Petalocladius dominiensis Andersen & Baranov, 2024

Andersen, Trond, Höcherl, Amelie, Sanz-laParra, Annui Malla, Bastardo, Ruth H. & Baranov, Viktor, 2024, A New Species Of Petalocladius Sublette & Wirth, 1972 (Diptera, Chironomidae, Orthocladiinae) From The Dominican Republic, With An Emended Generic Diagnosis, CHIRONOMUS Journal of Chironomidae Research 2024 (38), pp. 4-13 : 6

Petalocladius dominiensis Andersen & Baranov sp. n.

https://zoobank.org/ 7EB030EA-FD3E-44A3- ACA7-4A1764E8C691

Type material: Holotype ♂, slide mounted in Euparal. Dominican Republic, La Vega Province, Ebano Verde Scientific Reserve , 19°0’31”N 70°5’43”W, 1065 m asl., 08.12.2019, light trap, leg. Amelie Höcherl ( ZMBN).

Etymology: Named after the Dominican Republic, using the latin suffix -ensis denoting country of origin.

Diagnostic characters

The new species is slightly smaller than Petalocladius setosus , with about 115 dorsocentrals compared to 56 in P. setosus . The inferior volsella is broadly subtriangular, while lingulate in P. setosus , and the gonostylus has a small but distinct megaseta and a subapical brush of spinelike seta, which seems to lack in P. setosus .

Description

Male (n = 1). Total length 2.94 mm. Wing length 1.62 mm. Total length / wing length 1.81. Wing length / length of profemur 2.64.

Coloration. Head, thorax and abdomen brown, legs light brown.

Antenna. AR 0.69. Ultimate flagellomere 296 μm long.

Head. Eye hairy. Temporal setae 6 including 2 inner verticals, 2 outer verticals and 2 postorbitals. Clypeus with 17 setae. Tentorium 139 μm long, 30 μm wide; stipes 109 μm long. Palp as in Fig. 1A; palp segment lengths (in μm): 39, 47, 78, 103, 131. Third palpomere with 2 sensilla clavata subapically, longest 13 μm long.

Wing ( Fig. 2 ). VR 1.16. Costal extension about 174 μm long. Brachiolum with 1 seta, R with 6 setae, remaining veins and cells bare. Squama with 7 setae. Sc and R 2+3 could not be discerned, but wing apparently not fully hardened.

Legs. Spur of fore tibia 42 μm long, spurs of mid tibia 28 μm and 21 μm long, spurs of hind tibia 57 μm and 22 μm long. Width at apex of fore tibia 44 μm, of mid tibia 36 μm, of hind tibia 43 μm. Comb apparently with 6 setae, longest 33 μm long, shortest 21 μm long. Lengths and proportions of legs as in Table 1.

Hypopygium ( Figs 1C, D, Figs 3 A-C). Tergite IX with 16 setae. Laterosternite IX with 6 setae. Transverse sternapodeme arched with weak oral projections, 117 μm long. Phallapodeme not measurable. Gonocoxite 267 μm long; densely setose, with some strong, wavy setae apico-laterally, longest about 110 μm long. Inferior volsella subtriangular, 51 μm wide basally, 68 μm long, with row of 7 strong spinelike setae along inner margin and additional weaker dorsal and ventral setae. Gonostylus 86 μm long, 66 μm wide, with brush of spine-like seta subapically, the longest slightly lanceolate and curved; megaseta small, 12 μm long, with denticles; heel 166 μm long, 16 μm wide medially, with rounded apex and few setae subapically, longest about 17 μm long. HR = 3.10; HV = 3.42.

Female and immatures. Unknown.

Figures

Figure 2. Petalocladius dominiensis Andersen & Baranov sp. n., male. Wing.

Figure 3. Petalocladius dominiensis Andersen & Baranov sp. n., male. A. Hypopygium, dorsal view. B. Inferior vol- sella. C. Apex of gonostylus, showing the megaseta.