Leucothoe merletta Krapp-Schickel & Broyer 2014
- Dataset
- Revision of Leucothoe (Amphipoda, Crustacea) from the Southern Ocean: a cosmopolitanism concept is vanishing
- Rank
- SPECIES
- Published in
- Krapp-Schickel, Traudl, Broyer, Claude De (2014): Revision of Leucothoe (Amphipoda, Crustacea) from the Southern Ocean: a cosmopolitanism concept is vanishing. European Journal of Taxonomy 80: 1-55, DOI: 10.5852/ejt.2014.80
Classification
- kingdom
- Animalia
- phylum
- Arthropoda
- class
- Malacostraca
- order
- Amphipoda
- family
- Leucothoidae
- genus
- Leucothoe
- species
- Leucothoe merletta
description
Description Length 2.5 mm. Head Anterior margin rounded, anterodistal margin rectangular with rounded corner. Mid-cephalic keel not prominent. Rostrum small. Eyes round, yellow. Antennae short and robust, A 1 flagellum 5 - articulate, peduncle art. 1 subequal in length but twice the width of article 2, disto-inferiorly without acute tooth, art. 3 nearly 1 / 2 of art. 2, acc. flagellum not seen. Peduncle art. 3 + flagellum about as long as peduncle art. 2. A 2 subequal in length with antenna 1, peduncle art. 4> art. 5, flagellum 4 arts. Mouthparts: Mandibles lacking molars, incisor and lacinia mobilis dentate; palp 3 - articulate, art. 2 with 4 long lateral and one distal setae, art. 3 with 2 distal setae, subequal to art. 2. Peraeon Cx 1 smooth, length> width; anterior margin smooth, anterodistal corner somewhat lengthened, facial setae absent, inferior margin smooth. Gn 1 basis somewhat inflated, smooth; ischium smooth; carpus basis more than half as long as propodus, distal part linear, narrow, about 7 - 9 x longer than wide (width very different); propodus straight, about 5 x as long as wide, palm smooth; dactylus smooth, reaching more than 1 / 3 propodus length. Cx 2 about as wide as long, in the shape of a parallelogram, width similar to Cx 3, distally smooth; anterior margin scarcely excavate, anterodistal corner acutely lengthened, inferior and posterior margin straight, facial setae absent. Gn 2 basis not inflated, on anterior margin some setae; carpus nearly reaching half propodus length, curved, distally rounded, with small incision, setose; propodus anterodistally without prolongation, with some setae, posterior margin with many low humps, palm convex, proximally near dactylus-end with weak blunt corner; facial setae medially and submedially present, but not abundant; dactylus curved, both margins smooth, bare, reaching somewhat more than half of propodus length. Cx 3 length subequal to width, rounded, anterior and posterior margin straight, quadrangular, smooth, facial setae absent. Cx 4 length shorter then width, smooth, bare, anterior margin distally excavate, anterodistal corner acutely pointed and lengthened, posterior margin clearly shorter than anterior one, rounded, facial setae absent. P 3, 4 basis slender, width subequal to merus; dactylus reaching nearly half length of propodus, posterior margins smooth. Cx 5 - 7 facial setae absent. P 5 - 7 similar, bases l: w ratio about 1.5, margins smooth. Merus with posterodistal corner scarcely lengthened and not widened. Pleon Ep 1 - 3 bare. Ep 2 posterodistal corner somewhat upturned, rounded; Ep 3 posteroventral corner blunt, rectangular. Uropods: U 2 with unequal rami, the shorter one shorter than peduncle. U 3 unknown. Telson ratio l: w unknown.
description
urn: lsid: zoobank. org: act: 6 C 2 BCD 72 - 777 F- 4825 - B 595 - A 23 EBFE 445 C 9 Figs 5, 13 - 14
diagnosis
Diagnosis Eyes round, yellowish. Mandibular palp art. 3 nearly as long as art. 2. Cx 2 smooth, in shape of a parallelogram, anterodistal corner acutely lengthened. Cx 4 also with anteridistal corner acutely lengthened, but posterior margin much shorter than anterior one. Gn 1 propodus l: w = 4, dactylus reaching nearly 1 / 2 of propodus length. P 5 - 7 basis oval, with regularly rounded hind margin, ratio l: w about 1.5; posterior margin in P 7 smooth. Ep 2 distoposterior corner slightly upturned, Ep 3 posterodistally with rectangular corner. T l: w not known.
discussion
Remarks Until now we know only one representative of this new species, but the peculiar shape of Cx 2 and Cx 4 makes it easy to recognize it within the Antarctic and sub-Antarctic species. Within the hitherto known Leucothoe species L. lilljeborgi (Boeck, 1861) as well as L. ayrtonia Bellan-Santini, 1997 have a similar Cx 4 with a pointed anterodistal corner but rounded Cx 2, while L. angusticoxa (Ledoyer, 1972), described as “ Leucothopsis n. gen. ”, has Cx 2 pointed and Cx 4 rounded.
distribution
Distribution East Antarctic, off Queen Maud Land, Breidbay (70 ° S, 24 ° E). Depth range 200 m.
etymology
Etymology In Italian “ merletto ” is the bobbin lace; as the very acutely elongated Cx 2 and Cx 4 can remind on lacecollars, this epitheton (Latinized flexible adjective) was coined.
materials_examined
Type material Holotype ♀ 2.5 mm, Belgian-Dutch Antarctic Expeditions (RBINS, I. G. 23694 / INV. 103463); EABN 1966 - 67: sta. 238; 3 Feb. 1967; Breid Bay, Baie Léopold; 70 ° 19 ’ S, 24 ° 14 ’ E; 200 m; bottom trawl; coll. M. Steyaert & M. Meisch.