Callibaetis (Callibaetis) molinerii, Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017

Cruz, Paulo Vilela, Salles, Frederico Falcão & Hamada, Neusa, 2017, Four new species of Callibaetis Eaton (Ephemeroptera: Baetidae), nymphal description of Callibaetis (Abaetetuba) fasciatus (Pictet) and keys for South American species of Callibaetis, Zootaxa 4250 (3), pp. 229-261: 246-251

publication ID

https://doi.org/10.11646/zootaxa.4250.3.3

publication LSID

lsid:zoobank.org:pub:8D0213F2-B5F7-4CFB-BB3E-637EB6EDB684

persistent identifier

http://treatment.plazi.org/id/BC7B8E32-FFA9-FFDE-60C5-FF55CF1D8D46

treatment provided by

Plazi

scientific name

Callibaetis (Callibaetis) molinerii
status

sp. nov.

Callibaetis (Callibaetis) molinerii  sp. nov.

( Figs 13–16View FIGURE 13View FIGURE 14View FIGURE 15View FIGURE 16)

Callibaetis  sp. D: Cruz et al. 2016

Known stages. Male and female imagoes, nymph

Diagnoses. Male imago: 1) dorsal portion of turbinate eyes oval ( Fig. 13View FIGURE 13 A); 2) dorsal portion of turbinate eyes, in lateral view, without constriction ( Fig. 13View FIGURE 13 B); 3) turbinate portion of compound eyes (in lateral view) with divergent anterior and posterior margins ( Fig. 13View FIGURE 13 B); 4) forewing hyaline ( Fig. 13View FIGURE 13 G); 5) marginal intercalary veins paired ( Fig. 13View FIGURE 13 G); 6) hind wing hyaline ( Fig. 13View FIGURE 13 H); 7) hind wing with a rounded costal process ( Fig. 13View FIGURE 13 H); 8) marginal intercalary vein on hind wing present ( Fig. 13View FIGURE 13 H); 9) surface of abdominal sterna covered with brown spots ( Fig. 13View FIGURE 13 C); 10) abdominal sterna with pigmented medioanterior and medioposterior sigilla ( Fig. 13View FIGURE 13 C); 11) segment I of forceps wide at base ( Fig. 13View FIGURE 13 K); 12) segment III of forceps with truncated apex ( Fig. 13View FIGURE 13 K).

Female imago: 1) forewing brown, except basal third ( Fig. 13View FIGURE 13 I); 2) paired marginal intercalary veins ( Fig. 13View FIGURE 13 I); 3) hind wing with basal brown mark ( Fig. 13View FIGURE 13 J); 4) hind wing with a rounded costal process ( Fig. 13View FIGURE 13 J); 5) marginal intercalary veins on hind wing absent ( Fig. 13View FIGURE 13 J); 6) abdominal terga and sterna covered with brown spots ( Figs 13View FIGURE 13 D –F); 7) abdominal sterna with pigmented medioanterior and medioposterior sigilla ( Fig. 13View FIGURE 13 F); 8) absence of oblique marks on abdominal terga III, V and VII.

Mature nymph: 1) maxillary palp 1.5× length of galea-lacinia ( Fig. 14View FIGURE 14 E); 2) maxilla with tuft of stout setae on outer margin proximad of palp insertion ( Fig. 14View FIGURE 14 E); 3) paraglossae without row of stout setae on ventral surface ( Fig. 14View FIGURE 14 G); 4) segment III of labial palp rounded apically ( Fig. 14View FIGURE 14 G); 5) metanotum without spines; 6) anterior surface of fore tarsus with stout setae ( Fig. 15View FIGURE 15 C).

