Callibaetis gelidus, Cruz & Salles & Hamada, 2013

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2013, Callibaetis Eaton (Ephemeroptera: Baetidae) from Brazil, Journal of Natural History (J. Nat. Hist.) 48 (11 - 12), pp. 591-660 : 613-616

Callibaetis gelidus sp. nov.

( Figure 10 )

urn:lsid:zoobank.org:act:6547C53C-E014-4674-B26D-9B105EFC611A

Known stages: I ♀ ♂, N

Diagnosis

Male imago. (1) Dorsal portion of turbinate eyes circular, apical third with constriction, base is wider than apex in lateral view ( Figure 10A ); (2) forewing hyaline, except C, Sc, R 1 areas ( Figure 10D ); (3) marginal intercalary veins paired, except between veins MP and A ( Figure 10D ); (4) hind wing hyaline, sometimes with one brown mark near costal process ( Figure 10E, F ); (5) hind wing with costal process compound ( Figure 10E, F ); (6) abdominal sterna with one brown mark submedially; (7) forceps segment I cylindrical ( Figure 10C ).

Female imago. (1) Forewing hyaline, except C, Sc, R 1 and area around bulla brown coloured ( Figure 10H ); (2) marginal intercalary veins single ( Figure 10H ); (3) hind wing hyaline sometimes with one brown mark near costal process ( Figure 10I, J ); (4) costal process of hind wing compound ( Figure 10I, J ); (5) posterior margin of abdominal sterna with one brown mark medially; hyaline after oviposition ( Figure 10K ); (6) abdominal terga white, sometimes light brown with anterior margin with one brown mark medially; hyaline after oviposition ( Figure 10G ).

Mature nymph. As in C. nigracyclus sp. nov.

Description

Male imago. Length: body, 4.8 mm; cercus, 6.8 mm; forewing, 4.6 mm; hind wing, 0.4 mm; antenna, 0.9 mm; tibia I, 1 mm; tibia II, 0.9 mm; tibia III, 0.7 mm. (n = 2) Head ( Figure 10A, B ). Coloration light brown. Turbinate portion of compound eyes dorsally light brown, stalk larger than apex, apical third narrow. Antenna. Scape and pedicel with apex brown, flagellum brown with white base, longer than turbinate eyes. Dorsal portion of turbinate eyes circular; length 1 × width; stalk height 9 × dorsal portion height; base is wider than apex in lateral view; apical third with constriction; inner margins parallel, not reaching each other. Thorax ( Figure 10A, B ). Anteronotal protuberance medially light brown, submedially brown, laterally light brown; mesoscutum, submesoscutum, posterior scutal protuberance and scutellum brown. Anteronotal and metascutellar protuberance rounded. Legs: Femora I, II and III with discontinuous longitudinal black marks on external surface; tibiae I, II and III light brown with brown mark on apex; tarsi I, II, III and claws light brown. Leg I: tibia 0.8 × length of femur; tarsus 0.6 × length of femur. Leg III: tibia 1.3 × length of femur; tarsus 0.7 × length of femur. Wings. Forewing ( Figure 10D ) hyaline, except C, Sc, R 1 areas; veins light brown; stigmatic area with five to seven cross veins touching subcostal vein; marginal intercalary veins paired, except between veins MP and A; length of each intercalary vein 0.3–0.8 × distance between adjacent longitudinal vein; length of forewing about 3.2 × width. Hind wing ( Figure 10E, F ) hyaline, sometimes with one brown mark near costal process, with one incomplete and two complete longitudinal veins, without cross veins; costal process compound. Abdomen. Terga brown or light brown; tracheation black. Sterna light brown or brown, with one brown mark submedially. Caudal filaments white with brown mark on apex and base of each segment. Genitalia ( Figure 10C ). Forceps brown. Forceps segment I cylindrical; 0.3 × length of segment II; distance between base of forceps 0.4 × distance between lateral margins of forceps. Forceps segment III oval, 5 × as long as wide; 0.2 × length of segment II. Posterior margin of styliger plate without medial projection.

