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Fig. 10 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 10. Habitus photographs of the species of the Eupotemus limicola species group, holotypes (A–F) and differences between species groups in pronotal morphology (G–H). A–C – E. smithi sp. nov.; D–F – E. ophioglossus sp. nov.; G–I – pronotal sculpture: G – E. carinaticollis species group; H – E. limicola species group.

Fig. 7 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 7. Biology of Epimetopidae. A–D – Eumetopus acutimontis Ji & Jäch, 1998 in Vietnam, Khánh Hòa Prov., Ba Ho Waterfalls National Park, 12°23.131′N 109°08.052′E: A–B – alive specimens on wet sandy shores; C – specimen buried in wet sand; D – general view of the locality. E–F – locality of Epimetopus surinamensis Perkins, 2012 in Suriname: Sipaliwini, Wehepai, 2°21.776′N 56°41.861′W (SR10-0904-01A) (E – general view; F – detail of sandy banks from which specimens were collected). G–H – locality of Epimetopus simplex Perkins, 1979 in Venezuela, Guarico, Rio San Antonio, 9°46.32′N 67°21.177′W (VZ09-0108-02A) (G – detail of gravelly shore show which specimens were collected; H – general view). I–J – marshy roadside ditch with Epimetopus venezuelensis Perkins, 2012 in Venezuela, Apure, ca. 1 km N Rio Claro, 7°10.162′N 67°38.69′W (AS-06-009). (I – general view; J – detail of the microhabitat). Photos by A. Sazhnev (A–C), A. Prokin (D), A. Short (E–J).

Fig. 16 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 16. Photographs of Epimetopus species, including two specimens of questionable provenance (E–G). A – E. flavicaptus Fikáček, Barclay & Perkins, 2011; B – E. deceptus Perkins, 2012; C – E. tridens Perkins, 2012; D – E. hintoni Balfour-Browne, 1949; E – Epimetopus sp. (ʻZambiaʼ); F–G – E. cf. burruyacu Oliva, 1986 (ʻSaudi Arabiaʼ) (F – dorsal view; G – aedeagus). Scale bars for A–F = 0.5 mm. A–D adopted from Pൾ*©κංඇඌ (2012).

Fig. 13 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 13. Known distribution of Eupotemus species. A – species of E. limicola species group; B – species of E. carinaticollis species group.

Fig. 6 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 6. Male genitalia and associated structures of Epimetopidae. A–H – Eupotemus Ji & Jäch, 1998 (A–F – E. smithi sp. nov.; G – E. cameroonensis sp. nov.; H – E. carinaticollis (Basilewsky, 1956)). I–R – Epimetopus Lacordaire, 1854 (I–N – E. mendeli Fikáček et al., 2011; O – E. cf. burruyacu Oliva, 1986; P – E. multiporus Perkins, 2012; Q – E. clandestinus Perkins, 2012; R – E. thermarum Schwarz & Barber, 1917). S–Z – Eumetopus Balfour-Browne, 1949 (S–Y – E. acutimontis Ji & Jäch, 1998; Z – E. bullatus (Sharp, 1875)). A, I, S – sternite VIII; B, J, T – tergite VIII; C, K, U – sternite IX; D, L, V – aedeagus dorsally; E, M, W – aedeagus laterally; F, N, X – aedeagus ventrally (basal part omitted in X); Y – sperm pump. Color coding: green – ventral projections of the median lobe; red – median lobe; blue – paramere (pale blue – dorsal lobe; dark blue – ventral lobe). Not to scale.

Fig. 5 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 5. Morphology of Epimetopidae. A–B – ventral morphology: A – Eupotemus smithi sp. nov.; B – Epimetopus mendeli Fikáček, Perkins & Barclay, 2011. C–F – hind wings: C – Eumetopus schulkei Jäch, 2002; D – Eupotemus smithi sp. nov.; E – Epimetopus mendeli, adopted from Fංκගඹൾκ et al. (2011); F – Epimetopus costaricensis Perkins, 1979. G – dorsal part of the metathorax. H – scutellum. I–K – abdominal ventrites (I – Eumetopus schuelkei; J – Eupotemus smithi sp. nov.; K – Epimetopus mendeli). L–M – ovipositor (L – Eumetopus schuelkei; M – Eupotemus smithi). O – elytral punctation, slide-mounted elytra of Epimetopus costaricensis. P – female of Eumetopus acutimontis in ventral view, with the egg cases carried under the abdomen. Not to scale.

