Alexidia convivalis, Groll, 2025

Alexidia convivalis sp. nov.

urn:lsid:zoobank.org:act:15C92174-46F7-4EAB-8406-88CEA582294F

Figs 1A–B, G View Fig , 6–11 View Fig View Fig View Fig View Fig View Fig View Fig

Diagnosis

Body length: 1.41–1.55 mm. Oval, in dorsal view, and convex in lateral. Brown to dark brown, edges of some sclerites reddish; shining. Sutural, basal, and lateral striae joined. Almost glabrous and lacking coarse punctures. Submetacoxal area short.

Etymology

The species epithet is a Latin word meaning ‘feast’, ‘banquet’, because of the great feast they were having, all the time specimens were collected among other Alexidia and many Baeocera species.

Material examined

Holotype

BRAZIL • ♂; Minas Gerais, Viçosa, EPTEA Mata do Paraíso ; 24 Mar. 2022; E. von Groll et al. leg.; “Fungo 20 / Em Ceratiomyxa fruticulosa em Pinus / HOLOTYPE ♂ ”; CELC. ( Fig. 6D–E View Fig )

Paratypes

BRAZIL • 1 ex.; same locality as for holotype; 12 Nov. 2019; LabCol leg.; “Fungo 10 / Em Ceratiomyxa fruticulosa ”; CELC • 6 ♂♂, 7 ♀♀ (1 ♂ *, 1 ♂ **, 1 ♀ **,); same locality as for holotype; 10 Mar. 2022; LabCol leg.; “Falcon 26 / Em Ceratiomyxa fruticulosa em Pinus ”; CELC • 1 ♂, 1 ♀; same locality as for holotype; 24 Mar. 2022; E. von Groll et al. leg.; “Fungo 20 / Em Ceratiomyxa fruticulosa em Pinus ”; CELC • 1 ♂, 1 ♀; same locality as for holotype; 14 Apr. 2022; LabCol leg.; “Falcon 42 / Em Ceratiomyxa fruticulosa em Pinus ”; CELC .

Description

COLOURATION. Dark brown, edges of some sclerites reddish; distal part of femora and tibiae lighter, tarsi, mouthparts and antennomeres I–VI yellow ( Fig. 6A–C, H View Fig ). Variation: light brown and not reddish ( Fig. 6F–G View Fig ).

HEAD. Frons smooth, subglabrous, devoid of punctures ( Fig. 6H View Fig ). Clypeus longer than wide ( Fig. 6H–I View Fig ). Labrum rounded apically ( Fig. 7A View Fig ). Mandible elongate ( Fig. 7B–C View Fig ). Last maxillary palpomere 1.70 × as long as previous ( Fig. 7D View Fig ). Last labial palpomere not strongly curved ( Fig. 7E–F View Fig ). Mentum laterally constricted ( Fig. 7F View Fig ). Three submaxillary ducts ( Fig. 7G View Fig ). Gular region with strigulate microsculpture and few and sparse gular pores; gular suture short, more than 2× distant from submentum ( Fig. 7G View Fig ). Antennomeres VIII, IX, and XI slender.Antennomere proportions (n =2): I 98/32: II 88/36: III 56/16: IV 84/16: V 98/17: VI 89/17: VII 97/25:VIII 77/17: IX 112/27: X 105/35: XI 113/35 ( Fig. 6J–K View Fig ).

PROTHORAX. Smooth, lacking microsculpture ( Figs 6A, F View Fig , 7H–I View Fig , 11A View Fig ). Pronotum strongly curved in lateral view ( Figs 6B, G View Fig , 11B View Fig ); punctation very fine; pubescence sparse and short; posterior angles not trespassing mesenepisternum. Hypomeron almost glabrous ( Figs 6G View Fig , 11C View Fig ). Notosternal suture curved inward ( Fig. 7J View Fig ). Prosternal process long and acute ( Fig. 7K View Fig ). Profurca thin and elongate ( Fig. 7L View Fig ). Prothoracic corbiculum shortly pubescent ( Fig. 7L View Fig ).

