Heteragrion itacolomii sp. nov. (Odonata: Zygoptera: Heteragrionidae) from Itacolomi State Park, Ouro Preto, Minas Gerais, Brazil
Ávila Júnior, Walter F.
Lencioni, Frederico A. A.
Carneiro, Marco Antônio A.
Zootaxa
2020
2020-05-18
4779
1
121
130
Ávila Júnior & Lencioni & Carneiro, 2020
Ávila Júnior & Lencioni & Carneiro
2020
[151,428,693,720]
Insecta
Megapodagrionidae
Heteragrion
Animalia
Odonata
1
122
Arthropoda
species
itacolomii
sp. nov.
( Figs. 1–7, 9–10)
Holotype. ♂(deposited in ABMM/CCT-UFMG, NC: UFMG-ODO-2000000). Brazil, Minas Gerais, Ouro Preto, Parque Estadual do Itacolomi, Trilha da Lagoa, ( 23-xii-2018, 20º25’57”S, 43º30’27”W, 1350 m, Ávila-Jr, W.F.leg.). FIGURE 1. Heteragrion itacolomii sp. nov.in life, male paratype. Photo: Ávila Jr, W.F. Paratypes. 6 ♂♂. Threewith same data as holotype; one with same data as allotypebut Carneiro, M. A. A.leg.; one with same data as allotype, collected in tandem; and one with same data as holotypebut collected on 25-x-2018; 1 ♂deposited in MNRJ(NC: ODO-0283); 2 ♂♂deposited in FAAL(NC: 4816 and 4819); 1 ♂deposited in DZUP(NC: 500256); 2 ♂♂deposited in LEE. Allotype. ♀(Deposited in ABMM/ CCT– NC: UFMG-ODO-2000001, same data as holotype, but collected in tandem on 20-iii-2019)
Etymology: The name of the new species is in reference to the typelocality, Itacolomi State Park. Itacolomi is of Tupi “indigenous language” origin (Ita = stone + curumim = child).
Description of holotype( Figs. 2 A, 3 A, 4 A, 5, 6 A, 9 D, 9 L) Head. Labrum dark yellow with black spot in center; postclypeus black; post frons with black plate across epicranium (PF + VX + OC); antennae black ( Fig. 3 A). FIGURE 2. Heteragrion itacolomii sp. nov., habitus: (2A) holotype male in lateral view; (2B) allotype female in lateral view. FIGURE 3. Heteragrion itacolomii sp. nov., head: (3A) holotype male in dorsal view; (3B) allotype female in dorsal view. FIGURE 4. Heteragrion itacolomii sp. nov., thorax: (4A) holotype male in lateral view; (4B) allotype female in lateral view. Thorax. Anterior lobe of prothorax black, middle lobe with black pigment on both sides and posterior lobe with central black spot extending to edges of side; propleuron pale yellowish ( Fig. 6 A). Pterothorax: middorsal carina black; mesepisternum in dorsal view black with yellow spot; mesepisternum in lateral view pale yellowish with wide black stripe on mesepimeron, metepimeron pale yellowish; antealar carina black ( Fig. 4 A). Wings. Hyaline; FW 21 (Px); HW 18 (Px); pterostigma covering 2 cells of left FW; 3 cells in left HW; 2 cells in right FW; 2 + 1/2 cells in right HW. Abdomen. S1 pale yellow with dorsal black spot; S2 pale yellow with black band of sides reaching dorsum without contact, forming yellow dorsal band; S3 equal to S2 except black band located ventrally near S4; S4–6 equal to S3; S7 black; S8 with black spot near S7 and pale yellow coloring near S9; S9 pale yellow; S10 pale yellow with dorsal black spot ( Fig. 2 A). Caudal appendages. Cerci in lateral view with dorsobasal expansion present, ventrobasal expansion robust, occupying 2/3 of length, ventral margin rounded ( Figs. 5 A; 9 H); cerci in dorsal view with subequal basal and medial portions, apical portion long, ventral branch of medial process a triangular plate with truncate apex, a ridge like an inverted S, dorsal branch absent ( Figs. 5 B, 9 L). Measurements. Abdomen 41.68; FW length 30.25; HW length 29.46, cerci 1.48. Variation in males.Wing: FW with 20 to 22 (Px); HW with 17 to 19 (Px); number of cells covered by pterostigma of left FW ranging 1/2 + 2 to 3; of left HW ranging 1/3 + 2 to 3; of right FW ranging 1 + 1/2 to 2 + 1/2; of right HW ranging 2 to 2 + 1/3. Measurements. Abdomen 32.63–41.46, FW length 27.20–32.08, HW length 26.28–30.92, cerci 1.29–1.42. FIGURE 5.Comparison between the cerci: Heteragrion itacolomii sp. nov.(A) in lateral view; (B) dorsal view; H. freddiemercury(C) in lateral view and (D) mediodorsal view. Description of allotype( Figs. 2 B, 3 B, 4 B, 6 B, 7, 10) Head. Labrum brown with black spot in center; postclypeus black, antefrons with black spot in frontal region extending to frontal region of eyes; black band connecting middle of the eyes to occiput ( Fig. 3 B). Thorax. Anterior lobe of prothorax black with two elliptical pale spots; middle lobe of prothorax pale; posterior lobe of prothorax with large black spot in center and small black spot with hair on ends; propleuron and procoxa pale ( Fig. 6 B). Pterohorax: black stripe accompanying the middorsal carina; mesepisternum pale with black spot in posterior region; mesinfraepisternum pale; mesepimeron with incomplete black strip reach to mesopleural fossa; antealar carina black; metinfraepisternum, metepisternum and metepimeron pale ( Fig. 4 B), intersternite surpassing setifer, dorsally curved with dorsal end elongated and rounded, with the presence of a crossing carina ( Fig. 7). FIGURE 6. Heteragrion itacolomii sp. nov., prothorax: (6A) holotype male in dorsal view; (6B) allotype female in dorsal view. Wing. Hyaline, left FW 20 (Px); right FW 20 (Px); left HW 15 (Px); right HW 17 (Px). Abdomen. S1 pale with black dorsal surface; S2 pale with incomplete lateral black stripe on dorsal surface forming a thin pale line; S3 similar to S2 with incomplete black ring between S3 and S4; S4–8 similar to S3; S9 pale with segment of black lateral stripe ending in medial region; S10 pale ( Fig. 2 B). Genital valves of ovipositor with ventral edge containing teeth disposed in four rows ( Fig. 10 B) Measurements. Abdomen 32.6; FW length 29.7; HW length 28.8, appendages 0.65.
