Mesoceration barriotum, Perkins, 2008

Perkins, Philip D., 2008, Facial affect recognition in individuals at clinical high risk for psychosis, Zootaxa 1864, pp. 1-124 : 37-38

Mesoceration barriotum new species

( Figs. 51 , 55 , 90 )

Type Material. Holotype (male): South Africa: Western Cape Province, Cape­Swartberg, Seweweekspoort Kloof , river stones, 33° 24' S, 21° 21' E, 18 November 1973, Endrödy­Younga (#269). Deposited in the TMSA . Paratypes (139): Eastern Cape Province, Cape, Swartberg, Baviaanskloof niver Konsaniver , WB:178, water collection, 33° 38' S, 24° 15' E, 21 October 1979, W. Breytenbach (1 TMSA) ; Joubertskraal River, at Joubertskraal Farm , stones in current; SCR 120, 33° 46' S, 24° 10' E, 1 December 1993, F. C. de Moor & H. M. Barber­James (5 AMG) ; Joubertskraal River, on Nooitgedacht road, stones in current; SCR 143, 33° 49' S, 24° 14' E, 12 March 1994, H. M. Barber­James & S. J. Mangold (1 AMG) ; Little Karroo, Baviaanskloof N valley, river stones, 33° 37' S, 24° 15' E, 28 October 1993, Endrödy­Younga (#2916) (3 TMSA) ; Little Karroo, Baviaanskloof , river stones, 33° 38' S, 24° 15' E, 28 October 1993, Endrödy­Younga (#2914) (21 TMSA) ; Rachels River, at Nooitgedacht Farm , stones in current; SCR 116, 33° 47' S, 24° 15' E, 1 December 1993, F. C. de Moor & H. M. Barber­James (1 AMG) ; Wit River (trib. of Gamtoos River), stones in current, (fish), GAM Stn. 1: 3BD, 33° 39' S, 24° 31' E, 13 August 1986, F. de Moor & N. Köhly (1 AMG) ; Wit River (trib. of Gamtoos River), stones in current, GAM Stn. 1: 1B, 33° 39' S, 24° 31' E, 18 June 1986, F. de Moor & N. Köhly (4 AMG) ; Western Cape Province, Cape­Swartberg, Seweweekspoort Kloof , river stones, 33° 24' S, 21° 21' E, 18 November 1973, Endrödy­Younga (#269) (10 TMSA) ; Cape­Swartberg, Swartbergpas , N. side, water coll., river, 33° 18' S, 20° 2' E, 22 March 1979, W. Breytenbach (WB:136) (20 TMSA) ; Langeberg, Ruiterbos For. St. , river stones, 33° 54' S, 22° 2' E, 4 November 1993, Endrödy­Younga (#2942) (2 TMSA) ; Little Karroo, Kammanasieberge , river stones, 33° 37' S, 22° 33' E, 21 November 1992, Endrödy­ Younga (#2930) (12 TMSA) ; Little Karroo, Kammanasieberge , water and shore, 33° 37' S, 22° 33' E, 21 November 1992, Endrödy­Younga (#2931) (1 TMSA) ; Little Karroo, Raubenheimer Dam , shore washing, after debris removed, 33° 25' S, 22° 19' E, 21 October 1993, Endrödy­Younga (#2889) (2 TMSA) ; Little Kar­ roo, Raubenheimer Dam , sifted shore debris, 33° 25' S, 22° 19' E, 21 October 1993, Endrödy­Younga (#2887) (2 TMSA) ; Little Karroo, Raubenheimer Dam , water collection, 33° 25' S, 22° 19' E, 21 October 1993, Endrödy­Younga (#2886) (2 TMSA) ; Little Karroo , Rus­en­vredewaterf, from waterfall, 33° 24' S, 22° 22' E, 22 October 1993, Endrödy­Younga (#2896) (8 TMSA) ; Little Karroo, Schoemanspoort , river stones, 33° 25' S, 22° 14' E, 22 October 1993, Endrödy­Younga (#2895) (29 TMSA) ; Swartberg, Meiringspoort cent., shore washing, 33° 25' S, 22° 33' E, 1 November 1993, Endrödy­Younga (#2925) (4 TMSA) ; Uniondale , elev. 800 m, 33° 45' S, 22° 58' E, 1 January 1994, Wewalka (10 NMW) .