Fig. 15 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 15. Elytral sculpture and male genitalia of Eumetopus Balfour-Browne, 1949. A–H – elytral sculpture, same specimens as in Fig. 14: A – E. acutimontis Ji & Jäch, 1998; B – E. asperatus (Champion, 1919); C – E. bullatus (Sharp, 1875); D – E. flavidulus (Sharp, 1890); E – E. maindroni (Régimbart, 1903); F – E. schuelkei Jäch, 2002; G – E. tibialis Ji & Jäch, 1998; H – E. weigeli Skale & Jäch, 2003. I–L – male genitalia of examined specimens, large basal portion of the phallobase omitted (dorsal and lateral view): I – E. acutimontis from Vietnam; J – E. flavidulus from India: Andhra Pradesh; K – E. maindroni from India: Gujarat; L – E. weigeli from India: Uttarakhand.

Fig. 3 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 3. Thoracic morphology of the genera of Epimetopidae. A–B, J, Q – Eupotemus smithi sp. nov.; C–D, L–O – Eumetopus schuelkei Jäch, 2002; E–F – Epimetopus mendeli Fikáček, Barclay & Perkins, 2012; G–I, P – Epimetopus costaricensis Perkins, 1979. A–I – prothorax in ventral view (B, D, F, H – detail of ventral sculpture of the pronotal hood; I – detail of closed procoxal cavity. J–L – meso- and metathorax in ventral view. M–N – elytron in ventral view (M – general view; N – detail of the ventral ridge, notice the spiny surface on inner face of the ridge (in) and on the elytral plectrum posteriorly of it (pl)). O – mesotrochanter. P–Q – details of pretarsus with the leaf-like empodial seta. Not to scale.

Fig. 9 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 9. Habitus photographs of the species of the Eupotemus limicola species group, holotypes: A–C – E. bilobatus sp. nov.; D–F – E. cameroonensis sp. nov.; G–I – E. limicola (Delève, 1967).

Fig. 12 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 12. Habitus photographs of the species of the Eupotemus carinaticollis species group, holotypes: A–C – E. carinaticollis (Basilewsky, 1956); D–F – E. uluguru sp. nov.; G–I – E. taianus sp. nov.

Fig. 1 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 1. Distribution and phylogenetic relationships of Epimetopidae genera. A – summary of all known records of Epimetopidae, mapped by genera. Records for American Epimetopus adopted from Pൾ*©κංඇඌ (2012). B–E – phylogenetic relationship among genera based on morphological characters (B–C) and DNA data (D–E): B–C – strict consensus tree of the morphology-based maximum parsimony analysis (B – complete tree with bootstrap supports; C – Georissidae + Epimetopidae subtree with characters mapped). D – Bayesian maximum credibility tree based on cox1, 16S, 18S and 28S sequences, with posterior probability of particular clades. E – morphological characters mapped on the molecular topology of Epimetopidae constrained as sister to all other hydrophilid families following the topology by Lඳ et al. (2020).

Fig. 2 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 2. Morphology of mouthparts and head appendages of the genera of Epimetopidae. A–I – Eupotemus Ji & Jäch, 1998: A, C, E, F, H – E. smithi sp. nov., B, D, G – E. limicola (Delève, 1967), I – E. cameroonensis sp. nov. J–Q – Eumetopus Balfour-Browne, 1949: J, L, M, N, P – E. schuelkei Jäch, 2002, Q – E. bullatus (Sharp, 1875), K, L*, O – E. sp. from Sri Lanka. R–Z, a–l – Epimetopus Lacordaire, 1854: R–W – E. mendeli Fikáček et al., 2011, X–Z, a–c – E. costaricensis Perkins, 1979, g, j – E. thermarum Schwarz & Barber, 1917, e, k – E. trogoides (Sharp, 1874), h – E. costatus group, f, i, l – E. punctipennis Perkins, 1979. Body parts: A–B, J–K, R, X, g–i – labrum; C, L, S, Y – mandibles; D, L*, e–f – mandibular apex; E, M, T, Z – maxilla; U – detail of basal part of ultimate palpomere; F–G, N–O, V, a–b, j–l – mentum and prementum; H–I, P–Q, W, c – antenna. Not to scale.

Fig. 8 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 8. Male genitalia of the species of the Eupotemus limicola species group, holotypes. A–C, R–S – E. bilobatus sp. nov.; D–F, T–U – E. cameroonensis sp. nov.; G–I, V–W – E. ophioglossus sp. nov.; J–L, X–Y – E. smithi sp. nov.; M–Q – E. limicola (Delève, 1967). A, D, G, J, M – dorsal view; B, E, H, K, N – lateral view; C, F, I, L – ventral view; O – apex of the median lobe, dorsal view; P, R, T, V, X – fork of the median lobe; Q, S, U, W, Y – apex of parameres in lateral view.

