Eurylychnus cylindricus Sl. Id. By T. G. Sloane 1916
Creators: name: Lay, Stuart
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Carabidae
Eurylychnus
Eurylychnus cylindricus

description: Eurylychnus cylindricus Sloane, 1916
(Figs. 1B, 2B, 4D–F)
Eurylychnus cylindricus Sloane, 1916: 199. Moore et al. 1987: 120 (catalogue). Häckel et al. 2010: 65 (checklist).
Type material: Lectotype, here designated: (1), Type, Barrington R., 5200 ft. Brush, T. G. S. 29.12.15 [handwritten] // Type // Eurylychnus cylindricus Sl. Id. By T. G. Sloane [handwritten and typed] // Eurylychnus cylindricus Sl. HOLOTYPE PJD [red label, handwritten and typed], (ANIC) [Darlington placed a holotype label on the specimen but did not publish that action]. Paralectotypes, here designated: (2), Barrington R, 5200 ft. Brush, T. G. S., 29.12.15 [handwritten] (ANIC); (1), Barrington R, 5200 ft. Brush, T. G. S., 29.12.15 [handwritten] // ♀ [handwritten symbol] (ANIC); (1) [♀], Barrington R, 5200ft. Brush, T.G.S., 29.12.15 // Eurylychnus cylindricum Sl., Id. By T. G. Sloane // ANIC Specimen [green label] (ANIC); (1), Barrington R, 5200ft Brush, T.G.S., 29.12.15 // Cotype 2569 [blue label] // Eurylychnus cylindricus Sl. Id. by T. G. Sloane // F. E. Wilson Collection (MV); (1), Williams R 4500ft Brush, T.G.S., 27.12.15 // Pres [?] by T.G. Sloane 584[?] 12-6-16 // Eurylychnus cylindricus Sl, Id. by T. G. Sloane. // Cotype [blue label] // PARATYPE, T-11819, Eurylychnus cylindricus [blue label] (MV); (1), Barrington R., 5200ft Brush, T. G. S., 29.12.15 // Pres by T. G. Sloane B09[?] // Eurylychnus cylindricus Sl. Id. by T. G. Sloane. // Cotype [blue label] // PARATYPE, T-11820, Eurylychnus cylindricus [blue label] (MV); (1), Barrington Tops NSW, 29.12.1915, A. Musgrave, 4800ft // Eurylychnus cylindricus Sl Id. by A. M. Lea // Cotype [blue label] // PARATYPE, T-11821, Eurylychnus cylindricus [blue label] (MV).
Other material examined (29): New South Wales: (2), Barrington Tops, H.J. Carter (ANIC); (1), Barrington Tops, v.1937, Few (ANIC); (1), Barrington Tops, 7.xi.1959, B.P. Moore (ANIC); (6) [1 ♁, 5 unknown sex], Barrington Tops, 25–6.xi.1963, B.P. Moore (ANIC); (2), Barrington Tops, 24.iii.2001, C. Rojewski (ANIC); (2), Barrington Tops, i.1925, SU ZooExp (ANIC); (1), Barrington Tops NP, Devils Hole, 12.ii.2022, S. Lay (SLC); (7) [4 ♁, 3 ♀], Barrington Tops NP, Honeysuckle area 12.ii.2022, S. Lay (SLC); (1) [♀], Barrington Tops, Nothofagus forest, 8.ii.1996, S. Watkins (ANIC); (3) [1 ♁, 2 ♀], Barrington Tops NP, Quarry Road 12.ii.2022, S. Lay (SLC); (1) [♀], Barrington Tops NP, Wild Turkey Road, 12.ii.2022, S. Lay (SLC); (1), Eccleston, iii.1921, T.G. Sloane (ANIC); (1), Mount Royal Range, 36km E[ast] Moonan Flat, 7.xi.1982, J. Doyen (ANIC).
Diagnosis: Eurylychnus cylindricus has a large body size like E. regularis and E. blagravei, however E. cylindricus is narrower and more cylindrical in form (Fig. 2B), and its elytral striae and transverse impression behind the eyes are less distinct. Eurylychnus cylindricus is sympatric with E. ovipennis, however E. cylindricus has a larger body length (<16.5mm) and has only a single seta either side of the pronotum, unlike E. ovipennis which has 4 setae on either side of the pronotum.
Redescription: Body shiny black, cylindrical in form, legs black, sometimes reddish-black, palps piceous. Body length 16.5–20.4mm; maximum pronotum width 4.7–5.6mm; maximum elytra width 5.3–6.2mm.
Head: Vertex smooth, with sparse minute micropunctures. Transverse impression behind the eyes weak. Frontal impressions curving inwards anteriorly, joining the frontoclypeal suture and extending onto the clypeus where they terminate with a seta before the anterior margin. Clypeus anterior margin straight or weakly emarginated. Labrum anterior margin straight or weakly emarginated, with 6 evenly spaced setae on its dorsal anterior edge, with the outermost setae longer than the inner 4. Eyes with a single supraorbital seta. Mandibles with a seta in the scrobe. Median tooth of mentum bifid, relatively broad, with a basal seta each side; paramedian foveae present; lobes broad. Submentum with 2 setae. Stipes with 2 setae each, the inner seta more than double the length of the outer seta. Gula convex with some sparse wrinkles; gular sutures with small gular pits.
Thorax: Pronotum covered with sparse minute micropunctures, becoming reticulation of fine meshes on lateral margins; sometimes with transverse wrinkles from median impression; foveae present adjacent to the basal angles, sometimes joined by a transverse row of faint punctures; posterior margins gently rounded to base, lacking tubercles on basal angles; pronotum widest at or slightly above the midline, with 1 seta on the lateral margins at or just below the midline; median impression runs most of the length of the pronotum; pronotal carina borders the lateral margins, extending slightly onto the anterior margins and terminates posteriorly at the basal angles. Prosternum very convex, smooth or with some wrinkles, with a raised margin on anterior border. Protrochanters with 1 seta each. Males lacking squamose setae on ventral surface of protarsi (Fig. 1B). Metatrochanters without a seta. Mesocoxae with or without a seta. Metacoxae with 1 seta on anterior margin.
Elytra: Elytral disc convex and elongate; covered in reticulation of fine meshes, sometimes confined to the edges of each interstice in the apical half of the elytra; lateral elytral carina extending from humerus to apex. Parascutellar striole isolated from striae 1, although sometimes faint. Elytra with 8 striae; striae 1–7 weakly to moderately defined, stria 8 almost indistinct; striae 3 and 4 converging or sub-parallel basally and stria 5 begins at the humeral angle; interstices flat; striae sometimes with small obsolete punctures. Basal groove with 3 asetose obsolete punctures either side of the suture. Humerus simple.
Abdomen: Ventrites 3–5 lacking setae. Apical margin of ventrite 6 with a pair of paramedian setae.
Male genitalia: Aedeagus left paramere (Fig. 4D) broad, asetose, constricted dorsally in apical ¼ to form a long blunt denticle; right paramere (Fig. 4E) long, narrow, width uniform for most its length, only tapering to a point at the apex, setae present along the ventral margin of the apical half. Median lobe (Fig. 4F) weakly to moderately curved ventrally, slightly to moderately deflected to the right; apex blunt and rounded.
description: Published as part of Lay, Stuart, 2023, A taxonomic review of the Australian genus Eurylychnus Bates (Coleoptera: Carabidae: Broscini), pp. 247-264 in Zootaxa 5330 (2) on pages 252-253, DOI: 10.11646/zootaxa.5330.2.4, http://zenodo.org/record/8249352