Lathrobium freyi Koch 1938
Creators: name: Staniec, Bernard
name: Bordoni, Arnaldo
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Lathrobium
Lathrobium freyi

description: Lathrobium freyi Koch, 1938
Body strongly elongate, moderately flattened, relatively slightly sclerotized; head slightly (1.1×) wider than pronotum (Figs 2, 5, 8). Colour: head and mandibles yellowish-brown; pronotum dark yellow with hardly visible darker posterior edge; antennae, maxillae, labium, legs, urogomphi and remaining parts of body colourless. Setae similar to those illustrated in Figs 86–90.
Head (Figs 11, 16): almost U-shaped in outline, widening moderately from neck to anterior margin, broadest between stemmata, width ratio of neck and head between stemmata = 1:3.5; moderately flattened dorso-ventrally, about 1.2× as wide (between stemmata) as long; dorsal ecdysial lines (Es) bifurcate at about 0.25× length of head measured from anterior margin of nasale; stemmata present, ordered as in Fig. 14. Epicranial part (E) (Fig. 11) with 6 pairs of long setae (coded: Ed1–3, El1, Em2–3), a pair of glands (Gl) and a pair of pores (C1). Chaetotaxy of ventral side with 8 setae (2[V1, Vl1–3]). Apotome (Ap) not reaching tentorial pits (Tp) (Figs 16, 19). Gular region as in Fig. 22. Functional position of nasale (Na), antennae (At), mandibles (Md), maxillae (Mx), maxillary palps (Mp), labial palps (Lp) and ligula (Lg) as in Fig. 91.
Antenna (Figs 26, 27): length ratios of articles I–IV = 1:3.5:3.2:1.7. Article I almost as wide as long; article II 4.3× as long as wide, with 3 pores; article III 4.0× as long as wide, with 3 macro setae, one moderately elongate, finger-shaped and slightly curved sensory appendage (Sa), 4.8× as long as wide, growing from basal protuberance, 3 solenidia (IIIS1–3) of different lengths, and 1 pore (Figs 26, 27); article IV robust, clearly club-shaped, widening strongly to apex 3.1× as long as wide, solenidia apically (IVS1–4) as in Fig. 27; length ratio of article IV and Sa: 1.1:1 (Fig. 27). Anterior margin of nasale with 9 teeth (Figs 32, 33)—one small median (Mt) rounded anteriorly (Fig. 33), a pair of high paramedian (Pmt) and three pairs of lateral ones (Lt1–3) (Fig. 32); Lt1 tiny almost invisible, Lt3 clearly pointing outwards, the others forwards, height ratio Mt and Pmt = 1:2.2; width ratio Mt and Pmt = 1:1.3; setae of Ps1–4 nodular or peg-like (Figs 32, 96). Adoral surface of nasale (epipharynx) (Fig. 38) with transverse row of at least 100 cuticular processes (Acp) along anterior margin of buccal cavity (Bc); pharynx (Ph) with a pair of sensilla (Sm); anterior region with indistinct, reticulate microstructure (Fig. 39). Mandible (Figs 45, 91) falciform, moderately elongate and narrow, inner margin without any teeth. Maxilla (Figs 49, 53): length ratio of cardo (Cd) and stipes (Stp) = 1:1.4; cardo 1.2× as long as wide; stipes 2.2× as long as wide; mala (Ma) short and stocky, tapering distinctly to apex, 2.9× as long as wide, with 4 long spine-shaped setae (longest seta on apex), a few tiny apical sensory appendages and 2 pores basally (Fig. 53). Maxillary palp (Pm): ratios of articles I–III = 1:1.3:2.1; article I 1.2× as long as mala, 2.9× as long as wide with 2 pores apically; article II 4.2× as long as wide, widening moderately to apex, seta 1 shorter than seta 2, seta 2 located closer to base than to top; article III 9.5× as long as wide with 1 digitiform sensory appendage basally and a bunch of a few elongate sensory appendages apically (Fig. 49). Labium (Figs 56, 106): dorsal side of labium (hypopharynx) slightly sclerotized on sides, central and basal portion membranous, microtrichia in anterior and central areas (Figs 56, 106). Ventral side of labium with trapezoidal prementum (Pmnt), in outline 1.2× wider anteriorly than at base (Fig. 59); ligula (Lg) with long thick microtrichia, about 2.4× as long as wide, slightly separated from Pmnt by poorly sclerotized transversal strip; length ratio Lg and article I of labial palp (Lp): 1:1.4. Labial palps (Fig. 62): article I 4.0× as long as wide, moderately bent in mid-section; article II bent near apex, 5.5× as long as wide, with a bunch of a few sensory appendages apically; length ratio of articles I and II = 1.7:1.
Thorax. Fore leg: length ratios of Cx, Tr, Fe, Tb, Tu = 7.6:2.5:8.6:6.5:1; Cx 3.1× as long as wide; Tr 3.1× as long as wide; Fe 7.8× as long as wide with about 40 spinose setae (about 15 tiny dorsally) and a few pores; Tb 15.0× as long as wide with 22–25 setae (9 long); Tu curved regularly, short respectively, 3.7× as long as wide, setae (coded 1, 2) unequal in length, seta 1 2.0× longer than seta 2 (Fig. 70). Mid leg (only differences compared to the first pair): length ratios of Cx, Tr, Fe, Tb, Tu = 6.1:2.3:6.6:6.6:1; Cx 3.1× as long as wide; Tr 2.9× as long as wide with 7 setae and a few pores; Fe 6.8× as long as wide with about 30 setae; Tb 14.7× as long as wide with about 21 setae; Tu as in fore leg (Fig. 70). Sternum with chaetotaxy as in Figs 77, 77A.
description: Published as part of Staniec, Bernard & Bordoni, Arnaldo, 2022, Comparative larval ultramorphology of three endemic Lathrobium (Glyptomerus) species (Coleoptera, Staphylinidae, Paederinae) from the Eastern Alps in Italy, pp. 206-230 in Zootaxa 5175 (2) on pages 220-221, DOI: 10.11646/zootaxa.5175.2.2, http://zenodo.org/record/7003475