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Open research questions in Subterranean biodiversity and taxonomy

45 unresolved questions extracted from the limitations and future-work sections of 275 Subterranean biodiversity and taxonomy papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • The difficulty in accessing and studying subterranean fauna. The challenge of describing and distinguishing new species. The need for further research on the ecology and conservation of cave-adapted ground beetles.

    A new species of the subterranean genus Zhijinaphaenops Uéno, 2002, from a Karst Cave in Guizhou, China (Coleoptera: Carabidae: Trechini) · 2026 · DOI

  • The lack of recent collections and verified in situ observations. The difficulty of studying mesophotic ecosystems. The need for further research on the phylogeny of Syngnathidae.

    Australyichthys gen. nov. (Teleostei, Syngnathidae), a lost mesophotic lineage from southern Australia, with description of A. aegis sp. nov. and reclassification of Hippocampus minotaur and H. paradoxus · 2026 · DOI

  • The difficulty of accessing and exploring the marine cave habitat. The lack of quantitative ecological data on the species.

    Hidden in the dark: A new record and species of cave-dwelling Palaumysis (Crustacea, Mysidacea) from Sipadan Turtle Tomb, Malaysia, with identification keys to world species · 2026 · DOI

  • macula reflects natural phenotypic plasticity, as seen in other arthropods (Schielzeth & Dieker 2020), or results from differences in diet, habitat, or a combination of these factors, remains an open question that merits further study. This strongly suggests that further undescribed taxa remain to be discovered.

    Descriptions of two new species and a new record of the giant pill-millipede genus Zephronia Gray, 1832 from Thailand (Diplopoda, Sphaerotheriida, Zephroniidae) · 2026 · DOI

  • Further investigation of the sensitivity of the ecosystem stability toward changes in predation efficiency. Application of the model to other ecosystems with similar characteristics. Experimental validation of the model's predictions.

    Dynamical Analysis of a Trophic Model on Guano, Invertebrates, and Fish in Cave Ecosystems · 2026 · DOI

  • The lack of understanding of the dynamical interaction between guano biomass density, invertebrate biomass density, and fish biomass density in cave ecosystems. The need to develop a model that represents the nutrient-based cave ecosystem.

    Dynamical Analysis of a Trophic Model on Guano, Invertebrates, and Fish in Cave Ecosystems · 2026 · DOI

  • The lack of knowledge on the diagnostic features of the Cyprettadopsini. The need for an update of the distinguishing features and a key to the genera of the Cyprettadopsini.

    Three new species of Cyprettadopsini of subfamily Cypridopsinae (Crustacea: Ostracoda) from Northeast Thailand with discussion on characters in the tribe · 2026 · DOI

  • The current classification of Laelaps is based on conserved morphological characters, which may not reflect evolutionary history. There is a lack of molecular evidence for the monophyly and cosmopolitan status of Laelaps.

    Molecular evidence of rodent-associated mites tests the monophyly and challenges the cosmopolitan status of <i>Laelaps</i> Koch, 1836 (Mesostigmata: Laelapidae) · 2026 · DOI

  • The previous publication contained errors that needed to be corrected. The corrections are necessary for the accurate identification of Geophilus species.

    Corrigendum: Popovici G, Popa OP, Iorgu EI (2026) Integrative taxonomy uncovers hidden diversity in Romanian Geophilus Leach, 1814 (Geophilomorpha, Geophilidae). Zoosystematics and Evolution 102(2): 533–555. https://doi.org/10.3897/zse.102.177928 · 2026 · DOI

  • The lack of knowledge on the diversity of subterranean fauna. The need for further research on cave-adapted ground beetles. The gap in the understanding of the subterranean genus Zhijinaphaenops.

    A new species of the subterranean genus Zhijinaphaenops Uéno, 2002, from a Karst Cave in Guizhou, China (Coleoptera: Carabidae: Trechini) · 2026 · DOI

  • Additional molecular data and comprehensive phylogenetic studies to reassess the circumscription and evolutionary relationships of Pararamichloridiales. Further exploration of the diversity and classification of aquatic fungi.

    Hyalosympodium gen. et sp. nov. (Pararamichloridiales, Diaporthomycetidae) from freshwater habitats in Guizhou, China · 2026 · DOI

  • Further study of the abundance, trophic role, and seasonal persistence of Palaumysis jetama sp. nov. Exploration and documentation of the marine biodiversity of Sipadan Island.

