Ampithoe eremits Peart 2007, sp. nov.
Creators: name: Peart, Rachael A.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Amphipoda
Ampithoidae
Ampithoe
Ampithoe eremits

description: <i>Ampithoe eremits</i> sp. nov. (Figs. 11–13) <b>Type material.</b> Holotype: AM P51251, female, ovigerous, 11.0 mm, on algae, Split Solitary Island, Coffs Harbour, NSW, 30°14’30”S 153°10’44”E, 5 Feb 1996, 16 m, I. Takeuchi. Paratypes: AM P51252, male, 10.5 mm, living on red algae, South Solitary Island, Coffs Harbour, NSW, 30°12’19”S 153°15’54”E, 5 Feb 1996, 12 m I. Takeuchi; AM P51253, males and females (5), 8–10 mm, on algae, Split Solitary Island, Coffs Harbour, NSW, 30°14’30”S 153°10’44”E, 5 Feb 1996, 16 m, I. Takeuchi; AM P51254, male and females (3), 8– 10 mm, living on red algae, South Solitary Island, Coffs Harbour, NSW, 30°12’19”S 153°15’54”E, 5 Feb 1996, 12 m, I. Takeuchi. <b>Diagnosis.</b> Antenna 2 robust, better developed than antenna 1, not densely setose on ventral margin. Lower lip with lateral lobe longer than medial lobe. Maxilla 1 inner plate with three slender setae. Gnathopod 1 carpal lobe subacute; carpus subequal in length to the propodus; palm slightly excavate with a small rounded midmedial tooth, with a small subacute posterodistal tooth defining the palm; dactylus subequal in length to the palm. Gnathopod 2 without densely setose margins; basis posterodistal lobe large and rounded, with more than 3 robust setae; carpus subequal in length to propodus; palm acute, excavate without a midmedial tooth, with a small, subacute posterodistal tooth defining the palm, without a defining robust seta; dactylus subequal in length to the palm. Pereopod 3 basis slightly expanded; merus narrow. Pereopods 5–7 weakly prehensile. Pereopod 5 merus subrectangular. Uropod 3 peduncle with 6 distal robust setae, outer ramus shorter than inner ramus, with patch of small conical lateral denticles, with lateral setal fringe; inner ramus with 7 distal robust setae. Telson distally truncate, apical cusps small. <b>Description.</b> Based on paratype, male, 10.5 mm, AM P51252. <i>Head</i> as long as deep. <i>Antenna 1</i> longer than antenna 2; peduncular article 1 longer than article 2 (1.2 x), article 2 longer than article 3 (2.9 x), article 3 shorter than article 1 (0.3 x). <i>Antenna 2</i> robust, better developed than antenna 1; peduncle article 4 longer than article 5. <i>Mandible</i> molar with 6 robust setae in the accessory setal row; palp stout, long, setose along posterior margin, article 1 shorter than article 2 (0.4 x), article 2 subequal to article 3, article 3 longer than article 1 (2.3 x). <i>Lower lip</i> mandibular lobe with curved margins, subacute apically. <i>Maxilla 1</i> palp with apical robust setae. <i>Maxilla 2</i> inner plate narrow, outer plate broader. <i>Maxilliped</i> outer plate with developed setation (robust setae large). <i>Pereon</i>. <i>Gnathopod 1</i> subequal to gnathopod 2, without densely setose margins; coxa larger than gnathopod 2 coxa, slightly produced anteroventrally, anteroventral margin produced, rounded, anterior margin convex or straight without setal fringe; basis shorter than coxa, with sparse slender setae, posterodistal lobe large and rounded, with three robust setae; merus produced to form a small, rounded distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with slender setae only; propodus narrow (length 2.1 x width), ovoid, palm excavate, with small rounded, midmedial tooth, with small, subacute posterodistal tooth defining palm; dactylus subequal in length to palm, inner margin denticulate. <i>Gnathopod 2</i> without densely setose margins; coxa without setal fringe; basis subequal in length to coxa, with sparse slender setae; merus produced to form a short, subacute distoventral lobe, anterior margin with setae absent; carpus longer than merus, subtriangular, anterior margin with slender setae; propodus broad (length 1.8 x width), ovoid, not produced to form an anterodistally setose lobe; dactylus tapering evenly, acute, inner margin denticulate. <i>Pereopod 5</i> basis with marginal robust setae, with medial slender setae; distal articles slender; propodus slightly expanded distally, with 3 distal robust setae; dactylus hooked. <i>Pereopod 6</i> with marginal robust setae, with medial slender setae; basis posterior margin