Oecetis McLachlan 1877
Creators: name: Johanson, Kjell Arne
name: Mary, Nathalie Jeanne
name: Sjöberg, Tin
name: Malm, Tobias
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Trichoptera
Leptoceridae
Oecetis

description: Key to New Caledonian Oecetis species, males   
 1 Tergum X divided into bilobed main branch and posterior spine (Figs 1, 21, 57); upper posterolateral process on each side of segment IX not exceeding tergum X posteriorly............................................................. 2   
 - Tergum X lacking posterior spine (Figs. 73-74); upper posterolateral process of segment IX exceeding tergum X posteriorly (Fig. 73) …….......................................................................  Oecetis flucta sp. nov.    
 2 Tergum X with posterior spine longer than main branch (Figs 21, 41, 46)......................................... 3   
 - Tergum X with posterior spine as long as (Figs 6, 16, 31, 88) or shorter than (Figs 1, 11, 26, 36, 83) main branch........ 10   
 3 Tergum X with posterior spine curved strongly ventrad (Figs 51, 57, 62).......................................... 4   
 - Tergum X with posterior spine almost straight (Fig. 21) or curved slightly ventrad (Figs 41, 46, 67, 78)................. 6   
 4 Superior appendages as long as main branch of tergum X (Fig. 57); posterior spine very long and more slender than coxopodites in lateral view (Fig. 57)..............................................................  Oecetis gracilis sp. nov.    
 - Superior appendages about half as long as main branch of tergum X (Figs 51, 62); posterior spine about as thick as or thicker than coxopodites in lateral view (Figs 51, 62)............................................................... 5   
 5 Coxopodites curving slightly ventrad in lateral view (Fig. 62); posterior spine uniformly curving along its length in lateral view (Fig. 62)........................................................................ …..  Oecetis rostra sp. nov.    
 - Coxopodites curving slightly dorsad in lateral view (Fig. 51); posterior spine curving strongly ventrad after mid-length in lateral view (Fig. 51).................................................................  Oecetis multidentata sp. nov.    
 6 Coxopodites exceeding posterior spine of tergum X posteriorly in lateral view (Fig. 21)............  Oecetis millei sp. nov.    
 - Coxopodites not exceeding posterior spine of tergum X posteriorly in lateral view (Figs 41, 46, 67, 78)................. 7   
 7 Main branch of tergum X thicker than posterior spine in lateral view (Fig. 46); coxopodites each with long branch directed dorsad (Fig. 46).............................................................. …..  Oecetis dorsospina sp. nov.    
 - Main branch of tergum X more slender than posterior spine in lateral view (Figs 41, 67, 78); coxopodites directed posterad (Fig. 41, 67, 78)........................................................................................... 8   
 8 Coxopodites curving ventrad along their length (Fig. 78)........................  Oecetis nouvellecaledonensis sp. nov.    
 - Coxopodites not curving ventrad along their length (Figs 41, 67)................................................ 9   
 9 Coxopodites each divided into three branches (Fig. 67); superior appendages almost as broad as long in dorsal view (Fig. 68); phallus with three sclerotized processes or spines (Fig. 71) …..............................  Oecetis triramosa sp. nov.    
 - Coxopodites simple, undivided (Fig. 41); superior appendages clearly longer than broad in dorsal view (Fig. 42); phallus with one sclerotized process or spine (Fig. 44).................................... …………......  Oecetis oxybelis sp. nov.    
 10 Tergum X with posterior spine as long as main branch (Figs 6, 16, 31, 88)....................................... 11   
 - Tergum X with posterior spine shorter than main branch (Figs 1, 11, 26, 36, 83)................................... 14   
 11 Coxopodites each with long, posteriorly curving, spine-like dorsal process (Fig. 88)...............  Oecetis ovata sp. nov.    
 - Coxopodites without long dorsal processes (Figs 6, 16, 31)................................................... 12   
 12 Coxopodites in lateral view each with rectangular basal half separated from slender distal half (Fig. 31)..................................................................................................  Oecetis rostrata sp. nov.    
 - Coxopodites in lateral view each with basal half not rectangular (Figs 6, 16)..................................... 13   
 13 Coxopodites in ventral view with wide and long mesal plates only at base (Fig. 18); in lateral view with narrow triangular upper posterolateral process of segment IX (Fig. 16).........................................  Oecetis loyolaensi sp. nov.    
 - Coxopodites in ventral view with wide and short mesal plates at mid-length (Fig. 8); in lateral view with wide triangular upper posterolateral process of segment IX (Fig. 6)..............................................  Oecetis ovula sp. nov.    
 14. Superior appendages long, exceeding rest of genitalia posteriorly and each with bifurcated apex in lateral view (Fig. 11).....................................................................................  Oecetis ramosa sp. nov.    
 - Superior appendages shorter than tergum X and each with rounded apex in lateral view (Figs 1, 26, 36, 83)............. 15   
 15. Coxopodites each with ventral branch at base (Figs 83, 85)................................  Oecetis variabilis sp. nov.    
 - Coxopodites without ventral branches at base (Figs 1, 26, 36)................................................. 16   
 16. Coxopodites in lateral view each with basal third more than 4 times taller than distal third (Fig. 1); main branch of tergum X curving slightly ventrad in lateral view (Fig. 1); phallus more than seven times longer than narrowest part in lateral view (Fig. 4)..............................................................................  Oecetis amphora sp. nov.    
 - Coxopodites in lateral view each with basal third less than 4 times taller than distal third (Figs 21, 36); main branch of tergum X straight in lateral view (Figs 26, 36); phallus less than four times longer than narrowest part in lateral view (Figs 29, 39) 17   
 17. Segment IX anterior margins in lateral view slightly convex (Fig. 26); acrotergite IX forming uniform punctate area (Fig. 27); superior appendages about 3 times longer than tall in lateral view (Fig. 26); distal part of each coxopodite angled slightly posterad in lateral view (Fig. 26).......................................................  Oecetis christinae sp. nov.    
 - Segment IX anterior margin in lateral view strongly convex (Fig. 36); acrotergite IX forming two separate punctate areas (Fig. 37); superior appendages about 1.5 times longer than tall in lateral view (Fig. 36); distal part of coxopodites curving slightly dorsad in lateral view (Fig. 36).......................................................... Oecetis alicae sp. nov.
description: Published as part of Johanson, Kjell Arne, Mary, Nathalie Jeanne, Sjöberg, Tin & Malm, Tobias, 2020, Eighteen new species of Oecetis McLachlan 1877 (Trichoptera, Leptoceridae) from New Caledonia, pp. 201-240 in Zootaxa 4809 (2) on pages 233-234, DOI: 10.11646/zootaxa.4809.2.1, http://zenodo.org/record/3934048