Julmarichardia sp. A

Moralés-Núñez, Andres G. & Heard, Richard W., 2021, Julmarichardiidae, a new apseudoidean family (Crustacea: Tanaidacea: Apseudomorpha) with the description of a new species of Julmarichardia Guţu 1995 from the Northwest Australian Shelf, Zootaxa 5081 (1), pp. 77-115 : 111

publication ID	https://doi.org/ 10.11646/zootaxa.5081.1.3
publication LSID	lsid:zoobank.org:pub:2A63D6CB-4838-45F1-8B2B-60A2F56216D3
DOI	https://doi.org/10.5281/zenodo.5770564
persistent identifier	https://treatment.plazi.org/id/5F1B8791-FFAA-FFB2-C1D1-5ED4FBDEFEE0
treatment provided by	Plazi
scientific name	Julmarichardia sp. A
status

Treatment

( Figs 20B, 20H View FIGURE 20 , 25 View FIGURE 25 )

Material examined. One ♀ with oostegites, TBL 2.7 mm, ( AM P.52212), Stn 06-B7-S, (19°22’00’’S; 118°56’00’’E), depth 54 m, Coll: FRV “ Soela ”, CSIRO 08-December-1983 GoogleMaps .

Description (partial). Body ( Fig. 25A View FIGURE 25 ). Dorso-ventrally flattened, TBL 2.7 mm, about 4.5 times width.

Cephalothorax ( Fig. 25A View FIGURE 25 ). About ~20% of TBL, as long as wide, shorter than combined lengths of pereonites 1–3; rostrum well-developed, spatulate, deflected anteroventrally, margins entire, smooth lacking small denticles and setulate setae ( Fig. 25A–C View FIGURE 25 ); eyes-lobes well defined, pointed, visual elements present. Carapace without row of small spines at basis of rostrum, without small denticles at basis of antennule, without setulate setae along middorsal margin ( Fig. 25A–C View FIGURE 25 ).

Pereon ( Fig. 25A View FIGURE 25 ).About ~50% of TL, all pereonites wider than long, each with antero-posterior lateral margins having very small denticles; pereonite-1 widest; pereonite-4 longest; pereonite-6 shortest; pereonites 1–6 each with one to three setulate setae on proximal and distal margins; pereonites 1–5 with two small setulate setae on middorsally.

Pleon ( Fig. 25A View FIGURE 25 ). About ~20% of TL, combined lengths of pleonites 1–5 longer than pereonites 5–6; all pleonites sub-equal, wider than long, bearing pleopods; each pleonite with lateral margins armed with denticulate triangulate-like lateral process bearing several plumose setae at or near apex; each pleonite with plumose seta on lateral margins; pleonites 1–4 with four (two proximal and two distal) small simple setae on mid-dorsal margin; pleonite-5 with two plumose setae on disto mid-dorsal margin.

Pleotelson ( Fig. 25A View FIGURE 25 ). About ~10% of TBL, longer than pereonite-6; sub-distal anterior dorsolateral margin with two small plumose setae, with four plumose setae on sub-distal posterior dorsal margin, with dorso sub-distal plumose seta close to the insertion with uropod at each site, with small rounded apical lobe; antero-laterally with narrow apophysis bearing plumose seta on dorsal margin and plumose seta distally, and postero-laterally apophysis bearing plumose seta.

Antenna ( Figs 20B View FIGURE 20 , 25D–E View FIGURE 25 ). With ten articles, distinctly shorter than antennule. Article-1 (not illustrated) with prominent spatulate process on inner margin. Article-2 about 2.9 times longer than wide; inner dorsal margin with ~12 translucent acute or subacute apophyses of varying lengths ( Fig. 25E View FIGURE 25 ) and three plumose setae (not illustrated); inner ventral margin with proximal rounded process (beneath the spatulate process of article-1) bearing three plumose setae, with ~six translucent acute or subacute apophyses of varying lengths, and three plumose setae ( Fig. 25D View FIGURE 25 ); outer distodorsal margin with small simple seta; squama present, longer than article-3, with three distal simple setae of varying lengths. Article-3 1.5 times longer than wide, inner distal margin with long simple seta. Article-4 about 1.8 times longer than wide; inner sub-distal margin with plumose seta. Article-5 about 3.7 times longer than wide, slightly shorter than articles 3–4 combined; inner margin with long simple seta and PSS; mid and sub-distal margins with one PSS; outer distal margin with two PSS. Article-6 short, asetose. Article-7 about 2.4 times longer than wide; inner margin with distal simple seta. Article-8 about 3.7 times longer than wide; mid inner margin with PSS; outer distal margin with simple seta and PSS. Article-9 same length than article-8; inner distal margin with simple seta; medial distal margin with simple seta; Article-10 same length as article-9, with four distal setae of varying lengths.

Pereopod-1 (no illustrated). Fossorial, strongly developed, with mucus packets in merus, carpus, and propodus. Coxa, excluding anterior process, sub-quadrate; distoventral margin with four small simple setae and small denticles adjacent to base of coxal process; distodorsal margin with simple seta and translucent rounded apophysis; inner face with row of ten simple setae; coxal process well-developed, triangular, having length about twice width, becoming distally attenuated, terminating in acute tip; ventral margin asetose; dorsal margin with four translucent acute or subacute apophyses and four setulate setae, distal most buttressed and largest. Exopod with three articles, third article bearing six plumose setae.

Remarks. The adult female of Julmarichardia sp. A available for this study in most aspects resembles those of J. gutui and J. magdae by having a rostrum well-developed, spatulate, and deflected anteroventrally. However, Julmarichardia sp. A closely resembles J. magdae by having the pereopod-1 with an acute coxal process. Julmarichardia sp.A ,, is also distinct from J. gutui , J. magdae , and other members of the genus by having the margins of its rostrum entire and smooth, lacking small denticles and/or setulate setae characteristic of these others.

We considered describing Julmarichardia sp. A as a new species because of its apparent unique combination of characters exhibited. However, since only a single specimen was found exhibiting these features, we cannot confirm whether Julmarichardia sp. A belongs to an undescribed species or if the lack of the rostral denticles and/or setulate setae is an abnormality or the result of recent moulting. Nevertheless, the distribution of J. magdae , Julmarichardia sp. A , and J. gutui suggests the possibility of additional species of the genus may be segregated along the shallower or deeper depth and sediment gradients across the NW Australian Continental Shelf.