Oosagitta minuta (Laboissière. 1937) Kortenhaus & Wagner, 2013

Kortenhaus, Sabine & Wagner, Thomas, 2013, Oosagitta gen. nov. from tropical Africa, with revision of two species and description of four new species (Coleoptera: Chrysomelidae, Galerucinae), European Journal of Taxonomy 58, pp. 1-24 : 10-13

publication ID	https://doi.org/ 10.5852/ejt.2013.58
publication LSID	lsid:zoobank.org:pub:F3F3995B-7009-467F-99C1-43ED56039BFA
DOI	https://doi.org/10.5281/zenodo.3843795
persistent identifier	https://treatment.plazi.org/id/03A287A2-2101-FF8B-FE6C-C17C641EF9B1
treatment provided by	Carolina
scientific name	Oosagitta minuta (Laboissière. 1937)
status	comb. nov.

Treatment

Oosagitta minuta (Laboissière. 1937) comb. nov.

Figs 10-14 View Figs 10-12 View Fig View Fig

Ergana minuta Laboissière, 1937: 151-152 .

Differential diagnosis

Oosagitta minuta comb. nov. is the smallest species of the genus with a total body length between 3.10 and 4.20 mm. There is no other specimen of the other five species of such small size known. Antennae of O. minuta comb. nov. are shorter than those of the other described species: mean antennal length to total body length is 0.56–0.65 (other species 0.75–1.00). Also the coloration differs strongly from the other species, since O. minuta comb. nov. has dark brown elytron, while all other species show yellowish to yellowish-brown elytron throughout or yellow with brownish base and apex ( O. geescheae sp. nov.).

Type material

Lectotype

♂, “ Uganda, Busso Busoga , May 1909, Dr. E. Bayon /Mus. Civ. Genova/Type male/Ergana minuta, m, V. Laboissière m. V. Laboissière – Det./AfriGa specimen ID 885, 17.IV.2004 ” ( MCGD). A lectotype is herein designated to fix the name on a single specimen. ( Fig. 14 View Fig ).

Paralectotype

1 ♂, same data as lectotype, additionally “Le Moult vend. via Reinbek, Eing. Nr. 1, 1957” ( ZMUH).

Type locality

UGANDA: Bussoga, -0.23/30.11.

Other material examined

DEMOCRATIC REPUBLIC OF THE CONGO: 2 exx., Parc Nat. de la Upemba, affl. Lusinga (1585 m), 0.733/28.62, Dec. 1947, Miss. G.F. de Witte ( IRSNB); 5 exx., Parc Nat. de la Upemba, Lusinga (1760 m), 0.167/26.30, Dec. 1947, Miss. G.F. de Witte ( IRSNB); 2 exx., Parc Nat. de la Upemba, Mabwe (r. E. lac Upemba), 585 m, -8.65/26.52, Dec. 1948, Miss. G.F. de Witte ( MRAC).

SOUTH AFRICA: 1 ex., Natal, Malvern, C.I.E. Coll. No. 15946, G.E. Bryant det.: Ergana proteus ( BMNH); 1 ex., Südafrika: Transvaal, lekgalameetse Nat. Res., -24.08/30.25, Dec. 1995, F. Koch ( MNHU).

Redescription

MEASUREMENTS. n = 12, total length 3.10–4.20 mm (mean 3.75 mm; Fig. 10 View Figs 10-12 ), maximum height in lateral view 1.30–1.50 mm (mean 1.40 mm).

HEAD. Yellowish to brown, mandibles dark brown. Maximum width of eye to minimum distance between eyes 0.55–0.78 (mean 0.68). Length of second to third antennomere 0.5–0.75 (mean 0.64), length third to fourth antennomere 0.67–0.89 (mean 0.78; Fig. 11 View Figs 10-12 ). Basal antennomeres yellowish, antennae becoming darker towards the apex. Mean antennal length to total body length ratio 0.60.

THORAX. Pronotum yellowish with very delicate punctation. Pronotal width 1.00– 1.50 mm (mean 1.28 mm), length of pronotum 0.65–0.95 mm (mean 0.81 mm), pronotal width to length 1.41–1.77 (mean 1.57). Elytron dark brown, irregular punctation, coarser than pronotum. Elytral length 2.35– 3.25 mm (mean 2.82 mm), maximum width of both elytra combined 1.80–2.60 mm (mean 2.23 mm), ratio of maximum width of elytra combined to length of elytron 0.73–0.88 (mean 0.79). Pro-, meso- and metathorax, abdomen and legs dark brown, coxae and distal/proximal parts of tarsomeres yellowish or light brown. Tibia has all around setae and is gently curved. Length of basimetatarsus to length of metatibia 0.25–0.35 (mean 0.30).

MALE GENITALIA. The symmetric median lobe tapers and is down-curved in lateral view. The tectum is shorter than median lobe and nearly triangular ( Fig. 12A View Figs 10-12 ). Tectorial spures are very slender, the basal two thirds covered by the tectum, the apices very fine and dorsally hooked ( Fig. 12A, C View Figs 10-12 ). Endophallus with broad base fine “arrow-hooks” ( Fig. 12A, B View Figs 10-12 ). Basal orifice of median lobe ovoid with an incision ( Fig. 12A View Figs 10-12 ).

Distribution

Known from southern Uganda, southeastern Congo and from the northern states of South Africa ( Fig. 13 View Fig ).