Mesoceration umbrosum, Perkins, 2008

Perkins, Philip D., 2008, Facial affect recognition in individuals at clinical high risk for psychosis, Zootaxa 1864, pp. 1-124 : 58-59

Mesoceration umbrosum new species

( Figs. 83 , 87 , 102 )

Type Material. Holotype (male): South Africa: Western Cape Province, Wiedouw farm, river stones, 31° 43' S, 18° 43' E, 19 August 1983, Endrödy­Younga (#1945). Deposited in the TMSA . Paratypes (161): Western Cape Province, Same data as holotype (143 TMSA) ; Gifberg Pass, 31° 46' S, 18° 46' E, 2 January 2005, P. S. Cranston (5 MCZ) ; W. Wiedouw farm, shore washing, 31° 43' S, 18° 43' E, 19 August 1983, Endrödy­Younga (#1946) (13 TMSA) .

Differential Diagnosis. Among truncatum group members, M. umbrosum ( Fig. 83 ) is very similar to M.

truncatum in size, shape, color, and dorsal sculpture; reliable determinations will require examination of the male genitalia ( Fig. 87 ).

Description. Size (length/width, mm) holotype: body (length to elytral apices) 1.63/0.63; head 0.29/ 0.40; pronotum 0.33/0.43; elytra 0.98/0.63. Dorsum of head, pronotal disc, and venter piceous; lateral margins of pronotum, elytra, and maxillary palpi rufobrunneous; last article of maxillary palpi darker than others.

Head with labrum and clypeus effacedly microreticulate, finely sparsely punctate, weakly shining. Frons markedly microreticulate laterally, disc effacedly microreticulate and densely, rather coarsely punctate, punctures much larger than clypeal punctures, punctures separated by 1xpd or less; anteocellar sulci deep. Ocelli distinct. Mentum and submentum microreticulate.

Pronotum cordate, widest at midlength; anterior angles rounded, posterior rectangular; sides finely margined, feebly crenulate; anterior margin shallowly arcuate over median 3/4, without hyaline border; subrugulose, densely, moderately coarsely punctate, reliefs effacedly microreticulate, foveae more markedly microreticulate; with 10 distinct foveae: two median, an anterior elongate and round posterior, shallowly confluent; a small round anterior and larger oval posterior admedian; and a large anterior and smaller posterior adlateral on each side; each puncture with a fine short seta.

Elytra with sides weakly arcuate, apices truncate in male, less so in female; sutural apices rectangular; sides smooth, weakly explanate. Serial punctures moderately small, basally about 1–2xpd of largest pronotal punctures, progressively finer apically, basal punctures separated by about 1xpd or less; each puncture with small granule at anterior margin; series 1 weakly striate­impressed in basal 1/2; at midlength with seven series between suture and carina; 5th and 6th series confluent in basal 1/3. Intervals, except 8th, weakly rounded, width on disc about 2xpd, each with unilinear row of granules, each about 1xef; 8th strongly costate. All punctures bearing a short fine seta.

Thoracic ventrites and abdominal ventrites 1–4 densely clothed with short setae, except glabrous proventral midlongitudinal ridge, mesoventral plaques, and small glabrous strongly shining triangular area basomedially on metaventrite. Abdominal ventrites as follow: 1st with submedial and sublateral basal carina on each side; 5th similarly clothed basally and laterally, leaving a semilunulate posterior area glabrous and shining; 6th glabrous and obsoletely microreticulate, with posterior band of piliferous punctures.

Legs of male with two spiniform setae on apical protarsomere. Femora and tibiae effacedly microreticulate.

Females with explanate margin of elytra wider than in males, apices more distinctly obliquely truncate.

Wings fully developed on holotype and all dissected males.

Aedeagus length ca. 0.35 mm; main­piece straight in ventral view, widest near midlength, with short apical process on left side; distal process comparatively long, weakly arcuate, distinctly widened near midlength, gonopore small; parameres extended well beyond apex of main­piece ( Fig. 87 ).

Etymology. Named in reference to the dark, obscure coloration.

Distribution. Currently known from two closely spaced localities in the Western Cape Province ( Fig. 102 ).

Figures

FIGURE 83. Mesoceration umbrosum, dorsal and lateral habitus of holotype.

FIGURES 84–87. Mesoceration, aedeagi of holotypes. —84. M. brevigranum. —85. M. granulovestum. —86. M. truncatum. —87. M. umbrosum.

FIGURES 101–102. Geographical distributions of Mesoceration species.