MESOTHORAX. Lacking microsculpture, almost glabrous ( Figs 6B, G View Fig , 8E–F View Fig , 11B–C View Fig ). Scutellar lines straight in middle, forming two lateral lobes ( Fig. 8C View Fig ). Mesepimeron short and oblique ( Fig. 8F View Fig ). Procoxal rests triangular, wide ( Fig. 8D View Fig ). Mesoventral lines oblique ( Fig. 8D View Fig ). Median and secondary lines absent. Mesoventral process sinuous ( Fig. 8G View Fig ).

METATHORAX. Metaventrite smooth, devoid of punctures; pubescence sparse ( Figs 6B, G View Fig , 8E–F View Fig , 11B–C View Fig ). Submesocoxal lines punctate; submesocoxal area micropunctured; length: 0.04–0.05 ( Figs 6A, G View Fig , 8F View Fig , 11C View Fig ). Metanepisternum mostly covered by elytra ( Figs 6A, G View Fig , 8F View Fig , 11C View Fig ). Metanotum with alacrista triangular and wide; median membranous area wide; scutoscutellar suture oval and flattened ( Fig. 8H View Fig ). Metepimeron distinct, smooth. Intercoxal plates rectangular ( Figs 6A, G View Fig , 8F View Fig , 11B–C View Fig ). Metendosternite thick; stalk, and ventral longitudinal flange elongate ( Fig. 8I–K View Fig ).

WINGS. Elytra wider anteriorly; shining; lacking microsculpture; finely punctate; moderately pubescent ( Figs 6A, F View Fig , 8L–M View Fig , 11A View Fig ). Sutural striae joined to basal and then, to lateral striae ( Figs 6A–B, F–G View Fig , 7H View Fig ). Adsutural area wider near posterior ⅔. Epipleura impunctate ( Fig. 8F View Fig ). Hind wings fully developed ( Fig. 9A View Fig ).

LEGS ( Figs 9B–G View Fig , 11D–I View Fig ). Pro- and mesofemora sparse and coarsely punctate. Femora narrow. Meso- and metatibiae bearing a long apical spine.

ABDOMEN. Subglabrous, shining; primary setae present. Lateral of ventrite I and tergite VI with micropuncture ( Figs 6B View Fig , 11B View Fig ). Tergite VI bearing few setae ( Figs 9H View Fig , 11J View Fig ).

Males

Antennae slightly thinner than in females ( Fig. 6J–K View Fig ). Pro- and mesotarsomeres I–III slightly widened, bearing tenent setae ( Fig. 9C, E View Fig ). Metatibia arcuate ( Fig. 9F View Fig ). Ventrite VIII with a short posterior projection ( Fig. 9I View Fig ); tergite VIII straight posteriorly ( Fig. 9J View Fig ); both tergite and ventrites VIII punctate and not microsculptured. Tergite IX with rounded ventral struts ( Fig. 9K View Fig ); sternite IX thick, with strigulate microsculpture ( Fig. 9L View Fig ); tergite X triangular ( Fig. 9M View Fig ).

AEDEAGUS ( Fig. 10A–J View Fig ). Curved in lateral view; basal bulb poorly sclerotized; apical lobe sclerotized. Parameres long and thin; sclerite tripartite and symmetrical ( Fig. 10E–J View Fig ).

