Cissidium delicatum, Darby, 2020

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 37-38

Cissidium delicatum sp. nov.

urn:lsid:zoobank.org:act:AC999121-61B9-4EF3-B3B3-1F692F285D33

Figs 3C , 23

Etymology

Johnson ms name, presumably after the delicate nature of this species.

Material examined

Holotype

AUSTRALIA • ♀; Queensland, Maiala Nat. Park, Mt Glorious, Brisbane ; 4 Aug. 1966; mixed leaf litter; R.A. Crowson leg.; MMUE.

Description

SIZE. Habitus ( Fig. 23A ), length 0.60 mm.

COLOUR. Yellow.

HEAD. With a shallow linear depression behind the eyes ( Fig. 3C ); eyes very much reduced, only ± four ommatidia present, presumed blind, width across these 0.15 mm; antennomeres III–XI length 0.27 mm, III–IX length 0.16 mm, X–XI length 0.11 mm globular; mentum as Fig. 4A.

PRONOTUM. Length 0.17 mm, width 0.23 mm, sparsely pubescent, with a pair of foveae at the base; lateral margins evenly rounded almost to rectangular hind angles, narrowly bordered, border extending a short way onto the posterior margin; posterior border without an emargination in front of the scutellum ( Fig. 23B ).

ELYTRA. Length 0.38 mm, width 0.29 mm, pubescent, setae same length as pronotum, foveae slightly larger in basal third.

MESOVENTRITE. Medial extension of collar short; mid-keel lateral margins sinuate, posterior corners not joining mesocoxae, sharply raised medially before keel; keel with ± four setae, tapering to point at base of the mesocoxae; mesoventral lateral margins obscured; humeri with small tooth ( Fig. 23C ).

METAVENTRITE. Length 0.11 mm, sparsely pubescent, disc simple, width across spines 0.09 mm; posterior margins of mesocoxal cavities not serrate.

WINGS. Apterous.

Remarks

The rounded pronotal sides almost to the hind angles distinguishes this species from the other Australian Cissidium .

Figures

Fig. 3. Figures to show differences in morphological features of head between eyes. A. Cissidium upiense sp. nov., × 565. B. Cissidium sueae sp. nov., × 480. C. Cissidium delicatum sp. nov., × 1060. D. Cissidium foveolatum Johnson, 1982, × 730. E. Cissidium basale Motschulsky, 1855, × 385. F. Cissidium ibicarense sp. nov., × 505. G. Cissidium eciton sp. nov., × 650.

Fig. 23. Cissidium delicatum sp. nov. A. Habitus. B. Pronotum, × 695. C. Mesoventrite showing median process of collar, mid-keel and keel, × 1600.

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.