Akrophryxus pallipalicus, Williams & Boyko & Moritaki, 2022
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publication ID |
https://doi.org/ 10.12782/specdiv.27.227 |
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publication LSID |
lsid:zoobank.org:pub:BE0F7ECC-B2B4-41D9-A62B-287D0ECB1C6A |
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persistent identifier |
https://treatment.plazi.org/id/6034AC68-B321-44EF-BD61-220950020C23 |
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taxon LSID |
lsid:zoobank.org:act:6034AC68-B321-44EF-BD61-220950020C23 |
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treatment provided by |
Felipe |
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scientific name |
Akrophryxus pallipalicus |
| status |
sp. nov. |
Akrophryxus pallipalicus View in CoL sp. nov.
( Figs 6–8 View Fig View Fig View Fig )
Material examined. Holotype: mature female ( ZRC 2022.0001 View Materials ; 1.8 mm diameter) attached to left antennule of female Parapalicus armatus Castro, 2000 (type host, ZRC 2016.0412 View Materials ; 9.0 mm CL, 11.9 mm CW), Sta. CP 4152, 16°2′N, 113°53′E – 16°5′N, 113°55′E, Macclesfield Bank ( Zhangsha Island ), South China Sea (type locality), 410–412 m, beam trawl, flat rocky bottom, coll. ZhongSha 2015, 27 July 2015, host identified by P. Castro, July 2016. GoogleMaps
Allotype: mature male ( ZRC 2022.0002 View Materials ; 0.54 mm), same data as for holotype. GoogleMaps
Etymology. The species name is a compound noun in apposition of the Latin pallium (covering) and the second part of the genus name of the host.
Description of female. Body spheroid, length and width nearly equal (maximal diameter in lateral view= 1.8 mm) ( Figs 6 View Fig , 7A–C View Fig ). Cephalon externally indistinguishable from pereon, without eyes. Antennules absent, antennae each as recurved flat plate lateral to oral cone, covered with minute scales (not shown) ( Fig. 7E View Fig ). Oral cone round- ed ( Fig. 7E View Fig ); mouthparts indistinct. Maxillipeds ovate with recurved digitiform extension ( Fig. 7F, G View Fig ), extending into groove of oostegite 1. Pereopods 1–5 subequal in size and shape ( Fig. 7D, J, K View Fig ); recurved dactylus short with setae and scales on ventral surface, propodus carpus and merus partly fused, ischia and bases stout ( Fig. 7J, K View Fig ). Oostegite 1 largest ( Fig. 7H, I View Fig ), broadly ovate with small posterior accessory lobe, broad lobe medially divided in lateral view ( Fig. 7H View Fig ); oostegites 2–4, progressively larger, thin and closely applied to each other ( Fig. 7D View Fig ); oostegites 2 and 3 subrectangular, expanded posteriorly with small setae distally, oostegite 4 subquadrate, small setae on medial and posterior margins, oostegite 5 absent or extremely reduced. Pleon modified (see Remarks under A. acinaces sp. nov.) as oblong, narrow, thickened plate ( Figs 6C, D View Fig , 7A–D View Fig ) partially surrounding host antennule ( Figs 6A, B View Fig , 7A–D View Fig ) with two large circular medial holes: largest surrounding antennule of host and closest to mouthparts of parasite, smaller hole farthest from mouthparts of parasite ( Fig. 7B View Fig ).
Description of male. Body not recurved ventrally ( Fig. 8A View Fig ). Cephalon fused with pereomere 1, anterior margin rounded and inflated dorsoventrally ( Fig. 8A, B View Fig ), posterolateral margins evenly rounded, slightly expanded at proximolateral corners; lacking eyes, cephalic slits present ( Fig. 8A View Fig ). Antennules reduced, broadly conical, apparently of one segment ( Fig. 8C View Fig ); antennae of two segments, basal segment subquadrate, distal segment elongate, tapering ( Fig. 8C View Fig ). Oral cone triangular ( Fig. 8C View Fig ). Pereomeres 2–6 distinct, 3 and 4 subequal in width, others slightly narrower ( Fig. 8A, B View Fig ); pereomere 7 partly fused with pleon, lateral margins of all pereomeres recurved ventrally ( Fig. 8B View Fig ). Pereopods subequal in size and shape, all segments distinct; dactyli of all pereopods subequal, short and slightly recurved; propodi narrow, longer than wide; carpi ovate, each with small distoventral projection; meri ovate; ischia and bases cylindrical, elongate, ischia narrower than bases ( Fig. 8D View Fig ); pereopod 7 lacking. Pleon (undergoing molt) compact, rounded, all segments fused and fused with pereomere 7, rounded posteriorly; anal slit and pleopods lacking ( Fig. 8B View Fig ).
Remarks. See Remarks under A. acinaces sp. nov. for a discussion of the characters that distinguish A. pallipalicus sp. nov. from that species as well as the type species, A. milvus . The female had eggs (0.12± 0.01 mm, n=29; across long axis) within the marsupium.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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