Research Article |
Corresponding author: Majida El Alami ( elalami.majida@gmail.com ) Corresponding author: Michel Sartori ( michel.sartori@vd.ch ) Academic editor: Eduardo Dominguez
© 2023 Majida El Alami, Laurent Vuataz, Sara El Yaagoubi, Michel Sartori.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
El Alami M, Vuataz L, El Yaagoubi S, Sartori M (2023) Another new species of the genus Habrophlebia Eaton, 1881 (Ephemeroptera, Leptophlebiidae) from the Maghreb. ZooKeys 1186: 47-70. https://doi.org/10.3897/zookeys.1186.112796
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A new species belonging to the genus Habrophlebia Eaton, 1881 is described at the nymphal stage from the Rif Mountains of Morocco. This species presents unique features, such as the chorionic arrangement of the egg and the ornamentation of the posterior margin of abdominal tergites. It is compared to all west European Habrophlebia species and a table with discriminating characters is given. A phylogenetic reconstruction based on COI sequences fully supports the hypothesis of a new species in the Rif Mountains, with possible further distribution in southern Spain.
COI, Habrophlebia dakkii sp. nov., mayflies, Morocco, Rif Mountains, Spain, systematics, West Palaearctic
Affiliated to the subfamily Habrophlebiinae (Leptophlebiidae), Habrophlebia Eaton, 1881 is a Holarctic genus, represented by a single species in the Nearctic (
With the exception of H. fusca, H. lauta McLachlan, 1884 and H. eldae Jacob & Sartori, 1984, the majority of species have a very restricted distribution. Habrophlebia antoninoi Alba-Tercedor, 2000, is a southern Iberian endemic, H. vaillantorum is a Moroccan High Atlas endemic, H. hassainae and H. djurdjurensis are Algerian endemics and H. consiglioi was collected only in Sardinia and Tunisia.
The isolation of populations in West Palearctic rivers and streams due to geographical barriers has favored speciation within the genus and contributed to an increase in the endemism rate within its biogeographical zone (
The Rif is the most northerly mountain range in Morocco. It is characterized by a number of features that give its aquatic fauna a certain originality (
Ongoing research on mayflies from northern Morocco has revealed that the Habrophlebia specimens are not related to either H. vaillantorum or H. fusca. They belong in fact to a new species that has been cited as Habrophlebia sp. in numerous works on the Rif (
The main objective of the present study is to describe this species based on Mrs El Alami’s collection and from material freshly collected by Ms El Yaagoubi. Morphological and molecular data (COI sequences) were combined to separate the nymphs of the Rif populations from other western Palearctic species. We also provide preliminary information on its distribution and ecological preferences.
Samplings were performed by the LESCB team between 1997 and 2023 (Fig.
Pictures of nymphal habitus were made using a Canon EOS 6D camera and the Visionary Digital Passport imaging system (formerly available and distributed by Dun Inc., Virginia), and processed with Adobe Photoshop Lightroom and Helicon Focus ver. 5.3.
Nymphal dissection was performed in Cellosolve or in 10% KOH, and specimens were mounted on slides with Euparal medium, or the dissected parts of the nymphs were mounted directly in Hoyer’s liquid (
Microscopic pictures were taken using an Olympus BX51 microscope coupled with an Olympus SC50 camera; pictures were enhanced with the stacking software Olympus Stream Basic ver. 2.3.2. and Adobe Photoshop ver. 21.2.2. Alternatively, pictures were taken using an Olympus CX41 microscope.
To complement our morphological investigations, we sequenced a 658 bp fragment of the mitochondrial gene cytochrome oxidase subunit 1 (COI hereafter) for specimens of the new species and other Habrophlebia species collected in the Maghreb. For this, the DNA extraction method described in
Newly sequenced specimens (nymphs) for the present study, with collection information, GenBank accession numbers and nomenclature details.
