Tardigrades of North Carolina
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View PDFDoryphoribiidae Members: 121 NC Records

Grevenius kenodontis (Kendall-Fite & Nelson, 1996) - No Common Name


Habits, lateral, PC
Taxonomy
Class: EutardigradaOrder: Parachela Family: Doryphoribiidae Checklist Number: 1590.0 Synonym: Isohypsibius kenodontis, Isohypsibius n. sp. 1 (see Bartels et al. 2021)
Taxonomic Comments: Transferred from Isohypsibius by Gasiorek et al. 2019. No molecular data.
Species Notes: Freshwater. Known only from Costa Rica, and the Smokies in USA.
Identification
Online resources:Online Photographs: Google, GBIF                                                                                 
Species Description: Body length 385 µm. Eyespots present. Colourless cuticle, with an irregular polygonal network of partially fused granules on dorsal and lateral surfaces, not extending to the ventral surface, and on legs IV at the base of the claws. Indentations on the anterior margin of the small buccal ring may give the false appearance of short lamellae. Buccal armature without transverse crests or mucrones; however, there is a slight thickening at the top of the stylet sheath. Dorsal and ventral crests present on buccal tube for stylet muscle insertion. Buccal tube narrow, 4.0 µm wide (external, at insertion of stylet supports) by 36.0 pm long; pt ratio = 11.1. Length of buccal tube from top of stylet sheaths to insertion of stylet supports 27.5 µm. Pharyngeal bulb spherical, with two thin cuticular bars between apophyses and first macroplacoids. Large apophyses, triangular in lateral view; 2.5 µm in length. Three blunt rod-shaped macroplacoids; first 3.0 µm long, second 2.5 µm and third 3.5 µm; first and second may appear partially connected, second and third clearly separate. Placoid row slightly curved; length 12.5 pm. No microplacoid or septulum. Isohypsibius-type claws, 2-1-2-1 sequence. Primary branch and basal tract of external claw are longer and more slender than those of internal claw on legs I-IV, especially on legs IV. On leg IV posterior claw 2 1.0 µm; anterior, 15.5 µm. On leg 111, external claw 17.5 µm; internal, 1 1.0 µm. No lunules, but external claw has expanded base. Short accessory points, poorly developed, on primary branch of claws. No cuticular bars.
-Kendall-Fite & Nelson 1996
Body Length: up to 385 microns
Key Characters: Three rows of macroplacoids (length 1=2<3), cuticle with reticulations but no granules and no gibbosities.
Key Character Images
ID Requirements: Identifiable only by close inspection of key characters or by DNA analysis.
Distribution in North Carolina
Distribution:
County Map: Clicking on a county returns the records for the species in that county.
Dates:
 High Mountains (HM) ≥ 4,000 ft.
 Low Mountains (LM) < 4,000 ft.
 Piedmont (Pd)
 Coastal Plain (CP)

Click on graph to enlarge
Habitats and Life History
Habitats: Freshwater streams.
Abundance: Abundant. This species makes up 8.34% of aquatic specimens collected in the Great Smoky Mountains National Park in Bartels' inventory.
Diet: Unknown, possibly omnivorous.
Reproduction: Smooth eggs laid in shed exuvium.
Observation Methods: PC and DIC microscopy.
Wikipedia

 Photo Gallery for Grevenius kenodontis - No common name

Photos: 7

Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Pharynx and placoids, PC		Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Anterior, PC
Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Claws, PC		Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Lateral, PC
Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Dorsal cuticle showing reticulations		Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Habits, lateral, PC
Recorded by: Bartels on 2002-11-23
Haywood Co.
Comment: Drawing from Kendall-Fite & Nelson 1996