Pseudostomella cheraensis   Priyalakshmi, Menon & Todaro,  2007 (Gastrotrich)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Gastrotricha
Class:
Order:Macrodasyida
Family:Thaumastodermatidae

Image copyright: Menon, NR; Priyalakshmi, G and Todaro, MA

Description
Size: 295 µm in total length.

Head with well-developed and extended pre-buccal apparatus (pb) incurving anteromedially, characterizing the genus Pseudostomella. Their dorsal margin project out a little beyond the ventral margin. Pre-buccal apparatus has five fleshy dorsal papillae ranging in length from 6 µm to12 µm, symmetrically arranged in 2+1+2 pattern. All papillae are with tactile cilia at the tip. Four to six smaller papillae are present along the ventral margin of the buccal palps, arranged in 2+2 or 3+3 pattern. Several sensory hairs (3µm) present on the outer lateral margins of pre-buccal apparatus among which, a longer one measured 16 µm. Sensory hairs or lateral bristles (10 µm long) of uncertain numbers seen on the lateral margins of the body as well.
Epidermal glands: Eight to nine pairs of granular epidermal glands arranged along the lateral margins of the body. Their size range between 7.5–10 µm × 7.5–15 µm. The middle glands located at 8 µm apart from each other.
Cuticular armature: The entire dorsal surface from the base of buccal apparatus to the pedicles covered by rows of closely packed pentancres with an average size of 3.5-5 µm. They are arranged in 13-14 longitudinal columns in the mid-trunk region with each column containing around 58 to 60 pentancres antero-posteriorly. The tines of the ancres project out almost masking the posterior border of the body. Adhesive tubes: 4 of the 6 anterior adhesive tubes seen ventrally at the base of the pre-buccal apparatus in 2+2+2 pattern measure 4 µm each. The remaining pair at the farthest end are longer. The number and pattern of anterior adhesive tubes seem to vary. In one of the paratypes, an additional pair is seen associated with the distal
pair, indicating variability in the number of anterior adhesive tubes. Eleven pairs of lateral adhesive tubes has an average length of about 7-8 µm. Of these, the anterior ten pairs are evenly spaced. The last pair is dorso-lateral in position. Pedicles (20 µm long) furnished with three distal tubes, the median one (8 µm) directed slightly dorsally, while the
others (5 µm) are directed slightly ventrally. Two posteriorly directed adhesive tubes, 8-9µ m long, are positioned at the base of the pedicles.
Ventral ciliation: Locomotory cilia form a continuous field of transverse rows from behind the margin of mouth and extent up to the caudal base.
Digestive system: The digestive tract begins with a terminal mouth, covered dorsally by a hood like extension and opens into the pharynx, behind the pre-buccal apparatus. The pharyngeal pores could not be located in the holotype but were seen at the base in the paratypes. The entire digestive tract not well discernable in the holotype. The intestine is broad anteriorly and narrows down posteriorly. The anus opens ventrally. Reproductive system: Simultaneous hermaphrodites. A single elongate testis on the right side (as seen from above) begins behind the pharyngeo-intestinal junction and leads caudally into a narrow elongate vas deferens. The caudal organ is pear shaped and is connected to a spherical frontal. The paratype showed two oval oocytes in the mid posterior body, of which the upper larger one measured 38×19 µm.

The description is based on an adult specimen


Synonym (s)

Common Name (s)
Economic Importance and Threats

Ecology
Habitat:  Sandy

Biogeography


• Kerala INDIA
• Kerala, Cherai Beach INDIA (Depth: 0.17 mts)

Literature Source(s)
  • Priyalakshmi, G and Menon, NR (2008) Indian marine Gastrotricha Available at - http://www.gastrotricha.unimore.it/Indian-marine.pdf
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Menon, NR; Priyalakshmi, G and Todaro, MA (2007) A new species of Pseudostomella (Gastrotricha: Macrodasyida: Thaumastodermatidae) from a sandy beach of Kerala, India Zootaxa Magnolia Press 1616 61–68 Available at - http://dyuthi.cusat.ac.in/xmlui/bitstream/handle/purl/1890/A%20new%20species%20of%20Pseudostomella%20%28Gastrotricha.pdf?sequence=1

Page last updated on:2010-12-27

Back to Search