Contacyphon tristis (Gemminger, 1869)

Ruta, Rafał, 2020, An overview of Scirtidae (Coleoptera) described by Antoine Joseph Jean Solier (1792 - 1851), Zootaxa 4767 (4), pp. 563-577 : 571-572

Contacyphon tristis (Gemminger, 1869)

( Figs 2E , 3E , 9 )

Cyphon obscurum Solier, 1849: 458 (terra typica: Illapel, Santa Rosa)

Helodes tristis Gemminger, 1869: 125 (new substitute name)

Helodes tristis Gemminger : Gemminger & von Harold 1869: 1620

Cyphon tristis: Pic 1914: 36 (checklist; Chile)

Cyphon triste: Blackwelder 1944: 267 (checklist; Chile); Moroni 1985: 174 ( Chile, prov. de Coquimbo, Illapel; prov. de Aconcagua, Los Andes)

Contacyphon tristis: Zwick et al. 2013: 347

Type material of Contacyphon obscurum . Lectotype (present designation), “ Cyphon \ obscurum Sol \ Chili ” [handwritten with brown ink, probably by Solier]; “9 \ 45” [handwritten on a green, round label]. The specimen is covered with mould, but otherwise well preserved.

Description. Male, body oval, TL = 3.8 mm. Head brown, pronotum orange, scutellar shield and adscutel- lar portions of elytra orange, posterior and lateral portions of elytra brownish, antennae and mouthparts orange, legs brown. Punctures on elytra separated by ca. 0.7–1.0 diameter of a puncture. Anterolateral angles of pronotum slightly projecting anteriorly, posterolateral angles obtuse. Penis (L 0.77 mm, W 0.43 mm) symmetrical, with wide basal portion, short and wide trigonium, and two parameroids, each parameroid with paired hooks in basal 1/3, apical 2/3 very narrow, rod-like; tegmen (L 0.58 mm, W 0.55 mm) with very narrow parameres, each paramere with lateral spine which is almost half as long as paramere, apical portions of parameres slightly widened, apices pointed; tergite VIII (L 0.55 mm, W 0.49 mm) with subrectangular apical plate, densely covered with setae, apical margin with numerous dense, short setae forming a comb-like structure and much sparser longer setae, apodemes as long as apical plate; tergite IX (L 0.49 mm, W 0.40 mm) narrower than tergite VIII, apical portion membranous, setation absent, apodemes slightly diverging basally; sternite VIII absent; sternite IX (L 0.29 mm, W 0.30 mm) consisting of two elongate oval hemisternites, with short and sparse setae at apices.

Remarks. Two localities are listed in the original description ( Solier 1849), therefore Solier examined more than a single specimen of this species. A lectotype is designated in order to preserve the stability of nomenclature by selecting one specimen as the sole, name-bearing type of the taxon.

Figures

FIGURE 2. Historical labels of Scirtidae specimens from the collection of A. Solier (A–I), and specimens collected by C. Gay (J–K). A) Contacyphon luteolineatus; B) Contacyphon maculicornis; C) Contacyphon parvus; D) Contacyphon testaceus; E) Contacyphon tristis; F) Elodes rousseli; G) Pseudomicrocara lunata; H) Pseudomicrocara obliquata; I) Pseudomicrocara tor- quata; J) an unidentified specimen; K) Contacyphon maculatus.

FIGURE 3. Lectotypes of species described by A. Solier, general view. A) Contacyphon luteolineatus (Solier, 1849); B) Con- tacyphon maculicornis (Solier, 1849); C) Contacyphon parvus (Solier, 1849); D) Contacyphon testaceus (Solier, 1849); E) Contacyphon tristis (Gemminger, 1869); F) Elodes rousseli Solier, 1849; G) Pseudomicrocara lunata (Solier, 1849); H) Pseudomicrocara obliquata (Solier, 1849); I) Pseudomicrocara torquata (Gemminger, 1869). Scale bars = 1.0 mm.

FIGURE 9. Contacyphon tristis (Gemminger, 1869), lectotype, male genitalia. A) penis; B) tegmen; C) tergite VIII; D) tergite IX; E) sternite IX. Scale bar = 0.25 mm.