Differential diagnosis.The species with the most similar cerci to those of H. itacolomiiis H. freddiemercury.However, H. freddiemercuryhas an almost straight margin of the ventral expansion, a ventral branch as a triangular plate with a truncated apex and a ridge dividing it into two parts, and a roughly triangular dorsal branch that is fused with the ridge at 2/3 from the base and with a strongly sclerotized inner edge ( Lencioni 2013). For H. itacolomii sp. nov., the ventral expansion is more robust and has a rounded ventral margin, the ventral branch is a triangular plate with a truncated apex, a ridge like an inverted S and no dorsal branch of the medial process ( Table 1, Figs. 5, 9 H, 9 L). For other species in which thorax color is similar, the difference in cerci morphology can be found in the ( Fig. 9). FIGURE 7. Heteragrion itacolomii sp. nov.; intersternite of allotype female in lateral view. TABLE 1.Diagnostic table of male characteristics separating Heteragrion itacolomii sp. nov.from H. freddiemercuryi. Characters Heteragrion itacolomii sp. nov. H. freddiemercuryi Ventro-basal expansion very large, occupying almost 2/3 length of cerci, robust and rounded ventral margin in lateral view. very large, occupying almost 2/3 length of cerci, ventral margin almost straight in lateral view Apical portion of cerci Ventral branch of medial process twice the size of the basal portion triangular plate with apex truncated, a ridge like an inverted S longest triangular plate with apex truncated, ridge dividing it in two parts Dorsal branch of medial process absent roughly triangular and fused with ridge at 2/3 from base, inner edge strongly sclerotized Posterior pronotal lobe central black spot and lateral margins matte black Cerci Total length (mm) yellowish 50.66–51.34 orange 52–55.5 Habitat and Ecology.The Itacolomi State Park presents a transition vegetation between Atlantic Forest and Cerrado. In addition to assisting in the conservation of animal and plant species in these two important biomes,the Conservation Unit also features areas called Rupestrian field, an environment with outcrop rocky and high rates of endemic species and an altitude above 900m( Giulietti et al.1987, Safford 1999). FIGURE 8.Type locality: Trilha da Lagoa, Itacolomi State Park, Ouro Preto, Minas Gerais, Brazil. Heteragrion itacolomiiwas collected in a narrow (approximately 1.5mwide) stream that flows into a forest, with a little direct incidence of sunlight. The vegetation is considered secondary Atlantic Forest and the area was widely used in the last century for Camellia sinensisL. (tea) to export commercially ( Fig. 8). Individuals were observed on the same perches on sticks or leaves near water level during every visit. A few individuals were observed throughout the study and no agonistic behavior was exhibited.
2620453306
2018-12-23
ABMM
da Lagoa & Walter F. Ávila Júnior
Brazil
Ouro Preto
1350
-20.432499
Trilha da Lagoa
21
-43.5075
Parque Estadual do Itacolomi
1
122
1
1
Minas Gerais
holotype
2620453304
2018-10-25
ABMM
Three & Carneiro, M. A. A.
Brazil
Ouro Preto
1350
-20.432499
Trilha da Lagoa
21
-43.5075
Parque Estadual do Itacolomi
2
123
6
6
Minas Gerais
paratype
2620453302
[151,624,225,251]
MNRJ
Brazil
2
123
1
1
Minas Gerais
paratype
2620453303
[635,1163,225,251]
FAAL
Brazil
2
123
2
2
Minas Gerais
paratype
2620453305
DZUP
Brazil
2
123
1
1
Minas Gerais
paratype
2620453301
2019-03-20
ABMM, CCT
da Lagoa & Walter F. Ávila Júnior
Brazil
Ouro Preto
1350
-20.432499
Trilha da Lagoa
21
-43.5075
Parque Estadual do Itacolomi
2
123
1
1
Minas Gerais
allotype