Ozeoura, Theischinger & Billingham & Growns, 2018

Theischinger, Gunther, Billingham, Zacariah D. & Growns, Ivor, 2018, Ozeoura-a New Genus of Chioneinae (Insecta: Diptera: Tipuloidea: Limoniidae) from Australia, Records of the Australian Museum (Rec. Aust. Mus.) 70 (5), pp. 447-468 : 450

publication ID	https://doi.org/ 10.3853/j.2201-4349.70.2018.1714
publication LSID	lsid:zoobank.org:pub:FF083CDE-BA28-458F-90CE-5A11539FDA3F
persistent identifier	https://treatment.plazi.org/id/2D1287B1-B743-1E2B-1A57-FEFEDA22FF8E
treatment provided by	Carolina
scientific name	Ozeoura
status	gen. nov.

Treatment

Ozeoura View in CoL g. nov.

Theischinger & Billingham

Figs 4 View Figure 4 , 5 View Figures 5–8 , 9 View Figures 9–14 , 15–50 View Figures 15–19 View Figures 20–22 View Figures 23, 24 View Figures 25, 26 View Figures 27, 28 View Figures 29, 30 View Figures 31–33 View Figures 34, 35 View Figures 36, 37 View Figures 38–50

Type species: Ozeoura billeang Theischinger & Billingham View in CoL sp. nov.

Diagnosis. Tiny (wing 3.5–5.0 mm) limoniid tipuloids. Head with rostrum short, antenna 16-segmented. Thorax short and narrow, with V-shaped thoracic suture developed; no tibial spurs, claws simple. Wings of normal size. Wing venation, with the terms in brackets referring to the system used in the recent Afrotropical Manual, based on Wootton & Ennos (1989) and Saigusa (2006) ( Fig. 5 View Figures 5–8 ): Rs markedly longer than R2+3+4, originating at, to slightly beyond, midway between levels of humeral crossvein and R2 (well before level of Sc2), and running in direct and straight alignment with vein R5; R2+3 almost straight, markedly shorter than R2+3+4 which is distinctly curved and also markedly longer than r-m; dm open; CuA2 (CuA), A1 (CuP) and A2 (A1) almost straight. Male terminalia ( Fig. 9 View Figures 9–14 ) with at least the phallosomic parts withdrawn into the body; base of gonocoxites not covered by epandrium, cerci and hypoproct jutting out freely (8 of 9 species) or covered (1 of 9 species); gonocoxites very short (8 of 9 species) or moderately long (1 of 9 species), ventrally completely fused only in 1 of 9 species; one pair of gonostyli, simple to complex, terminal; aedeagal guide prominent between gonostyli and strongly sclerotized; aedeagus strongly convoluted. Female terminalia: ovipositor with valves short and fleshy, very small and blunt.

Etymology. The generic name refers to the known distribution of the new genus which is considered to be possibly restricted to Australia (Oz) and the morphologic similarity to Baeoura . Gender feminine.

Discussion. Ozeoura g. nov. is similar to both Baeoura and Cryptolabis . It can be distinguished from the type species of both these genera by having Rs in direct and straight alignment with vein R5 ( Fig. 5 View Figures 5–8 ) versus Rs ending in cell R4 ( Baeoura , Fig. 6 View Figures 5–8 ) or aligned with R5 at a distinct angle ( Cryptolabis , Figs 7, 8 View Figures 5–8 ). Rs is long (originating well before Sc2), and CuA2 (CuA) is at the most evenly and widely curved (almost straight) in Ozeoura ( Fig. 5 View Figures 5–8 ) versus Rs short (originating well beyond level of Sc2) and CuA2 (CuA) distinctly bowed at bt CuA1 (m-cu) in Cryptolabis (Cryptolabis) paradoxa ( Fig. 7 View Figures 5–8 ) and Cryptolabis (Procryptolabis) argentinensis (similar to Fig. 8 View Figures 5–8 ). Ozeoura has only one pair of terminal gonostyli ( Fig. 9 View Figures 9–14 ) versus subterminal gonostyli ( Fig. 10 View Figures 9–14 ) in Baeoura nigrolateralis and two pairs of gonostyli in Cryptolabis (Procryptolabis) ( Fig. 14 View Figures 9–14 ). Ozeoura generally has the base of the gonocoxites not covered by the epandrium ( Fig. 9 View Figures 9–14 ) versus covered in Baeoura nigrolateralis ( Fig. 10 View Figures 9–14 ), Cryptolabis (Cryptolabis) paradoxa ( Figs 11–13 View Figures 9–14 ) and Cryptolabis (Procryptolabis) ( Alexander, 1929) . This means cerci and hypoproct jut out freely in eight of nine species of Ozeoura . Only in Ozeoura the aedegus is strongly convoluted versus simply or at most sinuously curved. Future detailed studies may show that some of the numerous species placed in Cryptolabis belong elsewhere. Some may be found to be closer to Ozeoura than to C. paradoxa and even belong in Ozeoura which is at the present considered Australian versus the New World (mainly Neotropical) in Cryptolabis and almost exclusively Old-World in Baeoura .

Phylogenetic position of Ozeoura g. nov. Using larval and pupal morphology Oosterbroek & Theowald (1991) have Baeoura , Cryptolabis , Cladura Osten Sacken, 1860 and Chionea Dalman, 1816 as basal monophyletic group, next to the Chioneinae . They discuss the following characters:

Character 36: “Last larval segment constricted” is given as a synapomorphy for the Eriopterinae . Also found in Ozeoura (see under larva below: “terminal abdominal segment constricted at base, considerably narrower than the preceding segment”).

Character 37: Pupal “sheaths of middle legs the shortest” is given as a synapomorphy for the Eriopterinae . Also found in Ozeoura (see under pupa below: “fore and hind leg sheaths noticeably longer than the mid leg sheath”).

Character 38: “Pupae without respiratory horns”. Also in Ozeoura (see under pupa below: “mesothorax smooth and lacking respiratory horns”).

Character 39: “Labral papilla”. Also found in Ozeoura (see under larva below: “cylindrical papillae”). This places Ozeoura (as can be expected) in the Baeoura-Chionea clade.

Characters 40 (“Last larval segment not constricted”), 41 (“Spiracular lobes absent”) and 48 (“Larvae with ventral creeping welts”) place Ozeoura outside the Cladura-Chionea clade.

In the large phylogenetic study of Petersen et al. (2010) Cladura and Chionea are given as a well-resolved sistergroup but Baeoura and Cryptolabis are not taken into account. Therefore, concerning the phylogenetic position of Ozeoura, Oosterbroek & Theowald (1991) is apparently the only reference paper.