Miktoniscus longispina Reboleira & Taiti, 2015
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publication ID |
https://doi.org/ 10.5852/ejt.2015.161 |
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publication LSID |
lsid:zoobank.org:pub:2297E4A3-D279-4D0A-923C-D5E0D5DCB3C0 |
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DOI |
https://doi.org/10.5281/zenodo.3815789 |
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persistent identifier |
https://treatment.plazi.org/id/6B9A5E8B-53F8-408D-B3BA-8E10BCE20717 |
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taxon LSID |
lsid:zoobank.org:act:6B9A5E8B-53F8-408D-B3BA-8E10BCE20717 |
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treatment provided by |
Carolina |
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scientific name |
Miktoniscus longispina Reboleira & Taiti |
| status |
sp. nov. |
Miktoniscus longispina Reboleira & Taiti View in CoL sp. nov.
urn:lsid:zoobank.org:act:6B9A5E8B-53F8-408D-B3BA-8E10BCE20717
Figs 18 View Fig A–F, 19A–E, 20A–D
Diagnosis
A species of Miktoniscus characterised by a depigmented body, the male pereopod 7 having a long and stout seta on the distal corner of the ischium, and a triangular male pleopod 1 exopod.
Etymology
From Latin longus = long + spina = spine. The name of the new species refers to the long, thick seta on the distal part of the male pereopod 7.
Material examined
Holotype
PORTUGAL: ♂, Gruta dos Bolhos, Cesaredas Plateau, 26 Dec. 2010 ( MZUF).
Paratype
PORTUGAL: 1 ♀, same locality as holotype, Feb. 2009 ( MZUF).
Additional material
PORTUGAL: 1 ♂, 2 ♀♀, Gruta da Cerâmica, Sicó Massif, 10 Jun. 2011 ( MZUF); 2 ♂♂, 3 ♀♀, same locality, 2 Mar. 2013 ( SR); 1 ♂, 1 ♀, Algar da Ervilha, Sicó, 30 Mar. 2014 ( ZMUC).
Description
Maximum size: ♂ and ♀ 3.5 ×1.0 mm. Body depigmented, elongated ( Fig. 18A View Fig ). Dorsum of cephalon and pereon distinctly granulated, each granule bearing a scale-seta on top ( Fig. 18B View Fig ). Cephalon ( Fig. 18C View Fig ) with no frontal lobes. Eye consisting of single black ocellus (lacking in specimens from Gruta da Cerâmica and Algar da Ervilha). Pereonites 1–4 with rounded posterior corners; pereonites 5–7 with epimera pointing backwards ( Fig. 18A View Fig ). Pleon ( Fig. 18A, D View Fig ) slightly narrower than pereon; pleonites 3–5 with reduced epimera and very short posterior points. Telson ( Fig. 18D View Fig ) about twice as wide as long, with rectangular basal part and trapezoidal distal part, with almost straight sides. Antennula ( Fig. 18E View Fig ) with three articles; third article with short spine and four long aesthetascs at apex (five in specimens from Gruta da Cerâmica and Algar da Ervilha). Antenna ( Fig. 18F View Fig ) with fifth article of peduncle slightly longer than flagellum; flagellum with four articles, with one aesthetasc on second article and two aesthetascs on third article (two and four, respectively, in specimens from Gruta da Cerâmica and Algar da Ervilha). Mandibles ( Fig. 19 View Fig A–B) with one penicil on the right and two on the left; molar process without penicils. Maxillula ( Fig. 19C View Fig ) with inner branch bearing three penicils at apex, diminishing in size from proximal to distal; outer branch with nine teeth and thin stem. Maxilla ( Fig. 19D View Fig ) apically bilobed, outer lobe smaller and shorter than inner one; inner lobe with line of several long, stout setae near apical and inner margins. Maxilliped ( Fig. 19E View Fig ) endite triangular, with stout triangular penicil at apex; palp elongated, with long setae on margin of apical part, and basal article with two short, simple setae. Uropod ( Fig. 18E View Fig ) with exopod distinctly longer than endopod and more distally inserted.
MALE. Pereopod 1 ( Fig. 20A View Fig ) with no distinct sexual modifications. Pereopod 7 ( Fig. 20B View Fig ) ischium triangular, with strong seta, as long as merus, at corner between distal and sternal margin; sternal margin of merus sinuous, with one recurved seta and one pointed seta in the middle; carpus with distal part enlarged, with some strong setae on sternal margin. Pleopod 1 ( Fig. 20C View Fig ) exopod triangular, about twice as long as wide; endopod with basal article distinctly shorter than distal article, which is slightly enlarged subapicaly, with triangular and crenulated apical part. Pleopod 2 ( Fig. 20D View Fig ) exopod triangular, with distinctly concave outer margin; endopod biarticulated, distal article fusiform, elongated, about four times as long as first article.
Remarks
At present, the genus Miktoniscus includes 15 species distributed in the Americas and Western Europe, including the Atlantic islands ( Schmalfuss 2003). The new species is readily distinguishable from all species in the genus by the presence of a strong and long seta at the distal corner of the male pereopod 7 ischium. In continental Portugal and northwestern Spain only one species was previously known, Miktoniscis bisetosus Vandel, 1946 , from which M. longispina Reboleira & Taiti sp. nov. also differs in lacking a recurved seta on the male pereopod 7 carpus and in having the male pleopod 1 exopod with an acute, rather than broadly rounded, apex. The new species occurs in two distinct massifs of central Portugal, on the west border of Cesaredas Plateau near the Atlantic coast, and in Gruta da Cerâmica and Algar da Ervilha in the centre of Sicó Massif. Some differences are present in the specimens from Sicó compared with the type specimens from Cesaredas, i.e., the lack of visible eyes and the different number of aesthetascs on the antennula and antennal flagellum. For this reason, we have not designated the additional material as paratypes. However, since the male characters are the same in all these populations, we consider them as belonging to the same species.
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