Psammoecus marginicollis Grouvelle, 1908

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 : 18-20

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.3858696
persistent identifier	https://treatment.plazi.org/id/03BB8D13-E106-FF88-FDBC-7C5A875AFBAE
treatment provided by	Carolina
scientific name	Psammoecus marginicollis Grouvelle, 1908
status

Treatment

( Fig. 8 View Fig )

Material examined

Holotype

Other material

Differential diagnosis

Ps. marginicollis differs from Ps. personatus and Ps. leleupi sp. nov. by the shorter lateral teeth of pronotum; from Ps. laetulus and Ps. parallelus by 1 st antennomere being two times as long as 2 nd; from Ps. hacquardi by wider, less elongate parameres and longer antennae; from Ps. leleupi sp. nov. by narrower elytral striae and parameres without club-shaped extension; from Ps. parallelus by wide parameres without club-shaped extension; from Ps. luchti sp. nov. by narrower bases of lateral teeth of pronotum and wider, less elongate parameres.

Redescription

BODY. Elongate oval, total length 2.50-3.50 mm ( Fig. 8A View Fig ). Surface yellowish to reddish brown, some specimens considerably darker with lateral margins of pronotum blackish brown. Elytra with variable pattern of dark maculae; darker specimens with wide, horizontal maculae in the middle of the elytra and dark apical portion of elytral suture; the basal portion of the eltral suture not darkened. Specimens of lighter colour with reduced maculae on the elytral discs and only slightly darkened or light apical portion of elytral suture. Few specimens without elytral maculae. Antennae yellowish or reddish brown, 7 th to 10 th antennomere dark brown or black, 11 th antennomere yellowish brown, lighter than basal antennomeres.

HEAD. Broad, temples rounded; width 0.65-0.76 mm, length 0.40-0.46 mm, 1.58-1.83 times as wide as long. Eyes moderately prominent, 0.20-0.23 mm long, distance of inner margins 0.43-0.53 mm. Puncturation on vertex variable, moderately dense, sometimes very dense. Pubescence composed of long, semierect setae, directed anteriorly; microsculpture hardly visible, very shallow, reticulate. Longitudinal impressions on vertex deep, attaining the anterior third of eyes. Antennae as in Fig. 8B View Fig , 1.58-1.70 mm long. Antennomere proportions of holotype as follows: 2.0: 1.1: 1.3: 1.4: 1.5: 1.2: 1,1: 1.0:1.0: 1.1: 2.1.

PRONOTUM. Subquadrate, width 0.70-0.85 mm, length 0.56-0.70 mm, 1.16-1.42 times as wide as long. Surface even. Anterior angle with distinct group of small teeth. Lateral margin with five distinct, short teeth; tooth I short with wide base, tooth II a little larger, teeth III and IV still a little larger, triangular with wide bases, tooth V about as big as tooth II. Posterior angle with very small tooth. Puncturation on pronotal disc coarser and denser as on vertex, pubescence as on vertex. Microsculpture variable, in most specimens well defined, reticulate, in some specimens hardly visible or absent.

ELYTRA. Elongate oval, length 1.63-2.30 mm, width 1.13-1.50 mm, 1.32-1.71 times as long as their combined width. Rows of punctures on the disc a little narrower than interstices. Pubescence composed of long, semierect setae; microsculpture absent.

PARAMERES. Short, broadest in the middle, with one large apical seta ( Fig. 8C View Fig ).

Remarks

The shape of the parameres was found to vary to a small degree. So far, the material at hand was not sufficient to decide wether this variability has specific importance, hence all specimens mentioned here were determined to be conspecific with Ps. marginicollis .