Specimen catalogue nb | Species | Country | Stage | Locality | GPS coordinates | Date | GenBank ID | GenSeq Nomenclature |
---|---|---|---|---|---|---|---|---|
GBIFCH01144259 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Sidi Yahia Aarab | 35°17.179'N, 4°53.625'W | 27.xi.2021 | OR570530 | genseq-2 COI |
GBIFCH01144258 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | El Ouesteyine | 35°17.299'N, 4°55.267'W | 1.ix.2021 | OR570531 | genseq-2 COI |
GBIFCH01144262 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Beni idder | 35°22.102'N, 5°32.283'W | 16.vii.2021 | OR570532 | genseq-2 COI |
GBIFCH00970948 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Tanaqoub | 35°5.533'N, 5°23.604'W | 31.iii.2021 | OR570533 | genseq-2 COI |
GBIFCH01144257 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Mezine village | 35°6.133'N, 5°20.767'W | 31.iii.2021 | OR570534 | genseq-2 COI |
GBIFCH00970944 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Jbel Laalam | 35°23.387'N, 5°29.953'W | 20.iv.2021 | OR570535 | genseq-2 COI |
GBIFCH00970947 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Souk El Had | 35°1.283'N, 5°25.300'W | 11.iv.2021 | OR570536 | genseq-2 COI |
GBIFCH00970945 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Tzroute | 35°16.583'N, 5°31.883'W | 2.v.2021 | OR570537 | genseq-2 COI |
GBIFCH01144261 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Tzroute | 35°16.583'N, 5°31.883'W | 2.v.2021 | OR570538 | genseq-2 COI |
GBIFCH00970946 | Habrophlebia dakkii sp. nov. | Morocco | Nymph | Hammadesh | 35°22.033'N, 5°32.033'W | 20.iv.2021 | OR570539 | genseq-2 COI |
GBIFCH00970949 | Habrophlebia sp. 2 | Morocco | Nymph | Afeska | 35°10.184'N, 5°13.105'W | 2.iv.2021 | OR570540 | genseq-4 COI |
79JJ30_B07 | Habrophlebia hassainae | Algeria | Nymph | El Ourit | 34°51'57’’N, 1°15'54’’W | 1.i.2016 | OR570541 | genseq-4 COI |
79JJ30_G06 | Habrophlebia hassainae | Algeria | Nymph | El Ourit | 34°51'57"N, 1°15'54"W | 5.ii.2016 | OR570542 | genseq-4 COI |
GBIFCH00673196 | Habrophlebia djurdjurensis | Algeria | Nymph | Tirourda | 36°29.431'N, 4°21.693'E | 9.vii.2019 | OR570543 | genseq-4 COI |
GBIFCH00673194 | Habrophlebia djurdjurensis | Algeria | Nymph | Echemlili | 36°28.267'N, 3°59.84'E | 25.v.2018 | OR570544 | genseq-4 COI |
GBIFCH00673195 | Habrophlebia djurdjurensis | Algeria | Nymph | Echemlili | 36°28.267'N, 3°59.84'E | 25.v.2018 | OR570545 | genseq-4 COI |
GBIFCH00673199 | Habrophlebia djurdjurensis | Algeria | Nymph | Ouadhias | 36°29.279'N, 4°07.362'E | 9.vii.2019 | OR570546 | genseq-4 COI |
GBIFCH01211557 | Habrophlebia djurdjurensis | Algeria | Nymph | Tala Rana Selloum 2 | 36°26.902'N, 4°18.820'E | 28.iv.2021 | OR570547 | genseq-4 COI |
To explore and visualize the COI evolutionary divergence, we employed pairwise genetic distances and gene tree approaches. COI pairwise distances were calculated using the dist.dna function from the ape 5.7-1 package (
Finally, we applied three contrasting single-locus species delimitation methods to our COI dataset: the distance-based ASAP (Assemble Species by Automatic Partitioning;
LESCB Laboratoire d’Ecologie, Systématique et Conservation de la Biodiversité (Morocco).
Habrophlebia
sp. in
Habrophlebia
sp.1 in
Holotype
: one nymph in ethanol (GBIFCH01133087), Morocco, Chefchaouen Province, S4 Oued Amazithen, Loc. El Ouesteyine; 35°17.299'N, 4°55.267'W; alt. 483 m; 2.IX.2021; S. El Yaagoubi leg.;
• Tetouan Province, S9 Oued El Hamma, Loc. Jbel Laalam; 35°23.387'N, 5°29.953'W; alt. 200 m; 20.IV.2021; S. El Yaagoubi leg.; 6 nymphs in ethanol (GBIFCH01133076);1 nymph on slide (GBIFCH00970944-DNA);
• Larache Province, S14 Oued Stah, Loc. Tzroute; 35°16.583'N, 5°31.883'W; alt. 766 m; 2.V.2021; S. El Yaagoubi leg.; 16 nymphs in ethanol (GBIFCH01133078); 2 nymphs on slide (GBIFCH00970945-DNA, GBIFCH01144261-DNA);
• Ouezzane Province, S13 Oued Qoub, Loc. Souk El Had; 35°1.283'N, 5°25.300'W; alt. 143 m; 11.IV.2021; S. El Yaagoubi leg.; 5 nymphs in ethanol (GBIFCH01133082); 1 nymph on slide (GBIFCH00970947-DNA);
Nymph. Coloration and dimensions. Body length of final instar, excluding caudal filaments, 5.2 to 6.5 mm for male and 5.5 to 8 mm for female. Cerci as long as body length. General dark brown coloration with light brown to yellowish markings mainly on abdominal terga. The whole cuticle is shagreened.
