Paraugaptiloides mirandipes, Ohtsuka & Nishida & Machida, 2005
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publication ID |
https://doi.org/ 10.1080/00222930500087408 |
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persistent identifier |
https://treatment.plazi.org/id/03E0481B-FFCD-FF8E-D781-5590FBFC2F62 |
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treatment provided by |
Felipe |
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scientific name |
Paraugaptiloides mirandipes |
| status |
sp. nov. |
Paraugaptiloides mirandipes n. sp.
( Figures 7–10 View Figure 7 View Figure 8 View Figure 9 View Figure 10 )
Material examined
Adult male (holotype), collected from the central Sulu Sea (08 ° 52.669N, 120 ° 25.289E, 08 ° 53.979N, 120 ° 25.509E; depth 2430–2450 m) with NORPAC net set on OBT; 7 December 2002; appendages mounted on glass slides, and body proper in vial; NHM 2005.160 GoogleMaps .
Description
Male (holotype). Body ( Figure 7A, B View Figure 7 ) 5.26 mm, relatively weakly chitinized except for leg 5; prosome approximately 2.3 times as long as urosome. Cephalosome produced posterolaterally to cover anterior part of first pediger ( Figure 7B View Figure 7 ); rostrum ( Figure 7C View Figure 7 ) produced posteriorly, with pair of long filaments (one accidentally lost during dissection). Second and third pedigers produced mediodorsally; fifth pediger produced posteriorly at each side into irregular processes furnished with glandular openings and hair-like sensillae; posterior margin of processes fringed with fine setules ( Figure 7A, B, D–G View Figure 7 ); large spermatophore visible, extending from first pediger to genital somite ( Figure 7A View Figure 7 ). Urosome five-segmented; genital somite with gonopore opening at right posterolateral corner ( Figure 7A, B View Figure 7 ); second and third urosomites almost equal in length; anal somite relatively conspicuous; caudal rami ( Figure 7A, H View Figure 7 ) symmetrical, fringed with long setules on both sides; rudimentary seta I present, seta V longest.
Left geniculate antennule ( Figure 8A–F View Figure 8 ) consisting of 19 segments, with first (I–IV) and second (V) posteriorly fringed with fine setules; first to fifth (VIII) segments each with square plate-like structure posterodistally; geniculation positioned between segments 17 (XX) and 18 (XXI–XXIII); large anterodistal process originating from compound segment XXIV–XXV, reaching beyond antennulary tip; terminal three segments corresponding to ancestral XXIV–XXVIII incompletely fused with fusion lines visible clearly. Fusion pattern and armature as follows: I–IV (1)56+4ae (two elements missing in Figure 8A View Figure 8 ), V (2)52+ae, VI (3)52+ae, VII (4)52+ae, VIII (5)52+ae, IX (6)52+ae, X (7)51+process +ae, XI (8)52+ae, XII (9)51+process+ae, XIII (10)51+process+ae, XIV (11)52+ae, XV (12)51+process+ae, XVI (13)52+ae, XVII (14)52+ae, XVIII (15)52+ae, XIX (16)51+process ( Figure 8C View Figure 8 )+spine ( Figure 8D View Figure 8 )+ae, XX (17)51+process ( Figure 8E View Figure 8 )+ae, XXI–XXIII (18)52 (one rudimentary)+2 processes+ae, XXIV–XXVIII (19)512+process +2ae (see Figure 8F View Figure 8 : XXIV51+1+process; XXV51+1+ae; XXVI–XXVIII58+ae), Right antennule 23-segmented, reaching to anal somite (see Figure 7B View Figure 7 ). Antenna ( Figure 7I–K View Figure 7 ) with unarmed coxa; basis with inner seta terminally; endopod two-segmented, first segment unarmed, second segment with three inner setae of unequal length and one reduced and five well-developed terminal setae ( Figure 7K View Figure 7 ); exopod ( Figure 7I, J View Figure 7 ) indistinctly sevensegmented, setal formula 0, 1, 1, 1, 1, 1, 3 (one vestigial).
