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Fig. 1 in Morphology of the pronotal compound glands in Tritoma bipustulata (Coleoptera: Erotylidae)

Fig. 1 SEM pictures of compound glands of two Erotylinae species. a–g Pronotal glands of Tritoma bipustulata after treatment with KOH. a Ventral view of inside of right half of pronotum, anterior corner of pronotum to the right. b Position of gland opening corresponds with position of externally visible pore (arrow). c Overall view of a branched gland (arrow). d, e Piece of main excretory duct (ed) of gland bearing glandular ductules (gd) and smaller lateral appendices (la) originating from base of glandular ductules (unlabeled arrows). f Base of a glandular ductule (gd), with constriction (gdc) and origin of lateral appendix (la); the cuticular filaments of lateral appendix embrace the base (unlabeled arrow). g Pieces of two glandular ductules (gd), showing their spongiose surface. h Prosternal gland of T. bipustulata. i Overall view of pronotal gland of Triplax scutellaris. Scale bars in µm

Fig. 4 in Morphology of the pronotal compound glands in Tritoma bipustulata (Coleoptera: Erotylidae)

Fig. 4 SEM pictures showing tubules of dermal glands of four different types found in Tritoma bipustulata (after treatment with KOH). a Tubule with smooth dilatation followed distally by a narrow part. b Tubule with smooth dilatation and without a narrow part

Fig. 4 in Toward a Natural Classification of Tritomini: Are There Hidden Tribes within the Genus Tritoma Fabricius (Coleoptera: Erotylidae)?

Fig. 4. Rotitma sanguinipennis, specimens from Oklahoma: Latimer Co. (USA). A) Metendosternite. Male and female terminalia: B) Male genitalia, C) Male tegmen, arrow points to projection of basal piece, D) Male genital capsule, E) Female genitalia, spe = spermatheca, spd = spermathecal duct, F) Female abdominal segment VIII. Scale bar for A, C–D, E–F (same bar) = 0.2 mm, B = 0.5 mm.

Fig. 3 in Toward a Natural Classification of Tritomini: Are There Hidden Tribes within the Genus Tritoma Fabricius (Coleoptera: Erotylidae)?

Fig. 3. Rotitma sanguinipennis, male specimen from Oklahoma: Latimer Co. (USA). A–C) Habitus, D) Head showing clypeal margin, E) Ventral head and prosternum, E') Postmandibular lobe of a male from Arkansas, arrow points to mandibular condyle, F) Maxilla, galea and lacinia, G) Mandible. Scale bar for A–C = 1 mm, D–E = 0.5 mm, E', F–G = 0.1 mm.

Fig. 2 in Toward a Natural Classification of Tritomini: Are There Hidden Tribes within the Genus Tritoma Fabricius (Coleoptera: Erotylidae)?

Fig. 2. Aporotritoma pulchra, specimens from Oklahoma: Latimer Co. (USA). A) Ventral head and prosternum showing triangular plate, arrow points to postmandibular lobe, B) Metendosternite. Male and female terminalia: C) Male genitalia, fla = penile flagellum, D–E) Male flagellar head, F) Male tegmen, arrow points to narrowed projection of basal piece, G) Male genital capsule, arrow indicates spiculum gastrale, H) Female genitalia, spe = spermatheca, spd = spermathecal duct. Scale bar for A–B, F–G = 0.2 mm, C = 0.5 mm, D–E = 0.1 mm, H = 0.25 mm.

Fig. 1 in Toward a Natural Classification of Tritomini: Are There Hidden Tribes within the Genus Tritoma Fabricius (Coleoptera: Erotylidae)?

Fig. 1. Aporotritoma pulchra, male specimen from Oklahoma: Latimer Co. (USA). A–C) Habitus, D) Head showing clypeal margin. Mouthparts: E) Maxilla, arrow showing lacinial hook, F) Magnified galea and lacinia, arrow points to apical hooks on lacinia, G) Labium, H) Mandible, arrow points to angulate outer edge. Scale bar for A–C = 1 mm, D–E, H = 0.2 mm, F–G = 0.1 mm.

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Fig. 3 in Tritoma subbasalis(Reitter) (Coleoptera: Erotylidae) in Poland

Fig. 3. Habitat of Tritoma subbasalis in Seven Islands Lake Reserve near Węgorzewo, Poland (Photograph by D. Doktór).

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Fig. 2 in Morphology of the pronotal compound glands in Tritoma bipustulata (Coleoptera: Erotylidae)

Fig. 2 TEM serial sections of pronotal gland of Tritoma bipustulata. a Overall view of sectioned gland, cut nearly perpendicular to axis of excretory duct (ed, filled), which is surrounded by several gland units (glandular ductules, gd, and lateral appendices, la). b Proximal part of glandular ductule with opening into excretory duct, sectioned approximately along axis of ductule and along axis of lateral appendix; the extracellular filamentous structure (fs) forming the core of the lateral appendix is enclosed by a narrow cell (lacl; delimiting membrane indicated by white arrowheads), which contains numerous vesicles; further distally (left upper part) a second cell (gdcl; delimiting membrane indicated by black arrowheads) encloses the conducting canal of the glandular ductule. The conducting canal has a

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Fig. 5 in Morphology of the pronotal compound glands in Tritoma bipustulata (Coleoptera: Erotylidae)

Fig. 5 Schematic drawing of a gland unit of the pronotal compound gland of T. bipustulata. a One gland unit upon excretory duct, with sectional planes shown in b, c, and d. b Longi- tudinal section through gland unit (compare Figs. 2b, d, 3d). c Cross-section through proximal region of gland unit; lateral appendix directed towards bottom (compare Figs. 2c, 3b, f). d Cross-section through distal region of gland unit (compare Figs. 2c, 3a). In b, c, and d, cuticle in dark gray (darker outer layer) or medium gray (brighter inner layer); cytoplasm in light gray; contin- uous black lines are membranes (of cells or cellular organelles)

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Fig. 3 in Morphology of the pronotal compound glands in Tritoma bipustulata (Coleoptera: Erotylidae)

Fig. 3 TEM serial sections of a gland unit of the pronotal gland of Tritoma bipustulata. a Detail of glandular ductule in region of receiving canal, cut perpendicular to axis of glandular ductule; canal surrounded by a narrow dense and a wide spongiose layer (ss) of the cuticle, and the secretory cell (gdcl); extracellular cavity (ec) in upper part. b Detail of glandular ductule in region of lateral appendix, cut perpendicular to axis of glandular ductule; extracellular filamentous structure (fs) enclosed by a narrow vesicle-containing cell (lacl). c Glandular ductule cut perpendicular to its axis in region of receiving canal, with dense and spongiose (ss) layers of cuticle, extracellular cavity, and secretory cell (gdcl); endoplasmatic reticulum (er) and numerous vesicles (v) inside cell gdcl. d Glandular ductule cut nearly longitudinally in region of receiving canal; with pores (white arrowheads) in the dense and the spongiose (ss) cuticular layers of canal wall, and strands of secretion (black arrows) in extracellular cavity. e Vesicles, rough endoplasmatic reticulum, and mitochondria in a secretory cell. f Partly strongly folded membrane (white arrowheads) of cell (lacl) enclosing the filamentous structure fs. Scale bars inµm