Cymadusa mariabyrneae Hughes &amp; Lowry 2009, sp. nov.
Creators: name: Hughes, L. E.
name: Lowry, J. K.
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Cymadusa
Cymadusa mariabyrneae

description: <i>Cymadusa mariabyrneae</i> Hughes &amp; Lowry sp. nov. (Figs 23, 24) <b>Type material.</b> Holotype, male, 6.4 mm, 3 slides, AM P76767 outer reef slope, south of One Tree Island (23°30.79’S 152°5.181’E), large sticks of coral rubble, 13.8 m, I. Takeuchi &amp; L.E. Hughes, 28 October 2006 (QLD 1994). Paratypes: female, 7.0 mm, 3 slides, AM P76768 (QLD 1994); 5 unsexed, AM P76769 (QLD 1994). <b>Additional material examined.</b> One Tree Island: 2 unsexed, AM P76771 (QLD 1959); 1 unsexed, AM P76770 (QLD 1960). <b>Etymology.</b> Named for Professor Maria Byrne, director of the One Tree Island Research Station. <b>Type locality.</b> Outer reef slope, south of One Tree Island, Great Barrier Reef, Queensland, Australia (23°30.79’S 152°5.181’E), living on large sticks of coral rubble, 13.8 m. <b>Description.</b> Based on holotype, male, 6.4 mm, AM P76767. <b>Head.</b> <i>Head</i> as long as deep. <i>Antenna 1 and 2</i> missing. <i>Upper lip</i> lateral margins each with midlateral notch. <i>Mandible</i> molar well developed, triturating, accessory setal row with 6 serrate setae; palp 3–articulate, apically setose and marginally setose; article 1 shorter than article 2; article 2 slightly longer than article 3; article 3 longer than article 1. <i>Lower lip</i> outer plates notched, forming a medial excavation, medial and lateral lobes subequal in size; mandibular lobe with curved margins, rounded apically. <i>Maxilla 1</i> inner plate with 1 seta; palp article 2 broad. <i>Maxilliped</i> outer plate with row of large robust setae along medial margin. <b>Pereon.</b> <i>Coxae 1–4</i> deeper than broad. <i>Gnathopod 1</i> subequal in size to gnathopod 2; coxa distinctly larger than coxa 2, produced, anterior margin concave, anteroventral corner rounded, with a tuft of slender setae in the posteroventral corner; basis anterodistal lobe absent, with 2 slender setae; merus posterodistal lobe subacute; carpus about 2 x as long as broad, subequal in length to propodus, anterior margin with slender setae, posterior margin straight; propodus broad, subtriangular; palm acute, straight, with rounded posterodistal corner, with 1 robust seta defining palm; dactylus subequal in length to palm, tapering evenly, apically acute, inner margin crenate. <i>Gnathopod 2</i> coxa with a tuft of slender setae in the posteroventral corner; basis without setae, anterodistal corner lobe absent, with 1 slender seta; merus margin with short, subacute anterodistal lobe; carpus shorter than propodus, subtriangular; propodus broad, less than 1.5 x as long as broad, subrectangular, anterior margin with fringe of slender setae; palm acute, excavate, with posterodistal corner subquadrate, without palm defining robust setae; dactylus overreaching palm, tapering evenly, apically acute, inner margin crenate. <i>Pereopods 3–4</i> basis narrow; merus subequal in length to carpus. <i>Pereopods 5–7</i> simple. <i>Pereopod 5</i> without medial slender setae; distal articles slender; propodus not expanded distally, with 1 anterodistal striated robust seta; dactylus slightly curved. <i>Pereopod 6</i> basis posterior margin straight, with several marginal slender setae; merus distal articles slender; propodus slightly expanded distally, with 1 anterodistal striated robust seta; dactylus slightly curved. <i>Pereopod 7</i> similar to pereopod 6. <b>Pleon.</b> <i>Epimera 2–3</i> posteroventral corner broadly rounded. <i>Uropod 1</i> peduncle with 9 robust setae, without fringe of slender setae, with large, acute distoventral spine; outer ramus length about 8 x as long as broad, with 8 lateral robust setae; inner ramus with 5 lateral robust setae. <i>Uropod 2</i> peduncle with 4 robust setae; outer ramus with 8 lateral robust setae; inner ramus with 7 lateral robust setae. <i>Uropod 3</i> peduncle longer than broad, less than 2 x length of rami, without marginal slender setae, with 7 distal and 1 mid-dorsal peduncular robust setae, without distal slender setae; outer ramus with 2 large recurved distal robust setae, with 2 lateral robust setae and 3 lateral slender setae; inner ramus with 1 distal slender and 3 lateral robust setae. <i>Telson</i> subtrapezoidal, apically truncated, with small apical cusp on each distolateral corner, with2 pair of oblique medial slender setae, with 2 pair of lateral slender setae, 2 pair of lateral and 1 pair of apical plumose setae. <b>Female</b> (sexually dimorphic characters). Based on paratype, female, 7.0 mm, AM P76768. <i>Gnathopod 1</i> subequal in size to gnathopod 2; basis slightly shorter than coxa, with 1 slender anterodistal seta; dactylus slightly overreaching palm. <i>Gnathopod 2</i> basis anterodistal corner with 2 slender setae; palm straight, with 1 robust seta defining palm; dactylus subequal in length to palm. <b>Habitat.</b> Coral rubble. <b>Remarks.</b> <i>Cymadusa mariabyrneae</i> <b>sp. nov.</b> is most similar to <i>C. aungtonyae</i> Peart 2002 from Thailand, in the form and setosity of male gnathopod 2 propodus. Coxae 2–3 in <i>C. mariabyrneae</i> however, are more subquadrate than in <i>C. aungtonyae.</i> The gnathopod 1 palm is straight in <i>C. mariabyrneae</i> and sculptured in <i>C. aungtonyae</i>. Overall the uropods of <i>C. mariabyrneae</i> are more slender with a greater number of robust setae relative to those of <i>C. aungtonyae</i>. <i>Cymadusa mariabyrneae</i> is superficially similar to the GBR species <i>C. thagaay</i> Peart, 2007a, with respect to the setose anterior margin of the male gnathopod 2. These species differ in two male gnathopod 1 characters: the anterior margin of the coxa which is concave in <i>C. mariabyrneae</i> and straight in <i>C. thagaay</i>; and the propodus palm which is straight in <i>C. mariabyrneae</i> and sinusoidal in <i>C. thagaay</i>. <b>Distribution.</b> <i>Australia</i>. Queensland: One Tree Island (current study).
description: Published as part of <i>Hughes, L. E. &amp; Lowry, J. K., 2009, Ampithoidae *, pp. 153-219 in Zootaxa 2260 (1)</i> on pages 191-194, DOI: 10.11646/zootaxa.2260.1.8, http://zenodo.org/record/5322208
description: {"references": ["Peart, R. A. (2002) New species of Ampithoidae (Crustacea, Amphipoda, Corophioidea) from the eastern Andaman Sea. Phuket Marine Biological Center Special Publication, 23 (1), 229 - 252.", "Peart, R. A. (2007 a) A review of Australian Cymadusa (Crustacea: Amphipoda: Ampithoidae) with descriptions of eight new species. Zootaxa, 1540, 1 - 53."]}