Sindosium collinsi, Darby, Michael, 2019

Darby, Michael, 2019, New Ptiliidae (Coleoptera) from Sarawak in the spirit collection of the Natural History Museum, London, European Journal of Taxonomy 512, pp. 1-50 : 4-5

Sindosium collinsi sp. nov.

urn:lsid:zoobank.org:act:E8C7E79C-4136-4C77-97DD-07373C1335D5

Fig. 2

Diagnosis

Shares with S. foveatum the pair of sulci under the mesoventral collar but distinguished from that species by the foveolate pronotum without a clearly defined medial fovea and by the shorter pubescence. From S. opacipenne it may be distinguished by the foveolate mesoventrum and from S. bacchusi by the form of the hind angles of the pronotum lacking semi-circular incursions.

Etymology

Named after Nicholas M. Collins, the collector of the paratypes and of other Sarawak specimens.

Type material

Holotype MALAYSIA-BORNEO • ♀; Sarawak, 4 th Division, Gunung Mulu National Park ; May–Aug. 1978; P.M. Hammond and J.E. Marshall leg., BM 1978 -49 ; limestone forest litter; BMNH.

Paratypes

MALAYSIA-BORNEO • 1 spec.; same data as for holotype; BMNH • 3 specs (one example fragments only mounted as a slide); Sarawak; 200 m a.s.l.; 1978; N.M. Collins leg.; limestone forest, pitfalls; BMNH .

Description

SIZE. Habitus ( Fig. 2A ), length 0.94 mm.

COLOUR. Elytra dark brown, pronotum and head yellowish brown, antennae and legs yellow. Pronotum and elytra with pale pubescence the setae arising from small foveolae ( Fig. 2D ).

HEAD. With scattered longer pubescence. Distance across eyes 0.27 mm. Eyes prominent.Antennomeres III–XI, length 0.31 mm. Mentum setae forming only two rows; submentum with a pair of long setae ( Fig. 2C ).

PRONOTUM. Length 0.24 mm width 0.41 mm, with wide lateral borders and raised serrate margins, posterior border with raised margin ( Fig. 2D ).

ELYTRA. Length 0.56 mm, width 0.48 mm, undersides of lateral margins with a single row of setae.

VENTRUM. Proventrum narrow in front of procoxae, with rows of foveae along the anterior and posterior margins, coxal cavities open behind ( Fig. 2C ). Mesoventrum, without reticulation or pubescence, collar sloping posteriorly for a short distance onto lateral margins, without distinct humeri, with a narrow raised medial ridge extending posteriorly to raised, rounded projection, not extending between the mesocoxae, posterior margin of keel with a pair of deep fringed sulci ( Fig. 2E ). Mesocoxae separated by almost half their width ( Fig. 2E ). Metaventrum with scattered pubescence and strongly raised anterior margin between mesocoxae, posterior margin forming a narrow bifid projection between metacoxae, mesepiventral sutures apparent reaching posteriorly from mesocoxae to lateral margins. Wings of usual Sindosium type.

FEMALE GENITALIA. Spermatheca ( Fig. 2B ).

MALE GENITALIA. Not known.

Figures

Fig. 2. Sindosium collinsi sp. nov. A. Habitus. B. Spermatheca. C. Ventral aspect of head and pronotum ×630. D. Pronotum ×510. E. Meso- and metaventra ×475.