Head
. General coloration light brown; paler area between compound eyes and lateral ocelli; between ocelli, a dark brown mark not reaching the clypeus distally, and extending laterally in front of the compound eyes; vertex sutures yellowish, well visible (Fig.
Labrum
rectangular (Fig.
Mandibles
similar to other Habrophlebia species (Fig.
Maxilla
(Fig.
Hypopharynx
with highly developed superlinguae terminated by a membranous digitation (Fig.
Labium
(Fig.
Thorax.
Pro- and mesonotum yellowish to light brown, with greyish brown maculae, on medium and lateral margins (Fig.
Legs light to medium brown; dorsal surface of femora almost entirely washed with greyish brown macula; tarsi and tibiae generally lighter, except sometimes in mature nymphs.
Fore legs
(Fig.
Middle legs similar to fore legs, femora ca 2.5× longer than wide, dorsal surface of femora with more numerous and slightly longer stout and pointed setae; tibiae and femora of subequal length; tarsi 0.5× length of tibiae.
Hind legs
(Fig.
Abdomen.
Grey to dark brownish terga with characteristic light markings (Fig.
Gills
present on segments I–VII; all gills long and large; first gill (Fig.
Eggs ovoid, ca 155 µm x 80 µm, without ribs; chorion surface regularly decorated by numerous and small granulations (Fig.
Imago. Unknown.
The first author dedicates this species to her former mentor, Professor Dakki Mohamed. He contributed significantly to her training and specialization in the hydrobiological study of Moroccan streams.
The COI data set was > 97% complete and included 26% of parsimony informative sites. Pairwise COI distances across all sequences ranged from 0% to 18.2%. All species delimitation methods were fully congruent in delimiting nine Habrophlebia MOTUs (Fig.
Bayesian (BEAST) maximum clade credibility COI tree of the genus Habrophlebia in the West Palearctic. Branch ends labelled with GBIF or 79JJ30 codes indicate newly sequenced specimens; the other codes correspond to sequences obtained from various sources (see material and methods). Colored vertical boxes indicate species delimitation hypothesis (MOTUs) according to the ASAP, mPTP, and GMYC methods. For each MOTU, the corresponding species names (where available) and the country (-region) of origin is provided, with the newly described species and associated GBIF codes specified in bold. Circles on branches indicate Bayesian posterior probabilities > 0.9. The outgroup branches are presented in grey, along with their corresponding labels and species names.
