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Figure 13 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 13. Karyotypes of the Cylominae, without treatment. A, D, Exydrus gibbosus, mitosis, midgut. B–C, E, Tormissus magnulus, mitosis, midgut. F–H, Rygmodus modestus (F–G, meiotic metaphase I, testes; H, mitotic karyotype, midgut). Habitus figures: (I) Exydrus gibbosus; (J) Rygmodus modestus, from Minoshima et al. (2018).

Figure 14 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 14. Karyotypes of the Omicrini and Sphaeridiini, without treatment. A–F, Omicrini: (A–B) Noteropagus sp. from Taiwan, meiotic karyotypes from testes; (C–D) Omicrogiton insularis, mitotic karyotype, midgut; (E–F) Paromicrus sp. from Taiwan, mitotic karyotype, midgut. G–I, habitus of examined specimens: (G) Noteropagus sp.; (H) Omicrogiton insularis; (I) Paromicrus sp. J–P, Sphaeridiini: Sphaeridium; (J–K) Sphaeridium lunatum (J, testes, mitosis; K, midgut, mitosis); (L) Sphaeridium scarabaeoides, mitosis, midgut; (M) Sphaeridium bipustulatum, mitosis, midgut; (N–P) meiosis, metaphase I, testes: (N) Sphaeridium scarabaeoides; (O) Sphaeridium bipustulatum; (P) Sphaeridium lunatum. Q, habitus of Sphaeridium scarabaeoides.

Figure 12 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 12. Karyotypes of the Cylominae, without treatment. A–B, Adolopus sp., mitosis from midgut. D, Cyloma guttulatus, mitosis from midgut. E–G, Cyloma sp. (E–F, meiotic first metaphase; G, testes, mitosis;). I–M, Cylomissus glabratus: (I–J) mitotic metaphase from midgut; (K–M) meiotic metaphase I from testes. Habitus figures: (C) Adolopus sp.; (H) Cyloma sp., specimen collected with karyotyped voucher; (N) Cylomissus glabratus, from Minoshima et al. (2015).

Figure 11 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 11. Karyotypes of the Acidocerinae. A–C, Agraphydrus, mitotic metaphase, midgut: (A–B) Agraphydrus decipiens; (C) Agraphydrus variabilis. D–L, Helochares: (D–E) Helochares lividus, mitosis, midgut; (F) Helochares obscurus, mitosis, midgut; (G–H) Helochares punctatus, mitosis, midgut; (I) Helochares punctatus, karyotype of male embryo with multiple y-chromosomes; (J–K) meiotic metaphase I from testes (J, Helochares punctatus; K, Helochares lividus); (L) Helochares sauteri, mitosis, midgut. A, D, F, G, I–L, without treatment. B, C, E, H, C-banded. Habitus figures: (M) Agraphydrus decipiens, from Minoshima, Komarek, & Ȏhara 2015; (N) Helochares obscurus.

Figure 10 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 10. Karyotypes of Enochrus (Lumetus). A–C, Enochrus quadripunctatus, mitosis, midgut. D–K, Enochrus fuscipennis, mitosis, midgut (H–I, specimens from Denmark, Rømø Island with the karyotypes indicating their hybrid origin). L–N, meiotic metaphase I from testes (L, Enochrus quadripunctatus, UK: East Walton, Norfolk; M–N, Enochrus fuscipennis, Denmark: Rømø Island). O–P, Enochrus fuscipennis, testes, mitotic metaphase from the same specimens as in (H–I). A, B, D, E, H, I, J, M–P, without treatment. C, F, G, K, L, C-banded.

Figure 9 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 9. Karyotypes of Enochrus (Lumetus), mitosis from embryos. A, Enochrus bicolor. B–C, Enochrus ochropterus. D–E, Enochrus testaceus. F–K, Enochrus halophilus. A, B, D, F, H, I, without treatment. C, E, G, K, C-banded. Habitus figures: (L) Enochrus (Lumetus) testaceus; (M) Enochrus (Lumetus) halophilus.

