Chimarra pedaliotus, Blahnik & Andersen, 2022

Blahnik, Roger & Andersen, Trond, 2022, New species of the genus Chimarra Stephens from Africa (Trichoptera, Philopotamidae) and characterization of the African groups and subgroups of the genus, ZooKeys 1111, pp. 43-198 : 43

Chimarra pedaliotus sp. nov.

Fig. 19A-G

Type material.

Holotype. Ghana - Volta Reg. ● ♂ (in alcohol); Wli, Agumatsa waterfall, station # 12; 7°07'29"N, 0°35'31"E; 7 Mar. 1993; JS Amakye & J Kjærandsen leg.; light trap; UMSP 000550008. Paratypes. Ghana - Volta Reg. ● 1♂; same data as for holotype except station # 10A; 7-10 Mar. 1993; Malaise trap; ZMBN ● 1♂; same data as for holotype except station # 3; 10 Mar. 1993; light trap; ZMBN ● 4♂♂; same data as for holotype except 17 Nov. 1993; J Kjærandsen leg.; ZMBN ● 2♂♂; same data as for holotype except station # 6; 11 Mar. 1993; ZMBN ● 1♂; same data as for holotype except 20 Nov. 1993; J Kjærandsen leg.; ZMBN ● 1♂; same data as for holotype except station # 10; 8 Mar. 1993; ZMBN ● 1♂; same data as for holotype except station # 3; 12 Nov. 1993; J Kjærandsen leg.; sweep net; ZMBN. - Eastern Reg. ● 1♂; Boti Falls; 6°11'40"N, 0°13'05"W; 19 Nov. 1991; J Amakye leg.; light trap; ZMBN ● 1♂; Kibi, Subri stream; 6°10'N, 0°33'W; 5 Nov. 1993; J Kjærandsen leg.; light trap; ZMBN. Cameroon ● 20♂♂1♀; Muguka, Victoria Division; 24-29 June 1949; B Malkin leg.; INHS ● 2♂♂; same collection data as for preceding; UMSP ● 1♂; Victoria, British Cameroons; May 1949; B Malkin leg.; INHS. NIGERIA ● 1♂; Cross River State, Ikom, Igoja Prov.; 6 Jan. 1949; B Malkin leg.; INHS.

Additional material.

Ghana - Eastern Reg. ● 2♀♀; Boti Falls ; 6°11'40"N, 0°13'05"W; 19 Nov. 1991; JS Amakye leg. ; light trap; ZMBN ● 1♀; same collection data as for preceding except 28 Oct.-4 Nov. 1994; T Andersen leg. ; Malaise trap; ZMBN ● 8♀♀; Kibi, Subri stream; 6°10'N, 0°33'W; 5 Nov. 1993; J Kjærandsen leg. ; light trap; ZMBN. - Volta Reg. ● 2♀♀; Hohoe, Matvin Hotel ; 7°09'43"N, 0°28'31"E; 11 Nov. 1993; J Kjærandsen leg. ; at light; ZMBN ● 1♂; Fodoma, Nubui stream; 7 June 1995; T Andersen & J Kjærandsen leg. ; light trap; UMSP ● 1♀; Wli, Agumatsa waterfall, station # 3B; 7°07'29"N, 0°35'31"E; 4-7 Mar. 1993; JS Amakye & J Kjærandsen leg. ; Malaise trap; ZMBN ● 1♀; same collection data as for preceding except station # 9B; UMSP ● 1♀; same collection data as for preceding except station # 4B; 7-10 Mar. 1993 ; ZMBN ● 5♀♀; same collection data as for preceding except station # 3; 10 Mar. 1993 ; light trap; ZMBN ● 6♀♀; same collection data as for preceding except 17 Nov. 1993; J Kjærandsen leg. ; ZMBN ● 1♀; same collection data as for preceding except station # 6; 11 Mar. 1993; JS Amakye & J Kjærandsen leg. ; ZMBN ● 2 ♀♀; same collection data as for preceding except 20.xi.1993; J Kjærandsen leg. ; ZMBN ● 12♀♀; same collection data as for preceding except station # 10; 19 Nov. 1993 ; ZMBN ● 30♀♀; same collection data as for preceding except station # 12; 16 Nov. 1993 ; ZMBN.

Diagnosis.

