Cissidium faustum, 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 : 111-112

Cissidium faustum sp. nov.

urn:lsid:zoobank.org:act:F12FEC5C-CB83-4AB9-9871-E24D1C6429BD

Fig. 70

Etymology

Named after the Latin adjective ‘ faustus ’, meaning ‘auspicious’ and referring to the likelihood of more Cissidium being recorded in the future from Mexico.

Material examined

Holotype

PANAMA • ♀; Chiriqui Prov., Castita Alta, Finca Larida nr Boquete ; 17 Mar. 1959; 7750 ft a.s.l.; forest floor litter under palms etc.; H.S. Dybas leg.; FM( HD) #59.257; FMNH.

Paratypes

PANAMA • 1 ♂; same collection data as for holotype; MMUE.

MEXICO • 1 ♀; ver. 1.2 miles S of Huatusco; 1244 m a.s.l.; cloud forest litter; 2 Aug. 1969; S. and J. Peck leg.; BMNH .

Description

SIZE. Habitus ( Fig. 70A ), length 0.67 mm.

COLOUR. Dark yellow brown, shining, pubescence, antennae and legs paler.

HEAD. With a transverse depression behind the eyes, width across eyes 0.19 mm; antennomeres III–XI length 0.32 mm, III–IX length 0.18 mm, X–XI length 0.14 mm; mentum as Fig.4A.

PRONOTUM. Length 0.20 mm, width 0.29 mm, pubescent, without both foveolae and foveae; lateral margins rounded and narrowly bordered, the borders extending a short distance along the posterior margin, hind angles rectangular, emargination opposite scutellum sinuous ( Fig.70B ).

ELYTRA. Length 0.44 mm, width 0.37 mm, pubescent, setae same length as pronotum, without foveolae.

MESOVENTRITE. Collar with strongly arched medial extension; mid-keel narrow, anterior corners almost obliterated before reaching collar, posterior corners not joining mesocoxal anterior borders, raised at junction with keel; keel with ± nine setae, long, narrow, pointed at termination below interruption of mesocoxal margins; mesoventral lateral margins without clear serrations; humeri sharply toothed ( Fig. 70C ).

METAVENTRITE. Length 0.15 mm, sparsely pubescent, disc simple in female, male with a medial depression, width across spines 0.08 mm; posterior margins of mesocoxal cavities without serrations.

WINGS. Macropterous.

GENITALIA. Female spermatheca globose with a sinuous duct.

Remarks

The only species of Cissidium to have been described from Mexico. One of the five Panamanian species in this group. Distinguished by the median extension of the mesoventral collar almost reaching to the lateral margins of the mid-keel anteriorly.

Figures

Fig. 70. Cissidium faustum sp. nov. A. Habitus. B. Pronotum, × 695. C. Mesoventrite showing median process of collar, mid-keel and keel, × 590.

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.