Discovering unknown Madagascar biodiversity: integrative taxonomy of raft spiders (Pisauridae: Dolomedes)

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Zoological Science

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Introduction

Materials and Methods

Taxon sampling

Anatomical examination

Integrative taxonomy

Morphological comparisons and dispersal-related traits

Molecular phylogeny and species delimitation

Habitat preferences estimation and geological barriers

Nomenclatural acts

Results

Morphological comparisons

Somatic characters

Male genital characters

Female genital characters

Morphometric summary

Phylogenetic and species delimitation analyses

Habitat preferences and geological barriers

Discussion

Taxonomy

Family Pisauridae Simon, 1890

Dolomedes Latreille, 1804

  • 1) The presence of Sa, a round shaped and sclerotized part of upper T. This structure is considered as a reduced DTA in Santos (2007) cladistic analyses (Fig. 18, red arrow).

  • 2) The presence of LA, which originated from the DST together with the Eb and Fu (Fig. 19).

  • 1) Small knob, bulb, or horn shaped HS, which is also called AB (Figs. 20A20E, red arrows). HS in other pisaurids is usually extended and elongated.

  • 2) Relatively long and usually vertically coiled FD that starts with a tubular part and ends with a flat flake (Figs. 20A20E).

Key to known Dolomedes species of Madagascar

  • 1) Large and long-legged Dolomedes, female carapace width above 7 mm, and male carapace width above 6.5 mm (Fig. 2). Habitus uniformly brown to dark brown with light-colored, but usually indistinct, margins (Figs. 22A22F). A few individuals have distinct but thin white lateral bands that do not expand to the edge of the carapace (Figs. 22G22I): “Kalanoro” group

    Female…………………………………………………………………………………….2

    Male………………………………………………………………………………………4

    Small and short-legged Dolomedes, female carapace width below 7 mm, and male carapace width below 6.5 mm (Fig. 2). Habitus dark brown to black with distinctively broad white lateral bands that expand to the edge of the carapace (Figs. 22I22M): “Hydatostella” group

    Female…………………………………………………………………………………….6

    Male………………………………………………………………………………………7

  • 2) Epigynum MF with a horn extension (Figs. 9A, 14, 20F): D. kalanoro Silva & Griswold, 2013

    Epigynum MF without a horn extension (Figs. 9A, 14, 20G and 20H) ………………3

  • 3) Epigynum MF long and narrow; CD long and connected to the BS ventrally; AB laterally positioned (Figs. 9A, 14, 20B): D. gregoric sp. nov.

    Epigynum MF short and wide; CD short and connected to the BS anteriorly; AB anteriorly positioned (Figs. 9A, 14, 20C): D. bedjanic sp. nov.

  • 4) Palp long, over twice the carapace width (Fig. 2H); Cy shorter than the palp tibia (Fig. 5B); RTA dorso-laterally positioned (Fig. 18G) without a dorsal lobe (Figs. 8A, 13, 21C); MA with a broad base (Figs. 6A, 13, 18C); Eb short (Figs. 4A4B, 12, 19C), De below 1.0 (Fig. 5A); LA with a broad tip (Figs. 3A, 12, 19C): D. bedjanic sp. nov.

    Palp shorter than twice the carapace width (Fig. 2H); Cy longer than the palp tibia (Fig. 5B); RTA laterally positioned with a dorsal lobe (Figs. 8A, 13, 21A and 21B); MA with a narrow base (Figs. 6A, 13, 18A and 18B); De above 1.0 (Fig. 5A); LA with a narrow tip (Figs. 3A, 12, 19A and 19B) …………………………………………………5

  • 5) Embolus long with a narrow base (Figs. 4A and 4B, 12, 19A), De above 1.2 (Fig. 5A); Cy large, at least 1.2 times longer than the palp tibia (Fig. 5B); MA expands gradually from the base to the middle part (Figs. 6A, 13A, 18A); LA with a straight section at the base of the dorsal edge (Figs. 3A, 12, 19A): D. kalanoro Silva & Griswold, 2013

    Embolus long with a broadened base (Figs. 4A4B, 12, 19B), De between 1.0 and 1.2 (Fig. 5B); MA distinctly expands at the middle part (Figs. 6A, 13, 18B); LA without a straight section at the base of the dorsal edge (Figs. 3A, 12, 19B): D. gregoric sp. nov.

  • 6) Epigynum pentagon-shaped with short EFs, posterior MF relatively long (Figs. 9B, 14, 20I): D. hydatostella sp. nov.

    Epigynum round or triangular shaped with long EFs that extend to near the anterior edge of the epigynum; posterior MF relatively short (Figs. 9B, 14, 20J): D. rotundus sp. nov.

  • 7) Dorsal and ventral lobes of RTA similar sized (Figs. 8B, 13, 21D); In the ventral view, retrolateral arc of the Eb straight (Figs. 4B, 13, 18D); LA with a distinct narrow base (Figs. 3B, 12, 19D): D. hydatostella sp. nov.

Species group “Kalanoro”

Dolomedes kalanoro Silva & Griswold, 2013

Dolomedes gregoric Yu & Kuntner sp. nov.

Dolomedes bedjanic Yu & Kuntner sp. nov.

Species group “Hydatostella”

Dolomedes hydatostella Yu & Kuntner sp. nov.

Dolomedes rotundus Yu & Kuntner sp. nov.

Supplemental Information

Retrolateral view of the right distal sclerotized tube of male Dolomedes kalanoro da Silva & Griswold, 2013 (KPARA00185), showing the examples of landmark positions.