Inferior appendage relatively short, uniform in width in lateral view, apex subacute in ventral view; ventral apex of phallobase expanded, laterally compressed, and ventrally deflexed; phallus with pair of small, curved, symmetrically placed spines; apex of lateral lobe of tergum X subacute.

Chimarra pedaliotus is similar to C. occidentalis Gibon but is easily diagnosed by the very distinctive apex of the phallobase, which is enlarged and rounded, as viewed laterally, and also strongly compressed. Specimens from Cameroon differed slightly in the armature of the phallus, including phallic spines that tended to be bifid apically and were also somewhat larger, and a more elongate apical spine. The differences are rather minor and somewhat variable even in the material examined; on the other hand, the overall similarity is significant. We do not consider the differences significant enough to warrant varietal or species status. Future collecting may require a reassessment of this conclusion.

Description.

Adult. Overall color (in alcohol) yellowish brown. Head short and rounded (length of postocular parietal sclerite ~ 1/2 diameter of eye). Palps relatively short, maxillary palp with 1st segment very short (length subequal to width), 2nd segment relatively short (~ 3 × 1st), apex with small cluster of stiff setae, 3rd segment slightly longer than 2nd, 4th segment short (~ 1/2 length of 3rd), 5th segment short (subequal to 2nd). Forewing length: male, 3.8-5.0 mm; female, 4.5-5.5 mm. Fore- and hind wings with forks I, II, III, and V present. Forewing with R1 somewhat sinuous, stem of Rs weakly inflected at approximately midlength, with node at inflection, extending into cell below, basal fork of discoidal cell enlarged, fork very asymmetric, length of cell ~ 2 × width, forks I and II slightly subsessile, r crossvein diagonal, intersecting discoidal cell at past midlength, just before fork I, m crossvein proximal to s and r-m crossveins, approximately midway between basal fork of M and r-m crossvein, s pigmented (like wing), r-m and m crossveins hyaline and very faint, 2A with crossvein (apparently forked apically to 1A and 3A). Hind wing with R1 narrowly parallel to subcosta, forks I and II slightly subsessile. Foreleg with apical tibial spur short; male with foretarsi modified, claws enlarged, outer claw twisted and asymmetric.

Male genitalia. Segment VIII moderately elongate, sternum and tergum subequal in length. Segment IX, in lateral view, elongate, anterior margin strongly, subangularly produced in ventral 1/3, dorsolaterally with distinct rounded apodeme, margin strongly convex between; tergum, in dorsal view, continuous between apodemes, but very short, forming deeply concave excavation; posterior margin nearly linear, slightly widening ventrally; ventral margin with rather prominent, posteriorly projecting, ventral process, length greater than width at base, apex subacute. Segment IX, in dorsal or ventral views, with anteroventral margin deeply concave mesally. Lateral lobes of tergum X relatively short, subacute apically, with moderately elongate, posteriorly projecting, digitate, sensilla-bearing process near dorsal margin in basal half; mesal lobe of tergum X membranous, ~ 1/2 length of lateral lobes. Preanal appendages short, rounded, constricted basally. Inferior appendage, in lateral view, only moderately elongate, nearly uniform in width, dorsally flexed near base, with small angular ventral projection at point of inflection, apex incurved and forming short, rounded projection, not visible in lateral view; appendage, in dorsal or ventral views, uniformly and only moderately mesally curved. Phallic apparatus with phallobase tubular, with usual basodorsal expansion, dorsal margin tapering and acute apically, but only weakly sclerotized, apicoventral margin forming a broadly rounded and deflexed, laterally compressed and keel-like, sclerotized projection; endotheca relatively short and without minute spines, basally with pair of short, curved, symmetrical, laterally emergent spines; phallotremal sclerite complex composed of moderately elongate rod and ring structure, with narrow, paired, dorsolateral sclerites.

Etymology.

Chimarra pedaliotus , as an adjective from the Greek pedaliotos, meaning "with a rudder," and referring to the keeled and somewhat rudder-like ventral apex of the phallobase in this species.

Figures

Figure 19. Chimarra pedaliotus sp. nov., ♂ genitalia A lateral B dorsal, segments IX and X C inferior appendage, ventral D inferior appendage, dorsal E phallus, lateral F phallus, dorsal G phallic armature, dorsal, variant from Cameroon.