Twenty-one new species of the Neotropical rove beetle genus Neolindus Scheerpeltz (Coleoptera, Staphylinidae, Paederinae) Author Guzman, Yoan Camilo AD8443F6-89D0-4F71-9F67-4040D20ECB02 Museum and Institute of Zoology, Polish Academy of Sciences, Warsaw, Poland. ycamiloguzmans@gmail.com Author Tokareva, Alexandra F2DB3539-310F-4453-81FA-A6BC0D5C885D Museum and Institute of Zoology, Polish Academy of Sciences, Warsaw, Poland. atokareva@miiz.waw.pl Author Koszela, Katarzyna 06C16202-4569-4156-9FB1-EA4DEE14AE88 Museum and Institute of Zoology, Polish Academy of Sciences, Warsaw, Poland. kat.koszela@gmail.com Author Żyła, Dagmara 0A7FEB0F-308C-4FDF-AD0D-8074BC69F0B3 Museum of Nature Hamburg, Leibniz Institute for the Analysis of Biodiversity Change, Hamburg, Germany. ycamiloguzmans@gmail.com text European Journal of Taxonomy 2024 2024-06-24 942 1 76 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2581/11745 journal article 300001 10.5852/ejt.2024.942.2581 5200ad90-b89a-4d6e-b7f8-de33e9bc509c 2118-9773 12550288 DF991BC4-1761-4C5D-96E5-EFC62F8F7D1A Neolindus triangularis Guzman, Tokareva & Żyła sp. nov. urn:lsid:zoobank.org:act: 040BF5AB-B5AC-4EFB-BDA4-1163885E5865 Fig. 20 ; Supp. file 2 Diagnosis Neolindus triangularis sp. nov. is similar to N. milleri and N. bicornis . nov. in the shape of the median lobe of the aedeagus. However, the aedeagus of N. triangularis differs from that of N. milleri in the structure and composition of apical sclerites ( Herman 1991 ; fig. 189; Fig. 20F–I ) and has an acute base of the median lobe with a short median ridge on the parameral side, in contrast to the median lobe of the aedeagus in N. bicornis . Additionally, N. triangularis has noticeably wider fused pLS in the middle part, and a longitudinal invagination in sternite VIII continuing from the middle part of the emargination, limited by 2 ridges on the sides, which is absent in N. bicornis ( Figs 4E–I , 20E–I ). Etymology The name is derived from the Latin noun ‘ triangulus ’ meaning ‘a triangle”, and refers to the form of the median lobe of aedeagus. An adjective. Type material Holotype FRENCH GUIANA • ♂ ; “ Neolindus triangularis Guzman, Tokareva & Żyła 2024 HOLOTYPE [red label] \\ Saül , 7 km N, 0.5 km ESE , Les Eaux Claires , Monts La Fumée ; 3°39’46’’N , 53°13’19’’W , 300 m [m a.s.l.]; 4–8 Jun 1997 ; J. Ashe , R. Brooks Leg.; FGAB97 164; ex: flight interception trap \\ SMO134030 KUNHM-ENT [barcode]”; KUNHM-ENT . Paratypes FRENCH GUIANA • 1 ♀ ; “ Neolindus triangularis Guzman, Tokareva & Żyła 2024 PARATYPE [yellow label] \\ Matoury , 41.5 km SSW on Hwy N2 ; 4°37’22’’N , 52°22’35’’W ; 50 m ; 26-28 May 1997 ; J. Ashe , R. Brooks Leg.; FG1AB97 060; ex: flight intercept trap \\ SM0099449 KUNHM-ENT [barcode]”; KUNHM-ENT • 1 ♀ ; “ Saül , 7 km N , Les Eaux Claires ; 220 m ; 3°39’46’’N , 53°13’19’’W ; 30 May–04 Jun 1997 ; J. Ashe , R. Brooks Leg. ; FG1AB97 144 \\ SM0131297 . KUNHM-ENT [barcode]”; KUNHM-ENT . Description MEASUREMENTS . BL (7.9), H (0.43,1.06), A (1.43),A1 (0.4, 0.1),A2 (0.11, 0.07),A3 (0.22, 0.08),A4 (0.15, 0.09), A5 (0.15, 0.09), A6 (0.13, 0.09), A7 (0.12, 0.09), A8 (0.12, 0.1), NKW (0.42), GL (0.23), P (0.99, 1.22), E (1.56, 1.47), PC (0.63, 0.31), PF (0.96, 0.28), PT (0.67, 0.12), MSC (0.44, 0.41), MSF (1.1, 0.2), MST (0.76, 0.09), MTC (0.36, 0.31), MTF (1.24, 0.23), MTT (0.83, 0.1). COLOURATION . Head and pronotum brown; legs light brown; abdomen brown. HEAD . Head capsule wider than long; anterior margin sinuate, dorsoventrally deflexed, slightly elevated; posterior margin rounded; posterior angles straight; setation with 1 pair of PCS and 1 row of