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Figs. 19–21 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 19–21. Euceratocerus parvus female collected from Brazos Co., TX. 19) Dorsal view; 20) Lateral view;

Figs. 15–17 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 15–17. Euceratocerus hornii female collected from Jeff Davis Co., TX. 15) Dorsal view; 16) Lateral view;

Figs. 7–9 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 7–9. Holotype of Euceratocerus hornii collected from TX. 7) Dorsal view; 8) Lateral view; 9) Anterior view.

Figs. 4–6 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 4–6. Euceratocerus gibbifrons female collected from Pickens Co., SC. 4) Dorsal view; 5) Lateral view;

Figs. 12–14 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 12–14. Euceratocerus hornii male collected from Uvalde Co., TX. 12) Dorsal view; 13) Lateral view; 14) Antenna.

Fig. 10 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Fig. 10. Antennae of all male Euceratocerus species from the United States (modified from White 1974).

Figs. 1–3 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Figs. 1–3. Euceratocerus gibbifrons male, from Union Co., NC. 1) Dorsal view; 2) Lateral view; 3) Antennae.

Fig. 11 in Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA

Fig. 11. Illustrations of antennae of female Euceratocerus gibbifrons and female E. hornii [modified from Fall (1905) and White (1971), respectively].

Fig. 6 Enchytraeus albidus s. str. a Male apparatus viewed dorsally. b in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 6 Enchytraeus albidus s. str. a Male apparatus viewed dorsally. b Schematic illustration of the male apparatus in cross section. ag accessory glands, pb penial bulb, vd vas deferens. Scale bar 100 μm

Fig. 4 Enchytraeus albidus s in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 4 Enchytraeus albidus s. str., live specimen, from the same locality as CE20518 (see Table 1). Photo: C. Erséus

Fig. 7 Enchytraeus albidus s. str. a–d in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 7 Enchytraeus albidus s. str. a–d Spermathecae. ed ectal duct, eg ectal gland, sa spermathecal ampulla, sd spermathecal diverticulum, sm sperm. Scale bars 100 μm

Fig. 9 Enchytraeus moebii a male copulatory apparatus. b–c in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 9 Enchytraeus moebii a male copulatory apparatus. b–c Spermathecae. ag accessory glands, ed ectal duct, eg ectal gland, mu musculature, pb penial bulb, sa spermathecal ampulla, sm sperm, vd vas deferens. Scale bar 100 μm

Fig. 2 Species tree for the E in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 2 Species tree for the E. albidus species complex (shaded), estimated using the multi-locus coalescent model. The number of included speci- mens for each species is given after the species name. Values above branches are posterior probability (PP) support values, values under terminal branches are mean PP from species delim- itation analyses in BPP, written as: mean analysis A/mean analysis B/ mean analysis C. Scale measures the branch lengths in proportion to total tree length

Fig. 12 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 12 Enchytraeus cf. krumbachi a vas deferens, showing the transition between the thin- and thick-walled portions; note the lack of cilia inside the thick-walled part. b Male copulatory apparatus. c Spermatheca. ag accessory gland, ed ectal duct, eg ectal gland, pb penial bulb, sa spermathecal ampulla, sm sperm, vd vas deferens. Scale bars 100 μm

Fig. 3 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 3 Gene trees for the Enchytraeus albidus species complex (shaded), estimated by using Bayesian Inference. a COI. b H3 (specimens marked with B-1^ or B-2^ after the species name are heterozygous and the

Fig. 11 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 11 Enchytraeus albellus Klinth, Erséus and Rota, sp. nov., holotype. a Sperm funnel. b Transverse section comparing thin- and thick-walled portions of vas deferens. c Longitudinal sec- tion comparing thin- and thick- walled portions of vas deferens. d Male apparatus. e Spermatheca. ag accessory glands, ed ectal duct, eg ectal gland, mu musculature, pb penial bulb, sa spermathecal ampulla, sf sperm funnel, sm sperm, vd vas deferens. Scale bars 100 μm

Fig. 8 Enchytraeus pellucidus Friend, 1899 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 8 Enchytraeus pellucidus Friend, 1899, sensu Stirrup (1913), section through two specimens during copulation (reproduced from Stirrup 1913, pl. XLIX, fig. 19)

Fig. 10 Enchytraeus moebii 3 male apparatus and 7 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 10 Enchytraeus moebii 3 male apparatus and 7 spermatheca; from Michaelsen (1886; pl. II figs. 3., 7.)

Fig. 1 in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 1 Collecting localities and species found in each area. For the sake of clarity, several close localities along the Norwegian and Swedish coasts have been merged; see Table 1 for a detailed description on each locality

Fig. 5 Enchytraeus albidus s. str. a in The popular model annelid Enchytraeus albidus is only one species in a complex of seashore white worms (Clitellata, Enchytraeidae)

Fig. 5 Enchytraeus albidus s. str. a Internal morphology of segments I– VI and IX–XIV viewed from dorsal side. b Brain. c Bundle of chaetae. d Nephridium. ag accessory glands, as anteseptale, br brain, cl clitellum, nd nephridial efferent duct, ov ovary, pb penial bulb, pg pharyngeal glands (only ventral lobes illustrated), ph pharyngeal pad, ps postseptale, s spermatheca, sf sperm funnel, t testis, vd vas deferens. Scale bars 100 μm