Trichoniscus microphthalmus, Taiti & Rossano, 2015
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publication ID |
https://doi.org/ 10.1080/00222933.2015.1009512 |
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publication LSID |
lsid:zoobank.org:pub:DCBF3103-1463-4A32-9BC0-A4CFE8B762AE |
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DOI |
https://doi.org/10.5281/zenodo.4337188 |
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persistent identifier |
https://treatment.plazi.org/id/5A1C336C-D47A-42B5-9310-8709DAAFD50D |
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taxon LSID |
lsid:zoobank.org:act:5A1C336C-D47A-42B5-9310-8709DAAFD50D |
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treatment provided by |
Carolina |
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scientific name |
Trichoniscus microphthalmus |
| status |
sp. nov. |
Trichoniscus microphthalmus View in CoL sp. nov.
( Figures 1 View Figure 1 and 2 View Figure 2 )
Material examined
Holotype: ♂, St. 8, leg. S. Taiti and C. Rossano, 28 September 2005 ( MZUF 9453 View Materials ) . Paratypes: 25 ♂♂, 75 ♀♀, same data as holotype ( MZUF 9453 View Materials ) ; 3 ♂♂, 5 ♀♀ same locality and collectors, 28 April 2004 ( MZUF 9454 View Materials ) .
Description
Maximum length: ♂, 2.0 mm; ♀, 2.5 mm. Body colourless, ovoidal, with pleon narrower than pereon ( Figure 1A View Figure 1 ). Back almost smooth covered with numerous cordiform scale-setae ( Figure 1B View Figure 1 ). Cephalon ( Figure 1C View Figure 1 ) with suprantennal line bent downwards; antennal lobes rounded, distinctly visible in dorsal view; eye reduced, visible as one to three small dots of dark pigment. Distal part of telson with concave sides and truncate apex ( Figure 1D View Figure 1 ). Antennule ( Figure 1E View Figure 1 ) of three articles; distal article longer than second, bearing three aesthetascs on apical margin. Antenna ( Figure 1F View Figure 1 ) fifth article as long as flagellum; flagellum of three articles with one row of five aesthetascs on second article. Mandibles with one penicil in the right ( Figure 1G View Figure 1 ) and two penicils in the left ( Figure 1H View Figure 1 ). Outer branch of maxillule with 5 + 5 teeth, apically entire, and three slender stalks; inner branch with three penicils ( Figure 2A View Figure 2 ). Maxilla with setose and bilobate apex, inner lobe smaller ( Figure 2B View Figure 2 ). Maxilliped endite narrow, with a large apical penicil ( Figure 2C View Figure 2 ). Pereopods with an ungual seta and a large, bifid and setose dactylar seta ( Figure 2D, 2E View Figure 2 ). Uropod ( Figure 1D View Figure 1 ) with protopod not grooved on outer margin; endopod slightly shorter than exopod, inserted at the same level.
Male: Pereopods 1–4 ( Figure 2D View Figure 2 ) with carpus and merus bearing numerous short scales on sternal margin. Pereopod 7 ( Figure 2E View Figure 2 ) ischium with straight sternal margin. Pleopod 1 ( Figure 2F View Figure 2 ) exopod with straight medial margin and sinuous outer margin; endopod of two articles, distal article tapering to a point, apical part shagreened. Pleopod 2 ( Figure 2G View Figure 2 ) exopod subrectangular with distal margin slightly convex; endopod of two articles, distal article styliform, about three times as long as basal one.
Etymology
From the Greek ‘mikrós’ = small + ‘ophthalmós’ = eye. The name refers to the reduced eye visible as one to three small dots of dark pigment.
Remarks
The genus Trichoniscus was previously known in Morocco only for the widespread species T. pygmaeus Sars, 1899 (Vandel 1959) . A second species, Trichoniscus solisensis Vandel, 1959 , from a cave near Safi, western Morocco, has been proved to belong to the genus Adoniscus Vandel, 1955c (Olibrinidae) ( Taiti and Ferrara 2004). In Algeria four species of Trichoniscus are known: T. gachassini ( Giard, 1899) , T. fragilis Racovitza, 1908 , T. provisorius Racovitza, 1908 , and T. peyerimhoffi Vandel, 1955a ( Schmalfuss 2003) . Another species of Trichoniscus ( T. gordoni Vandel, 1955a ) is known from several caves in southern Spain and Gibraltar ( Vandel 1955a). The new species T. microphthalmus is readily distinguishable from all these species by the male pereopods 1–4 with sternal margin of carpus and merus bearing a fringe of scales, and by the shape of the male pleopod 1 exopod.
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