rounded; propodus slightly expanded distally, with 3 distal robust setae; dactylus strongly curved. <i>Pereopod 7</i> with marginal robust setae, with medial slender setae; propodus slightly expanded distally, with 3 distal robust setae; dactylus strongly curved. <i> <i>Pleon</i>. Epimeron 3</i> posteroventral corner narrowly rounded. <i>Uropod 1</i> peduncle with a short setal fringe; inner ramus longer than outer ramus, with 9 marginal robust setae, slender setae absent; outer ramus with 13 marginal robust setae, slender setae absent. <i>Uropod 2</i> peduncle with 6 marginal robust setae, setal fringe absent; rami subequal in length; inner ramus with 13 marginal robust setae, slender setae absent; outer ramus with 13 marginal robust setae, slender setae absent. <i>Uropod 3</i> peduncle longer than broad (1.6 x), short with respect to rami length (2 x), with 2 marginal robust setae, marginal slender setae absent; inner ramus with 7 distal slender setae. <i>Telson</i> with apical slender setae only. <b>Female</b> (sexually dimorphic characters). Based on holotype, female, 11.0 mm, AM P51251. <i>Antenna 2</i> slender, similar to antenna 1, not densely setose on ventral margin; peduncle article 4 subequal to article 5; flagellum 28-30 articulate <i>Gnathopod 1</i> coxa produced anteroventrally, rounded, anterior margin concave; propodus narrow (length 1.6 x width); palm acute, entire, without midmedial tooth, with a single robust setae near inner base of dactylus, with a posterodistal tooth defining palm. <i>Gnathopod 2</i> propodus broad (length 1.8 x width); palm acute, entire, without a midmedial tooth, with a single robust setae near inner base of dactylus, with a small subacute posterodistal tooth defining palm. <b>Etymology.</b> The name is Latin for solitary, alluding to the type locality. <b>Remarks.</b> <i>Ampithoe eremitis</i> <b>sp. nov.</b> is similar to <i>A. caddi</i> Poore &amp; Lowry, 1997 and the species group of <i>A. waialua</i>, J.L. Barnard 1972, <i>A. ngana</i> Poore &amp; Lowry, 1997, <i>A. platycera</i> Sivaprakasam, 1970 and <i>A. hinatore</i> J.L. Barnard, 1972. <i>Ampithoe eremitis</i> and <i>A. caddi</i> both have elongated gnathopods, though differing in structure as follows: the merus of both gnathopod 1 and 2 is produced anteriorly into an acute lobe on <i>A. eremitis,</i> and not so in <i>A. caddi</i>. The palm structure is more similar to that of species of the <i>Ampithoe waialua</i> species group comprising of <i>A. waialua</i>, J.L. Barnard 1972, <i>A. ngana</i> Poore &amp; Lowry, 1997, <i>A. platycera</i> Sivaprakasam, 1970 and <i>A. hinatore</i> J.L. Barnard, 1972. This group shares an excavate palm on gnathopod 1 in males. <i>Ampithoe waialua</i> and <i>A. ngana</i> both have an anteriorly produced merus on both gnathopods 1 and 2. However, <i>A. eremitis</i> differs from <i>A. waialua</i> by having an excavate palm on gnathopod 2, and by having a more excavate gnathopod 1 palm. The female <i>of A. eremitis</i> also differs from the females of <i>A. waialua</i> by having small posterodistal tooth defining the palms of gnathopods 1 and 2. The specimens of this new species are also much larger (10–11 mm) than those of <i>A. waialua</i> (4–5 mm), slightly larger than <i>A. hinatore</i> (7–8 mm) and similar in size to <i>A. ngana</i> (10–13 mm). <b>Habitat.</b> Living on red algae in 12–16 m depth. <b>Distribution.</b> Coffs Harbour, New South Wales, southeastern Australia.
description: Published as part of <i>Peart, Rachael A., 2007, A review of the Australian species of Ampithoe Leach, 1814 (Crustacea: Amphipoda: Ampithoidae) with descriptions of seventeen new species, pp. 1-95 in Zootaxa 1566 (1)</i> on pages 18-22, DOI: 10.11646/zootaxa.1566.1.1, http://zenodo.org/record/5096061
description: {"references": ["Poore, A. G. B. &amp; Lowry, J. K. (1997) New ampithoid amphipods from Port Jackson, New South Wales, Australia (Crustacea: Amphipoda: Ampithoidae). Invertebrate Taxonomy, 11 (6), 897 - 941.", "Barnard, J. L. (1972) The Marine Fauna of New Zealand: Algae-living littoral gammaridea (Crustacea Amphipoda). Memoir of the New Zealand Oceanographic Institute, 62, 7 - 216.", "Sivaprakasam, T. E. (1970) Amphipods of the family Ampithoidae from the Madras Coast. Journal of the Marine Biological Association of India, 12 (1 &amp; 2), 64 - 80."]}