Isanopus itoupe Klemann-Junior & Chatzimanolis 2025, sp. nov.
Creators: name: Klemann-Junior, Louri
name: Chatzimanolis, Stylianos
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Isanopus
Isanopus itoupe

description: Isanopus itoupe Klemann-Junior & Chatzimanolis, sp. nov.
https://zoobank.org/ urn:lsid:zoobank.org:act: 7A34C8F1-07ED-44E8-9DCA-182CEAFE75A4
(Figs 1A–D, 2A–E)
Type material (5 ♂♂, 10 ♀♀).
Holotype: FRENCH GUIANA: ♂, labeled: “French Guiana: Mont Itoupé[Itoupé Mountain] | DZE 570[trap code] -FIT[flight intercept trap] - 800m [above sea level] | 17.iii[March].2010 | 3°01'23''N / 53°05'44''W |SEAG[Société Entomologique Antilles Guyane] | CESIT-UEA[Centro de Estudos Superiores de Itacoatiara—Universidade do Estado do Amazonas] [left sideline]”, “HOLOTYPE [red label] | Isanopus | itoupe sp. nov. | Desig. Klemann-Junior | & Chatzimanolis 2024” (INPA). Paratypes: FRENCH GUIANA: (4♂♂, 10 ♀♀), labeled: “French Guiana: Mont Itoupé[Itoupé Mountain] | DZE 570[trap code] - FIT[flight intercept trap] - 800m [above sea level] | 17.iii[March].2010 | 3°01'23''N / 53°05'44''W | SEAG[Société Entomologique Antilles Guyane] | CESIT-UEA[Centro de Estudos Superiores de Itacoatiara—Universidade do Estado do Amazonas] [left sideline]”, “PARATYPE [yellow label] | Isanopus | itoupe sp. nov. | Desig. Klemann-Junior | & Chatzimanolis 2024” (1♂, 2♀♀ CEMT; 1♂, 2♀♀ DZUP; 1m, 4♀♀ INPA; 1♂, 2♀♀ UEA).
Diagnosis. Among Isanopus species that have convex pronotum in lateral view, Isanopus itoupe sp. nov. can be differentiated from I. tenuicornis and I. sallaei by the coloration of antenna (Fig. 1C), proportion of antennal segments 5–10, and the distinctive shape of aedeagus (Figs 2B–E). Antenna dark brown in I. itoupe sp. nov. (antennal segments 4–11 yellow in I. tenuicornis and I. sallaei). Antennal segments 5–10 two times longer than wide in I. itoupe sp. nov. (three times longer than wide in I. tenuicornis and 2.5 times longer than wide in I. sallaei). Paramere of I. itoupe sp. nov. in parameral view expanded before apex (not expanded before apex in I. tenuicornis and I. sallaei); with slightly rounded, bilobed apex (apex straight, with no apical processes in I. tenuicornis; apex converging to two apical processes, with narrow U-shaped emargination between them in I. sallaei); without peg setae. Median lobe of I. itoupe sp. nov. in lateral view with apex rounded and a small ventral tooth (median lobe strongly curved from middle to apex, without ventral tooth in I. sallaei).
Description. Holotype male, BL: 10.72 mm, FL: 5.84 mm.
Coloration. Head, pronotum and scutellum dark brown to black (Fig. 1A–B). Antenna dark brown (Fig. 1C). Legs dark brown; tarsi light brown, becoming lighter from the first to the fifth tarsomere (Fig. 1A). Elytra (Fig. 1A) dark metallic blue, purplish blue, sometimes with greenish overtones. Abdomen (Fig. 1A, 2A) dark brown, almost black; except segment VII with anterior 1/2 dark brown and posterior 1/2 orange, and segments VIII–IX orange. Prosternum, meso- and metaventrite dark brown.
Head (Fig. 1A–B) wider (HW: 1.68) than long (HL: 1.44), width: length ratio=1.17, with rounded hind angles. Head with long dark brown macrosetae along borders. Head with medium size umbilicate punctures each carrying dark brown microsetae; umbilicate punctures absent in middle and denser at the inner margin of eyes and posteriorly; punctures smaller around eyes and at base of head. Distance between punctures vary, from a small ridge (with some confluent punctures) to two times width of punctures. Integument of epicranium with dense microsculpture formed by transverse lines uniformly distributed; few micropunctures distributed at middle. Eyes prominent, length (OL: 0.71) about 1/2 the length of head, distance between eyes (IO: 1.12) about 3.6 times the width of eyes (OW: 0.31). Antennal segments (Fig. 1D) 1–11 gradually club-like thickened, longer than wide, with long macrosetae; segments 4–11 densely covered by microtrichae; segment 1 about twice as long segment 2 length; segment 3 about 1.5 times segment 2 length; segment 4 about 0.75 times segment 3 length; segments 5–10 almost identical, two times longer than wide; segment 11 subequal to previous segments. Neck with irregular punctures and micropunctures; integument with dense microsculpture formed by transverse lines uniformly distributed.
