezoidal, covered with sparse long hairs, with lateral longitudinal weak impressions on each side; prementum transverse; labial palps separated by distance about equal to width of palpiger; apical palpomere slightly shorter than penultimate one.

PROTHORAX. Pronotum (Fig. 5I) with anterior corners rounded, slightly produced anteriorly, not swollen with regular border; anterior and lateral margin with entire border; posterior margin without border. Prothoracic hypomeron smooth; prosternal process with sides parallel, with apex rounded, its surface with lateral carinae short, joined with procoxal bordering line. Prosternum in front of coxa about 0.60 × as long as coxal longitudinal diameter at the same position, anterior margin with complete bordering line; procoxal cavity transverse oval; procoxal bordering line incomplete medially.

PTEROTHORAX. Mesoventrite with anterior edge straight with complete raised border; mesoventral process at median width of coxa about equal as corresponding coxal diameter; meso-metaventral articulation with suture visible; junction straight. Scutellar shield triangular, bordered; surface punctate and haired. Elytra with sides rounded; lateral margins slender, entirely visible from above; humeral angles present; elytral epipleuron wide, about 3.0 × as wide as corresponding metaepisternum, incomplete apically, with shallow foveae for reception of femora; inner margin with border line fading before base of elytron. Metaventrite with discrimen long but incomplete anteriorly; metaventral postcoxal lines joined at middle, laterally complete, rounded; metaventrite finely punctate.

LEGS. Legs with trochanters angulate; femora relatively large, excavated to receive tibiae, tibiae shallowly excavated to receive the tarsi, tibial apices without spurs; tarsi with four tarsomeres, third very small; tarsal claws of all legs in both sexes bifid.

ABDOMEN. Abdomen with 5 ventrites in both sexes (Fig. 7A–B); ventrite 1, 1.20 × as long as ventrite 2, ventrite 2, 1.20 × as long as ventrites 3 and 4; abdominal postcoxal lines separate medially, incomplete, posteriorly reaching hind margin of ventrite 1; additional oblique line on ventrite 1 present; hind margin of ventrite 5 in both sexes rounded; in male tergite VIII (Fig. 7E) and sternite VIII (Fig. 7F) truncate apically; sternite VIII with shallow, but clearly visible central depression; in female tergite VIII (Fig. 7C) and sternite VIII (Fig. 7D) rounded apically. Sternites VIII and ventrites VIII in both sexes with long hairs on hind margin.

MALE TERMINALIA AND GENITALIA. Sternite IX (Fig. 7L) with bilobed, partially membranous additional sclerite at base of apodeme; apodeme rod-like, straight; tergite X very short, transverse. Tegmen in inner view (Fig. 7N) with penis guide parallel, apex acute; parameres (Fig. 7M), well developed, simple, more than 2 × as long as penis guide, with fringe of dense, long setae on apices and edges; tegminal strut wide. Penis capsule (Fig. 3I) with inner arm narrow, outer arm broadened but short; penis of equal diameter along entire length, widened on tip (Fig. 7K), tip not partially membranous (Fig. 7J).

FEMALE GENITALIA. Sperm duct uniform in diameter, shorter than spermatheca; infundibulum absent; spermatheca vermiform, without clear nodulus and ramus, but with mammiliform projection on apex (Fig. 7G); spermathecal accessory gland adjacent to sperm duct. Coxites elongate, rounded on apices, inner surface covered with long hairs; styli distinct (Fig. 7H).