Differential Diagnosis. M. barriotum is recognized among barriotum group members by the carinate 8th elytral interval ( Fig. 51 ). The aedeagus shows some similarity to that of M. incarinum ( Figs. 55, 56 ).

Description. Size (length/width, mm) holotype: body (length to elytral apices) 1.53/0.61; head 0.27/ 0.38; pronotum 0.34/0.44; elytra 0.91/0.61. Head and pronotal disc piceous to rufo­piceous, remainder of dorsum brunneous to rufo­brunneous, maxillary palpi testaceous, tip darker, venter piceous, mentum rufescent, legs testaceous.

Head with labrum microreticulate, feebly shining. Clypeus microreticulate laterally, shining and sparsely punctulate medially. Frons shining, microreticulate only at sides, sparsely finely punctulate on disc, punctures separated by about 3xpd; anteocellar sulci moderately deep. Ocelli distinct. Mentum microreticulate.

Pronotum cordate, widest in front of middle; anterior angles obsolete, posterior rectangular; sides finely margined, feebly crenulate; anterior margin shallowly arcuate over median 3/4, without hyaline border; moderately convex, moderately densely punctate on discal reliefs, punctures larger than those on frons, anteriorly and posteriorly punctures much larger, very strongly and distinctly, almost rugosely, punctate; with 10 distinct foveae disposed as follows: two median, an anterior elongate and round posterior, shallowly confluent; a small round anterior and larger oval posterior admedian; and a large anterior and slightly smaller deep posterior adlateral on each side, foveae dull; each puncture with a fine short seta.

Elytra dull, almost parallel­sided, apices widely rounded; sutural apices rectangular; sides smooth, weakly explanate. Serial punctures quite large at base, progressively slightly finer apically, largest punctures ca. 1xpd of largest pronotal punctures; seven series between suture and carina, 6th interval discrete to base; anterior rim of socket of each punctural seta with minute granule. Intervals, except 8th, flat but with uneven surfaces, dull, width on disc about 1xpd, as are interstices between serial punctures; most intervals with very sparse unilinear row of minute granules; 8th distinctly carinate. All punctures bearing a short fine seta.

Thoracic ventrites and abdominal ventrites 1–4 densely clothed with short setae, except glabrous midlongitudinal ridge on proventrite, mesoventrite plaques, and small glabrous strongly shining triangular area basomedially on metaventrite. Abdominal ventrites as follow: 1st with very weak sublateral basal carina on each side; 5th similarly clothed over basal 2/3, apical 1/3 glabrous and shining; 6th glabrous, with posterior band of piliferous punctures.

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

Females with elytral explanate margin slightly wider, elytral apices more distinctly transversely truncate; pronotal anterior angles slightly more produced than in males.

Wings fully developed on holotype and all dissected males.

Aedeagus length ca. 0.25 mm; main­piece short and stout, arcuate in lateral view, basal ring large; distal piece short, upturned in lateral view ( Fig. 55 ).

Etymology. Latin, barriotum , to trumpet like an elephant (see aedeagus).

Distribution. Widely distributed in southern Western Cape Province and southern Eastern Cape Province ( Fig. 90 ).

Figures

FIGURE 51. Mesoceration barriotum, dorsal and lateral habitus of holotype.

FIGURE 90. Allopatric geographical distributions, lateral habitus, and aedeagi of three species in the Mesoceration barriotum group.

FIGURES 55–58. Mesoceration, aedeagi of holotypes. —55. M. barriotum. —56. M. incarinum. —57. M. semicarinulum. —58. M. compressum.