Megalabiops, Kaltenbach & Gattolliat, 2021
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publication ID |
https://dx.doi.org/10.3897/afrinvertebr.62.73911 |
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publication LSID |
lsid:zoobank.org:pub:1AD5CF82-F14B-4ADA-8034-4646C0AF300D |
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persistent identifier |
https://treatment.plazi.org/id/871DA221-4FDB-4CF6-B81B-88E6C35527AB |
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taxon LSID |
lsid:zoobank.org:act:871DA221-4FDB-4CF6-B81B-88E6C35527AB |
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treatment provided by |
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scientific name |
Megalabiops |
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gen. nov. |
Megalabiops gen. nov.
Figures 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7
Type species.
Megalabiops madagasikara gen. et sp. nov., by present designation.
Diagnosis.
Nymph. This new genus is distinguished by the combination of the following characters: A) body rather short and stocky (Fig. 1 View Figure 1 ); B) base of antennae close to each other, with rather broad carina between them (Fig. 2a View Figure 2 ); C) pedicellus with many long, stout, pointed setae (Fig. 3a View Figure 3 ); D) labrum rather small, lateral margins straight, distal margin largely V-shaped; dorsal surface with one long, submedian seta and submarginal arc of setae restricted to a few simple setae (Fig. 3b View Figure 3 ); E) both mandibles with brush of medium, fine setae between prostheca and mola (Fig. 3c, f View Figure 3 ); F) hypopharynx with large, medial tuft of stout setae (Fig. 4a View Figure 4 ); G) maxillary palp 2-segmented (Fig. 4b View Figure 4 ); H) labium with strongly enlarged mentum (Fig. 2b-d View Figure 2 ); glossae basally broad, narrowing toward apex, shorter than paraglossae; inner ventrolateral margin of glossae with a row of long, simple setae, close to ventrolateral margin with a row of very long, simple setae, apically with some very robust, long, curved setae; stout paraglossae, slightly curved inward, apex with three rows of stout, pectinate setae; labial palps segment II without distolateral protuberance, segment III slightly pentagonal (Fig. 4d, e View Figure 4 ); I) forelegs with a row of long, spine-like setae on dorsal margin of femur; femoral patch absent on all legs; patellotibial suture absent on foreleg and present on middle and hind legs; claw strongly elongated, pointed, with two rows of numerous, minute denticles (Fig. 5a, b View Figure 5 ); J) posterior margin of abdominal tergites with triangular spines, lateral margins without spines (Fig. 6a View Figure 6 ).
Imagines.
Unknown.
Etymology.
Megalabiops is an arbitrary combination of letters with allusion to the Greek words mega and iops, and the Latin word labium. Megalab - is with reference to the strongly enlarged labium and - iops with reference to the Baetidae which look and move like small fishes. The gender is feminine.
Description.
Nymph. (Figs 1 View Figure 1 - 7 View Figure 7 ).
Body. Short and stocky (Figs 1 View Figure 1 , 2 View Figure 2 ).
Head. Antenna (Figs 2a View Figure 2 , 3a View Figure 3 ). Antennae bases close to each other, with broad carina between them. Pedicellus with many long, stout, pointed setae; scapus bare.
Labrum (Fig. 3b View Figure 3 ). Rather small, lateral margins straight and distal margin largely V-shaped, wider than long; on dorsal surface with one submedian, long, simple seta and submarginal arc of setae restricted to few simple setae; on ventral margin anterolaterally and medially with a row of long, fine setae.
Right mandible (Fig. 3c, d, e View Figure 3 ). Incisor and kinetodontium cleft, kinetodontium with distinct denticles; inner margin of innermost denticle without a row of thin setae; prostheca stick-like, apicolaterally denticulate; margin between prostheca and mola with brush of abundant, medium, fine setae.
Left mandible (Fig. 3f, g, h View Figure 3 ). Incisor and kinetodontium partially cleft, kinetodontium with distinct denticles; prostheca robust, apically with denticles and comb-shaped structure; margin between prostheca and mola with brush of abundant, medium, fine setae; mola slightly reduced in size.
Hypopharynx (Fig. 4a View Figure 4 ). Lingua rather broad and expanded, with large dorsomedial tuft of stout setae.
Maxilla (Fig. 4b, c View Figure 4 ). Apically with three canines and three denti-setae; distal denti-seta tooth-like, closely attached to canines, following same direction as canines, other denti-setae slender, bifid and pectinate; maxillary palp 2-segmented, apically pointed and with stout seta at the tip.
Labium (Figs 2b-d View Figure 2 , 4d, e View Figure 4 ). Mentum strongly enlarged (long, very thick). Glossae basally broad, narrowing toward apex, shorter than paraglossae; inner ventrolateral margin with row of long, simple setae and close to inner margin with row of very long, simple setae; apically with some very robust, long, curved setae. Paraglossae broad, slightly curved inward, with convex outer margin; apically with three rows of long, stout, pectinate setae. Labial palps long, segment II without distolateral protuberance, segment III almost pentagonal, distal margin straight, lateral margin curved.
Thorax. Hind protoptera well developed.
Foreleg (Fig. 5a, b View Figure 5 ). Femur stocky with a row of long, spine-like setae on dorsal margin and many long, spine-like setae along ventral margin; femoral patch absent. Tibia stocky, slightly shorter than tarsus. Patellotibial suture absent, connection between tibia and tarsus tight. Claw strongly elongated, pointed; with two long rows of numerous, minute denticles; subapical setae absent.
Middle and hind legs (Fig. 5c View Figure 5 ). Femur slenderer than at foreleg; femoral patch absent. Tibia. Patellotibial suture present. Claw as in foreleg.
Abdomen. Tergites (Fig. 6a View Figure 6 ). Posterior margin with triangular spines on all segments; lateral margins without spines.
Gills (Fig. 6c View Figure 6 ). Seven pairs of gills on segments I-VII, dorsally oriented.
Paraproct (Fig. 6b View Figure 6 ). With slight, rounded expansion at posterior margin; with numerous, stout, marginal spines.
Caudal filaments (Fig. 1 View Figure 1 ). Inner margin of cerci with 3 to more than 15 long, thin primary swimming setae per segment, increasing in number distally; paracercus bilaterally with 4 to more than 13 long, thin primary swimming setae per segment, increasing in number distally.
Description.
Imagines. Unknown.
Distribution.
(Fig. 7 View Figure 7 ). Madagascar: Eastern coast.
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