Paracorophium nana Myers, 2009, sp. nov.
Creators: name: Myers, Alan A.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Corophiidae
Paracorophium
Paracorophium nana

description: <i>Paracorophium nana</i> sp. nov. (Figs 1, 2) <b>Type material.</b> Holotype, male, 1.8 mm, AM P70806, Ferriers Creek, Lizard Island (14 o 39’56”S 145 o 27’03”E), algae from rocks at edge of mangroves (<i>Rhizophora stylosa</i>), hand collected, 0.5 m, S.E. LeCroy, R. A. King, K.N. Klebba &amp; T. Krapp-Schickel, 23 February 2005 (QLD 1655). Paratype: female, 1.9 mm, same data as holotype, AM P70806 (QLD 1655). <b>Other material examined.</b> 1 male, AM P70805 (QLD 1655); 2 females, AM P70924 (QLD 1677); 1 male, 7 females SEL/LZI 6-2. <b>Type locality.</b> Ferriers Creek, Lizard Island, Queensland, Australia. <b>Etymology.</b> Named for its very small size. <i>Description.</i> Based on holotype, male 1.8 mm, AM P70806. <b>Head.</b> <i>Head</i> lateral cephalic lobes rounded; eye large, composed of many ommatidia. <i>Antenna 1</i> very short, less than one third body length; flagellum composed of 4–5 articles; accessory flagellum absent. <i>Antenna 2</i> short, subequal in length with antenna 1; article 4 lacking a posterodistal lobe; flagellum with 3 articles. <i>Mandible</i> palp articles 2 and 3 subequal; article 3 subovoid with long distal setae. <b>Pereon.</b> <i>Gnathopod 1</i> coxa enlarged, distally expanded; carpus longer than propodus, posterior margin densely setose; propodus subchelate. <i>Gnathopod 2</i> merus enlarged and distally free, with dense long setae forming a sieve together with setae on carpus; propodus slender, twice as long as broad, with posterodistal spine and palmar excavation; dactylus greatly overlapping palm. <i>Pereopods 5–7</i> basis posterior margin with dense pectinate setae. <b>Pleon.</b> <i>Urosomites</i> fused. <i>Uropod 1</i> peduncle with short distoventral spine; rami margins with robust setae and with terminal cluster of robust setae. <i>Uropod 2</i> inner ramus subequal in length with peduncle; outer ramus much shorter than inner ramus. <i>Uropod 3</i> biramous; peduncle without distal expansion; outer ramus minute. <b>Female</b> (sexually dimorphic characters). Based on paratype, female, 1.9 mm, AM P70806. <i>Gnathopod 2</i> propodus slender, lacking posterodistal spine. <b>Habitat.</b> Algae near mangroves. <b>Remarks.</b> This species is similar to <i>P. brisbanensis</i> Chapman, 2002, but differs in a number of ways. The male antenna 2 article 4 lacks a posterodistal lobe; the mandible palp is much shorter with article 3 sub-ovoid; the carpus of gnathopod 1 is much more slender; the propodus of gnathopod 2 is also slender with a short posterodistal spine and weakly developed palmar spine; uropods 1–2 have fewer, weaker robust setae; the uropod 1 distoventral spine is acute (rounded in <i>P. brisbanensis</i>); uropod 3 inner ramus has a marginal robust seta (absent in <i>P. brisbanensis</i>). In addition, this species is much smaller, at less the 2.0 mm (<i>P. brisbanensis</i> up to 4.4 mm). <b>Distribution.</b> <i>Australia</i>. Queensland: Lizard Island (current study).
description: Published as part of <i>Myers, Alan A., 2009, Corophiidae *, pp. 373-379 in Zootaxa 2260 (1)</i> on pages 373-376, DOI: 10.11646/zootaxa.2260.1.18, http://zenodo.org/record/5320114
description: {"references": ["Chapman, M. A. (2002) Australasian species of Paracorophium (Crustacea: Amphipoda): the separate identities of P. excavatum (Thomson, 1884) and P. brisbanensis sp. nov. Journal of the Royal Society of New Zealand, 32 (2), 203 - 228."]}