Gieysztoria evelinae ( Marcus, 1946 ) Luther, 1955
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publication ID |
https://doi.org/ 10.6620/ZS.2021.60-22 |
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persistent identifier |
https://treatment.plazi.org/id/7B330457-FFFC-987C-A37B-7A5AC25DD666 |
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treatment provided by |
Felipe |
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scientific name |
Gieysztoria evelinae ( Marcus, 1946 ) Luther, 1955 |
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Gieysztoria evelinae ( Marcus, 1946) Luther, 1955 View in CoL
( Fig. 7A–C View Fig )
Synonym: Microdalyellia evelinae Marcus, 1946 .
Studied material: A single individual studied alive, afterwards whole mounted in Hoyer’s medium (MZUSP PL 2236).
Localities: Sites 3 (18/02/2019), associated with phytal microhabitat.
Description: The body is 0.9 mm long and 0.2 mm wide; anterior end bluntly rounded, caudal end pointed, tail-like shape; brownish-orange pigmentation concentrated especially behind the pharynx. Two black bean-like eyes located at the anterior region of the body. The pharynx is 137.2 μm long and 111.2 μm wide. Two dorsal feathery vitellaria (357.9 μm long) with finger-like prolongations ( Fig. 7A View Fig ). The male reproductive system comprised by two rear lateral testes, seminal vesicle (60.7 μm long, 95.4 μm wide), prostatic vesicle (60.4 μm long, 88.3 μm wide) and a penis stylet ( Fig. 7B View Fig ). The penis stylet is 72.9 µm in total length, with a dorsal opened girdle and distal spines. The girdle is composed by a proximal ring (24.77 μm in height and 47.61 μm in width) united by bridges (5.4 μm in height) to a distal ring ( Fig. 7C View Fig 1 View Fig ). The distal ring bears spines that are composed of two different groups. The first group is composed of four hollow well-developed spines (41.7 μm, n = 4, length) with a broad triangular slightly outward-curved base (18.4 μm, n = 1, width) ( Fig. 7C View Fig 1 View Fig , C 4 View Fig ). The second group bears five to seven thin fine spines (39.7 μm, n = 7, length) with its distal tip slightly curved outward, located interspersed with the first group of spines and are connected by its base to the distal ring ( Fig. 7C View Fig 1–2 View Fig View Fig ). The female reproductive system is composed of a saccular ovary (113.7 µm long), a seminal receptacle, uterus and a copulatory bursa. Male and female reproductive systems discharge into the common genital pore which is located at the posterior 1/3 of the body.
Taxonomic remarks: The above-mentioned features follow descriptions given by Marcus (1946) and Brusa et al. (2008). The body length (1700 µm) of the original description ( Marcus 1946) is bigger than specimens from the ESEC Taim. Our specimens are bigger than those found in Argentina (483–583 µm) ( Brusa et al. 2008). However, the total length of the stylet of our findings (72.9 µm) is smaller than those from Argentina (90–100 µm) ( Brusa et al. 2008) and São Paulo (90–100 µm) ( Marcus 1946). The same trait is observed when comparing the length of distal spines, which are 50-60 μm and 60 μm for Argentinian and Brazilian specimens, respectively ( Brusa et al. 2008; Marcus 1946). Although stylet dimensions are smaller than those previously described, the stylet configuration remains the same.
Distribution: The species was previously recorded from Brazil (São Paulo, Corôa lagoon) ( Marcus 1946) and Argentina (Buenos Aires province, littoral of the Río de la Plata: Atalaya and La Matilde stream) ( Brusa et al. 2008).
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