MEASUREMENTS (n =9, including holotype, unless otherwise specified; in mm). TL (n= 8) 1.44–1.50 (1.46 ± 0.02), SY 0.17–0.20 (0.18 ± 0.01), HW 0.36–0.40 (0.39 ± 0.01), IS 0.18–0.22 (0.19 ±0.01), WA 0.10–0.13 (0.12±0.01), PL (n= 8) 0.54–0.60 (0.57± 0.02), PA 0.42–0.47 (0.44 ± 0.02), PB 0.93–0.97 (0.95 ± 0.01), EI 0.96–1.05 (1.00± 0.03), EL 1.05–1.12 (1.08± 0.03), EW 0.48–0.54 (0.50 ± 0.02), EH 0.42–0.49 (0.46± 0.02), MsW 0.20–0.26 (0.23± 0.02), MeL 0.06–0.12 (0.09± 0.02), MeW (n= 8) 0.03– 0.04 (0.03 ±0.01), MB 0.10–0.13 (0.12 ± 0.01), MC 0.30–0.35 (0.32 ± 0.02), ML 0.04–0.05 (0.04 ±0.005), VL 0.25–0.28 (0.26 ±0.01), VL2 (n =8) 0.22–0.27 (0.25 ± 0.02); PrF 0.37–0.42 (0.40 ± 0.02), PrT 0.25–0.31 (0.29 ±0.02), MsF 0.40–0.47 (0.44± 0.02), MsT 0.35–0.41 (0.38± 0.02), MtF 0.44–0.50 (0.49 ± 0.02), MtT 0.43–0.49 (0.47 ±0.02).

Females ( Fig. 11 View Fig )

Tarsi not enlarged and lacking tenent setae ( Fig. 11G–I View Fig ). Ventrite VIII with a triangular projection ( Fig. 11K View Fig ) and tergite VIII straight posteriorly ( Fig. 11L View Fig ) – both microsculptured. Spermatheca elongate and twisted, forming a circular structure; spermathecal duct filiform ( Fig. 11M View Fig ). Distal gonocoxite long and slender, somewhat arcuate ( Fig. 11M–N View Fig ). Gonostylus about 2× as long as wide, tapering posteriorly ( Fig. 11M–N View Fig ).

MEASUREMENTS (n =9, in mm). TL 1.41–1.55 (1.50 ± 0.04), SY 0.15–0.19 (0.18± 0.01), HW 0.39–0.41 (0.40 ±0.01), IS 0.18–0.21 (0.19 ± 0.01), WA 0.11–0.14 (0.12 ±0.01), PL 0.54–0.63 (0.59 ± 0.03), PA 0.43–0.47 (0.45 ± 0.01), PB 0.88–0.98 (0.95± 0.03), EI 0.95–1.04 (1.01 ± 0.03), EL 1.03–1.14 (1.11 ±0.03), EW 0.44–0.55 (0.51 ±0.04), EH 0.43–0.49 (0.46 ±0.02), MsW 0.20–0.27 (0.24 ± 0.02), MeL 0.05–0.13 (0.09 ±0.02), MeW 0.02–0.04 (0.03± 0.01), MB 0.10–0.14 (0.12 ±0.01), MC 0.29–0.38 (0.33± 0.03), ML 0.04–0.06 (0.05 ±0.01), VL 0.25–0.33 (0.28 ± 0.02), VL2 0.24–0.28 (0.26 ±0.01), PrF 0.39–0.42 (0.41 ± 0.01), PrT 0.28–0.31 (0.30 ±0.01), MsF 0.42–0.46 (0.45 ±0.01), MsT 0.35–0.41 (0.38 ± 0.02), MtF 0.45–0.50 (0.48 ± 0.02), MtT 0.45–0.49 (0.48 ± 0.01).

Host

Collected from Ceratiomyxa fruticulosa T.Macbr. (Protozoa) on a fallen Pinus sp. tree ( Fig. 1G View Fig ).

Remarks

The aedeagus is very similar to that of A. plaumanni but it can be easily distinguished by the external morphology: smaller body length, the metaventrite and abdomen are not punctate, and the elytral punctation is not coarse.

Distribution

Mata do Paraíso, Universidade Federal de Viçosa, campus of Viçosa, state of Minas Gerais, Southeast Brazil ( Fig. 1A–B, G View Fig ).