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Figs 20-27 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 20-27: Male genitalia of: (20, 24) Rhithrodytes minimus nov.sp.; (21, 25) R. dorsoplagiatus; (22, 26) R. numidicus; (23, 27) R. sexguttatus: Median lobe in ventral and lateral view and perpendicular view onto tip (20-23), left paramere (24-27).

Figs 28-35 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 28-35: Male genitalia of: (28, 32) Rhithrodytes agnus; (29, 33) R. argaensis; (30, 34) R. crux; (31, 35) R. bimaculatus: Median lobe in ventral and lateral view and perpendicular view onto tip (28-31), left paramere (32-35).

Figs 12-19 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 12-19: Habitus of: (12) Rhithrodytes minimus nov.sp.; (13) R. dorsoplagiatus; (14) R. numidicus; (15) R. argaensis; (16) R. agnus; (17) R. sexguttatus; (18) R. crux; (19) R. bimaculatus (scale bar 2.5 mm).

Figs 8-9 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 8-9: Female syntype of Hydroporus sexguttatus AUBÉ, 1838: (8) habitus; (9) labels (scale bar 2 mm).

Figs 4-5 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 4-5: Ventral surface of Rhithrodytes minimus nov.sp.: (4) head; (5) part of metathorax and abdomen (significance of arrows explained in text).

Fig. 5 in A new, putatively semisubterranean, Rhithrodytes diving beetle from southwestern Sardinia (Coleoptera: Dytiscidae)

Fig. 5. Type locality of R. pantaleonii sp. nov., Italy, Sardinia, Carbonia-Iglesias province, Riu Siuru 4 km NW Domusnovas, 39°21.55′N 08°37.14′E, 260 m a.s.l. A – Overview of stream with (left to right) Mario Toledo, Antonio Schizzerotto & David Bilton; B – Detail of microhabitat, Rhithrodytes collected from edges of right-hand bank. Photos Michael Balke.

Fig. 4 in A new, putatively semisubterranean, Rhithrodytes diving beetle from southwestern Sardinia (Coleoptera: Dytiscidae)

Fig. 4. Sardinian Rhithrodytes species, details of head and compound eyes. A – R. pantaleonii sp. nov., holotype; B – R. sexguttatus (Aubé, 1838). Scale bar = 100 μm.

Fig. 2. Sardinian Rhithrodytes species. A – R in A new, putatively semisubterranean, Rhithrodytes diving beetle from southwestern Sardinia (Coleoptera: Dytiscidae)

Fig. 2. Sardinian Rhithrodytes species. A – R. pantaleonii sp. nov., paratype, dorsal habitus; B – R. sexguttatus (Aubé, 1838), dorsal habitus; C – R. pantaleonii sp. nov., holotype, male genitalia; D – R. sexguttatus (Aubé, 1838), male genitalia. In C & D, images represent, from left to right: median lobe, lateral view; median lobe, ventral view; median lobe apex; paramere. Scale bars A & B = 1 mm; C & D = 100 μm.

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Figs 1-2 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 1-2: Holotype of Rhithrodytes minimus nov.sp.: (1) habitus; (2) labels (scale bar 2 mm).

Figs 10-11 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 10-11: "Type" of Graptodytes sexguttatus ab. octoguttatus ZIMMERMANN, 1919: (10) habitus; (11) labels (scale bar 2 mm).

Figs 6-7 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Figs 6-7: Part of ventral surface showing epipleural carina of: (6) Rhithrodytes bimaculatus; (7) Hygrotus impressopunctatus (reproductions from FERY 2013).

Fig. 3 in Notes on Rhithrodytes BAMEUL, 1989, with the description of R. minimus nov.sp. from Algeria (Coleoptera, Dytiscidae. Hydroporini, Siettitiina)

Fig. 3: Part of drawer No. 11 of the coll. E. Wehncke (in coll. R. Oberthür, MNHN) in which the holotype of Rhithrodytes minimus nov.sp. was found.

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Alignment: A new, putatively semisubterranean, Rhithrodytes diving beetle from Southwestern Sardinia (Coleoptera: Dytiscidae: Hydroporini)

<p>Alignment for the molecular analyses made in the publication A new, putatively semisubterranean, <em>Rhithrodytes </em>diving beetle from Southwestern Sardinia (Coleoptera: Dytiscidae: Hydroporini).</p>

Fig. 3. Sardinian Rhithrodytes species, lateral view. A – R in A new, putatively semisubterranean, Rhithrodytes diving beetle from southwestern Sardinia (Coleoptera: Dytiscidae)

Fig. 3. Sardinian Rhithrodytes species, lateral view. A – R. pantaleonii sp. nov., holotype; B – R. sexguttatus (Aubé, 1838). Scale bar = 1 mm.

Fig. 1 in A new, putatively semisubterranean, Rhithrodytes diving beetle from southwestern Sardinia (Coleoptera: Dytiscidae)

Fig. 1. Molecular phylogeny of Rhithrodytes and related genera of Hydroporini obtained with BEAST. Values beside nodes represent posterior probabilities, and 95% credibility intervals for estimated ages are shown with grey bars. Inset at top left shows the approximate distribution of land in the Mediterranean Basin in the Oligocene/Early Miocene (modified after ANDREUCCI et al. 2017); black arrow – Corsico-Sardinia, red arrow – Sardinian Seaway. Beetles at right hand side as follows, top to bottom: Stictonectes rebeccae Bilton, 2013, Rhithrodytes pantaleonii sp. nov., Rhithrodytes sexguttatus (Aubé, 1838).