Leucothoe nagatekubi
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Ordo: Amphipoda
Familia: Leucothoidae
Genus: Leucothoe
Name
Leucothoe nagatekubi White & Reimer, 2012 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype male, 3.0 mm RUMF-ZC-1768, Mizugama, Okinawa–jima Island, Okinawa, reef wall (26°21'35"N, 127°44'22"E), in canals of orange encrusting sponge, Clathria of Schmidt 1862[1], 10 m, N.S. White, col., 26 February 2011 (KNWOkinawa34K). Paratype female, 3.4 mm RUMF-ZC-1769, Mizugama, Okinawa reef wall (26°21'35"N, 127°44'22"E), in canals of orange encrusting sponge, Clathria, 7 m, N.S. White, col., 20 October 2011 (KNWOkinawa69D)
Type locality
Mizugama, Okinawa–jima Island, Okinawa, Japan (26°21'35"N, 127°44'22"E).
Additional material examined
9 specimens, NSMT-Cr 21896, KNWOkinawa69B; 9 specimens, RUMF-ZC-1770, KNWOkinawa69C.
Diagnosis (male)
Head anterior margin truncate, anterodistal margin quadrate with cusp. Maxilla 1 palp 1–articulate. Maxilliped outer plate tuberculate with facial setae. Gnathopod 1 basis anterodistal margin with 7 very short, slender setae. Gnathopod 2 carpus elongate, distally tapered; propodus palm with large concavity. Pereopod 7 basis posteriorly serrate. Telson with plumose facial setae.
Description (male)
Head. Anterior margin truncate, anterodistal margin quadrate with cusp; ventral cephalic keel anterior margin transverse, anteroventral margin quadrate, ventral margin distally excavate, rounded; eyes with more than 10 ommatidia, round. Antenna 1 0.3 × body length, flagellum 7–articulate, peduncle article 1 width less than 2 × article 2, accessory flagellum 1–articulate. Antenna 2 0.3 × body length, subequal in length with antenna 1, flagellum 4–articulate. Mandibular palp ratio of articles 1–3 1.0: 3.0: 1.7, article 2 with 2 medium distal setae, article 3 with 2 distal setae, incisors strongly dentate; left mandible with 5 raker spines, lacinia mobilis large, strongly toothed; right mandible with 7 raker spines, lacinia mobilis small, strongly dentate. Upper lip asymmetrically lobate, anterior margin setose. Lower lip inner lobes fused, bare; outer lobes with moderate gape, anterior margins setose. Maxilla 1 palp 1–articulate with 4 distal setae; outer plate with 5 distal robust setae. Maxilla 2 inner plate with 3 robust distal setae and 7 slender marginal setae; outer plate with 3 robust distal setae and 15 slender distal marginal setae. Maxilliped inner plates distal margin with a v-shaped indentation, with short robust setae; outer plate inner margin tuberculate, reaching 0.1 × palp article 1, with simple marginal setae, facial setae present; palp article 4 subequal in length with article 3, distally acute.
Pereon. Coxae 1–4 relative widths 1.0: 1.8: 1.1: 2.1. Gnathopod 1 coxa smooth, with tiny marginal setae, anterodistal margin produced, rounded with cusp, distal margin straight, posterior margin excavate, facial setae absent; basis linear, anterodistal margin with 7 very short, slender setae, posterior margin bare; ischium bare; carpus linear, distal length 13.1 × width, proximal margin serrate, distal margin with 1 short seta; propodus straight, palm with 6 distal triangular teeth and 6 distal setae; dactylus smooth, reaching 0.1 × propodus length. Gnathopod 2 coxa broader than long, subequal in size with coxa 3, smooth, with tiny marginal setae, anterior margin expanded anteriorly, anterodistally rounded, distal margin oblique, posterior margin straight, facial setae absent; basis distally expanded, anterior margin with 5 medium setae, distal margin with 2 setae, posterior margin with 3 setae; ischium with 3 posterior, 2 distal, and 3 posterodistal setae; carpus 0.5 × propodus length, curved, distally tapered, anterior margin smooth; propodus with 1 mediofacial setal row above midline, reaching 0.8 × propodus length, with 2 submarginal setae, posterior margin smooth, palm convex with 6 major tubercles and 1 major concavity; dactylus curved, proximal margin smooth with 1 seta, anterior margin distally acute, reaching 0.5 × propodus length. Pereopod 3 coxa length 1.5 × width, anterodistal corner overriding distal face of coxa 2 and extending below it, smooth, with tiny marginal setae, anterior margin evenly rounded, distal margin oblique, posterior margin straight, facial setae absent. Pereopod 4 coxa smooth, with tiny marginal setae, anterior margin produced, distal margin evenly rounded, posterior margin tapered, facial setae absent. Pereopods 5–7 coxae facial setae absent; bases width length ratios 1: 1.3, 1: 1.3, 1: 1.2, posterior margins setose. Pereopods 5–6 bases posterior margins smooth, pereopod 7 basis posterior margin serrate.
Pleon. Epimera 1 and 3 bare, epimeron 2 with ventral setae; epimeron 3 posteroventral corner rounded. Uropods 1–3 relative lengths 1.0: 0.7: 0.9. Uropod 1 peduncle and outer ramus subequal in length with inner ramus; inner ramus with 5 robust setae and outer ramus with 2 robust setae. Uropod 2 peduncle 0.9 × inner ramus length, outer ramus 0.7 × inner ramus length; inner ramus with 1 robust seta and outer ramus with 2 robust setae. Uropod 3 peduncle 1.6 × inner ramus length, outer ramus 0.9 × inner ramus length; inner ramus with 1 robust seta and outer ramus with 2 robust setae. Telson 2.3 × longer than wide, with plumose facial setae, apex strongly tridentate.
