Cissidium crowsoni Johnson, 1982

Darby, Michael, 2020, A revision of Cissidium Motschulsky (Coleoptera: Ptiliidae) with seventy seven new species, European Journal of Taxonomy 622, pp. 1-188 : 32-33

Cissidium crowsoni Johnson, 1982

Fig. 20

Material examined

NEW ZEALAND • 1 ex.; Northland, Waipoua forest station ; 120 m a.s.l.; 10–11 Dec. 1983; Kauri forest litter; P.M. Hammond leg.; BMNH • 1 ex.; Auckland, Waitakere Range, Cascades Kauri Park ; 8 Jan. 1984; wet litter by stream; P.M. Hammond leg.; BMNH • 1 ex.; Waikato: Hakarimata ; ca 100– 300 m a.s.l.; 20 Nov. 1983; native forest litter; P.M. Hammond leg.; BMNH • 3 ex.; Hapuakohe Range, Maungakawa ; 500 m a.s.l.; 3 Jan. 1984; Nikau leaf bases on ground; P.M. Hammond leg.; BMNH .

Supplementary description

The description below concentrates in particular on amplifying Johnson’s description with more details of the meso- and metaventral characters in order to conform with the present paper.

SIZE. Habitus ( Fig. 20 A ), length 0.78 mm.

COLOUR. Dusky yellow.

HEAD. With a shallow linear depression and short medial longitudinal depression between the eyes, width across eyes 0.21 mm; antennomeres III–XI length 0.39 mm, III–IX 0.23 mm, X–XI length 0.16 mm globular; mentum and prementum as Fig.4 A.

PRONOTUM. Length 0.20mm, width 0.30 mm, widest along the posterior margin, pubescent, with a row of eight foveae along the base, the outer two on each side smaller than the inner four; lateral margins evenly rounded anteriorly and slightly concave posteriorly before the acute hind angles, bordered, the border

continuing for a short distance along the posterior margin which has a sinuous emargination before the scutellum ( Fig. 20 B ).

ELYTRA. Length 0.53 mm, width 0.43 mm, pubescent, foveolate.

MESOVENTRITE. Medial extension of collar widening posteriorly; mid-keel short with concave sides, posterior corners with narrow carinae to mesocoxal anterior margins, raised sharply to keel base; keel with ± two setae, narrow, tapering to termination between the mesocoxae; mesoventral lateral margins serrate in posterior half; humeri strongly toothed ( Fig. 20 C ).

METAVENTRITE. Length 0.19 mm, width across spines 0.14 mm; posterior margins of mesocoxal cavities not serrate.

WINGS. Micropterous.

GENITALIA. Male aedeagus as Fig. 6 Fa–b. Female spermatheca globular.

Remarks

Described by Johnson on the basis of a single female from New Zealand, North Island, Northland, Parahaki, Whangerei, mixed leaf litter, 8. xi.1956, leg. R.A. Crowson (NZAC). Distinguished from C. foveolatum Johnson, 1982 , the only other Cissidium reported from New Zealand, by the smaller foveae on the basal margin of the pronotum.

Figures

Fig. 20. Cissidium crowsoni Johnson, 1982. A. Habitus. B. Pronotum, × 550. C. Mesoventrite showing median process of collar, mid-keel and keel, × 595.

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.