Anarthrurella clairae Bird, 2004, sp.nov.
Creators
Description
Anarthrurella clairae sp.nov. ( Figs. 13–14)
Anarthrura simplex: Holdich & Bird, 1986: 79, 98, table 2.
Material examined. Holotype: neuter, BT244, (NMSZ:2004.012). Paratypes: three neuters (BT244).
Description. Neuter/nonovigerous female. Tiny anarthrurid, body (Fig. 13A) slender, 8.9 times longer than broad, length 1.09–1.47 mm. Cephalothorax 1.24 times longer than broad, 14% of body length, rostrum small. Pereonite1 narrower caudally, pereonites 2–6 subrectangular with rounded corners, each with two dorsolateral setae, 0.55, 0.83, 0.88, 1.05, 1.08, and 0.92 times longer than broad respectively. Pleon 2.1 times longer than broad, 21% of body length, pleonites 1 and 5 longer than 2–4; pleonite5 with two dorsolateral setae. Pleotelson (Figs. 13B–C) conical, 0.73 times as long as broad, with two distal setae and two sensory setae near apex, apex slightly deflexed with two terminal setae.
Figure 13. Anarthrurella clairae. Nonovigerous female A, dorsal view; B–C, pleonite 5 and pleotelson lateral and dorsal view; D, antennule; E, antenna; F, labrum, ventral view; G, maxillule endite, distal; H, maxilliped; J, cheliped; K, anterior seta of cheliped propodus; L, variation in fixed finger dentition. Scale bar 0.5 mm (A) 0.21 mm (B–C), 0.14 mm (D–E,H–L), 0.1 mm (F–G).
Antennule (Fig. 13D) threequarters length of cephalothorax; article1 twice as long as broad, article2 just longer than broad; article4 as long as article2; setation as figured. Antenna (Fig. 13E) typical of family, 80% length of antennule; article6 with one short and one long thickened (fused?) seta.
Labrum (Fig. 13F) conical, relatively large. Maxillule endite (Fig. 13G) with at least three spiniform setae. Maxilliped (Fig. 13H) basis small in relation to palps, without setae; endites simple, rectangular; palp article3 with three strongly plumose setae article4 with five large plumose setae.
Cheliped (Fig. 13J) with numerous microtrichia; pseudocoxa long and ovoid; basis short and cylindrical, with lateral seta; merus with strong ventral seta; carpus 1.7 times longer than greatest width, with two dorsal and two ventral setae; propodus with large lateral fold, clearly visible in dorsal view, with anterior spiniform seta (Fig. 13K); fixed finger thick (almost cylindrical in crosssection), with one ventral seta, one seta at articulation with dactylus, and three near incisive margin; incisive margin (Fig. 13L) shallowconvex, with three or four hooklike teeth; dactylus typical of family, with strong anterior spiniform seta.
Pereopod1 (Fig. 14 A) basis curved, four times longer than broad; ischium with seta; merus about twice as long as broad, without setae (?); carpus subrectangular, 1.7 times longer than broad and just shorter than merus, with two distal setae; propodus 2.5 times longer than broad, with ventrodistal seta; dactylus and unguis together just shorter than propodus, dactylus with accessory seta. Pereopods 2–3 (Figs. 14 B–C) similar, but basis slightly shorter and merus only half as long as in pereopod1, with two ventral setae; carpus just longer than broad; propodus shorter than in pereopod1.
Pereopods 4–6 (Figs. 14 D–F) similar, basis tumid, 2.75 times longer than broad, pereopod6 at least with a sensory seta; ischium without seta; merus short, as long as broad, with two ventral spiniform setae; carpus just longer than merus, with three spiniform seta and a small dorsal seta; propodus as long as carpus, with terminal spine and three distal spiniform setae, one longer than the other two; dactylus and unguis together about as long as propodus.
Pleopods (not figured) small, with distal setae.
Uropod (Fig. 14 G) exopod short, as long as broad, with three distal setae; endopod 2 articled, twice as long as basal article, article1 about twothirds total length, with seta near articulation, article2 with four terminal setae.
Type locality. Sound of Kerrera (Firth of Lorn), Argyll, Scotland, 56o 22.2’N 5o 32.3’W, 30 m, shelly mud.
Etymology. For my wife Claire.
Remarks. The smallest of the anarthrurids in this paper (including known mancae), misidentified by me as preparatory males of A. simplex. Its small size and slender build could lead it to being overlooked or inefficiently collected with sieve meshsizes of = 0.5 mm. This is the second new species from the Oban area along with Subulella scotti Holdich & Bird, 1986.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Anarthruridae
- Genus
- Anarthrurella
- Kingdom
- Animalia
- Order
- Tanaidacea
- Phylum
- Arthropoda
- Species
- clairae
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Taxonomic concept label
- Anarthrurella clairae Bird, 2004
References
- Holdich, D. M. & Bird, G. J. (1986) Tanaidacea (Crustacea) from sublittoral waters off West Scotland, including the description of two new genera. Journal of Natural History, 20, 79 - 100.