Severianoia

 

Contents

  

Rev 07/25/2023

  Classification Biology and Ecology
Morphology and Anatomy Life Cycle
Return to Severianoia Menu Ecosystem Functions and Services
Distribution Management
Return to Thelastomatidae Menu Feeding  References
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Classification:

Chromadorea
                     Chromadoria

Thelastomatidae

Severianoia (Schwenck, 1926), Travassos, 1929

Type species of the genus: Severianoia severianoi Schwenk, 1926, Travassos, 1929

Synonym of type species:  Bulhoesia severianoi Schwenk, 1926

Synonym:

 Bulhoesia Schwenk, 1926

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Morphology and Anatomy:

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Females:

  • Mmouth opening surrounded by a circumoral cuticle plate, eight labial sensilla situated as two subdorsal, two subventral and four sublateral in position present.
  • Amphids slit-like
  • Buccal cavity with one dorsal and two subventral cuticular projections.
  • Pharynx with well-defined clavate corpus, an indistinct isthmus and rounded basal bulb. 
  • Excretory pore situated posterior to basal bulb.
  • Didelphic, amphifelphic; vulva at mid-body.
  •  Eggs thin-shelled, with longitudinal ridges.
  • Tail conical or attenuated.

Males:

  • In males, oral opening triangular and pharyngeal corpus cylindrical. Intestine straight, narrowing posteriorly.Single spicule.
  • Gubernaculum absent.
  • Four pairs of genital papillae arranged as one precloacal and three postcloacal pairs, of which one pair is lateral in position.
  • Lateral alae absent.
  • Tail of male conical with narrow terminal tip.

Ref:  Malysheva et al., 2021
Body size range for the species of this genus in the database - Click:

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Distribution:

Severanoia spp have been described from the intestine of various cockroach species in the families Blattidae and Blaberidae (Hexapoda: Insecta: Blattoidea) and from millipedes of the Julidae, Glomeridae and Paradoxosomatidae (Myriapoda: Diplopoda).  As an example, Severianoia pachyiuli was described from the posterior gut of Pachyiulus krivolutskyi Golovatch, 1977 (Myriapoda: Diplopoda: Julidae) collected near the Gruzinka River in the vicinity of Nickel village, Republic of Adygea, Russian Federation (Malysheva et al., 2021).

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Feeding:

A genus of intestinal parasites of millipedes and cockroaches.

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Biology and Ecology:
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Life Cycle:

For Ecophysiological Parameters for this genus, click 
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Ecosystem Functions and Services:

 

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Management:

 

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References:

Malysheva, S.V., Shmatko, V.Y., Spiridonov, S.E. 2021. Revision of Severianoia (Schwenk, 1926) Travassos, 1929 (Nematoda: Oxyuridomorpha) with proposal of S. pachyiuli n. sp. from millipedes of the Western Caucasus. Nematology 23: 467-481.

Schwenk, J. 1926. Fauna parasitologica dos blattideos do Brasil. Sciencia Medica 4:491-504.

Travassos, L. 1929. Contribuicao preliminar á systematica dos nematodeos dos artropodos. Memorias do Instituto Oswaldo Cruz 5, 19-25. DOI: 10.1590/S0074-02761929000200004

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Copyright © 1999 by Howard Ferris.
Revised: July 25, 2023.