Description. Male Imago. Length: body, 6.6 mm; forewing, 6.2 mm; hind wing, 1.1 mm; tibiae, 1.8 mm (n=2). Head ( Fig. 13View FIGURE 13 A) brown. Turbinate portion of compound eyes dorsally yellowish brown, stalk yellowish white. Antenna with scape, pedicel and flagellum brown apically. Dorsal portion of turbinate eyes oval; inner margins parallel. Thorax with anteronotal protuberance, posterior scutal protuberance and scutellum brown. Anteronotal and metascutellar protuberance rounded. Femora with brown spots on posterior surface; tibiae, on ventral margin, with brown mark basally and apically; tarsi brown. Tibia I 1.3× length of femur I; tarsus I 1.3× length of femur I. Forewing hyaline ( Fig. 13View FIGURE 13 G); veins light brown; stigmatic area with six cross veins not reaching the subcostal vein; marginal intercalary veins paired; length of each intercalary vein 0.2× or less the distance between adjacent longitudinal veins; length of forewing about 2.5× its width. Hind wing hyaline, with five to seven cross veins ( Fig. 13View FIGURE 13 H); costal process rounded; marginal intercalary vein present. Abdomen with few spots on terga ( Fig. 13View FIGURE 13 A). Sterna covered with brown spots; medioanterior and medioposterior sigilla pigmented ( Fig. 13View FIGURE 13 C). Segment I of forceps ( Fig. 13View FIGURE 13 K) wide at base, 0.25× length of segment II; distance between base of forceps 0.2× distance between lateral margins of forceps; segment III of forceps truncated apically, length 0.9× width; 0.1× length of segment II. Posterior margin of styliger plate with small rounded medial projection. Cerci lost.

Female imago. Length: body, 6.2 mm; forewing, 6.6 mm; hind wing, 1.0 mm (n=2). Head ( Fig. 13View FIGURE 13 D) light brown, with four brown marks; compound eyes black. Antenna with apically brown scape and pedicel. Thorax with anteronotal protuberance light brown; posterior scutal protuberance brown. Anteronotal and metascutellar protuberance rounded. Femora with brown spots on anterior surface; tibiae with basal, medial and apical brown mark. Forewing brown, except on basal third ( Fig. 13View FIGURE 13 I); veins brown; stigmatic area with 4–6 cross veins reaching the subcostal vein and 1–2 veins which does not; marginal intercalary veins paired, except between ICuP and A; length of each intercalary vein 0.3× or less distance between adjacent longitudinal veins; length of forewing about 2.5× its width. Hind wing hyaline, with brown mark basally ( Fig. 13View FIGURE 13 J); costal process rounded; marginal intercalary veins absent. Abdomen with terga and sterna covered with brown spots ( Figs 13View FIGURE 13 D – 13F); abdominal sterna with pigmented medioanterior and medioposterior sigilla ( Fig. 13View FIGURE 13 F). Cerci lost.

