Platonova magna		Contents		Rev: 12/19/2023
		Classification		Biology and Ecology
		Morphology and Anatomy		Life Cycle
Return to Platonova Menu				Ecosystem Functions and Services
		Distribution		Management
Return to Leptosomatidae Menu		Feeding		References
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Classification:

Enoplea

  Enoplia
        Enoplida

            Ironina

                Ironoidea

                    Leptosomatidae

Synonchinae

                  

Platonova magna Mordukhovich, Semenchenko, Fadeeva & Zograf,  2019

Type species of the genus

    Synonyms:

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Morphology and Anatomy:

With general characteristics of the genus Platonova:

• Tail shape - conical anteriorly, filiform posteriorly
• Ocelli absent
•  division of pharyngostome into 2 distinct parts,
• one dorsal tooth in the anterior part of pharyngostome,
• 6 cuticular supports and microonchia in the posterior part of pharyngostome.
• Body large, cylindrical, tapering from about the level of the cardia towards the head
•  Cuticle thick, marked with fine transverse striations.
• Head bluntly rounded, with three rounded lips each bearing a pair of small conical labial papillae; Six outer labial setae and four cephalic setae in one circle,
•  There are two or three short setae about 60 um posterior to amphid and a few other short setae scattered posteriorly to about the level of the nerve-ring.
• Six posterior lobes present. Interlobar incisions wide, simple, without posteriorly-directed arms; posterior lobe margin smooth.
•  Amphids pocketshaped with relatively small aperture,
• Cheilostome with three complexes of fused mandibular ridges and 2 odontia
• Pharyngostome conical, anterior part with a large solid dorsal tooth, ventrosublateral teeth absent. The posterior part of pharyngostome with 6 cuticular beams (each 2 on the dorsal and two ventrosublateral sectors), and two ventrosublateral microonchia at about the level of the middle of the cuticular beams and dorsal microonchium at the base of cuticular beams
•  Dorsal pharyngeal gland lies in the center of the dorsal sector and opens into the posteriormost part of the buccal cavity
• Pharynx largely muscular, undivided, cylindrical, slightly tapered anteriorly. Renette absent.
• Lateral hypodermal chords with numerous large epidermal glands and loxometanemes of type I with caudal filaments (Fig. 9A–G). The ends of caudal filaments are often difficult to detect and exact number and length of metanemes cannot be determined.
• Tail conical anteriorly, filiform posteriorly, with scattered short setae. Caudal glands absent

Males:

• Diorchic with opposed testes in left position to the intestine.
• Spicules paired, fusiform, Capitulum wide, well-developed. Lamina with wide vellum.
• Gubernaculum composed of two symmetrical wings, joined together by one centered ventral piece, crura with membrane embracing the spicule and with ventral expansion of an intricate shape.

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Distribution:

Described from the eastern slope of the Kuril Islands and abyssal zone of the Northeastern Pacific, water depth 3374-5152 m

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Feeding:

Free-living marine nematodes.

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Biology and Ecology:

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Life Cycle:

Ecophysiological Parameters:

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Ecosystem Functions and Services:

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Management:

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References:

Mordukhovich, V.V., Semenchenko, A.A., Fadeeva, N.P., Zograf, J.K. 2019. One new genus and two new free-living deep-sea nematode species with discussion of phylogeny of the family Leptosomatidae Filipjev, 1916. Progress in Oceanography, 178: doi.org/10.1016/j.pocean.2019.102160

Platonova, T.A., 1970. On the Taxonomy of the Leptosomatidae (Nematoda) of the Mediterranean Sea and of the Adjacent Waters of the Atlantic [O sistematike Leptosomatidae (Nematoda) Sredizemnogo Morya i prilezhashchikh vod Atlantiki]. Zoologicheskii Zhurnal 49:1298-1305.

Platonova, T.A., 1979. Structure of the head end and system of the subfamily Synonchinae (Nematoda, Enoplida, Leptosomatidae) (Struktura golovnogo kontsa i sistema podsemeistva Synonchinae (Nematoda, Enoplida, Leptosomatidae)). Zoologicheskii Zhurnal 58 1117-1129.

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Copyright 1999 by Howard Ferris.
Revised: December 19, 2023.