Figure 8 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 8. Mitotic karyotypes of the Enochrinae. A, Cymbiodyta marginella, embryo. B–D, European usual-looking species of Enochrus (Methydrus) from embryos: (B) Enochrus affinis; (C) Enochrus coarctatus; (D–E) Enochrus nigritus. F–G, unusual species assigned at the moment to Enochrus (Methydrus): (F) Enochrus morenae, midgut; (G) Enochrus sauteri, midgut. H, Enochrus (s.s.) melanocephalus, embryo. A–G, without treatment. H, C-banded. Habitus figures: (I) Cymbiodyta marginella; (J) Enochrus morenae.

Figures 60–67 in Larval chaetotaxy and morphology are highly homoplastic yet phylogenetically informative in Hydrobiusini water scavenger beetles (Coleoptera: Hydrophilidae)

Figures 60–67. Larva of Limnohydrobius melaenus, first instar (60–63) and third instar (64–67). 60, 64, antenna, dorsal view. 61, 65, right mandible, dorsal view. 62, 66, maxilla, dorsal view. 63, 67, maxilla, ventral view. Scale bars: 0.05 mm.

Figures 90–98 in Larval chaetotaxy and morphology are highly homoplastic yet phylogenetically informative in Hydrobiusini water scavenger beetles (Coleoptera: Hydrophilidae)

Figures 90–98. Third instar larva of Sperchopsis tessellata. 90–92, head capsule (90, dorsal view; 91, ventral view; 92, labroclypeus). 93, antenna, dorsal view. 94, right mandible, dorsal view. 95–96, maxilla (95, dorsal view; 96, ventral view). 97–98, mentum and prementum (97, dorsal view; 98, ventral view). Scale bars: Figs 90–91: 0.1 mm, Figs 92–98: 0.05 mm.

Figures 86–89 in Larval chaetotaxy and morphology are highly homoplastic yet phylogenetically informative in Hydrobiusini water scavenger beetles (Coleoptera: Hydrophilidae)

Figures 86–89. Larva of Limnoxenus niger, first instar (86–87) and third instar (88–89). 86, 88, mentum and prementum, dorsal view. 87, 89, mentum and prementum, ventral view. Scale bars: 0.05 mm.

Figures 78–85 in Larval chaetotaxy and morphology are highly homoplastic yet phylogenetically informative in Hydrobiusini water scavenger beetles (Coleoptera: Hydrophilidae)

Figures 78–85. Larva of Limnoxenus niger, first instar (78–81) and third instar (82–85). 78, 82, antenna, dorsal view. 79, 83, right mandible, dorsal view. 80, 84, maxilla, dorsal view. 81, 85, maxilla, ventral view. Scale bars: 0.05 mm.

Figure 17 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 17. Mitotic karyotypes of Cercyon from midgut. (A) Cercyon marinus; (B–E) Cercyon lateralis; (F–G) Cercyon obsoletus; (H) Cercyon impressus; (I–K) Cercyon haemorrhoidalis; (L–N) Cercyon melanocephalus. A, B, D, F, H, I, K, L, N, without treatment. C, E, G, J, M, C-banded. Habitus figures: (O) Cercyon marinus; (P) Cercyon impressus; (Q) Cercyon haemorrhoidalis, from Fikáček (2019).

Figure 15 in Karyotypes of water scavenger beetles (Coleoptera: Hydrophilidae): new data and review of published records

Figure 15. Karyotypes of the Coelostomatini and Protosternini. A–C, Coelostoma orbiculare, embryo (A, with B-chromosomes; B–C, without B-chromosomes). D–F, Dactylosternum flavicorne, embryo. G, Dactylosternum corbetti, mitosis, midgut. J–K, Protosternum abnormale, meiotic nuclei from testes. A–F, J, K, without treatment. G, C-banded. Habitus figures: (H) Coelostoma orbiculare; (I) Dactylosternum corbetti; (L) Protosternum abnormale, from Fikáček et al. (2018).

Figures 99–106 in Larval chaetotaxy and morphology are highly homoplastic yet phylogenetically informative in Hydrobiusini water scavenger beetles (Coleoptera: Hydrophilidae)

Figures 99–106. Results of the phylogenetic analyses. 99–105, topologies obtained using different datasets: 99, larval morphology only (majority rule consensus); 100: larval chaetotaxy only (implied weighted tree, k = 20). 101, all larval characters (implied weigthed tree, k = 20). 102, larval and adult characters (most parsimonous tree). 103, reference topology based on DNA data, adopted from Toussaint & Short (2018). 104, part of the tree based on all larval characters (same as on Fig. 101) with characters mapped. 105, Hydrophilinae molecular reference topology with updated position of Tritonus with larval characters mapped. 106, alternative position of Tritonus in constrained topology search using different datasets.