(A) Embolus, the gray lines represent the reference lines for landmarks plotting, the red line represent the diameter of embolic ring (De). (B) Fulcrum. (C) Lateral subterminal apophysis. The black arrow showing the dorsal direction.

DOI: 10.7717/peerj.16781/supp-1

The left palp of male Dolomedes kalanoro da Silva & Griswold, 2013 (KPARA00185), showing examples of landmark positions.

(A) Median apophysis, ventral view. (B) Embolus, ventral view. (C) Fulcrum, dorsal view. (D) retrolatateral tibial apophysis, posterolateral view.

DOI: 10.7717/peerj.16781/supp-2

The epigynum of Dolomedes kalanoro da Silva & Griswold, 2013 (KPARA00193), showing examples of landmark positions.

A) Epigynal margin, ventral view. (B) Epigynal middle field, ventral view. (C) Vulva arrangement, dorsal view.

DOI: 10.7717/peerj.16781/supp-3

Examples of the four habitat categories used in the study.

(A) The pond at the countryside of Sambava, represents standing water with an open canopy. (B) Understory swamps at Parc National de Marojejy, represent standing water with dense canopy. (C) The river along Circuit Tsakoka, Parc National d’Andasibe-Mantadia, represents flowing water with an open canopy. (D) The stream at Parc National de Marojejy, represents flowing water with a dense canopy.

DOI: 10.7717/peerj.16781/supp-4

The Mantispidae larva found in the epigastric furrow of a female Dolomedes bedjanic sp. nov. (KPARA00144).

(A–B) Parasitized epigynum: (A) Ventral view; (B) dorsal view, showing the deformed vulva. (C–D) The Mantispidae larva: (C) Dorsal view; (D) lateral view.

DOI: 10.7717/peerj.16781/supp-5

Descriptions of the landmarks selected within each structure.

RTA: retrolateral tibial apophysis, LA: lateral subterminal apophysis.

DOI: 10.7717/peerj.16781/supp-6

GenBank accession numbers of the COI sequences included in this study.

DOI: 10.7717/peerj.16781/supp-7

Results of the one-way analyses of variance showing the measurements of the six selected structures are significantly different among the five morphospecies in both sexes.

De: diameter of embolic ring; Df: degrees of freedom; SS: sum of square; MS: mean square; significance threshold: p-value < 0.05

DOI: 10.7717/peerj.16781/supp-8

Pairwise comparisons in measurements of the six selected structures between all pair combinations of the five morphospecies.

De: diameter of embolic ring; diff: difference between means of the two groups; lwr: lower end point of 95% confident interval; upr: upper end point of 95% confident interval; significance threshold: p-value < 0.05; significant p-value were in bold.

DOI: 10.7717/peerj.16781/supp-9

Proportion and cumulative variances in the shape components of each selected structure explained by the first five principal component axes (PC).

RTA: retrolateral tibial apophysis, LA: lateral subterminal apophysis.

DOI: 10.7717/peerj.16781/supp-10

List of collecting information and the deposition of the specimens examined in this study.

NIB: National Institute of Biology, Ljubljana, Slovenia; RMCA: Royal Museum for Central Africa, Tervuren, Belgium; SMF: Senckenberg Natural History Museum, Frankfurt, Germany; USNM: National Museum of Natural History, Smithsonian Institution, Washington, DC, USA; Sub: Sub-adult; F: Female; M: Male; J: Juvenile

DOI: 10.7717/peerj.16781/supp-11

Raw data and code for analyses performed in this study.

The raw measurements, landmark coordinates, and the R code for morphological analyses. An aligned COI matrix is also included.

DOI: 10.7717/peerj.16781/supp-12

Additional Information and Declarations

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Kuang-Ping Yu conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the article, and approved the final draft.

Matjaž Kuntner conceived and designed the experiments, performed the experiments, authored or reviewed drafts of the article, and approved the final draft.

Field Study Permissions

The following information was supplied relating to field study approvals (i.e., approving body and any reference numbers):

Direction of Protected Airs, Renewable Nature Resources and Ecosystems

DNA Deposition

The following information was supplied regarding the deposition of DNA sequences:

The COI sequences used in the study are available in the Supplemental File and at GenBank: OR284697 to OR284754.

Data Availability

The following information was supplied regarding data availability:

The details in the methodology, raw data matrices and R codes for morphometric analyses, the list of specimens and their deposition, as well as the aligned COI matrix, are available in the Supplemental Files, tables, and figures.

New Species Registration

The following information was supplied regarding the registration of a newly described species:

Publication LSID: urn:lsid:zoobank.org:pub:C9091268-EC61-41CD-A20C-5C7DC08DAD46.

Dolomedes bedjanic: urn:lsid:zoobank.org:act:081004EB-ED43-4BA1-9AB9-C7DCE95BB338.

Dolomedes gregoric: urn:lsid:zoobank.org:act:075EEA19-43F1-4B65-97CC-5E014CE4D22C.

Dolomedes hydatostella: urn:lsid:zoobank.org:act:6C524835-816A-42F8-8700-BF1A597F8ED9.

Dolomedes rotundus: urn:lsid:zoobank.org:act:03ADE51C-2B73-4F7F-B2BD-61755461912C.

Funding

Matjaž Kuntner and Kuang-Ping Yu were supported by the Slovenian Research and Innovation Agency (grants P1-0255; J1-9163). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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