Until the late 1970s, only two species of Ephemeroptera were known from the Rif, due to the works of
The main characters used to distinguish the hitherto known species from the new one, are presented in Table
Taxonomic criteria differentiating nymphs and eggs of Western Palaearctic Habrophlebia species: (0) Present study; (1)
Character | H. fusca | H. lauta | H. eldae | H. consiglioi | H. antoninoi (5) | H. vaillantorum | H. hassainae (6) | H. djurdjurensis (7) | H. dakkii sp.nov. (0) |
---|---|---|---|---|---|---|---|---|---|
Egg chorionic structure | ribs long, punctuated (1) | ribs long, not punctuated (2) | ribs long, slightly punctuated (3) | ribs barbed, long , punctuated (3,4) | ribs forming a reticulated mesh | ribs long, not punctuated (1) | ribs short, not punctuated | ribs long, not punctuated | without ribs, entirely covered with small granulations |
Position of the costal process of hind wing | middle (9) | middle (10) | middle (11) | middle (8) | distal | middle (1) | middle | middle | middle |
Bristles on upper face of hindfemur | truncated, entire (12) | pointed, entire (12) | pointed, fringed (12) | pointed, fringed (12) | ? | pointed, entire (13) | pointed, fringed | pointed, fringed | pointed, fringed |
Number of denticles on claws | 11–13 (11) | 14–16 (11) | 14–17 (11, 15) | 15–17 (11) | ? | 13–16 (1, 14) | 18–22 | 15–18 | 15–18 |
Size of distal denticles on claws | normal (11) | normal (11) | normal (11) | normal (11) | ? | reduced (1, 14) | normal | normal | normal |
Number of filaments on dorsal (costal) and ventral (anal) lamellae of gills II-VI | 7–8; 3–4 (13) | 5–7; 4–5 (13) | 3–7; 2–4(13) | 3–6; 1–3 (16) | ? | 5–6; 4–5 (1, 14) | 9–12; 5–8 | 8–11; 4–7 | 6–9; 3–4 |
Shape and size of posterior spines on abdominal segment IX | truncated, wider than long (1, 2, 16) | triangular, as long as wide at base (2, 16) | triangular, 2–3× longer than wide at base (2, 16) | triangular, 1.5–2× longer than wide at base (16) | ? | minute, needle-shaped (1) | triangular, 2–3× longer than wide at base | lanceolate, 2–3× longer than wide at base | triangular, 2–3× longer than wide at base |
Shape and size of posterior spines on abdominal segment VIII | truncated, wider than long (16) | triangular, as long as wide at base (16) | triangular, 2–3× longer than wide at base (16) | triangular, 1.5–2× longer than wide at base (16) | ? | ? (probably minute, needle-shaped) | triangular, 2–3× longer than wide at base | minute, needle-shaped | triangular, 2–3× longer than wide at base |
Shape and size of posterior spines on abdominal segment VII | truncated, wider than long (16) | triangular, as long as wide at base (16) | triangular, 2–3× longer than wide at base (16) | triangular, 1.5–2× longer than wide at base (16) | ? | minute, needle-shaped (1) | triangular, 2× longer than wide at base | minute, needle-shaped | triangular, 2–3× longer than wide at base |
Shape and size of posterior spines on abdominal segment V | truncated, wider than long (16) | triangular, as long as wide at base (16) | triangular, 2–3× longer than wide at base (16) | triangular, as long as wide at base (16) | ? | ? (probably minute or absent) | minute, needle-shaped | minute, needle-shaped | triangular, 2–3× longer than wide at base |
While the 11 sequences from the new species group together in a well-supported COI clade (Fig.
Also interesting is the close genetic relationship between H. hassainae and H. djurdjurensis; both species are only separated by a minimum genetic distance of 2.1%, which suggests they could belong to the same species. Morphologically however, both species differ by a number of characters (Table
Our COI analyses have identified a new Habrophlebia lineage in the Rif region, labeled as H. sp. 2 (Fig.
This species is widely distributed in the Rif, where it occupies a large range of biotope types, spanning from sea level up to an altitude of 780 m. It also tolerates wide variations in water conductivity (35 to 1112 µS/cm). Habrophlebia dakkii has a clear preference for poorly mineralized headwaters with moderate current velocity. The substrate is characterized by pebbles, gravel, sand and silt covered in some places with algae and submerged macrophytes, which provide excellent refuge for nymphs when the current is stronger.
The same remark was made by
Since this species has been found in localities on the Oued Ouergha, which is the Rif tributary of the Oued Sebou, we believe that its presence in the Haut Sebou (Middle Atlas) and the coastal Meseta is highly probable.
Nymphs of Habrophlebia dakkii sp. nov. can be found all year long, but are most abundant in spring, when temperatures are optimal for their development.
We express our gratitude to Céline Stoffel (
The authors have declared that no competing interests exist.
No ethical statement was reported.
No funding was reported.
Conceptualization: MS, MEA. Data curation: LV, SEY. Formal analysis: LV. Funding acquisition: MS. Investigation: SEY. Methodology: MEA. Project administration: MEA. Software: LV. Validation: MS, MEA. Writing - original draft: MEA. Writing - review and editing: MS, LV, MEA.
Majida El Alami https://orcid.org/0000-0003-2664-646X
Laurent Vuataz https://orcid.org/0000-0001-9193-8683
Sara El Yaagoubi https://orcid.org/0000-0003-1860-6433
Michel Sartori https://orcid.org/0000-0003-3397-3397
All of the data that support the findings of this study are available in the main text.