Overview

Distribution

Biogeography

Palaearctis, marine and brackish water
Palaearctis
Nearctis

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Type locality: Not specified.

Reported for Baltic, Sea of Asow, Lake Baikal, Mediterranean Sea (Italy); Sea & pools with brackish water, S Finland; Nordish coast; Island Sylt, North Sea; Black Sea; Norway; East Europe; Finland; UK; NE Germany

Continental water: Pontic province, C Eur. plain, Ireland, NW Russian taiga; Romania.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Leasi, Francesca

Source: Marine Rotifera

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Physical Description

Morphology

Body vasiform in dorsal view; semiloricate. Body cavity with numerous light-refracting bodies, especially near gastric glands and nephridia. Head offset by neckfold, ± quadratic, dorsally with delicate transverse fold. Trunk broad elliptic; flattened ventrally, dorsally fairly arched; distal end variable: acute, blunt, rounded with lateral ± deep indentations, and all possible transitions between. Foot moderately long, c. 2/5-1/3 total length; 3 pseudosegments, terminal longest, with small joint between segment 2 and 3, median pseudosegment with dorsal transverse fold. Toes long, slender; inner margins straight, outer margins curved, tapering to acute points. Corona slightly oblique, lateral ciliary tufts absent. Brain large; Y-shaped retrocerebral duct distinct. Two large subcerebral glands. Two frontal eyespots, sometimes absent. A shallow constriction between stomach and intestine. Gastric glands small, pyriform, stalked. Pedal glands elongate or spherical, extending into trunk, ducts very long; 2 reservoirs in anterior half of terminal foot pseudosegment.

Rami asymmetrical, each with triangular basal part and rectangular, dorsally recurved anterior part with thin, finger-shaped projection on its free end; alulae acute; ventrally each ramus with at least 3 crenated crests, right largest; large, crenated basal apophyses; fenestrae on dorsal and caudal margins. Fulcrum rod-shaped in ventral view, slightly expanding posteriorly; in lateral view ± tapering to oblique end. Uncus with 4-5 clubbed teeth, gradually decreasing in size, smallest with lamella; principal teeth with prominence on ventral edge. Manubria long, left somewhat longer, posterior end incurved at a right angle; head with short posterior and longer anterior cavity.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Leasi, Francesca

Source: Marine Rotifera

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Size

Length: 135-180 µm, toe 18-22 µm; trophi 15-30 µm: ramus µm, fulcrum µm, uncus 9 µm, manubrium 12 µm.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Leasi, Francesca

Source: Marine Rotifera

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Type Information

Collection specimen

Non-type voucher specimen for Proales halophila Remane, 1929
Catalog number: 0316
Collection: Academy of Natural Sciences of Drexel University, Philadelphia, USA
Prepared by: Myers, F J
Sex/stage/structure: female
Preparation: Slide Preparation
Specimen Count: 1
Notes: marine; Original identification doubtful.

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Ecology

General Ecology

Ecology

In psammon and among algae; perennial, 1-22°C.

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Leasi, Francesca

Source: Marine Rotifera

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