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Fig. 2 in Biology, Distribution, and Phylogenetic Placement of the California Endemic Water Scavenger Beetle Hydrochara rickseckeri (Horn) (Coleoptera: Hydrophilidae)

Fig. 2. Known distribution of Hydrochara rickseckeri. Two vague localities ("Oakland" and "Santa Rosa") are not independently mapped as there are other, more specific localities given for both these areas.

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Fig. 3 in Biology, Distribution, and Phylogenetic Placement of the California Endemic Water Scavenger Beetle Hydrochara rickseckeri (Horn) (Coleoptera: Hydrophilidae)

Fig. 3. Molecular phylogeny of the tribe Hydrophilini with an emphasis on the genus Hydrochara as inferred in IQ-TREE based on a multimarker dataset. Branches within each genus of Hydrophilini are color-coded with a different color for each genus; those in black represent outgroups. Nodal support is given across the topology as recovered in the ultrafast bootstrap (UFBS) analysis performed in IQ-TREE. Values of UFBS ±95 are considered as robust. A picture of Hydrochara caraboides (Linnaeus) is presented on the left of the phylogeny (Photograph by Jan Hamrsky, lifeinfreshwater.net/).

FIGURES 37–40 in Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera Hydrophilidae) from Mexico with description of two new species

FIGURES 37–40. Comparison of morphology between H. (D.) violaceonitens and H. (D.) smaragdinus Brullé (from Brazil); 37–38 H. (D.) violaceonitens status restored; 37 ventro-lateral view of pro- and mesothorax (arrow: apically truncate prosternal lobes); 38 ventral view abdomen and hind tibia (arrow: tibial apex without patch of setae); 39–40 H. (D.) smardagdinus Brullé (from Brazil); 39 ventro-lateral view of pro- and mesothorax (arrow: acute apex of prosternal lobes); 40 ventral view abdomen and hind tibia (arrow: patch of setae in tibial apex).

FIGURES 19–24 in Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera Hydrophilidae) from Mexico with description of two new species

FIGURES 19–24. Dorsal and ventral view of Hydrophilus (Dibolocelus) spp. 19–20 H. (D.) violaceonitens status restored; 21–22 H. (D.) pollens Sharp; 23–24 H. (D.) cf. purpurascens (Régimbart).

FIGURES 7–18 in Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera Hydrophilidae) from Mexico with description of two new species

FIGURES 7–18. Morphological structures and male genitalia of Hydrophilus (Dibolocelus) spp. 7-10 H. (D.) ovatus Gemminger & Harold; 7 ventral view of head (arrow: third labial palpomere); 8 protibia and tarsi, 9 ventral view of abdomen; 10a aedeagus ventral; 10b aedeagus dorsal; 11–14 H. (D.) pseudovatus sp. nov.; 11 ventral view of head(arrow: third labial palpomere); 12 protibia and tarsi, 13 ventral view of abdomen; 14a aedeagus ventral; 14b aedeagus dorsal; 15–18 H. (D.) nucleoensis sp. nov.; 15 ventral view of head (arrow: third labial palpomere); 16 protibia and tarsi, 17 ventral view of abdomen; 18a aedeagus ventral; 18b aedeagus dorsal.

FIGURES 44–49 in Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera Hydrophilidae) from Mexico with description of two new species

FIGURES 44–49. Type material and labels of Hydrophilus (Dibolocelus) from Mexico. 44 Specimen labels of Hydrophilus (Dibolocelus) pollens Sharp male lectotype (designated in this work); 45 Labels of female paralectotype; 46–48 Habitus of Hydrophilus (Dibolocelus) violaceonitens du Val; 46 dorsal; 47 ventral; 48 lateral; 49 Specimen labels of Hydrophilus (Dibolocelus) violaceonitens du Val holotype. Copyright of images 46–49 belongs to MNHN/Christophe Rivier.