Apseudes manna, Bamber, 2008
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publication ID |
https://doi.org/ 10.1080/00222930701850505 |
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persistent identifier |
https://treatment.plazi.org/id/3D5587B8-FFBC-FFAD-DC1B-FA6FFA8ABCD6 |
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treatment provided by |
Felipe |
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scientific name |
Apseudes manna |
| status |
sp. nov. |
Apseudes manna View in CoL sp. nov.
( Figures 1–3 View Figure 1 View Figure 2 View Figure 3 )
Material
One brooding female, holotype (NHM.2003.8), one subadult male (paratype, dissected); Telegraph Bay , sample no. 6, Cape d’Aguilar, Hong Kong . 22 ° 129200N
114 ° 159100E; sediment 6% gravel, 63% sand, 31% silt/clay, depth 9 m. Coll. N J Evans and P F Clark, 19 October 2002.
Description
Typical small Apseudes , holotype ( Figure 1A View Figure 1 ) 4 mm long, cephalothorax about as long as wide, with conspicuous pointed rostrum, eyelobes present with spine-like anterior apophyses, eyes present; single mid-lateral seta. Pereonite 1 contiguous with cephalothorax, half as long as wide; spinose apophysis of coxa of pereopod 1 conspicuous. Pereonites 2 to 6 respectively 0.55, 0.7, 0.9, 0.75 and 0.7 times as long as wide, all without lateral emarginations or apophyses; anterolateral and posterolateral corners with three or four simple setae; dorsally with one or two pairs of simple setae. Five free pleonites with sparse dorsal setae, together as long as maximum width; pleon tapering. Pleotelson slightly longer than wide, quadrangular, with pair of distal setae, uropod insertion laterodistal. No hyposphenia evident (brood pouch not removed).
Antennule ( Figure 1B View Figure 1 ) with 4-articled peduncle, second article with distal ‘‘crown’’ of setae, second and third articles subequal; main flagellum of 10 segments, with aesthetascs on segments 6 and 8; accessory flagellum of 5 segments. Antenna ( Figure 1C View Figure 1 ) with 5-articled peduncle, first article simple, second article with rugose proximal outer margin and bearing squama with seven marginal and two submarginal setae; fifth article as long as second; flagellum of eight segments.
Mandibles ( Figure 1D View Figure 1 ) with roundly dentate pars mandibularis, spiniferous lobe with five spines, one bifurcate, pars molaris well developed, lacinia mobilis on left mandible. Palp 3-articled, proximal and distal articles subequal, second article 1.5 times as long as either; each article with group of short, stout setae, longer setae proximal on article 1, medial on article 2, distal on article 3.
Labium ( Figure 1E View Figure 1 ) with few distal setae, outer margin denticulate, terminal lobe (palp) with fine lateral setae and three stout distal setae. Maxillule ( Figure 1F View Figure 1 ) inner endite with four plumose distal setae and projecting outer margin; outer endite with 10 distal spines and setose outer margin medially denticulate; palp of two articles with apparently three distal setae (broken in preparation). Maxilla typical of genus with simple setae.
Maxilliped ( Figure 1G View Figure 1 ) basis with incurved outer margin; palp of four articles, proximal article with long inner spine as long as second article; second and third articles densely setose; distal article with wide setae; endite distally with simple setae including inner caudo-distal seta; two coupling-hooks. Epignath simple, elongate.
Cheliped ( Figure 2A View Figure 2 ) generally slender; basis robust with exopodite bearing plumose setae, and with group of three simple tergal setae and central sternal spine; merus less than half length of carpus, these two articulating anaxially; carpus four times as long as wide; propodus fixed finger about as long as palm, with setose cutting edge, dactylus as long as fixed finger, with simple cutting edge, claw with secondary denticulation.
Pereopod 1 ( Figure 2B View Figure 2 ) coxa with large, setose spiniform prolongation; basis with exopodite, with proximal group of three short, simple tergal setae and with three sternal blunt spines, proximal one oriented proximally. Merus, carpus and propodus subequal in length. Merus with longer tergal and shorter sternal distal spines, carpus with two sternal and one tergal blunt spines; propodus with five sternal spines, serrate dactylus with paired tergal fine setae, two tergal spines, spines interspersed with fine setae, comb-like seta at base of dactylus.
