Psammoecus hacquardi Grouvelle 1889
Creators: name: Karner, Michael
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Silvanidae
Psammoecus
Psammoecus hacquardi

description: Psammoecus hacquardi Grouvelle, 1889
(Fig. 2)
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
2 spms ‘ Tanzanie: Mts. Uluguru | Kiroka, for. héliophile | alt. 725 m sous écorces | 27-31/V/71 ’, ‘ Coll. Mus. Tervuren | Mission Mts. Uluguru | L. Berger, N. Leleup | J. Debecker V/VIII/71’ (MRAC). 3 spms ‘ Tanzanie: Mts. Uluguru | Kiroka, for. héliophile | alt. 600 m 24-30/VII/71 | dans arbres morts’, ‘Coll. Mus. Tervuren | Mission Mts. Uluguru | L. Berger, N. Leleup | J. Debecker V/VIII/71’ (MRAC, 1 spm MKF). 1 spm ‘ Tanzanie: Mts. Uluguru | Kiroka, for. héliophile | alt. 600 m 24-30/VII/71’, ‘Coll. Mus. Tervuren | Mission Mts. Uluguru | L. Berger, N. Leleup | J. Debecker V/VIII/71’ (MRAC). 2 spms ‘A la lumière’ [blue label], ‘I.R.S.A.C.-MUS.CONGO | Kivu: Terr Masisi, 720 m. | Walikale (Rives Loa) IX-53 | N. Leleup’ (MRAC, MKF). 3 spms ‘Dans | humus | en forêt’ [blue rectangular label], ‘I.R.S.A.C.- MUS.CONGO | Kivu: Terr Masisi, 800 m. | Mutakato IX-53 | N. Leleup’, (MRAC). 1♀ ‘MUSÉE DU CONGO | Eala | XI-1934 | J. Ghesquiére’ (MRAC). 3 spms ‘MUSÉE DU CONGO | Eala | 10-VII-1936 | J. Ghesquiére | 2873’ (MRAC). 1♂ ‘MUSÉE DU CONGO | Eala | VII-1936 | J. Ghesquiére | 2875’, (MRAC). 1♀ ‘I.R.S.A.C.-MUS.CONGO | Bolobo (fleuve Congo | 5-X-1949 | N. Leleup’, (MRAC). 1 spm ‘COLL. MUS. TERVUREN | Côte d‘ivoire: Bingerville | XI. 1961 | J. Decelle’, (MRAC). 4 spms ‘COLL. MUS. TERVUREN | Côte d‘ivoire: Bingerville | VIII. 1962 | J. Decelle’ (MRAC, 1 spm MKF). 2 spms ‘COLL. MUS. TERVUREN | Côte d’ivoire: Bingerville | IX. 1962 | J. Decelle’ (MRAC). 1 spms ‘COLL. MUS. TERVUREN | Côte d’ivoire: Bingerville | X. 1962 | J. Decelle’, (MRAC). 1 spm ‘COLL. MUS. TERVUREN | Côte d’ivoire: Bingerville | XI. 1962 | J. Decelle’ (MRAC). 1 spm ‘COLL. MUS. TERVUREN | Côte d’ivoire: Bingerville | IX. 1963 | J. Decelle’ (MRAC).
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). 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, 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).
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.
description: Published as part of 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, pp. 1-31 in European Journal of Taxonomy 17 (17) on pages 5-7, DOI: 10.5852/ejt.2012.17, http://zenodo.org/record/3857844