Cissidium trangse, 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 : 132-134

Cissidium trangse sp. nov.

urn:lsid:zoobank.org:act:E9F8435B-868D-4989-A272-ADA87C244DB4

Fig. 84

Etymology

Johnson ms name after Trang in the SW of Thailand where the insect was collected.

Material examined

Holotype

THAILAND • ♀; S., Kachong Exp. Stat b. Trang; Franz leg.; one antenna lost in SEM; MMUE.

Additional material

A teneral specimen in MMUE taken at the same time may be this species.

Description

SIZE. Habitus ( Fig. 84A ), length 0.58 mm.

COLOUR. Yellow brown, pubescence, legs and antennae dusky yellow.

HEAD. With a shallow foveolate and setose linear depression behind the eyes; width across eyes 0.18 mm; mentum as Fig. 4A ; antennomeres III–XI, length 0.30 mm, III–IX length 0.14 mm, X–XI length 0.16 mm.

PRONOTUM. 0.18 mm long, 0.24 mm wide, pubescent with shallow foveolae in basal half where there are traces of two short linear foveae; lateral margins evenly rounded before shallow concave sinuations to bluntly rectangular hind angles, narrowly bordered, the borders continuing along the posterior margin becoming wider towards the angulate medial emargination in front of the scutellum ( Fig. 84B ).

ELYTRA. 0.38 mm long, 0.33 mm wide, pubescent, without foveolae.

MESOVENTRITE. Medial extension of collar slightly tapering; mid-keel anterior angles widening before collar, posterior angles rounded; keel narrow, densely setose, tapering then parallel-sided to termination just past the interruption point of the mesocoxal margins; mesoventral lateral margins serrate in posterior half; humeri toothed ( Fig. 84C ).

METAVENTRITE. Sparsely pubescent, length 0.10 mm, disc simple, width across spines 0.08 mm; posterior margin of mesocoxae serrate.

WINGS. Macropterous.

GENITALIA. Female spermatheca globular. Males not known.

Remarks

The only species of Cissidium to have been described from Thailand.

Figures

Fig. 84. Cissidium trangse sp. nov. A. Habitus. B. Pronotum, × 480. C. Mesoventrite showing median process of collar, mid-keel and keel, × 670.

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.