Leydigiopsis ornata Daday, 1905
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publication ID |
https://doi.org/10.1590/2358-2936e2017029 |
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persistent identifier |
https://treatment.plazi.org/id/663D781D-8D44-FFE6-C3BB-FEBBFE075E6A |
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treatment provided by |
Felipe |
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scientific name |
Leydigiopsis ornata Daday, 1905 |
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Leydigiopsis ornata Daday, 1905 View in CoL
( Figs. 3F–G View Figure 3 , 4A–I View Figure 4 )
Material examined: Two adult parthenogenetic females and one adult male ( FDRS489 ) .
Description of adult male: Habitus ( Fig. 4A View Figure 4 ). Smaller and more elongated than female, length 0.60 mm, about 1.4 times as long as high; greater height close to half length of body; laterally compressed, without dorsal keel; marginal line not straight, with a depression behind middle of body.
Head ( Fig. 4A View Figure 4 ). Rostrum markedly shorter than in female, about 1.2 times longer than length of antennular body;ocellusandeyeofsubequalsize. Headshield ( Fig.4B View Figure 4 ) about two times as long as wide; posterior region triangular-shaped, apex rounded; single slot-shaped main head pore about 3 times longer than wide, tiny lateral head pores inserted at middle level of length of main pore; PP about same length of the main head pore. Labral keel ( Fig. 4D View Figure 4 ) triangular, margin slightly convex and armed with three rows of short setulae, apex not acute.
Carapace ( Fig. 4A View Figure 4 ) relatively elongated, ornamentation as fine striae, ventral margin armed with 76 setae slightly plumose, strongly differentiated in groups; posteroventral corner of carapace, rounded, without denticles.
Antennules ( Fig. 4G View Figure 4 ). Antennular body not exceeding the tip of rostrum, about two times as long as wide; one pair of aesthetascs laterally inserted, eight apical aesthetascs of which seven of them longer than antennular body itself. Sensory seta about same length as antennular body. Male seta short and robust, about 3.6 times shorter than antennular body length, apex sharp.
Thorax and abdomen ( Fig. 4A View Figure 4 ). Thorax longer than abdomen. Abdomen armed with four rows of setulae.
Postabdomen ( Fig. 4E, F View Figure 4 ). Straighter and more elongated than in females, about 2.5 times longer than wide; dorsal and ventral margins slightly convex. Anal margin as in females. Postanal margin slightly convex, armed with 16 long and slender marginal denticles unmerged, decreasing in length towards anal margin; twenty lateral fascicles, distalmost bears smaller number of setulae (3–4), setulae of the distalmost fascicles thicker than others; distal portion rounded. Gonopores inserted laterally near to ventral margin, at same level as postabdominal claw. Postabdominal claw ( Fig. 4E, F View Figure 4 ). Shorter than in female, with length about two times longer than anal margin; length of proximal pecten spinulae not exceeding the level of basal spines; a group of four short basal spines, inserted at some distance from the base of postabdominal claw.
Limb I ( Fig. 4I View Figure 4 ). Ventral face with 13 long setulae; copulatory brush armed with many setulae, the distalmost being longer. Copulatory hook U-shaped, arms of different length. ODL bears a projection (accessory seta?) at base and a row of long and thick setulae; ODL seta slender, bi-segmented, about two times longer the IDL setae. IDL with three setae, first one markedly shorter than setae 2–3, which have similar length; setae 2-3 armed with setulae; male setae long, subequal in length to IDL setae, apex curved.
Remarks: For full redescription and differential diagnosis based on parthenogenetic females see Van Damme and Sinev (2013), which also provides good illustrations and an identification key to Leydigiopsis Sars, 1901 species. The male of L. ornata is quite similar to males already described for the genus ( Sinev, 2004). The presence of three rows of setulae on labral keel is unique to L. ornata male. As in females, the male of L. ornata is mainly differentiated from Leydigiopsis megalops Sars, 1901 and Leydigiopsis curvirostris Sars, 1901 by the morphology of the postabdomen.
Distribution: Neotropics (Van Damme and Sinev, 2013). In Brazil, the species occurs in the Amazônica, Paraná, Paraguai, São Francisco, Atlântico Nordeste Oriental, Sudeste, and Sul hydrographic regions ( Elmoor-Loureiro, 2017).
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