Mature nymph. Length: body, 6.8 mm; cerci, 3.0 mm; paracercus, 2.7 mm (n=2) Head brown. Turbinate portion of male compound eyes yellowish brown. Antenna with spines and thin setae on flagellum ( Fig. 14View FIGURE 14 A). Labrum ( Fig. 14View FIGURE 14 B) maximum length about 1.3× minimum length; anterolateral margins with long and stout setae; distal margin with stout setae medially; dorsal surface with numerous long and thin setae; distal margin without setae ventrally; ventral surface with short and stout setae near lateral and anterolateral margin. Right mandible ( Fig. 14View FIGURE 14 C) with 4+3 denticles; margin between prostheca and mola straight; basal half with short, thin setae and pores scattered over dorsal surface. Left mandible ( Fig. 14View FIGURE 14 D) with 4+3 denticles; margin between prostheca and mola straight; basal half with short, thin setae and pores scattered over dorsal surface. Lingua of hypopharynx ( Fig. 14View FIGURE 14 F) with lobe covered with simple setae; short and thin setae scattered over inner margin of superlingua. Maxilla ( Fig. 14View FIGURE 14 E) medially, on inner margin, with 1+4 stout setae; with tuft of stout setae on outer margin proximad of palp insertion. Maxillary palp 1.5× length of galea-lacinia; palp segment II as long as segment I; outer margin of segment I covered with long and thin setae; inner and outer margin of segment I with short and stout setae; inner margin of segment II with one row of stout setae. Labium ( Fig. 14View FIGURE 14 G) with glossae shorter than paraglossae, inner margin of glossae with 11 stout setae; apex with one small and stout setae; outer margin with one row of long and stout setae; dorsal surface with one oblique tuft of long and stout setae and one tuft of small setae near outer margin. Dorsal surface of paraglossae with one longitudinal row of long stout setae near inner margin, one longitudinal row of long and stout setae at middle, covered with long and stout setae near outer margin; ventral surface without a row of stout setae. Labial palp with segment I 1.1× length of segments II and III combined; inner and outer margin of segment I with one row of stout setae; ventral surface of segment I with stout setae; inner margin of segment II with eight short and stout setae; dorsally with one row of eight short and stout setae; segment III with rounded apex, whole margin of segment III with stout setae. Thorax brown. Metanotum without spines. Foreleg ratio ( Fig. 15View FIGURE 15 A) 1.7:(0.9 mm):0.8:0.3. Forefemur length about 4.7× maximum width; dorsal margin with row of stout setae; length of setae on dorsal margin about 0.17× maximum width of femur; ventral margin with few short and stout setae; anterior surface, near dorsal margin, with one row of stout setae; anterior surface, near ventral margin with one row of trifid and stout setae on basal half, and one row of short, simple and stout setae on distal half. Ventral margin of tibia with one row of stout setae; anterior surface with one row of stout setae. Ventral margin of tarsus with two rows of setae, one stout and other short, trifid and stout ( Fig. 15View FIGURE 15 F); anterior surface with stout setae. Claw 0.3× length of tarsus ( Fig. 15View FIGURE 15 D). Mid and hind legs ( Fig. 15View FIGURE 15 E) with anterior surface of femora with stout setae near dorsal and ventral margins; anterior surface of tibiae covered with pectinate stout setae; tarsi with pectinate stout setae on ventral margin and anterior surface. Mid and hind claws with smaller denticles ( Fig. 15View FIGURE 15 E). Abdomen ( Fig. 16View FIGURE 16 A) light brown. Posterior margin of terga with regular spines ( Fig. 16View FIGURE 16 B). Surface of sterna covered with thin setae. Gill I subequal to length of segment II, with three folds. Gill IV equal to length of segments V and VI combined, with two folds. Gill VII equal to the length of segment VIII and half of segment IX combined, with one fold. Paraproct with ca. 34 marginal spines ( Fig. 16View FIGURE 16 C). Paracercus and cerci with long spines on all segments on apical half ( Fig. 16View FIGURE 16 F); basal half with long spines every two segments ( Figs 16View FIGURE 16 D, 16E).

Comments. The nymph of C. (Callibaetis) molinerii  sp. nov. is similar to the nymph of C. (Callibaetis) cruentus Cruz, Salles & Hamada  , and can be distinguished by the presence of tuft of stout setae on outer margin proximad of maxillary palp insertion in C. (Callibaetis) molinerii  sp. nov.

Etymology. The name of this species is in honour of Dr. Carlos Molineri, for his significant contributions to the knowledge of the Ephemeroptera  in South America.

Material examined. Holotype: one nymph, COLOMBIA, Caldas, Neira, afluente do Rio Tapia , Tareas , 19.vii.2011, corredeira, C. Molineri coll., INPA  . Paratypes: three female imagoes reared, five male imagoes reared, two male subimagoes reared, two female subimagoes reared, seven nymphs, COLOMBIA, Caldas, Neira, afluente do Rio Tapia, Tareas , 19.vii.2011, corredeira, C. Molineri coll., INPA  .

Distribution. Colombia: Caldas.

INPA

Instituto Nacional de Pesquisas da Amazonia