Conochironomus sawngthai, Cranston, Peter S., 2016

Cranston, Peter S., 2016, Conochironomus (Diptera: Chironomidae) in Asia: new and redescribed species and vouchering issues, Zootaxa 4109 (3), pp. 315-331 : 320

Conochironomus sawngthai sp. n.

( Figs. 2 B; 3C, D)

urn:lsid:zoobank.org:act:9DDC953D-C263-4B0E-B072-5585845067EF

Type-material. Holotype: ♂, slide mounted, uncleared, in Euparal (by Reiss), at ZSM; THAILAND: Chang Mai, Zoo, 26.iii-5.iii.1990 (Malicky). Paratype: ♂ genitalia only, as holotype except 23–30.v.1990.

Description. MALE (n = 1–2).

Body apparently uniformly brown with poorly delimited thoracic vittae (specimen mounted uncleared, in Euparal). Tibiae slightly paler in distal third, tarsomeres missing. Mensural features as in Table 1 . Genitalia ( Figs. 2 B; 3C, D) as compared to C. neungthai sp. n. with more median anal tergite setae anterior to broad base of anal point, which is parallel sided and slightly spatulate apically. Superior volsella more compressed, parallelogramshaped, with slightly concave inner and posterior margins, microtrichia restricted to narrow medio-basal area, inner point with 2 strong setae at apex; digitiform bare projection arising near middle of volsella, curving medially and more strongly narrowed beyond posterior margin of volsella, projection longer, ending medial to apex of volsella. Median volsella not evident in any form. Inferior volsella extensively fused to medial margin of gonocoxite, with swollen free apex densely covered with thick, recurved, simple setae, none of them directed posteriorly. Gonostylus broader than in C. neungthai sp. n., tapering, with more but weaker inner creases ( Fig. 3 D), apex slightly bifid due to swollen base of subapical seta.

FEMALE, PUPA, LARVA unknown.

Etymology. Derived from the Thai words săwng and thai, meaning the ‘second’ Thai species. To be treated as noun in apposition for the purposes of nomenclature.

Remarks. The two slide mounted specimens comprise one damaged and incomplete adult male, and an isolated hypopygium on a second slide. On one tibia, likely that of a midleg, the comb has a central spur that is very short relative to that on the other comb. This species subtly differs from C. nuengthai sp. n. notably in the shape of the superior volsellae ( Fig. 3 C versus Fig. 3 A).

* from literature, including measurements from figures.

n/a: not available (not stated in description, or damaged)

Figures

FIGURE 2. Conochironomus spp., adult genitalia. A. C. nuengthai sp. n., Male, left side dorsal, right side ventral; B. C. sawngthai sp. n., Male, left side dorsal, right side ventral stylised; C. C. tobaterdecimus (Kikuchi & Sasa), Male, dorsal, and superior volsella, ventral (inset, detail); D. C. tobaterdecimus (Kikuchi & Sasa), Female genitalia, (partial, ventral).

FIGURE 3. Conochironomus spp., parts of male genitalia. A, C, E. Anal point and superior volsella; B, D, F Gonostylus. A, B. C. nuengthai sp. n.; C, D. C. sawngthai sp. n.; E, F. C. tobaterdecimus (Kikuchi & Sasa).

Tables

TABLE 1. Adult male measurements.

	n=	b.l.	w.l.	A.R.	sR	sR1	sR4+5	sq	ac
C. tobaterdecimus holotype (after Kikuchi & Sasa)*	1	6.5	2.8	2.6	n/a	n/a	n/a	8	0
C. tobaterdecimus (Singapore)	1–2	6.5–6.9	2.5–2.7	2.4	23–26	22–23	0–1	11	0
C. "togunagai" Karunakaran* (unavailable name)	?	3.2	2.8	2.5	n/a	n/a	n/a	n/a	n/a
E. effusus (Dutta et al.) *	9	3.5–4.0	1.8–2.0	2.6	32	28	22–24	10–12	2
C. neungthai sp.n.	1–2	6.0–6.2	2.8–2.9	n/a	27–33	23–27	17	6–9	0
C. sawngthai sp.n.	1	6	2.4	2.0	30	16	14	4	0
continued.