Cryptic diversity in Andrognathuscorticarius Cope, 1869 and description of a new Andrognathus species from New Mexico (Diplopoda, Platydesmida, Andrognathidae) Author Shorter, Patricia L. Author Hennen, Derek A. Author Marek, Paul E. text ZooKeys 2018 786 19 41 http://dx.doi.org/10.3897/zookeys.786.27631 journal article http://dx.doi.org/10.3897/zookeys.786.27631 1313-2970-786-19 2AF1D9E21ECE49A88EC596A55447A239 Genus Andrognathus Cope, 1869 Type species. Andrognathus corticarius Cope, 1869: 182; Gardner 1975 : 15, figs 1, 5-7; Hoffman 1999 : 180; Shear and Marek 2009 : 157, figs 1-10. Other species included. Andrognathus corticarius Cope, 1869, Andrognathus hoffmani Shear & Marek, 2009, Andrognathus grubbsi sp. n. Genus diagnosis. Adult Andrognathus differ from other andrognathid genera based on the following: Exoskeleton : Adults with 45-70 rings. Individuals long (11 to 27 mm) and thin, less than one mm wide, with short paranota, not covering legs (as in Brachycybe ). Color varies from cream to dark brown (Figure 1), with paranota lighter, not pink as in Gosodesmus Chamberlin, 1922, Ischnocybe Cook & Loomis, 1928, Brachycybe . Entire body pilose, particularly head and antennae. Head rounded, pear-shaped, nearly truncate, eyeless (Figure 4). Antennae enlarged apically, slightly elbowed at fourth antennomere (Figure 4). Gnathochilarium and labrum tightly appressed, mandibles not visible externally. Anterior margin of labrum smooth, with small depressed triangular area (Figs 4, 5A, B); without ramified cuticular papillae (as in Brachycybe ). Paranota of ring five swept forward (anteriorly); distinctly bilobed in corticarius (Figure 2A). Paranotal caudolateral margins posterior to ring five sharply projecting caudally, unlike Gosodesmus where the paranotal margins are quadrate. Porosteles clearly differentiated, ozopores rimmed with peritrema, directed anteriorly on ring five (Figs 2, 5C), laterally on remaining rings. Telson: Hypoproct absent, preanal ring barrel-shaped (Figure 5D). Gonopods : Anterior gonopods rounded and robust; A6 spatulate (Figs 6-9) not with a distal series of thin ribbon-like styli, as in Brachycybe . Posterior gonopod long with P6 extended beyond A6, ending in a variable crown, which may be elongated, spatulate, or bifurcate (Figs 6-9) but never composed of a bundle of styli as in Brachycybe . P6 with medial spur-like process (possibly claw/tarsungulum). See also diagnosis of Andrognathus in Shear and Marek (2009) . Figure 4. Andrognathus corticarius head and anterior body rings, ventral view. Scale bar: 0.3 mm. Figure 5. Andrognathus grubbsi sp. n., female paratype, (VTEC Catalog #AND0045). A Head, ventral view B Tip of labrum C Dorsal view of rings 3-7 D Posterior body rings, ventral view. Scale bars: 0.1 mm (A), 0.05 mm (B), 0.5 mm (C), 0.4 mm (D). Figure 6. Gonopod variation within Andrognathus corticarius , ventral view, left gonopods. A Scioto Co., Ohio (view of the mirrored right gonopod, due to damage to the left gonopod) B Raleigh Co., West Virginia C Neotype, Montgomery Co., Virginia (Christiansburg) D Montgomery Co., Virginia (Blacksburg). Scale bars: 0.1 mm. Figure 7. Gonopod variation within Andrognathus corticarius , ventral view, left gonopods. A Pulaski Co., Virginia B Campbell Co., Virginia C Carroll Co., Virginia D Madison Co., North Carolina. Scale bars: 0.1 mm (A, C, D), 0.05 mm (B). Figure 8. Gonopod variation within Andrognathus corticarius , ventral view, left gonopods. A Lee Co., North Carolina B Chesterfield Co., South Carolina C DeKalb Co., Alabama D Liberty Co., Florida. Scale bars: 0.05 mm (A, B), 0. 1 mm (C, D). Figure 9. Andrognathus gonopods, ventral view of left gonopods. A Andrognathus corticarius (podomeres A1, A2 missing) B Andrognathus hoffmani C Andrognathus grubbsi sp. n. A6: anterior gonopod podomere 6. P6: posterior gonopod podomere 6. Scale bars: 0.1 mm(A, B), 0.05 mm (C). Note. Andrognathus was placed in Andrognathinae (a monotypic subfamily) due to the lobed condition of the fifth pair of paranota (Hoffman, 1980).