PMS. Epicranium with umbilicate, low-density micropunctuation, setation with 1 pair of FS and 2 pairs of PFS, without OS. Gena with irregular depressions; setation with 1 OT, MS, and POS; sockets of MS and POS umbilicate. Postgena with row of 2 setae in line from eye to gular suture; gular sutures reaching posterior margin of head joining neck pits; anterior part of gula with 2 setae; posterior margin of head with 2 setae near gular sutures. Neck with foramen magnum occupying ¾ of occiput.Antenna moniliform from antennomere 5, shorter than head and pronotum combined ( Fig. 20A ); antennomeres longer than wide, tomentose pubescence starting from antennomere 4; antennomere 1 as long as antennomeres 2 and 3 combined, antennomere 3 longer than 2. Labrum tetralobed; central lobes well-developed; central emargination shallow, V-shaped ( Fig. 20A ; Supp. file 2). Fig. 20. Neolindus triangularis Guzman, Tokareva & Żyła sp. nov. , holotype, ♂ (KUNHM-ENT). A . Habitus, dorsal view. B−E .Abdominal segments, posterior margin schemes. B . Tergite VII. C . Sternite VII. D . Tergite VIII. E . Sternite VIII. F−I . Aedeagus. F . Parameral view. G . Parameral view scheme. H . Lateral view. I . Lateral view scheme. Scale bars: A = 1 mm; B–I = 0.25 mm. THORAX . Pronotum slightly wider than long, with umbilicate randomly distributed micropunctures. Metasternal intercoxal process with 1 pair of acute processes. Elytron longer than wide, surface of elytra with moderately dense umbilicate punctures in 10–11 longitudinal rows ( Fig. 20A ; Supp. file 2). LEGS . Protibia with 4 well-developed combs of setae; apical comb longitudinal, composed of widely separated, thin setae; mesotibial apical ctenidium on both sides, inner longer than outer; mesotarsomere 1 longer than mesotarsomere 2, mesotarsomere 2 longer than mesotarsomere 3, mesotarsomere 3 as long as mesotarsomere 4, mesotarsomere 5 as long as mesotarsomere 2; inner ctenidium of metatibia longer than outer. Metatarsomere 1 longer than metatarsomere 2, metatarsomere 2 longer than metatarsomere 3, metatarsomere 3 as long as metatarsomere 4, metatarsomere 5 as long as 2. ABDOMEN . Tergites with low-density randomly distributed micropunctuation. Posterior margin of tergite VII straight ( Fig. 20B ). Male : posterior margin of sternite VII with small short midside emargination ( Fig. 20C ). Posterior margin of sternite VIII with V-shaped midlongitudinal emargination, lateral angles rounded ( Fig. 20D ). Posterior margin of tergite VIII with median acute elongation, lateral angles slightly lobed ( Fig. 20E ). Posterior margin of tergite IX with midlongitudinal deep emargination in ¾ of segment length; aedeagus, median lobe acute at base, widening apically and well-sclerotised; with small suture connecting basal acute tip of median lobe with elevated area around basal foramen. pLS fused into flattened arcuate sclerite widening in middle with 2 acute processes on each side protruding distad from median foramen and ending bent to anti-parameral side. APS flattened, arcuate, smaller than pLS, with 2 acute processes on each side protruding distad from median foramen and ending bent to parameral side shorter than processes of pLS. pPMS not visible ( Fig. 20F–I ). Female : lack of emargination on posterior of sternite VII; posterior margin of tergite VIII sligthtly lobulated. Distribution The species is known from the type locality in French Guyana (Saint-Laurent-du-Maroni, Saül, Monts La Fumée), the surrounding forest, and around 130 km SE from the type locality (Cayenne, Matoury). It was collected between 50–300 m a.s.l. using flight interception trap.