    Hidden in the dark: A new record and species of cave-dwelling Palaumysis (Crustacea, Mysidacea) from Sipadan Turtle Tomb, Malaysia, with identification keys to world species · 2026 · DOI

  • To account for this unexpectedly high species richness in the Serra de Iuiú region, we propose three non-mutually exclusive hypotheses which, although preliminary, provide plausible explanations and warrant further investigation: (i) the presence of geographic barriers; (ii) limited dispersal capacity; and (iii) competitive exclusion. As competition increases, it may lead to competitive exclusion, a mechanism rarely examined in subterranean habitats but already documented in cave systems (Martins & Ferreira 2020).

    Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid. · 2026 · DOI

  • The study is limited by the small number of specimens available. The lack of recent collections and verified in situ observations limits the understanding of the genus. The study is based on incidental collections and may not be representative of the entire genus.

    Australyichthys gen. nov. (Teleostei, Syngnathidae), a lost mesophotic lineage from southern Australia, with description of A. aegis sp. nov. and reclassification of Hippocampus minotaur and H. paradoxus · 2026 · DOI

  • Collected primarily during intensive field expeditions between 1991 and 2010, subterranean samples from the archipelago’s diverse cave systems and mesovoid habitats form a vast assemblage of specimens — most of which remain unidentified — that illuminate the region’s hidden and understudied biodiversity.

    Insights from the Dalberto Teixeira Pombo (DTP) Arthropod Collection – I. Revealing the Hidden Diversity of Terrestrial Cave Arthropods in the Azores · 2025 · DOI

  • The authors note that genes with altered expression in cave Astyanax populations show evidence of standing genetic variation (rare variants present in ancestral surface populations). While identical SNP markers have been documented in multiple cave populations, systematic genome-wide comparison of standing genetic variation between different independently evolved cave populations versus newly arising mutations remains incomplete.

    Cavefishes · 2018 · DOI

  • The paper demonstrates that reduced sleep duration in cavefishes—characterized by frequent brief sleep bouts lasting only minutes—resembles human insomnia patterns. However, the specific genes responsible for this altered sleep architecture in cavefishes have not been identified, limiting the translational potential for human sleep disorder research despite the acknowledged opportunity.

    Cavefishes · 2018 · DOI

  • The lat- ter comprised specimens from two localities, one in Cambodia (type locality) and the other in Vietnam, corresponding to distinct but sister MOTUs as delimited by all six delimitation methods, except mPTP.

    An updated phylogeny of the family Stenasellidae (Crustacea, Isopoda), with a new species of Stenasellus from southern Vietnam · 2026 · DOI

  • Further studies on the diversity of Zephronia in Thailand. Investigation of the biogeographical connectivity between Thailand and Vietnam.

    Descriptions of two new species and a new record of the giant pill-millipede genus Zephronia Gray, 1832 from Thailand (Diplopoda, Sphaerotheriida, Zephroniidae) · 2026 · DOI

  • The need to identify and describe new species of algae. The lack of molecular and morphological data for some species.

    Molecular and morphological systematic investigation of Chondrophycus minutus sp. nov. (Ceramiales, Rhodophyta) from India · 2026 · DOI

  • Further study of Geophilus species is needed. The corrections provided in this paper can be used as a basis for future research.

    Corrigendum: Popovici G, Popa OP, Iorgu EI (2026) Integrative taxonomy uncovers hidden diversity in Romanian Geophilus Leach, 1814 (Geophilomorpha, Geophilidae). Zoosystematics and Evolution 102(2): 533–555. https://doi.org/10.3897/zse.102.177928 · 2026 · DOI

  • The prior work did not subdivide the Vysotinsky regional stage of the Givetian in detail. The study aims to fill this gap.

    Subdivision of the Lower and Middle Givetian deposits of the Vysotinsky regional stage by conodonts in the Pokrovskoye section (Middle Urals) · 2026 · DOI

  • Limited availability of sequence data for several related taxa. Insufficient taxon sampling across the group.

    Hyalosympodium gen. et sp. nov. (Pararamichloridiales, Diaporthomycetidae) from freshwater habitats in Guizhou, China · 2026 · DOI

  • Further study of the diversity of Pseudochthonius in Brazil. Investigation of the ecological and conservation implications of the findings.

    Remarkable micro-endemism and high congeneric richness: eight new cave-restricted species of Pseudochthonius Balzan, 1892 (Pseudoscorpiones, Chthoniidae) from the Brazilian semi-arid. · 2026 · DOI

  • Decapod lobsters of the family Erymidae are important components of Middle–Upper Jurassic marine ecosystems, yet their fossil record in the Lesser Caucasus remains sparse.

    New record of Eryma (Crustacea, Decapoda) from the Middle Jurassic (Bathonian) of NE Armenia · 2025 · DOI

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45 open questions have been extracted from the limitations and future-work passages of 275 Subterranean biodiversity and taxonomy papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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