Fig. 4 in The family Epimetopidae (Coleoptera: Hydrophiloidea): review of current knowledge, genus-level phylogeny, and taxonomic revision of Eupotemus

Fig. 4. Head and leg morphology of the genera of Epimetopidae. A–B, H, L – Eumetopus acutimontis Ji & Jäch, 1998; D, M – Eumetopus schuelkei Jäch, 2002; C, K–L, Q – Eupotemus smithi sp. nov.; F–G – Epimetopus punctipennis Perkins, 1979 (adopted from Pൾ*©κංඇඌ 2012); E, I–J, R – Epimetopus mendeli Fikáček, Barclay & Perkins, 2011; N–O – Epimetopus costaricensis Perkins, 1979. A – head in dorsolateral view (can – clypeal canthus causing the eye emargination); B–C – head in dorsal view (arrow – the ridge dividing anterior declined part of clypeus); D – mentum and maxilla; E – head in ventral view; F–G – occipital part of the head with median raised tubercle, dorsolateral view (arrows: parallel impressions corresponding to ventral ridges of pronotal hood); H–I – antenna, scapus largely omitted; J – labial palp; K – apical tibial armature, ventral view, mesothoracic leg; L – apical tibial armature and tarsus, ventral view, metathoracic leg; M – mesotibia; N–O – tarsus (N – posterior; O – anterior); P–R – metatibia, dorsal view. Not to scale.

Fig. 17. Meiosis metaphase I in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 17. Meiosis metaphase I from testes of Helophorus (Lihelophorus) species from Qinghai: Zuimatan. a – H. lamicola Zaitzev, 1908; b – H. ser Zaitzev, 1908; c – H. yangae sp. nov.

Fig. 16 in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 16. Mitotic chromosomes from mid-gut cells of males of Helophorus (Lihelophorus) species from Qinghai: Zuimatan, arranged as karyotypes. a–b – H. lamicola Zaitzev, 1908 (a – plain (Giemsa stained); b – same nucleus, C-banded). c–d – H. ser Zaitzev, 1908 (c – plain; d – same nucleus, C-banded). e–h – H. yangae sp. nov. (e – plain; f – same nucleus, C-banded; g – plain; h – same nucleus, C-banded). The y chromosome is missing from the preparation shown in c and d and in d the y chromosome from a different C-banded preparation with a similar degree of chromosomal condensation has been inserted.

Fig. 12 in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 12. Labroclypeus and epistome of larvae of Lihelophorus and Helophorus s.str. a–b – H. (H.) liguricus Angus, 1970 (a – dorsal view; b – ventral view); c–d – H. (Lihelophorus) yangae sp. nov. (c – dorsal; d – ventral); e–f – H. (Lihelophorus) lamicola Zaitzev, 1908 (e – dorsal; f – ventral).

Fig. 10 in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 10. Head capsule of the first instar larva of Helophorus (Lihelophorus) yangae sp. nov. a – ventral view; b – dorsal view; c – lateral view.

Fig. 9 in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 9. Association of reared larvae and field-collected adults of Helophorus (Lihelophorus) based on cox1 sequences. a – Bayesian inference of newly obtained and available GenBank sequences; b–c – habitus of reared larvae (b – H. yangae sp. nov.; c – H. lamicola Zaitzev, 1908).

Fig. 6 in Taxonomy, larval morphology and cytogenetics of Lihelophorus, the Tibetan endemic subgenus of Helophorus (Coleoptera: Hydrophiloidea)

Fig. 6. Aedeagophores of Helophorus (Lihelophorus) species. a–e – H. (L.) ser Zaitzev, 1908 (a – lectotype, Qinghai: valley of Alag Hu lake; b–c – Xizang: valley SE of Dong La pass; d – Qinghai: Golo, 20 km E of Maduo; e – Qinghai: Zuimatan). f–j – H. (L.) lamicola Zaitzev, 1908 (f – lectotype, Qinghai: Djarin Nor; g–i – Qinghai: Zuimatan; j – paralectotype, Xizang: S of Arka-tagh, 5073 m a.s.l., lgt. S. Hedin). k–o – H. (L.) yangae sp. nov. (k – holotype, Qinghai: Zuimatan; l–m – paratypes, same locality; n – Qinghai: Golo, Yematan; o – Xizang: Gongbujiangda).