Cricotopus (Paratrichocladius) scaturigineus ( Makarchenko & Makarchenko, 2014 )

Namayandeh, Armin, Hudson, Patrick L., Bogan, Daniel L. & Hudson, John P., 2024, Chironomidae (Diptera: Insecta) of Alaska, USA, with descriptions of new species and a checklist, Zootaxa 5511 (1), pp. 1-95 : 31-32

Cricotopus (Paratrichocladius) scaturigineus ( Makarchenko & Makarchenko, 2014)

Fig. 5A–C

Material examined. 1 male, 6 pharate male/pupae and 1 pharate female/pupa, 5 larvae; USA, Alaska, Glacier Bay National Park and Preserve, East Alsek River , Upper site, Alsek River , 01.ix.2006, leg. NP staff; dep. UAM .

Diagnosis. The C. scaturigineus can be separated from related species based on the diagnosis of Makarchenko & Makarchenko (2014) with the following additions:Adult male AR 1.04–1.81; third palpomere with 9 long sensilla clavata in a close cluster. Adult female with AR 0.5; third palpomere with 9 long sensilla clavata in a close cluster; LR 1 0.69; pseudospurs absent; seminal capsules oval; apodeme lobe thin and small; cercus with long pediform extensions. Pupa 3.5–5.0 mm. Larva 4.1–5.9 mm; AR 1.3–1.8; premandible usually simple, sometimes with a notch appearing as double; mentum with short but developed basal extension; setae submenti posteriad, aligned with the 4 th lateral teeth of mentum, ventromental plates well-developed.

Pharate female (n = 1)

Total length 3.5 mm.

Coloration of mounted specimen. Head, thorax, abdomen, and legs dark brown. Halteres and wings greyish brown.

Head. Eyes hairy. Antenna with 6 flagellomeres, antennal segments length in μm: 54, 46, 49, 49, 56, 121; last segment with 10 sensilla chaetica ( Fig. 5A ), AR 0.5. Palpal segments lengths (in μm): 49, 61, 76, 71, 95; third palpomere with 9 sensilla clavata clustered.

Thorax. Acrostichals 8, dorsocentrals 8 in single row, prealars 4, antepronotal lobes with 3 setae. Humeral pit developed, with several small pits.

Wing. Squama with 12 setae.

Legs. Fore tibial spur 44 μm long, mid tibial spurs 28, 16 μm long, hind tibial spurs 65, 18 μm long, hind leg comb with around 19 spines. Lengths and proportions of legs as in Table 6.

Genitalia ( Fig. 5B–C ). Gonocoxite small and short with up to 8 setae. Seminal capsules oval ( Fig. 5B ), seminal capsule 97 μm long, 64 μm wide. Notum 199 μm long. Gonapophysis VIII divided into large ventrolateral lobe and dorsomesal lobe with oral projection ( Fig. 5B ). Ventrolateral lobes cover dorsomesal lobes in broad contact. Tergite IX appears not divided ( Fig. 5C ). Cercus with long pediform extensions ( Fig. 5c ), 139 μm long and 56 μm wide.

Remarks

C. scaturigineus was initially described as Paratrichocladius fontinalis by Makarchenko & Makarchenko (2014) from springs of the Amur River basin (Jewish Autonomous Region, Bidzhan River basin) by adults, pupa, and larva. Makarchenko & Makarchenko (2015a) found out that this species is a secondary homonym of Syncricotopus fontinalis Saether, 1969 , described from Canada. In 1990 S. fontinalis was transferred to the genus Paratrichocladius Santos-Abreu and synonymized with Paratrichocladius nitidus ( Malloch, 1915) ( Ashe & O’Connor, 2012; Oliver at al.1990). Therefore, they chose a new name for Paratrichocladius fontinalis , Paratrichocladius scaturigineus Makarchenko & Makarchenko, 2014 . Since Paratrichocladius has been synonymized with Cricotopus by Cranston & Krosch (2015), the name for the species is Cricotopus (Paratrichocladius) scaturigineus ( Makarchenko & Makarchenko, 2014) .

In this study, we described the female of this species for the first time based on a pharate specimen. The collected specimens of this species from Alsek River, Glacier Bay National Park and Preserve, Alaska, fall within the description given by Makarchenko & Makarchenko (2014) for this species.

Figures

FIGURE 5. Cricotopus (Paratrichocladius) scaturigineus (Makarchenko & Makarchenko, 2014) adult female (A–C). A. antenna, B. genitalia, ventral, C. genitalia, dorsal. Scale bars are 50 µm.