Female imago. Length: body, 6 mm; cercus, 8.6 mm; forewing, 5.5 mm; hind wing, 0.6 mm; antenna, 0.8 mm; tibia I, 0.9 mm; tibia II, 1.1 mm; tibia III, 1 mm. (n = 2). Head ( Figure 10G ). Coloration white, sometimes yellowish light brown; compound eyes black with longitudinal brown line. Antenna. Scape and pedicel with brown apex, flagellum light brown with base white. Thorax ( Figure 10G, K ). Anteronotal protuberance, mesoscutum, submesoscutum, posterior scutal protuberance and scutellum white (sometimes all thorax light brown). Anteronotal and metascutellar protuberance rounded. Legs: Femora I, II and III light brown with discontinuous longitudinal pigmented line on external surface; tibiae I, II and III light brown with brown mark ventrally on base and brown around apex; tarsi I, II and III light brown; claws light brown. Leg I: tibia 1.2 × length of femur; tarsus 0.8 × length of femur. Leg II: tibia 1 × length of femur; tarsus 0.4 × length of femur. Leg III: tibia 0.9 × length of femur; tarsus 0.3 × length of femur. Wings. Forewing ( Figure 10H ) hyaline, except C, Sc, R 1 and area around bulla brown coloured; veins brown; stigmatic area with four to six cross veins touching subcostal vein; marginal intercalary veins single; length of each intercalary vein 0.4–0.8 × distance between adjacent longitudinal veins; length of forewing about 2.7 × width. Hind wing ( Figure 10I, J ) hyaline, sometimes with one brown mark near costal process; one longitudinal incomplete vein, not reaching apex of hind wing and two longitudinal complete veins; one or two cross veins; costal process compound. Abdomen ( Figure 10G, K ). Terga white, sometimes light brown with anterior margin with one brown mark medially; hyaline after oviposition. Tracheation black. Sterna white, sometimes light brown, posterior margin with one brown mark medially; hyaline after oviposition. Caudal filaments white with base and apex of segments dark brown.

Etymology

The specific epithet is a reference to the abdominal colour, white like ice ( gelidus , from Latin, meaning “frosty”).

Comments

The nymphs of C. gelidus sp. nov. and C. nigracyclus sp. nov. cannot be distinguished.

Material examined

Holotype. Female imago, BRAZIL, Rondônia, Porto Velho, Igarapé Mamãe Quinó (8 ◦ 49 ′ 36.33 ′′ S, 63 ◦ 56 ′ 4.28 ′′ W), 12 / v / 2006, P. V. Cruz col. ( INPA).

Paratype. Four female imagos, Igarapé Mamãe Quinó (8 ◦ 49 ′ 36.33 ′′ S, 63 ◦ 56 ′ 4.28 ′′ W), 12 / v / 2006, P. V. Cruz col. ( INPA, CZNC). Female imago, five female subimagos, two nymphs, two exuviae, male imago, male subimago, Reserva Kaiari (8 ◦ 51 ′ 7.38 ′′ S, 63 ◦ 57 ′ 33.72 ′′ W), 7 / iv / 2007, P. V. Cruz col. ( INPA, CZNC). Nymph, Reserva Kaiari (8 ◦ 51 ′ 7.38 ′′ S, 63 ◦ 57 ′ 33.72 ′′ W), 15 / iv / 2007, P. V. Cruz col. ( INPA). Three nymphs, three female imagos, 20 exuviae, eight female subimagos, 11 male subimagos, Reserva Kaiari (8 ◦ 51 ′ 7.38 ′′ S, 63 ◦ 57 ′ 33.72 ′′ W), 26 / v / 2007, P. V. Cruz col. ( INPA, CZNC). Three female imagos, BRAZIL, Amazonas Manaus , Lake of Reserva ZF2 (02 ◦ 38 ′ 10.0 ′′ S, 60 ◦ 09 ′ 11.3 ′′ W), 14 / viii / 2008, illuminated sheet, P. V. Cruz col. ( INPA) .

Distribution

Brazil: Rondônia state, Porto Velho county ; Amazonas state, Manaus county .

Figures

Figure 10. (colour online) Callibaetis gelidus sp. nov. (A) male imago dorsal view; (B) male imago lateral view (red arrow indicate constriction); (C) genitalia; (D) male imago forewing (black arrow indicate area around bulla); (E) male imago hind wing; (F) detail of male imago hind wing; (G) female imago dorsal view; (H) female imago forewing (black arrow indicate area around bulla); (I) female imago hind wing; (J) detail of female imago hind wing; (K) female imago ventral view.