Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus

  • Sven Boström Swedish Museum of Natural History
  • Oleksandr Holovachov Swedish Museum of Natural History
DOI: https://doi.org/10.5852/ejt.2014.87
Keywords: morphology, new species, SEM, Stegelleta, taxonomy

Abstract

Populations of Stegelleta are described from California, New Zealand and Senegal. An amphimictic population from California is identified as belonging to S. incisa and compared with type specimens from Utah and an amphimictic population from Italy. One population from New Zealand is close to S. incisa but considered to represent a new species, Stegelleta laterocornuta sp. nov. It is particularly characterised by a 379–512 μm long body in females and 365–476 μm in males; cuticle divided into 16 rows of blocks at midbody (excluding lateral field); lateral field with four incisures; three pairs of asymmetrical lips, U-shaped primary axils without guarding processes, each lip asymmetrically rectangular with a smooth margin, only lateral lips have slender acute tines; three labial probolae, bifurcated at half of their length; vulva without flap; spermatheca 17–31 μm long; postuterine sac 7–24 μm long; spicules 21.5–23.5 μm long. Other specimens from New Zealand are identified as belonging to S. tuarua. A parthenogenetic population from Senegal is identified as belonging to S. ophioglossa and compared with type specimens from Mongolia and records of several other populations of S. ophioglossa. The generic diagnosis is emended and a key to the species of Stegelleta is provided.

Author Biographies

Sven Boström, Swedish Museum of Natural History
Department of Zoology, Swedish Museum of Natural History, Box 50007,
SE-104 05 Stockholm, Sweden
Oleksandr Holovachov, Swedish Museum of Natural History
Department of Zoology, Swedish Museum of Natural History, Box 50007,
SE-104 05 Stockholm, Sweden

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Published
2014-06-16
How to Cite
Boström, S., & Holovachov, O. (2014). Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus. European Journal of Taxonomy, (87). https://doi.org/10.5852/ejt.2014.87
Issue
No. 87 (2014): Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus
Section
Zoology
Copyright (c) 2014 Sven Boström, Oleksandr Holovachov

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