Female (sexually dimorphic characters).
Unknown.
Etymology
After the Japanese words ‘nagai’, meaning ‘long’, and ‘tekubi’, meaning ‘wrist’ and referring to the elongate carpus on gnathopod 2. (Pronounced na-ga-tay-koo-bee)
Ecology
In canals of orange encrusting sponge, Clathria sp., RUMF-ZP-5, KNWOkianawa69G (Figure 25D), found in caves.
Relationships
Leucothoe nagatekubi sp. n. is similar to Leucothoe serrata White & Thomas, 2009 in having an elongate gnathopod 2 carpus, narrow gnathopod 1 propodus and carpus, high mediofacial setal row on gnathopod 2 propodus, and wide pereopod 5–7 bases. It differs in the large indentation on the gnathopod 2 propodus palm, having a 1–articulate accessory flagellum on antenna 1, triangular teeth on gnathopod 1 propodus palm, and a 1–articulate maxilla 1 palp.
Remarks
Leucothoe nagatekubi sp. n. is pinkish-orange in color (Figure 24C). This species is endemic to the western coast of Okinawa–jima Island, Okinawa.
Distribution
East China Sea: Okinawa–jima Island, Okinawa, Japan.
Original Description
- White, K; Reimer, J; 2012: Commensal Leucothoidae (Crustacea, Amphipoda) of the Ryukyu Archipelago, Japan. Part II: sponge-dwellers ZooKeys, 166: 1-58. doi
Images
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![Figure 24. Color plate of new leucothoid amphipod species and sponge hosts. A Leucothoe hashi sp. n. B Leucothoe bise sp. n. C Leucothoe nagatekubi sp. n. D Axinellidae of Carter, 1875, RUMF-ZP-12 E ?Axinyssa of Lendenfeld 1897[2] F Callyspongia of Duchassaing and Michelotti 1864[3], RUMF-ZP-2 G Haliclona of Grant, 1836, RUMF-ZP-3 H Rhabdastrella of Thiele 1903[4], RUMF-ZP-1 I Tetillidae of Sollas 1886[5], RUMF-ZP-11 J Axinellidae of Carter, 1875.](/wiki/File:ZooKeys-166-001-g024.jpg)
![Figure 25. Color plate of sponge hosts. A Iotrochotidae of Dendy, 1922 (probably Iotrochota of Ridley 1884[6]), RUMF-ZP-7 B Mycale of Gray, 1867, RUMF-ZP-8 C ?Jaspis of Gray, 1867 D orange encrusting sponge, Clathria of Schmidt, 1862, RUMF-ZP-5 E ?Clathria (Thalysias) reinwardti Vosmaer, 1880, RUMF-ZP-4 F Tedania of Gray, 1867 G Mycale (Zygomycale) parishii (Bowerbank, 1875), RUMF-ZP-9 H ?Mycale of Gray, 1867, RUMF-ZP-10 I Niphatidae of Van Soest, 1980 (probably Niphates of Duchassaing and Michelotti 1864[3]), RUMF-ZP-6 J grey/purple hard sponge, Clathria (Thalysias) of Duchassaing and Michelotti 1864[3] K orange flame sponge, Ciocalypta of Bowerbank 1862[7] L orange stubby sponge, Mycale sp. M purple brown soft sponge, ?Pericharax of Poléjaeff 1883[8].](/wiki/File:ZooKeys-166-001-g025.jpg)
Other References
- ↑ Schmidt O (1862) Die Spongien des adriatischen Meeres. Wilhelm Engelmann, Leipzig, 1–88.
- ↑ Lendenfeld R (1897) Spongien von Sansibar. Abhandlungen herausgegeben von der Senckenbergischen naturforschenden Gesellschaft 21: 93-133.
- ↑ 3.0 3.1 3.2 Duchassaing De Fondbressin P, Michelotti G (1864) Spongiaires de la mer Caraibe. Natuurkundige verhandelingen van de Hollandsche maatschappij der wetenschappen te Haarlem 21 (2): 1-124.
- ↑ Thiele J (1903) Kieselschwämme von Ternate. II. Abhandlungen herausgegeben von der Senckenbergischen naturforschenden Gesellschaft 25: 933-968.
- ↑ Sollas W (1886) Preliminary account of the Tetractinellid sponges Dredged by H.M.S. ‘Challenger’ 1872–76. Part I. The Choristida. Scientific Proceedings of the Royal Dublin Society (new series) 5: 177-199.
- ↑ Ridley S (1884) Spongiida. In: Report on the Zoological Collections made in the Indo–Pacific Ocean during the Voyage of H.M.S. ‘Alert’, 1881–2. British Museum of Natural History, London, 366–482, 582–630.
- ↑ Bowerbank J (1862) On the anatomy and physiology of the Spongiadae. Part III On the generic characters, the specific characters, and on the method of examination. Philosophical Transactions of the Royal Society 152 (2): 1087-1135.
- ↑ Poléjaeff N (1883) Report on the Calcarea dredged by H.M.S. ‘Challenger’, during the years 1873–1876. Report on the Scientific Results of the Voyage of H.M.S. ‘Challenger’, 1873–1876. Zoology 8 (2): 1-76.
