Dabulamanzia mayottensis, Kaltenbach & Mary & Gattolliat, 2021

Kaltenbach, Thomas, Mary, Nathalie & Gattolliat, Jean-Luc, 2021, The Baetidae (Ephemeroptera) of the Comoros and Mayotte, African Invertebrates 62 (2), pp. 427-463 : 427

3. Dabulamanzia mayottensis sp. nov.

Figures 2b , 6 , 7 , 8

Diagnosis.

Nymph. Following combination of characters: A) labrum on dorsal surface with a simple submedian seta and a submarginal arc of four simple setae; B) both mandibles with stout setae between prostheca and mola; C) labium with glossae as long as paraglossae, labial palp segment II without protuberance; C) maxillary palp slightly longer than galea-lacinia, segment II apically pointed; D) fore femur rather broad, length ca. 3 × maximum width; dorsal margin with ca. 12 curved, spine-like setae; tibia proximally with long arc of long, simple setae; E) hind protoptera well developed; F) seven pairs of gills.

Description.

Nymph (Figs 2b , 6 , 7 ). Body length 3.0-4.0 mm. Cerci: ca. 2/3 of body length. Paracercus: slightly shorter than cerci. Antenna: approx. 2 × as long as head length.

Colouration (Fig. 2b ). Head, thorax and abdomen dorsally brown, with pattern as in Fig. 2b . Head, thorax and abdomen ventrally light brown. Legs mainly light brown, femur with dorsomedial brown streak, apex brown; tibia proximally brown; tarsus brown. Caudalii light brown.

Labrum (Fig. 6a ). Subrectangular, length 0.7 × maximum width. Distal margin with medial emargination and small process. Dorsally with long, fine, simple setae scattered over surface; one simple submedian seta and submarginal arc of four simple setae. Ventrally with marginal row of setae composed anterolateral long, feathered setae and medial long, bifid setae; ventral surface with ca. five short, spine-like setae near lateral and anterolateral margin.

Right mandible (Fig. 6b-d ). Incisor and kinetodontium partly fused. Incisor with three denticles, distal denticle blade-like; kinetodontium with three denticles. Prostheca stick-like, distolaterally denticulate. Margin between prostheca and mola straight, with long, stout setae. Tuft of setae at apex of mola present.

Left mandible (Fig. 6e-g ). Incisor and kinetodontium fused. Incisor with three denticles, distal denticle blade-like; kinetodontium with three denticles. Prostheca robust, apically with small denticles and comb-shaped structure. Margin between prostheca and mola straight, with medium, stout setae. Subtriangular process long and slender, above level of area between prostheca and mola. Tuft of setae at apex of mola present.

Both mandibles with lateral margins almost straight. Basal half with fine, simple setae scattered over dorsal surface.

Hypopharynx and superlinguae (Fig. 6h ). Lingua as long as superlinguae. Lingua longer than broad; distal half laterally slightly expanded; distal margin with short, fine setae, tuft of stout setae absent. Superlinguae distally straight; lateral margins rounded; fine, long, simple setae along distal margin.

Maxilla (Fig. 6i ). Galea-lacinia ventrally with two simple, apical setae under canines. Inner dorsal row of setae with three denti-setae, distal denti-seta tooth-like and slightly directed against canines; middle and proximal denti-setae slender, bifid and pectinate. Medially with one pectinate, spine-like seta and five or six long, simple setae. Maxillary palp slightly longer than length of galea-lacinia; 2-segmented; palp segment II 1.7 × length of segment I; setae on maxillary palp fine, simple, scattered over surface of segments I and II; apex of last segment pointed.

Labium (Fig. 6j, k ). Glossa basally broad, narrowing toward apex; as long as paraglossa; inner margin with nine spine-like setae, increasing in length distally; apex with three long, robust setae; outer margin with seven or eight spine-like setae; ventral surface with fine, simple, scattered setae. Paraglossa sub-rectangular, curved inward; apex rounded; with many long, robust setae in apical area and along apicolateral margin; two short, simple setae in anteromedial area; dorsally with row of three long, spine-like, simple setae near inner margin. Labial palp with segment I 0.9 × length of segments II and III combined. Segment I ventrally with short, fine, simple setae. Segment II without distomedial protuberance; ventral surface with short, fine, simple setae; dorsally with five spine-like setae. Segment III slightly pentagonal; length 1.1 × maximum width; ventrally covered with short, spine-like, simple setae and short, fine, simple setae.

Hind protoptera (Fig. 7f ) well developed.

Foreleg (Fig. 7a, b ). Ratio of foreleg segments 1.8:1.0:1.0:0.3. Femur. Length ca. 3 × maximum width. Dorsal margin with 9-12 curved, spine-like setae. Apex rounded, with pair of spine-like setae and fine, simple setae. Stout, lanceolate setae scattered along ventral margin; femoral patch absent. Tibia. Dorsal margin with row of fine simple setae. Ventral margin with row of short, curved, spine-like setae, on apex some longer, pectinate setae. Anterior surface scattered with few short, stout, lanceolate setae; proximally long arc of long, fine, simple setae, reaching posterior side. Patellotibial suture absent. Tarsus. Dorsal margin almost bare. Ventral margin with row of short, curved, spine-like setae. Claw with one row of four denticles, the two distal ones larger than the two proximal ones; distally pointed; with ca. four stripes; subapical setae absent.