Pereopod 2 ( Figure 2C View Figure 2 ) with long setae, basis 3.5 times as long as wide; merus, carpus subequal in length, merus with long tergal distal spine and paired sternal spines, carpus with distal tergal group of long setae and distal sternal spine; propodus longer than carpus, with three sternal spines, short midlateral spine; dactylus plus claw slender, curved, as long as propodus, with paired tergal fine setae and smaller distal sternal seta at base of claw. Pereopod 3 ( Figure 3A View Figure 3 ) similar to pereopod 2, but carpus with distal spines rather than setae; propodus and dactylus subequal, each longer than subequal merus and carpus; propodus distally with paired spines tergal to dactylus with finely serrate inner margin. Pereopod 4 ( Figure 3B View Figure 3 ) basis stout (2.4 times as long as wide), carpus nearly twice as long as merus and with distal crown of blunt spines and paired sternal spines; propodus distally with short spines and longer, blunt spine with sternal serration, dactylus plus claw shorter than propodus. Pereopod 5 ( Figure 3C View Figure 3 ) in similar proportions to pereopod 4, carpus and propodus simply spinose sternally, with six serrate distal spines.
Pereopod 6 ( Figure 3D View Figure 3 ) basis with row of sternal plumose setae, simple tergal setae and simple distal sternal setae; merus with sternal distal spine and three long, plumose tergal setae; carpus with seven long, plumose tergal setae; propodus with sternal row of some 24 flattened, serrate, blade-like setae, dactylus plus claw as long as propodus, with adjacent serrate distal spines.
All five pairs of pleopods similar ( Figure 3E View Figure 3 ), basis with four sternal and five tergal setae; rami uniarticulate, exopodite shorter than endopodite, all setae plumose. Uropod basis longer than wide, exceeding distal tip of telson, glabrous; exopodite of four or five segments; endopodite with numerous segments with indistinct articulation, whole uropod as long as pereon.
The holotype was carrying 20 eggs in her brood pouch; the paratype bore a blunt penial tubercle ventrally on pereonite 6.
Etymology
Named in gratitude to Manna Wan for her diverse endeavours during the October 2002 Hong Kong Caves Expedition
Remarks
Records from the South China Sea region (see citations in Introduction) list only three species of Apseudes (two of the ‘‘ Apseudes ’’ species of Shiino 1963 and that of Bamber 1997 having been moved to other genera); A. manna sp. nov. is unlike any of these. The only species of Apseudes previously recorded from Hong Kong waters ( Bamber 2000) was A. gallardoi Shiino, 1963 , which is easily distinguished owing to its having conspicuous spinose apophyses on the inner margin of peduncle article 1 of the antennules and bilobate lateral margins to the pereonites.
In size and gross appearance, as well as meristics of the antennae and limbs, the present species bears some similarity to A. nagae Shiino, 1963 (known from Vietnam and Sabah), but that species also has lateral emarginations in its pereonites, as well as a proportionately longer pleotelson, normal setae on its mandibular palp and is blind ( Shiino 1963; Bamber 1998). Apseudes manna is unusual in its generally simple setation of all mouthparts except for the short, blunt setae on the articles of the mandibular palp.
Apseudes manna sp. nov. was found nowhere else during the October 2002 sampling. The other tanaidaceans recorded were Pakistanapseudes hodgsoni Bamber, 2000 and Tanapseudes ormuzana Bãcescu, 1978 from the sedimentary benthos of Conic Island Cave (only), and Paratanais clarkae Bird & Bamber, 2000 , Charbeitanais spongicola Bamber & Bird, 1997 , Leptochelia lusei Bamber & Bird, 1997 and Gollumudes mortoni ( Bamber 1997) from epifaunal (sponge or crevicial) communities.
The genus Gollumudes Bamber, 2000 , was originally assigned to the Parapseudidae owing to the lack of a coxal apophysis on the first pereopod (a defining character of the Apseudidae ), inter alia. Guţu (2001) described as new Gollumudes botosaneanui , a species with a conspicuous spine-like coxal apophysis on the first pereopod ( Guţu 2001). He reassigned the genus to the family Apseudidae , and presumed such an apophysis ‘‘of small dimensions’’ was present in G. mortoni , the type species. Examination of one of the specimens collected from Conic Island Cave has confirmed that the coxa of pereopod 1 is wider anteriorly than the proximal end of the basis and bears two distal setae, but has no such apophysis ( Figure 4 View Figure 4 ). That Gollumudes should be classified within the Apseudidae is entirely reasonable, and rather illustrates the invalidity of classifying a family simply on the presence of a coxal apophysis (known to show intrageneric variation in, for example, Calozodion ; see Guţu 1989).
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