Bellorchestia mariae Lowry 2012, sp. nov.
Creators
Description
Bellorchestia mariae sp. nov.
(Figs 1–3)
Type material. Holotype, male, 14.6 mm, AM P.87935, Honeymoon Bay, Jervis Bay, New south Wales, Australia (35°3'48"S 150°45'24"E), supralittoral zone burrowing in sand, 30 January 2011, Maria Capa. Paratypes: female, AM P.87934, juvenile male, AM P.87933, 18 males, 13 females, AM P.85301.
Additional material examined. 14 specimens, AM P.85880, Narrawallee Beach, New South Wales (35°18’27.7”S 150°28’21.2”E), 1305, oceanic beach under Cystophora in upper supralittoral zone, 30 April 2011, J.K. Lowry & A. Lodge, preserved in 95% ETOH (MI NSW 3690).
Type locality. Honeymoon Bay, Jervis Bay, New South Wales, Australia (35°3'48"S, 150°45'24"E).
Habitat. Under seaweed on sandy beach.
Etymology. Named for the collector, Maria Capa.
Description. Based on holotype male, 14.6 mm, AM P.87935.
Head. Eye medium (1/5–1/3 head length). Antenna 1 short, rarely longer than article 4 of antenna 2 peduncle. Antenna 2 up to half body length; peduncular articles slender; article 5 longer than article 4 (article 4 short). Mandible left lacinia mobilis 5-dentate. Maxilliped palp article 2 distomedial lobe well developed, 4 reduced, button-shaped.
Pereon. Gnathopod 1 sexually dimorphic; parachelate; coxa smaller than coxa 2, subtriangular, deeper than broad; posterior margin of propodus with lobe covered in palmate setae; propodus subrectangular, anterior margin with 6 groups of robust setae, medial surface with 10+ cuspidate setae; palm transverse, with 5 serrate setae; dactylus longer than palm. Gnathopod 2 sexually dimorphic; subchelate; coxa similar in size to coxa 3, about as broad as deep; basis slender; ischium and merus with distally rounded posterodistal lobe on medial surface; merus with distally rounded posterodistal lobe on medial surface; posterior margin of merus, carpus and propodus each without with lobe covered in palmate setae; carpus triangular, reduced (enclosed by merus and propodus), posterior lobe absent, not projecting between merus and propodus; propodus subovate, 1.6 × as long as wide; palm acute, reaching about 45% along posterior margin, weakly toothed, incised or sinuous, with 2 groups of robust setae, without protuberance near dactylar hinge, with small midpalmar protuberance with 9 or 10 robust setae, posterodistal corner defined by 2 slightly disjunct parallel ledges; posteromedial surface without groove; without cuticular patch at corner of palm; dactylus subequal in length to palm; gill lobate, 2 lobes, not incised. Pereopods 2–4 coxae slightly deeper than wide. Pereopods 3–5 gills simple or convoluted; smaller than gills 2 and 6. Pereopods 3–7 weakly cuspidactylate. Pereopods 3–7 dactyli without distal patch of many rows of tiny setae on the anterior margin. Pereopod 4 significantly shorter than pereopod 3; carpus significantly shorter than carpus of pereopod 3; thickened proximally with a notch midway along posterior margin; dactylus without anterodistal setal patch. Pereopod 5 propodus distinctly longer than carpus. Pereopod 6 subequal in length to pereopod 7; coxa posterior lobe inner view posteroventral corner rounded, posterior margin oblique to ventral margin, posterior lobe without ridge, posterior lobe with 5 or more marginal setae; coxal gill convoluted, coxal gill not incised; carpus slightly expanded. Pereopod 7 basis lateral sulcus present, slightly pronounced, posterodistal lobe present, rounded, produced downwards midway along ischium; merus and carpus slightly expanded; merus posterior margin straight; carpus forming a subtriangular plate.
Pleon. Pleopods all well developed. Pleopod 1 peduncle with marginal robust setae. Pleopods 1–3 biramous. Epimeron 2 slightly longer than epimeron 3. Epimeron 3 posterior margin smooth, with tiny setae, posteroventral corner subquadrate, ventral margin without robust setae. Uropod 1 not sexually dimorphic, peduncle with 17 or 18 robust setae, peduncle distolateral robust seta absent; inner ramus subequal in length to outer ramus, with 18 or 19 marginal robust setae; outer ramus with 10 marginal robust setae. Uropod 2 not sexually dimorphic; peduncle with 5 robust setae; inner ramus subequal in length to outer ramus, with 14 marginal robust setae; outer ramus with 6 marginal robust setae. Uropod 3 peduncle with 7 robust setae; ramus subequal in length to peduncle, ramus spatulalike, ramus with 11 marginal robust setae and 4 or 5 apical setae. Telson broader than long, apically incised, dorsal midline entire, with marginal and apical robust setae, with 18 robust setae per lobe.
Male juvenile, paratype, AM P.87933. Gnathopod 1 propodus palm slightly obtuse; dactylus as long as palm. Gnathopod 2 merus without posterodistal lobe on medial surface; propodus with posterodistal palmate lobe; palm transverse, straight.
Female (sexually dimorphic characters). Based on paratype female, AM P.87934. Gnathopod 1 parachelate, posterior margin of merus, carpus and propodus each without lobe covered in palmate setae; posterolateral surface with more than 10 serrate setae. Gnathopod 2 mitten-shaped; basis slightly expanded; ischium and merus without posterodistal lobe on medial surface; posterior margin of propodus with lobe covered in palmate setae; carpus well developed (not enclosed by merus and propodus), posterior lobe present, projecting between merus and propodus; 2.8 × as long as wide; palm obtuse, smooth, lined with serrate setae.
Remarks. The most distinctive difference between B. mariae and B. richardsoni is the shape of the male gnathopod 2 palm. In B. richardsoni the palm forms a broad concave distal margin with a narrow tooth just past the midpoint and a broad proximal margin with a small tooth and a discrete corner. In B. mariae the distal margin is much narrower, the midpalmar tooth is broader and widely rounded with 9 or 10 small robust setae, the broad proximal margin has a shallow ledge with about 11 robust setae. Also gnathopod 1 is parachelate in B. mariae and subchelate in B. richardsoni.
Distribution. New South Wales: Jervis Bay; Narrawallee Beach (current study).
Notes
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Linked records
Additional details
Identifiers
Related works
- Is part of
- Journal article: http://publication.plazi.org/id/0862C95ACF4BCD11061EFFB5B32EB044 (URL)
- Journal article: http://zoobank.org/8E0532A2-2BA1-41E1-8BAD-5ED0640C6691 (URL)
- Is source of
- https://sibils.text-analytics.ch/search/collections/plazi/F45BB122CF49CD140689FF22B76BB1C3 (URL)
Biodiversity
- Collection code
- AM , AM, ETOH
- Event date
- 2011-01-30 , 2011-04-30
- Family
- Talitridae
- Genus
- Bellorchestia
- Kingdom
- Animalia
- Order
- Amphipoda
- Phylum
- Arthropoda
- Scientific name authorship
- Lowry
- Species
- mariae
- Taxonomic status
- sp. nov.
- Taxon rank
- species
- Type status
- holotype , paratype
- Verbatim event date
- 2011-01-30 , 2011-04-30
- Taxonomic concept label
- Bellorchestia mariae Lowry, 2012