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Zambion rogeri can be distinguished from all other Zambion spp. by having tergites 3 to 7 of metasoma black with ivory bands in posterior 0.1 to 0.2 (Fig. 6). No other species have banded metasomal segments.
Adult. Female: Unknown.
Male: Fore wing length 6.4 to 7.0 (6.4) mm. Clypeus separated from supraclypeal area by a strong groove (Fig. 12). Malar space 0.4 to 0.5 (0.5) times basal width of mandible. Supraclypeal area 1.7 to 1.9 (1.7) times as wide as high (Fig. 12), dorsomedially without a short, narrow, longitudinal lamella between the antenna. Supra-antennal horn short and broadly triangular in dorsal view (Fig. 18), 0.3 to 0.5 (0.3) times as long as width of pedicel at midheight in lateral view. Ocello-ocular distance 1.8 to 2.3 (1.8) times ocellar diameter. Gena 0.6 to 0.7 (0.6) times transverse diameter of the eye. Flagellum with 35 to 37 (35) segments.
Notaulus absent. Epicnemial carina mostly straight medially, not curving away from anterior edge of mesopleuron near ventral corner of pronotum (Fig. 32). Scutellum with lateral carinae 0.4 to 0.5 (0.5) length of scutellum. Medial longitudinal carinae of propodeum complete and strong anterior to posterior transverse carina (as in Zambion hirtum shown in Fig. 34). Carina extending from pleural carina to propodeal spiracle absent. Posterior transverse carina of propodeum with lateral abscissa roughly straight, point of union with pleural carina at about 0.4 distance from posterior end of pleural carina to propodeal spiracle (similar to Zambion monodon shown in Fig. 36). Ventral transverse carina extending from metasomal foramen to pleural carina present (as in Fig. 35). Fore tibia with a weak apical point on dorsal surface. Hind femur 3.5 to 3.7 (3.6) times as long as medial width. Hind tarsal claw pectinate to 0.4 times length of claw. Angulation of fore wing vein 2m-cu moderate.
Tergite 1 of metasoma 1.6 to 1.8 (1.6) times as long as apical width. Dorsal longitudinal carinae of T1 extending to about the level of spiracle or a bit beyond, 0.4 to 0.6 (0.6) times length of T1, dorsolateral longitudinal carinae extending to spiracle, or in holotype to at least 0.7 times length of T1 (posterior to this, present as a rounded ridge).
Black to dark brown. Extreme apex of hind femur, basal 0.2 of hind tibia and posterior 0.2+ of T3–T7 ivory (the ivory bands longer medially than laterally and increasing in length from T3 to T7) (Fig. 6). Scape, pedicel and flagellum ventrally, mandibles except at apex, palpi, pronotal collar medially, tegula, posterior of subtegular ridge, fore leg, mid leg, hind coxa, trochanter and femur orange (middle and hind trochanters and femora brownish orange, especially medial surface of hind trochanter and femur). Flagellum dorsally, apical 0.8 of hind tibia and all of hind tarsus brown (flagellum darkening from base to apex). Membrane of fore wing slightly infumate except moderately infumate in apical 0.3 (Fig. 6). Body covered with dense silver setae.
Holotype: ♂, Label 1: BRIT, E, AFRICA [KENYA], Masai Reserve, 29.i.1914, Cap. A.O.Luckman. Label 2: 1919-10. [NHM]. Condition: intact except left antennal flagellum missing all but basal 24 flagellomeres. Paratypes: ♂, BRIT. E. AFRICA [KENYA], 30 miles from Magadi Junc., iv.1912. F.G. Hamilton [NHM]; ♂, BRIT. E. AFRICA [KENYA], Mogorr River, v.1913 [CNC].
This species is named in honour of the senior author’s father, Dr. Roger Bennett, for his support and encouragement during the long (and sometimes dark) journey towards becoming a systematic entomologist.
Zambion rogeri is most closely related to Zambion eileenae on the basis of the similar short triangular horn of the supra-antennal area and the length of the longitudinal carinae of T1. Even though Zambion rogeri is only known from males, and Zambion eileenae from a single female, it is highly unlikely that they are conspecific. Zambion rogeri has extensive yellow colouration on the legs and ivory bands on the metasoma, whereas Zambion eileenae is completely dark. In the three species of Zambion for which both males and females are known, there are minimal sex-related colour differences and this is also the case for species in the related genera Ibornia (Seyrig 1935) and Thibetoides (Kasparyan 1973). In addition, the malar space of Zambion rogeri is 0.4 to 0.5 times the basal width of the mandible compared to 0.7 for Zambion eileenae. Zambion rogeri also lacks the carina extending from the pleural carina to the propodeal spiracle, whereas this carina is complete in Zambion eileenae.
- Bennett, A; Barnes, D; 2011: Revision of the world species of Zambion (Hymenoptera, Ichneumonidae, Tryphoninae) ZooKeys, 159: 19-48. doi
- Seyrig A (1935) Mission scientifique de l’Omo. Tome III. Fascicule 18. Hymenoptera, II. Ichneumonidae: Cryptinae, Pimplinae, Tryphoninae et Ophioninae. Mémoires du Muséum National d’Histoire Naturelle, Paris, 4: 1-100.
- Kasparyan D (1973) Fauna of the USSR Hymenoptera Vol III Number 1. Ichneumonidae (Subfamily Tryphoninae) Tribe Tryphonini. Nauka Publishers, Leningrad. [Translated from Russian. Amerind Publishing Co. Ltd., New Delhi, 1981, 414 pp.]