Psammoecus parallelus Grouvelle, 1919

Karner, Michael, 2012, A revision of African Psammoecus (Coleoptera, Silvanidae) and descriptions of two new species from the collection of the Musée royal de l’Afrique centrale, European Journal of Taxonomy 17, pp. 1-31 : 9-11

publication ID	https://doi.org/ 10.5852/ejt.2012.17
publication LSID	lsid:zoobank.org:pub:1238951A-FE17-40B2-9DCD-9D7939BECD09
DOI	https://doi.org/10.5281/zenodo.3858732
persistent identifier	https://treatment.plazi.org/id/03BB8D13-E11F-FF91-FD80-79238081F932
treatment provided by	Carolina
scientific name	Psammoecus parallelus Grouvelle, 1919
status

Treatment

( Fig. 4 View Fig )

Material examined

Holotype

Other material

Differential diagnosis

Differs from Ps. personatus and Ps. leleupi sp. nov. by the shorter lateral teeth of pronotum; from Ps. leleupi sp. nov. also by narrower elytral striae, round dark maculae in posterior third of elytra, darkened suture near elytral apex, and the absence of a darkened area at bases of elytra; from Ps. hacquardi and Ps. laetulus by round dark maculae in posterior third of elytra, darkened suture near elytral apex, the absence of a darkened area at bases of elytra and very wide bases and club-shaped extensions of parameres; from Ps. marginicollis by 1 st antennomere being almost three times as long as 2 nd and from Ps. marginicollis and Ps. luchti sp. nov. by very wide bases and club-shaped extensions of parameres.

Redescription

BODY. Slender, total length 2.85-3.30 mm ( Fig. 4A View Fig ), surface yellowish-brown, elytra with round dark maculae at beginning of posterior third near lateral margins, suture darkened along posterior third. Antennae yellowish brown, 7 th- 10 th and apex of 6 th antennomere brown, 11 th antennomere lighter reddishbrown, but somewhat darker than basis of antennae.

HEAD. Wide, temples curved; width 0.48-0.78 mm, length 0.40-0.45 mm, 1.41-1.82 times as wide as long. Eyes protuberant, 0.21-0.23 mm long, distance of inner margins 0.48-0.53 mm. Puncturation on vertex coarse, dense, density of punctures variable. Pubescence composed of long, semierect setae, directed anteriorly; microsculpture visible only in few specimens, very shallow, reticulate. Longitudinal impressions on vertex distinct, extending slightly behind middle of eyes. Antennae as in Fig. 4B View Fig , slender, 1.35-1.63 mm long; antennomere proportions of holotype as follows: 2.9: 1.2: 1.4: 1.5: 1.5: 1.3: 1.2: 1.1: 1.0: 1.0: 2.2.

PRONOTUM. Subquadrate, 0.73-0.81 mm wide, 0.60-0.68 mm long, 1.19-1.26 times as wide as long. Anterior angles with distinct group of small teeth; lateral margins with five teeth, tooth I small, teeth II and III larger, of similar size, teeth IV and V as big as tooth I; posterior angles with small tooth. Puncturation and pubescence on disc as on vertex, microsculpture absent.

ELYTRA. Oval, length 1.80-2.10 mm, combined width 1.03-1.25 mm, 1.67-1.76 times as long as their combined width. Rows of punctures on disc slightly wider than interstices; pubescense composed of long, semierect setae, directed posteriorly; microsculpture absent.

PARAMERES. With very large base and club-shaped apical extension. Inner margins of base and apical extension with numerous setae of variable size, apex with one large seta ( Fig. 4C View Fig ).