Ctenopeuca romani Bernhauer, 1928

Barroso, Flavia B., Eldredge, K. Taro & Caron, Edilson, 2024, Review of Ctenopeuca Bernhauer, a spiny, pipevine flower-associated rove beetle from South America (Coleoptera, Staphylinidae, Aleocharinae, Oxypodini), Zootaxa 5497 (2), pp. 255-266 : 261-264

Ctenopeuca romani Bernhauer, 1928

( Figs. 4–20 , 28–33 )

Type material. Lectotype here designated ( Figs. 4–6 ). Labels : 1) “ Bahia /Iguassú/Roman” [white label, printed in black]; 2) “ Sv. Amaz. /Exp. Roman” [white label, printed in black]; 3) “Chicago NHMus/ M.Bernhauer /Collection” [white label, printed in black]; 4) “10 juli” [white label, numbers manuscript and letters printed in black]; 5) “ Ctenopeuca /Romani./Bernh. Cotypus” [white old label, manuscript]; 6) [male simbol, white label, manuscript]; 7) “Lectotype/ Ctenopeuca /romani [male simbol]/des. K. T.Eldredge 2013” [red label, the first and last line (except 2013) printed in black, the rest manuscript]; 8) “ FMNH ” [white label, printed in black]; 9) “QR Code/FMNHINS/3982449/ FIELD MUSEUM /Pinned” [white label, printed in black]; 10) “PHOTOGRAPHED/ S. Ware 2021” [white label, prinited in black]. Note: Bernahuer (1928) did not specify how many specimens were studied.

Paralectotype ( FMNH), female .

Additional material. 105 specimens deposited in CESP from Brazil, Bahia, Rio das Contas, Umbuzeiro, Chapada Diamantina, S13°31’38.5” W41°43’57.9”, 21/xi/2010, collected in Aristolochia gigantea Mart. & Zucc., J.Hipolito, I. Manimann & I. Abreu , col .

Diagnosis. Ctenopeuca romani differs from C. heynei by having head darker than pronotum and abdominal segments III–IV conspicuously lighter than V–VII ( Fig. 5 ); antennomere 4 wider than long ( Fig. 7 ); posterior margin of abdominal tergum VIII of male without a prominent tooth on each side of serrate region ( Fig. 28 ); posterior margin of abdominal tergum VIII of female without tooth on each side of emarginate region ( Fig. 32 ).

Redescription. Male. Body length, mean 5.57 mm, standard deviation 0.86 mm. Humeral width 1.0 mm. Head, antennomeres 4–11, posterolateral angle region of elytra and abdominal segments V–VII brown to dark brown, the rest of body yellowish to light brown ( Fig. 2 ). Antennomere 4 wider than long ( Fig. 7 ). Abdominal spine of tergum IV triangular in lateral view ( Fig. 16 , ST4); spine of sternum III slightly longer than the spine of sternum IV ( Fig. 16 , SS3 and SS4); tergum VIII with posterior margin emarginate and serrate ( Fig. 28 ); sternum VIII with posterior margin projected medially ( Fig. 29 ); median lobe of aedeagus curved paramerally in lateral view, apical half with ventral face straight at basal two-third and curved at the apical third ( Fig. 30 ). Female. Similar to male, except tergum VIII with posterior margin not serrate ( Fig. 32 ); sternum VIII with posterior margin curved ( Fig. 33 ); spermatheca L-shaped, capsule globose and without coiled duct ( Fig. 31 ).

Distribution. Brazil: Bahia (Iguaçú) ( Fig. 34 )

Biological notes. Ctenopeuca romani is associated to the flower of Aristolochia L. ( Aristolochiaceae ) ( Bernhauer 1928) and in 2015 all specimens were collected in A. gigantea Mart. & Zucc. The host is an endemic liana that occurs in the East and South of Brazil, such as Bahia, Minas Gerais, Espirito Santo, Rio de Janeiro, São Paulo and Paraná ( Reflora 2023).

Figures

FIGURE 34. Map of Ctenopeuca distribution. The green spot indicates C. heynei (not exact record), the pink spot indicates C. romani (not exact record), and the red spot indicates C. romani (exact record).

FIGURES 1–6. Habitus of Ctenopeuca. 1–3) Lectotype of C. heynei Bernhauer (FMNH): 1) lateral view (ST3 indicates spine of tergum III, SS3 indicates spine of sternum III, ST4 indicates spine of tergum IV, SS4 indicates spine of sternum IV, ST7 indicates spine of tergum VII), 2) dorsal view, 3) ventral view. 1–3) Lectotype of C. romani Bernhauer (FMNH): 4) lateral view, 5) dorsal view, 6) ventral view. Scale bars 3.0 mm.

FIGURES 7–16. Ctenopeuca romani: 7) Antenna; 8) Labrum, dorsal view; 9) Detail of labrum, dorsal view (bold arrow indicates a-sensilla, thin arrow indicates b-sensilla); 10) Right mandible, dorsal view; 11) Left mandible, dorsal view; 12) Maxilla, dorsal view; 13) Labium, ventral view; 14) Head, ventral view (arrow indicates infraocular carina); 15) Meso- and metaventrite, ventral view; 16) Abdomen, dorsal view (ST3 indicates spine of tergum III, SS3 indicates spine of sternum III, ST4 indicates spine of tergum IV, SS4 indicates spine of sternum IV, ST7 indicates spine of tergum VII).

FIGURES 17–20. Ctenopeuca romani: 17) Median lobe, lateral view; 18) Median lobe, ventro-lateral view; 19) Apex of median lobe, lateral view; 20) Paramere, lateral view.

FIGURES 28–33. Ctenopeuca romani: 28) Tergum VIII, male, dorsal view; 29) Sternum VIII, male, dorsal view; 30) Median lobe, lateral view; 31) Spermatheca; 32) Tergum VIII, female, dorsal view; 33) Sternum VIII, female, dorsal view. Scale bars 0.6mm.