Cissidium tigrum 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 : 168-169

Cissidium tigrum Darby, 2015

Figs 2I , 4B , 5D , 6I , 106

Material examined

Holotype

BOLIVIA • ♂; cochabamba Dep., Cristal Mayu River valley ca 20 km W of Villa Tunari; 17°00′55″ S, 65°37′48″ W; 550 m a.s.l.; 24 Nov. 2013; sifting litter; Winkler app. extr.; P. Baňař leg.; UASC.

Paratype

BOLIVIA • 1 ♂; same collection data as for holotype; MMUC.

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. 106A ), length 0.63 mm.

COLOUR. Colour light brown, antennae and legs dusky yellow.

HEAD. Antennomeres III–XI 0.38 mm long, III–IX 17 mm long, X–XI 21 mm long ( Fig. 2I ); distance across eyes 0.21 mm; mentum and submentum ( Fig. 4B ).

PRONOTUM. 0.25 mm wide, 0.16 mm long, sparsely pubescent; sharply angled in anterior half then concave to rectangular hind corners and slightly convex to obtuse anterior corners, bordered, the border not continuing along the posterior margin, emargination in front of scutellum well marked ( Fig. 106B ).

ELYTRA. 0.39 mm long, 0.32 mm wide, area around scutellum more closely foveolate.

MESOVENTRITE. Medial extension of collar small, short, parallel-sided; mid-collar widest basally tapering strongly to base of keel with two small medial points not reaching mesocoxal anterior borders as carinae; keel parallel-sided with ± three setae, bluntly terminating between the mesocoxae ( Fig. 5D ); mesoventral lateral margins effaced; humeri large, toothed with a long, strongly sloping posterior margin ( Fig. 106C ).

METAVENTRITE. Length 0.13 mm, disc simple, width across spines 0.10 mm, spines short.

Remarks

Distinguished from all other species of Cissidium in this paper by the shape of the male antennomere XI ( Fig. 2I ).

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. 5. Figures to show keel shapes. A. Cissidium bifoveolatum sp. nov., × 515. B. Cissidium lucidulum sp. nov., × 780. C. Cissidium scutellaris (Deane, 1931), × 1480. D. Cissidium tigrum Darby, 2015, × 840. E. Cissidium sawadai Darby, 2015, × 680. F. Cissidium lisae Darby, 2015, × 823.

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. 106. Cissidium tigrum Darby, 2015. A. Habitus. B. Pronotum. C. Mesoventrite showing median process of collar, effaced lateral margin, mid-keel and keel, × 855.