Poxyaibamberus jamanximensis Andersen & Dantas, 2024

Andersen, Trond, Dantas, Galileu P. S., Baranov, Viktor, Sanz-laParra, Annui M., Mendes, Humberto F. & Hamada, Neusa, 2024, Poxyaibamberus Andersen & Dantas, gen. nov. (Diptera, Chironomidae, Orthocladiinae) from Brazil, ZooKeys 1205, pp. 1-15 : 1-15

publication ID	https://doi.org/ 10.3897/zookeys.1205.124081
publication LSID	lsid:zoobank.org:pub:8D5E77EA-DD32-4E89-868B-17475C16DBA7
DOI	https://doi.org/10.5281/zenodo.11658946
persistent identifier	https://treatment.plazi.org/id/AC19B7F6-BE94-4368-B494-44A65957202E
taxon LSID	lsid:zoobank.org:act:AC19B7F6-BE94-4368-B494-44A65957202E
treatment provided by	ZooKeys by Pensoft
scientific name	Poxyaibamberus jamanximensis Andersen & Dantas
status	sp. nov.

Treatment

Poxyaibamberus jamanximensis Andersen & Dantas sp. nov.

Figs 1 A, B View Figure 1 , 2 View Figure 2 , 3 View Figure 3

Type locality.

Brazil, Pará State, Itaituba, Jamanxim National Park GoogleMaps ; 05 ° 41 ' 58 " S, 55 ° 48 ' 13 " W; 170 m a. s. l.; 20 November 2017; Gilberto Nicácio leg.

Type specimen.

Holotype male adult, slide-mounted in Euparal under six coverslips. Original label: “ Brasil, PA, 20 / 11 / 2017, Floresta # 41, Shannon trap, Orthocladiinae , leg. G. Nicasio, ♂ ”. ( INPA). GoogleMaps

Diagnostic characters.

The new species can easily be separated from P. ubajarensis Andersen & Dantas , sp. nov. by the shape of the gonostylus, as it has a rather narrow, weakly curved, tapering heel that is slightly longer than the gonostylus proper.

Description.

Adult male (n = 1). Total length 2.17 mm. Wing length 1.23 mm. Total length / wing length 1.77. Wing length / length of profemur 2.51.

Coloration. Head, thorax, and legs light yellowish brown; abdomen pale yellowish brown. Wing hyaline.

Antenna (Fig. 1 B View Figure 1 ). With 13 segments. AR = 0.94. Terminal flagellomere 340 µm long, with 21 µm long subapical seta.

Head (Fig. 1 A View Figure 1 ). Inner verticals 5, outer verticals 4, postorbitals not discernable. Clypeus with 4 setae. Tentorium 99 µm long, 17 µm wide. Stipes 76 µm long. Anterior margin of cibarial pump slightly convex. Palp with palpomere 4 and 5 not measurable; palpomere 1–3 lengths (in µm) as: 14, 25, 38. Third palpomere without sensilla clavata.

Thorax. Antepronotum with 2 ventrolateral setae. Acrostichals about 8, scalpellate, in double row starting some distance from antepronotum; dorsocentrals 8, uniserial; prealars 3. Scutellum apparently without setae.

Wing (Fig. 2 View Figure 2 ). VR = 1.33. Brachiolum with 1 seta, other veins and membrane bare. Squama bare. Costal extension 123 µm long.

Legs. Fore tibia with 33 µm long spur, mid tibia with 28 and 15 µm long spurs, hind tibia with 45 and 21 µm long spurs. Width at apex of fore tibia 27 µm, of mid tibia 28 µm, of hind tibia 29 µm. Hind tibia with comb of 4 bristles, longest apparently about 28 µm long. Lengths and proportions of legs as in Table 1 View Table 1 .

Hypopygium (Fig. 3 A – C View Figure 3 ). Anal point large, broadly triangular with rounded apex, starting high on tergite IX, with microtrichia and 12 strong setae in basal 1 / 3; 76 µm long, 39 µm wide near base, 18 µm wide medially. Laterosternite IX with 1 seta. Phallapodeme 76 µm long. Transverse sternapodeme arched, without oral projections, 62 µm long. Virga apparently consisting of field with small spines. Gonocoxite 203 µm long. Gonostylus straight, 104 µm long; heel weakly curved, tapering, 119 µm long; megaseta 7 µm long. HR = 1.95; HV = 2.09.

Immatures and female. Larva, pupa, and female are unknown.

Etymology.

The epithet, jamanximensis , is used as an adjective and meaning “ from Jamanxim ” in reference to the place of origin of the holotype.

Distribution.

The species is only known from the type locality in Jamanxim National Park, Pará State, in northern Brazil, where it was collected in a Shannon trap placed near a lower-order stream. Only a single male was collected despite intensive sampling effort during the expedition with successive sampling using several types of traps. According to data from the National Institute for Space Research, the Jamanxim National Park ranks among the conservation units with the highest deforestation rates in the Amazon. This situation underscores the need to increase the knowledge of the biodiversity in this region to better understand the anthropogenic impacts on the biota and to utilize this knowledge as tools for developing conservation strategies. The discovery of a new genus of Chironomidae in the park highlights the importance of further research to understand and preserve its unique biodiversity.