Cissidium advena Darby 2020, sp. nov.

Cissidium advena sp. nov.

urn:lsid:zoobank.org:act: 3DB446BE-D563-4B2E-82DE-26F856A8AFD2

Fig. 13

Johnson ms name. Presumed to be from the Latin ‘ advena ’, meaning ‘a stranger’. Noun in apposition.

Holotype

PHILIPPINES • ♂; Mindanao, Todaya, E slope of Mt Apo, Davida Prov.; 16 Jun. 1946; 2800 ft a.s.l.; in decaying leaf fragments under young bamboo petioles; F. Werner leg.; FM(HD) # 46.43; mounted as a disarticulated slide; FMNH.

SIZE. Habitus (Fig. 13A), length 0.76 mm.

COLOUR. Yellow brown, pubescence, legs and antennae yellow. HEAD. With a clearly marked linear depression and short median longitudinal depression between the eyes, width across eyes 0.23 mm; antennomeres III–XI length 0.34 mm, III–IX length 0.19 mm, X–XI length 0.15 mm; mentum as Fig. 4A.

PRONOTUM. Length 0.21 mm, width 0.28 mm, sparsely pubescent mostly confined to anterior corners, with row of eight basal foveae, the median four tending to form two large ones; side margins rounded, slightly concave before rectangular hind angles, border not extending onto posterior margin, emargination before scutellum sinuate (Fig. 13B).

ELYTRA. Length 0.42 mm, width 0.42 mm, sparsely pubescent without foveolae.

MESOVENTRITE. Medial extension of collar short, broad; mid-keel tapering from anterior corners to posterior margin with carinae at the corners reaching to the mesocoxal anterior borders, medially with a sharply defined longitudinal ridge rising to a blunt point before the keel; keel parallel-sided to rounded termination past mid-point of the mesocoxae; mesoventral lateral margins serrate posteriorly (Fig.13C).

METAVENTRITE. Length 0.12 mm, width across spines 0.08 mm, with scattered setae near margins, disc depressed; mesoventral posterior margins serrate.

WINGS. Macropterous.

GENITALIA. Male aedeagus as Fig. 6 Fa–b. Female not known.

One of the only two species of Cissidium in this group from the Philippines. Distinguished by the larger pronotal foveae than those on C. davaoense sp. nov.