Psammoecus hacquardi Grouvelle, 1889

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 : 5-7

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.3858722
persistent identifier	https://treatment.plazi.org/id/03BB8D13-E113-FF9D-FD8E-7DEE815FFBAC
treatment provided by	Carolina
scientific name	Psammoecus hacquardi Grouvelle, 1889
status

Treatment

( Fig. 2 View Fig )

Psammoecus haequardi [sic.] Grouvelle, 1908b: 185.

Material examined

Lectotype

♀, by present designation: ‘ Zanzibar | Raffray’ [blue label, Grouvelle’s hand], ‘Type’ [red label], ‘MUSEUM PARIS | 1917 | Coll. GROUVELLE’ [blue label], ‘Hacquardi | A. Grou’ [not Grouvelle’s hand] ( MNHN).

Paralectotype

♀, by present designation, with identical data as Lectotype ( MNHN).

Other material

Differential diagnosis

Ps. hacquardi differs from Ps. marginicollis by the shape of the parameres and shorter antennae; from Ps. personatus by the 1 st antennomere being more than two times longer as 2 nd; from Ps. leleupi sp. nov. by the narrower elytral striae; from Ps. laetulus by the maximum pronotal width being closer to the middle; from Ps. parallelus by more extensive dark maculae on elytra, darkened elytral basis and slender shape

of parameres; from Ps. luchti sp. nov. by narrow bases of lateral teeth of pronotum, narrower elytral striae and darkened elytral bases.

Redescription

BODY. Elongate-oval, total length 2.40-3.05 mm ( Fig. 2A View Fig ). Surface yellowish to reddish brown, elytra with variable patterns of maculae; the basic pattern consists of brown or blackish brown maculae at the elytral bases, sutures, lateral margins and apices. Specimens of lighter colour show no darker coloration on anterior half of elytral suture and posterior half of lateral margins; very dark specimens have dark elytra with light brown maculae on the anterior and posterior aspects of the disk. Antennae as in Fig. 2B View Fig , yellowish brown; 6 th to 10 th and apical half of 5 th antennomere brown to blackish-brown, 11 th antennomere yellowish brown, sometimes a little lighter than basal antennomeres.

HEAD. Broad, temples immediately narrowed behind eyes; width 0.65-0.74 mm, length 0.38-0.44 mm, 1.61-1.80 times as wide as long. Eyes moderately protuberant, 0.19-0.23 mm long, distance of inner margins 0.40-0.48 mm. Puncturation on vertex moderate, density of punctures in some specimens irregular, varying from sparse to very dense. Pubescence composed of long, semierect setae, directed anteriorly; microsculpture distinct, reticulate. Longitudinal impressions on vertex distinct, almost attaining the middle of the eyes. Antennae comparatively short, 1.30-1.43 mm long; antennomere proportions of lectotype as follows: 2.8: 1.0: 1.7: 1.1: 1.5: 1.3: 1.2: 1.2:1.2: 1.2: 2.7.

PRONOTUM. Broad, some specimens with shallow impressions close to the apical margin; width 0.65- 0.78 mm, length 0.50-0.60 mm, 1.27-1.33 times as wide as long. Anterior angles with distinct groups of small, short teeth; lateral margins with five teeth, tooth I very short and slender, tooth II longer and wider than tooth I, tooth III longer than tooth II, tooth IV a little shorter than tooth III, tooth V very small; posterior angle with a very small, almost obtuse tooth. Puncturation on disc denser than on vertex, punctures sometimes hardly separated. Pubescence as on vertex; microsculpture distinct, reticulate.

ELYTRA. Elongate-oval, length 1.50-1.90 mm, combined width 0.98-1.30 mm, 1.46-1.67 times as long as combined width. Rows of punctures on disc narrower than interstices. Pubescence composed of long, semierect setae; microsculpture absent.

PARAMERES. Slender, short, with dense rows of small setae at the inner margins of their bases and two larger setae at their apices. ( Fig. 2C View Fig ).

Remarks

The determination of single female specimens, especially if they are lightly colored or immature, can be difficult. Grouvelle (1908b) spells the name ‘Haequardi’, which is to be considered a misspelling.