Marine gastrotrichs from the sand beaches of the northern Gulf of Mexico: species list and distribution

 Abstract Guidi, L., Pierboni, L., Ferraguti, M., Todaro, M.A., Balsamo, M. Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane 1927. -Acta Zoologica (Stockholm) 85 : 211-221The spermatozoa of Lepidodasys unicarenatus and Lepidodasys sp. are filiform and composed of a cork-screw shaped acrosome, a helical nucleus surrounding a mitochondrial axis, and a 9 × 2 + 2 flagellum as in the basic structural model of the macrodasyidan sperm. The genus Lepidodasys has a debated phylogenetic position and has been linked in turn to the family Lepidodasyidae and the family Thaumastodermatidae. The sperm features of the two Lepidodasys species examined are distinct from those typical of the two families: the absence of the periaxonemal cylinder, a character shared only with Turbanellidae among Macrodasyida, could be considered as a symplesiomorphy, suggesting a basal position of the genus along the Macrodasyida clade. Moreover, a comparison of the spermatogenic process of Lepidodasys sp. with those of Acanthodasys aculeatus (Thaumastodermatidae) and Cephalodasys maximus (Lepidodasyidae) has revealed that the process of acrosome formation and nuclear morphology during spermatogenesis are peculiar in Lepidodasys sp. and differences are evident especially in the late stages of spermatogenesis. Penetrated spermatozoa were observed in the oocytes at all maturation stages in L. unicarenatus.

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“…were collected on 25 September 1994 from the shallow sublittoral of Panama City beach, Florida, US (cf. Todaro et al . 1995).…”

Section: Methodsmentioning

confidence: 99%

“…In this study, we compare the spermatozoa of two species of Lepidodasys , L. unicarenatus Balsamo, Fregni & Tongiorgi, 1994 and Lepidodasys sp. (cf Todaro et al . 1995), with those of other macrodasyidans to gain insight on the phylogenetic position of the genus.…”

Section: Introductionmentioning

confidence: 99%

Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927

et al. 2004

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“…The genus Lepidodasys consists of eight described species and several undescribed specimens from marine waters across the globe (see Hummon 2009), from as far north as the Faroe Islands (Clausen 2004) to locations along the European coastline (e.g., Remane 1926; Fregni et al 1999; Clausen 2000; Hummon 2009) including the Baltic and Mediterranean seas (Roszczac 1939; Balsamo et al 1994; Hummon 2009), to the Pacific waters of Japan (Lee and Chang 2011) and Hawaii (Hummon 2009), and to the Caribbean waters of Panama (Hochberg and Atherton 2011) and the Gulf of Mexico (Todaro et al 1995). …”

Section: Taxonomic Remarksmentioning

confidence: 99%

A new species of sublittoral marine gastrotrich, Lepidodasys ligni sp. n. (Macrodasyida, Lepidodasyidae), from the Atlantic coast of Florida

Hochberg¹,

Atherton²,

Gross³

2013

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A new species of Lepidodasys is described from sublittoral sandy sediments off the Atlantic coast of Florida. Lepidodasys ligni sp. n. is a small species (≤ 450 µm) with a crossed-helical pattern of small, non-keeled, non-imbricated scales on the dorsal and lateral body surfaces, two columns of ventral, interciliary scales that form a herringbone pattern, and a series of anterior, lateral, dorsal and posterior adhesive tubes. Similar to Lepidodasys castoroides from the Faroe Islands, the new species possesses a caudal constriction that demarcates the posterior end containing the caudal organ. The frontal organ lies within the posterior constriction, which is heavily invested with somatic circular muscles. These muscles are also present throughout the trunk and represent a novel condition for species of Lepidodasys,which were previously considered to lack somatic circular muscles. Posterior of the caudal constriction is a large, barrel-shaped caudal organ that is wrapped in a series of interdigitating, spindle-shaped, incomplete circular muscle fibers. The caudal organ contains a sclerotized central canal, but the absence of distal cuticular endpieces distinguishes the new species from its morphologically similar congener, Lepidodasys castoroides.

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“…This attests to the apparent cosmopolitanism (or complexes of sibling species?) that is common to fresh-water and marine Gastrotricha (Todaro et al 1995(Todaro et al , 1996Strayer & Hummon 2001;Todaro & Rocha 2004). To date, P. rhomboides is the most geographically dispersed species in the genus, known from all continents except Antarctica, followed by P. nodicaudus, known from all continents except Antarctica and Africa.…”

Section: Polymerurus From Australia 125mentioning

confidence: 99%

First record of Polymerurus (Gastrotricha, Chaetonotida) from Australia with the description of a new species from Queensland and of cuticular ultrastructure in P. nodicaudus

Hochberg

2005

Invertebrate Biology

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Abstract. Identification of specimens in the genus Polymerurus (Gastrotricha, Chaetonotida) is reported for the first time from Australia. The genus includes 3 species from a freshwater lake in southern Queensland. Two species, Polymerurus rhomboides and P. nodicaudus, are well-known cosmopolitans: P. rhomboides is now known from every continent except Antarctica, and P. nodicaudus from all continents except Africa and Antarctica. An ultrastructural description of the cuticle in P. nodicaudus is provided and confirms earlier observations on the structure of spined scales in other species of Chaetonotida, suborder Paucitubulatina. The utility of cuticle ultrastructure is discussed in reference to the search for characters defining higher-level taxa in the Paucitubulatina. A new species, P. andreae, also cohabits the Queensland lake and is distinguished by the following combination of characters: wide mouth ring; pharynx with terminal bulb; simple spineless scales on the dorsal, lateral, and ventrolateral body surfaces; and a column of ventral interciliary scales in rectangular, ovoid, and intermediate shapes.

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Marine gastrotrichs from the sand beaches of the northern Gulf of Mexico: species list and distribution

Cited by 34 publications

References 24 publications

Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927

Spermatology of the genus Lepidodasys Remane, 1926 (Gastrotricha, Macrodasyida): towards a revision of the family Lepidodasyidae Remane, 1927

A new species of sublittoral marine gastrotrich, Lepidodasys ligni sp. n. (Macrodasyida, Lepidodasyidae), from the Atlantic coast of Florida

First record of Polymerurus (Gastrotricha, Chaetonotida) from Australia with the description of a new species from Queensland and of cuticular ultrastructure in P. nodicaudus

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