Cerasommatidia plaumanni

Arriaga-Varela, Emmanuel, Tomaszewska, Wioletta, Szawaryn, Karol, Robertson, James, Seidel, Matthias, Ślipiński, Adam & Fikáček, Martin, 2023, The resurrection of Cerasommatidiidae, an enigmatic group of coccinelloid beetles (Coleoptera: Coccinelloidea) based on molecular and morphological evidence, Zoological Journal of the Linnean Society 197 (4), pp. 1078-1115 : 1091-1092

CERASOMMATIDIA PLAUMANNI ( PAKALUK & ŚLIPIŃSKI, 1990) COMB. NOV.

( FIGS 3B–E , 5A–H , 20B )

Ibicarella plaumanni Pakaluk & Ślipiński, 1990: 718 . – Shockley et al., 2009: 28.

Material examined: Paratypes: B RAZIL: Santa Catarina: Nova Teutonia, F. Plaumann, X.72/ Ibicarella plaumanni sp. n., det. S.A. Ślipiński 87/ Paratype (2 ex., MIZ); same locality data/ Cerylonid group? Endomychidae , Ibicarella sp. [R. A. Crowson adult Coleoptera slide] (1 male, BMNH).

Diagnosis: Cerasommatidia plaumanni is most similar to C. arroaei in overall appearance and by sharing the anterior bordering of the pronotum almost completely absent or becoming feebler medially. However, it can be distinguished by having the posterior margin of the pronotum distinctly bordered ( Fig. 5C ) and the aedeagus sinuate with a much shorter tegmen ( Fig. 3E ) than in C. arroaei ( Fig. 3F ).

Description: Body: length 1.15 mm, 1.25 times as long as wide, 1.8 times as long as high, short oval and moderately convex, black with dark-brown legs, antennae and palpi.

Antenna nearly 0.35 of length of body ( Fig. 3B ); antennomeres 1–5 longer than wide; antennomeres 6, 7, 9 subquadrate and antennomere 8 slightly transverse ( Fig. 5E ). Apical labial palpomere short and briefly truncate, 1.2 as long as wide ( Fig. 5B ).

Pronotum 2.5 times as wide as long, 1.9 times wider at widest part than on front angles ( Fig. 5C ). Anterior margin with fine bordering line vanishing medially; lateral margins narrowly, gently bordered. Base bordered with feeble carina. Prosternal process ( Fig. 5D ), with apex about 0.75 of width of procoxal cavity, narrowest near half-length, weakly widened apically, with lateral carinae raised, almost reaching apical quarter of prosternum, with central part between carinae slightly depressed.

Elytra 0.85 mm long, about as long a wide, 3.3 times as long and 1.2 times as wide as pronotum ( Fig. 5G ); lateral margins visible from above at basal two-thirds ( Figs 3B , 5G ). Mesoventral process about 1.1 times as wide as mesocoxal diameter ( Fig. 3D ). Metaventrite with fine setiferous punctures ( Fig. 5H ).

Legs. Meso- and metatrochanters flattened, weakly angulately produced posteriorly ( Fig. 5H ).

Abdomen with male genital segment as in Fig. 3E .

Male genitalia. Aedeagus with penis long and comparatively narrow, sclerotized, sinuate, curved near base and at apical third, with apex not ramificate ( Fig. 3E ). Tegmen large, submembranous, long; tegminal strut large, flattened.

Female unknown.

Distribution: Brazil ( Fig. 20B ).

Figures

Figure 3. Morphology of Cerasommatidia spp. A, Cerasommatidia arroaei holotype, dorsal habitus of dismembered specimen. B, Cerasommatidia plaumanni paratype, dorsal habitus. C–E, Cerasommatidia plaumanni: C, head, dorsal. D, meso- and metaventral structures. E, abdomen with male terminalia and genitalia partially visible through the abdominal ventrites. F, Cerasommatidia arroaei male genitalia. Scale bars: 1 mm.

Figure 5. Morphology of Cerasommatidia plaumanni. A, head, dorsal. B, head, ventral. C, pronotum (arrow: posterior margin of pronotum). D, prosternum. E, antenna. F, mesotarsus. G, left elytron, dorsal. H, meso- and metaventrite, and first abdominal ventrite (arrow: postcoxal line).

Figure 20. Geographical distribution of Cerasommatidiidae spp. A, distribution of species in eastern Caribbean region. B, distribution of species in southeastern Brazil. C, distribution of species in Madagascar.