Middle and hind legs. As foreleg, but with patellotibial suture.

Terga (Fig. 7c ). Surface with irregular rows of U-shaped scale bases and scattered micropores. Posterior margin of tergum IV with triangular spines, longer than wide.

Gills (Fig. 7d ). Present on segments I-VII. Margin with small denticles intercalating short, fine, simple setae. Tracheae extending from main trunk to inner and outer margins. Gill I as long as ¾ length of segment II, gill IV as long as length of segments V and VI combined; gill VII as long as length of segments VIII and IX combined.

Paraproct (Fig. 7e ). Distally not expanded, with 14-16 marginal spines. Surface scattered with U-shaped scale bases, fine, simple setae and micropores. Cercotractor with small, marginal spines.

Etymology.

With reference to the island of Mayotte, where the type locality is.

Distribution

(Fig. 8 ). Mayotte.

Biological aspects.

The specimens were collected at altitudes between sea level and 110 m, mostly together with one or several other Baetidae species living in Mayotte ( Afroptilum bicorne , Cloeon smaeleni , Labiobaetis glaucus , Procloeon cylindroculum ).

Type material.

Holotype. Mayotte • nymph; Riv. Dembéni, Loc. Dembeni intermédiaire; 12°51'07"S, 45°09'41"E; 95 m; 20.04.2009; leg. N. Mary; on slide; GBIFCH00592797 ; MZL. Paratypes. Mayotte • 11 nymphs; same data as holotype; in alcohol; GBIFCH00515706 , GBIFCH00515719 ; MZL, FAMU • 2 nymphs; Riv. Longoni, Loc. Longoni aval; 12°44'20"S, 45°09'53"E; 30 m; 14.05.2006; leg. N. Mary; on slides; GBIFCH00592746 , GBIFCH592747 ; MZL • 25 nymphs; Riv. Longoni, Loc. Longoni aval; 12°44'20"S, 45°09'53"E; 30 m; 16.04.2009; leg. N. Mary; 2 on slides; GBIFCH00592720 , GBIFCH00592721 ; 23 in alcohol; GBIFCH00515703 , GBIFCH00515724 ; MZL, FAMU • 2 nymphs; Riv. Dembéni, Loc. Dembeni aval; 12°50'31"S, 45°10'22"E; 10 m; 17.05.2006; leg. N. Mary; on slide; GBIFCH00592760 ; MZL • 20 nymphs; Riv. Dembéni, Loc. Dembeni aval; 12°50'31"S, 45°10'22"E; 10 m; 19.04.2009; leg. N. Mary; in alcohol; GBIFCH00515723 ; MZL • 13 nymphs; Bas. Riv. Djalimou, Djalimou aval; 12°57'14"S, 45°06'51"E; 15 m; 14.04.2009; leg. N. Mary; in alcohol; GBIFCH00515673 ; MZL • 5 nymphs; Bas. M’Tsangachéhi, Loc. M'Tsangachehi aval; 12°53'04"S, 45°07'55"E; 10 m; 14.04.2009; leg. N. Mary; in alcohol; GBIFCH00515677 ; MZL • 44 nymphs; Bas. Riv. Bouyouni, Loc. Bouyouni intermédiaire; 12°44'55"S, 45°08'36"E; 40 m; 16.04.2009; leg. N. Mary; in alcohol; GBIFCH00515679 , GBIFCH00515680 ; MZL • 53 nymphs; Riv. Koualé, Loc. Legion ; 12°47'49"S, 45°11'08"E; 50 m; 21.04.2009; leg. N. Mary; in alcohol; GBIFCH00515722 ; MZL • 20 nymphs; Riv. Koualé, Loc. Kouale aval; 12°48'20"S, 45°11'54"E; 10 m; 13.04.2009; leg. N. Mary; in alcohol; GBIFCH00515721 ; MZL • 1 nymph; Riv. Koualé, Loc. Kouale , st. 2; 12°48'00"S, 45°11'09"E; 50 m; 17.05.2006; leg. N. Mary; in alcohol; GBIFCH00515704 ; MZL • 20 nymphs; Bas. Riv. Gouloué, Loc. Gouloue captage; 12°47'27"S, 45°11'22"E; 110 m; 15.04.2009; leg. N. Mary; in alcohol; GBIFCH00515720 ; MZL • 2 nymphs; Bas. Riv. Coconi, Loc. Coconi aval cascade; 12°50'05"S, 45°07'41"E; 02.2018; leg. N. Mary; in alcohol; GBIFCH00515705 ; MZL.

Figures

Figure 2. Nymphs, habitus: a Afroptilum bicorne b Dabulamanzia mayottensis sp. nov.

Figure 6. Dabulamanzia mayottensis sp. nov., nymph morphology: a labrum b right mandible c right prostheca d right incisor and kinetodontium e left mandible f left prostheca g Left incisor and kinetodontium h hypopharynx and superlinguae i maxilla j labium k apex of paraglossa. Scale bar: 0.1 mm.

Figure 7. Dabulamanzia mayottensis sp. nov., nymph morphology: a foreleg b fore claw c tergum IV d gill IV e paraproct f metanotum (left side), with hind protopteron (mature nymph). Scale bars: 0.1 mm.

Figure 8. Distribution of Dabulamanzia mayottensis sp. nov. in Mayotte.