Pronotum (Fig. 1A–B) longer than wide (PL: 2.04; PW: 1.67), width: length ratio=0.82; pronotum broadest in apical 1/3 and narrower just below the midpoint; anterolateral angles obtusely rounded curved; from the anterolateral angle, the pronotum touches the neck through a smooth concave curve; anterior midline with a smooth convex curve; lateral margins strongly concave in dorsal view; pronotum slightly convex in lateral view. Pronotum with dark brown microsetae and, along borders, few dark brown macrosetae. Medium size umbilicate punctures distributed in 4–9 rows; punctures absent on disc of pronotum; least distance between punctures for each row as wide as 1–2 punctures; anterolateral angles densely punctuated, distance between punctures as wide as 0.5–1.2 punctures. Integument of pronotum glossy, with dense microsculpture formed by transverse lines uniformly distributed and few micropunctures. Scutellum prominent, with dark brown microsetae, densely punctuate, punctures confluent. EL/PL ratio=1.16.
Elytra (Fig. 1A) quadrate (EL: 2.36; EW: 2.36), wider than pronotum; with medium size punctures; punctures smaller than head and pronotum; distance between punctures as wide as 0.6–1.3 punctures (about 8 punctures/ 0.5 mm); covered with dark brown microsetae and few long dark brown macrosetae along the lateral borders.
Legs (Fig. 1A). Profemur with dark brown microsetae; protibia with pale microsetae; protarsus dorsoventrally flattened, with yellow microsetae. Middle and hind legs with dark brown microsetae; mesotibia and metatibia with spines on the external side and with apical spurs; meso and metatarsus elongated and enlarged, with brown microsetae dorsaly and light brown to yellow microsetae ventrally; tarsomeres 1–4 asymmetrical, apically dilated.
Abdominal (Fig. 1A) segments III–VI with dense and uniform punctation pattern; punctation smaller than head, pronotum, and elytra; punctuation in each segment becoming less dense from anterior to posterior region. Segment VII with denser punctuation than the previous segments on anterior 1/2 (dark brown region), posterior 1/2 (orange region) with sparser punctuation. Tergite VIII with few, very sparse, punctures; sternite VIII (Fig. 2A) with dense punctuation on anterior 1/3 and sparse punctuation on posterior 2/3. Each puncture with dark brown microsetae on segments III–VI and anterior 1/2 of segment VII; punctures with yellow microsetae on posterior 1/2 of segment VII and on segment VIII; few long dark brown macrosetae along borders of all segments. Lateral tergal sclerites of segment IX long and straight, covered with long brown and yellowish macrosetae. Abdominal tergites III–V with tergal basal carina and no subbasal (arch-like) carina. Posterior margin of sternite VII (Fig. 2A) with shallow and broad emargination at midline; posterior margin of sternite VIII (Fig. 2A) with deep V-shaped emargination at midline; sternite IX emarginate.
Aedeagus as in Figures 2B–E. Paramere extremely reduced; paramere: median lobe ratio=0.41. Paramere in parameral (Fig. 2C) and antiparameral (Fig, 2D–E) view with lateral outline slightly curved; expanded before apex (Fig, 2D–E); with rounded slightly bilobed apex (Fig, 2D–E); without peg setae (Fig, 2D–E); with four long setae on each side of the apex and few setae along paramere. Median lobe in parameral view (Fig. 2B) with lateral outline almost straight; converging, in apical 1/3, to a narrower rounded apex. Median lobe in lateral view (Fig. 2C) becoming narrower apically; with three different angles: 1/3 basal straight, 1/3 middle angled upward, and 1/3 apical angled slightly downward; apex rounded with a small ventral tooth.
Female. Similar to male, except by the posterior margin of sternites VII and VIII straight.
Habitat. Captured with window flight interception trap hung approximately 1.5 m above ground. The capture site is 800 m. a.s.l. and the vegetation is montane Evergreen Tropical Forest “Floresta Ombrófila Densa Montana ”.
Distribution. Known from Mont Itoupé in French Guiana.
Etymology. The specific epithet refers to the name of the mountain where all known specimens were collected, Mont Itoupé; it is a noun in apposition.
description: Published as part of Klemann-Junior, Louri & Chatzimanolis, Stylianos, 2025, A new Amazonian species, description of male of Isanopus sahlbergi Bernhauer, 1917, and a revised key to species of Isanopus Sharp, 1876 (Coleoptera: Staphylinidae), pp. 305-313 in Zootaxa 5575 (2) on pages 306-309, DOI: 10.11646/zootaxa.5575.2.6, http://zenodo.org/record/14746927