Cissidium petri Darby, 2015

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 123-124

Cissidium petri Darby, 2015

Figs 2H , 4A , 6F , 7F , 78

Material examined

Holotype

BOLIVIA • ♂; Cochabamba dep., Cristal Mayu River valley , ca 20 km W of Villa Tunari; ca 720 m a.s.l.; 24 Jun. 2013; sifting litter; Winkler app. extr.; P. Baňař leg.; UASC.

Paratypes

BOLIVIA • 1 ♂, 1 ♀; same collection data as for holotype; MMBC, BMNH.

Supplementary description

The following description amplifies the type description of Darby (2015), by adding more details of the meso- and metaventral characters, in order to conform with the entries in the present paper.

SIZE. Habitus ( Fig. 78A ), length 0.68 mm.

COLOUR. Light brown, antennae and legs dusky yellow. HEAD. Antennomeres, 3–11 length 0.33 mm, III–IX length 0.19 mm, X–XI length 0.14 mm ( Fig. 2 Hab); distance across eyes 0.19 mm; mentum as Fig. 4A.

PRONOTUM. 0.26 mm wide, 0.19 mm long, sparsely pubescent, sides rounded, concave to rectangular hind angles, anterior angles obtuse, bordered, the border continuing along the posterior margin to the medial emargination in front of the scutellum ( Fig. 78B ).

ELYTRA. 0.40 mm long, 0.35 mm wide; pubescent, foveolate contrasting with the pronotum.

MESOVENTRITE. Median extension parallel-sided; mid-keel sides concave, anterior angles slightly wider than posterior angles which are effaced before mesocoxal anterior borders, slightly raised before meeting keel; keel with ± ten setae, strongly tapering to point close to base of mesocoxae; mesoventral lateral margins effaced ( Fig. 78C ).

METAVENTRITE. Pubescent, disc simple, length 0.16 mm, distance between spines 0.09 mm; posterior margin of metacoxae without serrations.

GENITALIA. Male aedeagus ( Fig. 6 Fa–b), terminal abdominal ventrites ( Fig. 7F ). Female spermatheca globular.

Figures

Fig. 2. A–B. Mesoventra of two species of Dacrysoma Grebennikov, 2009 to show form of mid-keel and perforation fringed by setae. C–E. Figures to explain use of the terms foveae, distinct foveolae and shallow foveolae in distinguishing the main species groups. C. Distinct foveolae, showing setae arising from the anterior margin of the depressions. D. Foveae and foveolae, showing setae randomly associated with foveae. E. Shallow foveolae, many setae rubbed off, but insertion points marked by punctures with slightly raised circular rims. F–I. Figures to show different forms of antennae. F. Elongate antenna of Cissidium lisae Darby, 2015. G. Globular antennomere of Cissidium globosum Darby, 2015. H. Female and male antennae of Cissidium petri Darby, 2015. I. Abnormal antennomere XI of Cissidium tigrum Darby, 2015.

Fig. 4. Menta and submenta. A. Cissidium petri Darby, 2015, × 1380. B. Cissidium tigrum Darby, 2015, × 1220. C. Cissidium amboroense Darby, 2015, × 1260. D. Cissidium losbanos sp. nov., × 1100. E. Cissidium triangulum Darby, 2019, × 650. F. Cissidium pilosellum sp. nov., × 1420.

Fig. 6. Figures to show genitalia types. – Spermathecae. A. Cissidium bilineatum sp. nov. B. Cissidium amboroense Darby, 2015. C. Cissidium sawadai Darby, 2015. D. Cissidium arcuatum sp. nov. E. Cissidium murphyi sp. nov. – Aedeagi. F. Cissidium petri Darby, 2015. G. Cissidium clareae sp. nov. H. Cissidium fraternum sp. nov. I. Cissidium tigrum Darby, 2015. J. Cissidium apterum sp. nov. K. Cissidium brachypterum sp. nov. L. Cissidium greensladei sp. nov. M. Cissidium kolombangaricum sp. nov. N. Cissidium mindanao sp. nov.

Fig. 7. Metaventral and male ventrite examples. A–B. Metaventrite posterior margin to show spines. A. Cissidium riparium sp. nov., × 610. B. Cissidium plaumanni sp. nov., × 970. C–D. Metaventral discs. C. Cissidium greensladei sp. nov., × 455. D. Cissidium insulare sp. nov., × 595. E. Cissidium obscenum sp. nov., × 840. F–G. Terminal male ventrites. F. Cissidium petri Darby, 2015, × 1580. G. Cissidium amboroense Darby, 2015, × 1380.

Fig. 78. Cissidium petri Darby, 2015. A. Habitus. B. Pronotum. C. Mesoventrite showing median process of collar, mid-keel and keel, × 705.