Oocyclus
Creators: name: Short, Andrew E. Z.
name: Torres-Gavosto, Juan Martin
name: Hettinger, Ty
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Hydrophilidae
Oocyclus

description: Key to the species of Oocyclus from the northern Andes
1 Elytra with distinct pale spot in posterior third (e.g. Fig. 4A); size smaller (not more than 4.0 mm)..................... 2
- Elytra without distinct pale spot in posterior third; size variable................................................. 4
2(1) Elytra without rows of setiferous punctures; posterolateral corners of pronotum broadly rounded............. O. sapphirus
- Elytra with distinct rows of setiferous punctures (e.g. Fig. 4A); posterolateral corners of pronotum usually appearing weakly spinose............................................................................................. 3
3(2’) Elytra with first line of erect setae distinct and continuous (Fig. 4A); aedeagus with parameres tapering to a nearly flat, blunt tip at apex (Fig. 6F)....................................................................... O. lepidus sp. n.
- Elytra with first line of erect setae discontinuous, with distinct gaps in the line; aedeagus with parameres broadly rounded and parallel sided at apex, not tapering (Fig. 6G).................................................... O. bellus sp. n.
4(1’) Posterolateral corners of pronotum broadly rounded (e.g. Figs. 1A–C).......................................... 19
- Posterolateral corners of pronotum angulate or spinose (e.g. Figs. 2A–B, 3A–B)................................... 5
5(4’) Posterolateral corners of pronotum angulate but not prolonged into an acute spine (e.g. Fig. 3A)....................... 6
- Posterolateral corners of pronotum spinose (Figs. 3B, 2A–B).................................................. 10
6(5) Abdominal ventrites uniformly pale yellow................................................................. 7
- Abdominal ventrites darkly colored, at least in part........................................................... 8
7(6) First row of elytra punctures formed by an irregular line of very coarse punctures, not bearing erect setae........ O. galbus
- First row of elytra punctures forming a dense, continuous line bearing erect setae........................... O. luteus
8(6’) First row of elytra punctures with row of erect setae along at least half of its length................................. 9
- First row of elytra punctures not bearing long setae along its length....................................... O. pittieri
9(8) First row of elytra punctures bearing dense and continuous row of erect setae......................... O. pakcha sp. n.
- First row of elytra punctures bearing an irregular, broken row of erect setae (Fig. 3A)................. O. radiatus sp. n.
10(4’) Abdominal ventrites uniformly pale (Fig. 3B); size very large (> 5.2 mm)........................... O. ustulatus sp. n.
- Abdominal ventrites dark brown, at most with paler or orange spots laterally (e.g. Figs. 2A–B); size variable (3.2–5.5 mm).. .................................................................................................. 11
11(10’) First row of systematic punctures bearing a more or less continuous like of erect setae (the line may have small breaks but these are short); size large (> 4.2 mm)......................................................................... 16
- First row of systematic punctures at most bearing a few small clumps or erect setae along its length or occasionally without any distinct line or clups of erect setae; size usually smaller, rarely greater than 4.0 mm (except O. zamora: 4.1–4.4 mm)..... 12
12(11’) Elytra without clumps of erect setae................................................................. O. pico
- Elytra bearing clumps of erect setae, at least mesally near the elytra suture (e.g. Figs. 2A–B, 4B)..................... 13
13(12’) Aedeaegus with parameres strongly narrowing in apical half (Figs. 6D–E); rows of elytra systematic punctures distinct from ground punctation; elytra with blue maculae (Figs. 2A–B)................................................... 14
- Aedeaegus with parameres not narrowing in apical half, sometimes even appearing to swell towards apex (Figs. 6H–J); rows of systematic punctures not distinct; elytra without blue maculae............................................... 15
14(13) First row of elytra systematic punctures represented by a short linear tuft of erect setae anteriorly, then the remainder of the row bearing sparse usually decumbant setae (Fig. 2B); anterolateral pale spot larger........................ O. sumak sp. n.
- First row of elytra systematic punctures represented by a line of tufts and erect setae along its entire length (Fig. 2A); anterolateral pale spot smaller.......................................................................... O. ankas sp. n.
15(13’) Elytral ground punctation bearing short scattered setae; size larger (4.1–4.4 mm), ground punctation coarser (Fig. 1B)............................................................................................ O. zamora sp. n.
- Elytral ground punctation not bearing setae; size smaller (3.1–4.1 mm), ground punctation finer (Fig. 4B)........................................................................................ O. morgani / trujillo species group
16(11) First row of elytral systematic punctures continuous, without short breaks. Lateral rows of elytral systematic punctures much coarser than surrounding ground punctation, making them easy to discern....................................... 18
- First row of elytral systematic punctures not continuous, interrupted by short breaks. Lateral rows of elytral systematic punctures similar in size to surrounding ground punctation, making them difficult to discern................................. 17
17(16’) Lateral rows of elytra systematic punctures coarser than surrounding punctures............................. O. maluz
- Lateral rows of elytra systematic punctures similar in size to surrounding ground punctation, making them difficult to discern.......................................................................................... O. andinus
18(16) Aedeagus with parameres inwardly curved at apex, not sinuate along outer margin. Elytral margins distinctly explanate in posterior third. Dorsal ground punctation on pronotum and elytra fine but distinct....................... O. meridensis
- Aedeagus with parameres slightly inwardly curved at apex, sinuate along outer margin. Elytral margins not to very weakly explanate in posterior third. Dorsal ground punctation on pronotum and elytra very fine; present but appearing nearly effaced......................................................................................... O. substillus
19(4) Mesoventral process set with thin hairs. Elytra bearing dense setae from ground punctures.......................... 20
- Mesoventral process set with thickened spines. Elytra at most with setae arising in rows............................ 21
20(19) Anterolateral corners of pronotum with pale spot.............................................. O. rupestris sp. n.
- Anterolateral corners of pronotum without pale spot................................................... O. sharpi
21(19’) Anterolateral corners of pronotum with pale spot (e.g. Fig. 1C); prosternal process with or without a pair of spines anteriorly. .................................................................................................. 22
- Anterolateral corners pronotum without pale spot (e.g. Fig. 1B); prosternal process not set with a pair of spines anteriorly... .................................................................................................. 23
22(21) Prosternal process set with two spines anteriorly................................................... O. maculatus Prosternal process without spines........................................................... O. yantzaza sp. n.
23(21’)Aedeagus with narrow median lobe (Figs. 5E–F)............................................... O. kichwa sp. n.
- Aedeagus with broad median lobe (Fig. 5H).................................................... O. ancho sp. n.
description: Published as part of Short, Andrew E. Z., Torres-Gavosto, Juan Martin & Hettinger, Ty, 2023, A review of the Oocyclus Sharp of Ecuador with description of 12 new species (Coleoptera: Hydrophilidae: Laccobiini), pp. 91-112 in Zootaxa 5277 (1) on pages 92-93, DOI: 10.11646/zootaxa.5277.1.4, http://zenodo.org/record/7892052