Oosagitta thomasi, 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 : 18-20

Oosagitta thomasi sp. nov.

urn:lsid:zoobank.org:act:61E0C9B7-DF5B-42C8-B5F9-479A1FE11E20

Figs 8 , 23-26

Differential diagnosis

With regard to elytral coloration, O. thomasi sp. nov. differs from O. geescheae sp. nov. (with basal and apical pattern) and O. minuta comb. nov. (dark brown elytron). The basal antennomere is yellowish and all following ones are brown, while O. angolensis comb. nov. has completely brown antennae and O. anningae sp. nov and O. melanopicta sp. nov. have yellowish antennae. Only O. minuta comb. nov. has a similar antennal coloration, but is significant smaller. Clear differentiation is given by the shape of median lobe: the tectorial spures are nearly as long as tectum ( Figs 25A, 25B ), while O. angolensis comb. nov. has a longer, more curved tectum ( Fig. 7C ). Tectum of O. geescheae sp. nov. is spatulate ( Fig. 21A ) and O. melanoptica sp. nov. has longer, more slender and crossed tectorial spures ( Fig. 29B ). Median lobes of O. minuta comb. nov. ( Fig. 12A ) and O. anningae sp. nov. ( Fig. 17A ) are clearly different.

Etymology

Named after Sabine Kortenhaus’ husband Thomas.

Type material

Holotype

♂, “Coll. Mus. Tervuren, Nigeria: Jos, X/ XII. 1965, E. Bot Gwong /AfriGa specimen ID 1899, 15.III. 2012” ( MRAC) ( Fig. 26 ).

Paratypes

NIGERIA: 1 ♂, 2 ♀♀, same data as holotype.

BURUNDI: 1 ♂, Urundi: Bururi, -3.95/29.69, R.P. Giraudin, ex coll. Breuning ( MRAC). DEMOCRATIC REPUBLIC OF THE CONGO: 1 ♂, I.R.S.A.C., Kivu, Kavimvira [Karimviza], -3.35/29.16 (Uviva), Jan. 1956, G. Marlier ( MRAC).

Type locality

NIGERIA: Jos, 9.92/8.09.

Description

MEASUREMENTS. n = 6, total length 4.65–5.50 mm (mean 5.12 mm; Fig. 23 ); maximum height in lateral view 1.85–2.20 mm (mean 2.02 mm).

HEAD. Yellowish. Maximum width of eye to minimum distance between eyes 0.61–0.75 (mean 0.67). Maxillary palps and mandibles brown. Length of second to third antennomere 0.55–0.62 (mean 0.59), length third to fourth antennomere 0.69–0.79 (mean 0.75; Fig. 24 ). Basal antennal article yellowish, following antennomeres brown. Antennal length to total body length 0.75–0.82 (mean 0.78).

THORAX. Yellowish like head, pronotum and disc of elytron. Pronotum with very delicate punctation. Pronotal width 1.50–1.80 mm (mean 1.65 mm), length of pronotum 0.95–1.10 mm (mean 1.06 mm), pronotal width to length 1.50–1.63 (mean 1.56). The yellowish elytron has an irregular coarse punctation. Elytral length 3.90–4.40 mm (mean 4.13 mm), maximum width of both elytra combined 2.60–3.30 mm (mean 2.97 mm), ratio of maximum width of elytra combined to length of elytron 0.66–0.80 (mean 0.72). Pro-, meso- and metathorax, abdomen yellowish. Legs yellowish, only basal part of tibia and tarsi brownish. Length of basimetatarsus to length of metatibia 0.30–0.33 (mean 0.31).

MALE GENITALIA. Median lobe broad, conical in the apical quarter, strongly curved ventrally ( Fig. 25A, B ), apex with shortly curved tip ( Fig. 25B ). Tectum short, very broad at base, aoical half very narrow reduces to an elongated, ventrally bent, apical point. It has comparatively short, slender tectorial spures, which are nearly as long as the tectum ( Figs 25B ). Endophallus brush is emerging from a very broad, arrow-like structure ( Fig. 25 ).Orifice of median lobe ovoid with a great incision ( Fig. 25A ).

Distribution

Nigeria, Congo Basin, Burundi ( Fig. 8 ).

Figures

Fig. 8. Distribution of O. angolensis comb. nov., O. melanopicta sp. nov. and O. thomasi sp. nov.

Figs 23-25. Oosagitta thomasi sp. nov. 23. Habitus, semi-schematic dorsal view. 24. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 25. Median lobe. A. Dorsal. B. Lateral. Scale bars: 1 mm.

Fig. 26. Holotype of O. thomasi sp. nov. A. Overview with labels. B. Close-up of specimen.

Figs 5-7. Oosagitta angolensis comb. nov. 5. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 6. Spermathecae of 3 ♀♀. 7. Median lobe: A. Dorsal. B. Detail: apex of endophallus. C. Lateral. Scale bars = 1 mm.

Figs 19-21. Oosagitta geescheae sp. nov. 19. Habitus, semi-schematic dorsal view. 20. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 21. Median lobe. A. Dorsal. B. Lateral. Scale bars: 1 mm.

Figs 27-29. Oosagitta melanopicta sp. nov. 27. Habitus, semi-schematic dorsal view. 28. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 29. Median lobe. A. Dorsal. B. Lateral. Scale bars: 1 mm.

Figs 10-12. Oosagitta minuta comb. nov. 10. Habitus, semi-schematic dorsal view. 11. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 12. Median lobe: A. Dorsal. B. Detail: apex of endophallus. C. Lateral. Scale bars = 1 mm.

Figs 15-17. O. anningae sp. nov. 15. Habitus, semi-schematic dorsal view. 16. Basal four antennomeres of 2 ♂♂ and 2 ♀♀. 17. Median lobe. A. Dorsal. B. Detail: apex of endophallus. C. Lateral. Scale bars: 1 mm.