Mandible ( Figure 8G View Figure 8 ) with two mono- and one tricuspid teeth and two patches of setules along cutting edge; patch of long setules present near base of palp; endopod absent, but possibly represented by round prominence; exopod five-segmented, setal formula with 1, 1, 1, 1, 2. Maxillule ( Figure 8H View Figure 8 ) with praecoxal arthrite bearing five serrate spines and one process; coxal endite with one serrate seta; coxal epipodite with eight setae, two of which relatively short; basis with two rows of long setules and vestigial seta; endopod onesegmented, bulbous, with two serrate unequal setae terminally; exopod one-segmented, lobate, with three long setae terminally. Maxilla ( Figure 9A View Figure 9 ) with first praecoxal endite bearing two setae and one rudimentary element; second praecoxal to second coxal endites each with two serrate setae; basis bearing long spine ( Figure 9B View Figure 9 ) with longitudinal row of fine spinules; endopod indistinctly four-segmented, all setae on which well developed, with setal formula 1, 3, 2, 2. Maxilliped ( Figure 9C–E View Figure 9 ) with syncoxa bearing one middle and two subterminal serrate setae and subterminal patch of minute spinules; basis as long as syncoxa, with two serrate setae and longitudinal patch of fine spinules; first endopodal segment nearly incorporated into basis, with serrate seta; second to fifth endopodal segments bearing four, four, three and three setae, respectively; fifth endopodal segment slightly longer than preceding segment; terminal endopodal segment with setae a and b rudimentary.
Seta and spine formula of legs 1–4 ( Figure 9F–I View Figure 9 ) as in Protoparamisophria biforaminis . Legs 1–4 with both rami three-segmented. Leg 1 ( Figure 9F View Figure 9 ) with basis bearing anterodistal row of minute spinules near base of endopod; first endopodal segment with patch of fine setules anterodistally; outer spines on second and third exopodal segments weakly chitinized. Legs 2 ( Figure 9G View Figure 9 ) and 3 ( Figure 9H View Figure 9 ) similar except for shape of distal outer process on second endopodal segment. Leg 4 ( Figure 9I View Figure 9 ) with round prominence at inner distal corner of basis.
Leg 5 ( Figure 10 View Figure 10 ) highly complex, enlarged, and heavily chitinized; coxae and intercoxal sclerite completely fused. Left leg with basis bearing plumose subterminal seta on posterior surface; endopod distinctly two-segmented, located near inner distal corner of basis, first segment diamond-shaped, second segment originating from inner midpoint of preceding segment; exopod three-segmented, first segment elongate, with minute element at outer distal corner; second segment massive, expanded outwards; third segment strongly curved, bearing proximal short seta, middle curved spine with spatulate tip ( Figure 10C View Figure 10 ), and terminal bifurcate process. Right leg with basis bearing plumose seta on posterior surface; endopod one-segmented with broad base along inner margin of basis, furnished with fine setules subterminally on posterior surface; exopod indistinctly three-segmented, first segment curved inwards at mid-length, carrying two round processes on anterior surface and triangular outer distal process with fine seta; second segment extremely elongated, as long as basis and first exopodal segment combined, inserted on inner subterminal corner of preceding segment, and bearing short seta at mid-length of inner margin, distal patch of fine setules and subterminal round process with minute spinule at tip; third segment lamellar with three minute setae along distal margin.
Remarks
The new species is easily distinguishable from P. magnus (features in parentheses) as follows: (1) prosomal posterior corners irregularly pointed (not irregular); (2) three inner setae on the second endopodal segment of the antenna (only two); (3) absence of the mandibular endopod (one-segmented, with two terminal setae); (4) absence of a vestigial element on the inner distal corner of coxa of leg 4 (present); (5) third exopodal segment of the left fifth leg bearing three heavily chitinized processes (only two); (6) endopod of the right fifth leg well developed (relatively reduced); (7) proximal two exopodal segments of the right fifth leg extremely elongated (relatively compact).
Unidentified ciliates were attached near the distal patch of fine setules of the second exopodal segment of the right fifth leg (not illustrated in Figure 10A View Figure 10 ).
Etymology
The specific name of the new species, mirandipes (Latin mirandus, meaning surprising, plus Latin pes meaning leg), refers to the highly complex, enlarged fifth legs of the male.
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