Paratya whitemae, Suter & Mynott & Crump, 2022

Suter, Phillip J., Mynott, Julia H. & Crump, Megan, 2022, New species of Paratya (Decapoda: Atyidae) from Australian inland waters - linking morphological characters with molecular lineages, Memoirs of Museum Victoria (Mem. Mus. Vic.) 81, pp. 55-122 : 87-92

Paratya whitemae n. sp.

Figures 18– 20

http://zoobank.org/urn:lsid:zoobank.org:act:24D43065-1D31-

42BC-A846-7BFB163778AB

Lineage 6 ( Cook et al., 2006)

Lineage A ( McClusky, 2007)

Type Material: Holotype New South Wales. The Falls at Forest Falls Retreat Johns R, − 31.709 S, 152.6612 E, 31 October 2011 ( MC, JM, PS); Body in ethanol and antennae, mouthparts, pereiopods and abdominal structures dissected, mounted on 2 slides. Accession Ref. MC108 , AM Ref No. P. 105604.

Paratypes: New South Wales. The Falls at Forest Falls Retreat Johns R, − 31.709 S, 152.6612 E, 31 October 2011 ( MC, JM, PS) Male , Accession Ref MC110 , Genbank Registration OL 420801; Bagnall’s Lagoon , Albury , − 36.070 S, 146.854 E, April 2011 Accession Ref. MC95 , 97 , 99 ( PS) Genbank Registration OL 420871, OL420872, OL420874; Wakool Reserve , − 35.4963 S, 144.4541 E, June 2011 ( JC); Nepean R at Maldon Weir , − 33.7414 S, 150.6846 E, 5 April 2011 Accession Ref. MC37 ( SW), Genbank Registration OL 420834; Nepean R at Macquarie Grove Rd , − 34.0414 S, 150.6953 E, 2 April 2011 Accession Ref. MC34 ( SW), Genbank Registration OL 420834 ; Bedford Ck − 33.75 S, 150.447 E Accession Ref. MC31 ( SW), Genbank Registration OL 420830; Hawkesbury R at Wilberforce , − 33.5702 S, 150.8382 E, 21 April 2011 Accession Ref. MC24 ( SW), Genbank Registration OL 420824; O’Hares Ck near George R, − 34.095 S, 150.835 E, 20 April 2011 Accession Ref. MC21–23 ( SW), Genbank Registration OL 420821–OL420823; bodies in ethanol and other structures dissected, mounted on 2 slides each .

Material Examined: New South Wales: Bagnall’s Lagoon, Albury , − 36.070 S, 146.854 E, April 2011 ( PS); Murray R below Lake Hume, − 36.0998 S, 147.0228 E, 12 Aug 2010 ( JW, MC, JM); Wakool Reserve , − 35.496 S, 144.454 E, June 2011 ( JC); Nepean R at Maldon Weir , − 33.7414 S, 150.6846 E, 5 April 2011 ( SW); Nepean R at Macquarie Grove Rd , − 34.0414 S, 150.6953 E, 2 April 2011 ( SW) ; Bedford Ck , − 33.75 S, 150.447 E, 4 May 2011 ( SW); Hawkesbury R at Wilberforce , − 33.5702 S, 150.8382 E, 21 April 2011 ( SW); O’Hares Ck near George R , − 34.095 S, 150.835 E, 20 April 2011 ( SW); Woolgoolga Ck, − 30.1306 S, 153.1378 E, ( BM), Way Way Ck, − 30.7681 S, 153.1378 E, ( BM); Nambucca Ck , − 30.6408 S, 152.8558 E, ( BM); Bellinger R , − 30.4261 S, 152.7794 E, ( BM); The Falls at Forest Falls Retreat Johns R , − 31.709 S, 152.6612 E, 31 October 2011 ( MC, JM, PS); Jerrys Ck near Forest Falls Retreat Johns R , − 31.7146 S, 152.6625 E, 30 October 2011 ( MC, JM, PS); The Cascades at Forest Falls Retreat Johns R , − 31.70 S, 152.655 E, 31 October 2011 ( MC, JM, PS); Williams R at Cooreei Bridge Dungog, − 32.3968 S, 151.7631 E, 29 October 2011 ( MC, JM, PS); Trimble Ck in Shoalhaven catchment, − 34.6847 E, 150.5252 S, 26 September 2017 ( PS, JM. JH); Small Ck on Kangaroo Valley Rd, Kangaroo Valley , − 34.7229 S, 150.5293 S, 27 September 2017 ( PS, JM, JH); Lake Yarrunga at Bendeela Recreation Area , − 34.7398 S, 150.4705 E, 27 September 2017 ( PS, JM, JH); Manning R at Wingham Brush , − 31.8706 S, 152.3825 E, 16 September 2016 ( BM); Kangaroo R Hampden Bridge, − 34.7272 S, 150.5218 E, 27 September 2017 ( PS, JM. JH); Lachlan R at Glenmore, − 33.4413 S, 145.5377 S, July 1999, ( PS, TC); Lachlan at Cargellico − 32.2033 S, 146.3589 E, June 1999, ( PS, TC); Orara R at Nana Glen , − 30.1328 S, 153.0077 E, no date, (BK); Hawksbury R at Sackville Ferry, − 33.5003 S, 150.8746 S, 19 September 2020 ( SW); Stream on Gerrigong Ck Rd, Upper Kangaroo Valley , − 34.6870 S, 150.6000 E, 27 September 2017 ( PS, JM. JH); Dingo Ck , − 30.3103 S, 152.9822 E, 24 May 2015 ( BM); Ellenborough R at Ellenborough Falls, − 31.6113 S, 152.2925 E, 31 October 2011 ( PS, JM, MC); Blaxland Ck on Armidale Rd , − 28.8997 S, 152.7864 E, 8 December 2011 ( JW, DB) .

Diagnosis: P. whitemae differs from all other species by the following combination of characters: rostrum long, extending beyond both antennular peduncle and scaphocerite, dorsal edge very slightly concave and curved upwards, dorsally armed with 20–34 teeth, 1–4 postorbital spines, ventrally with 4–11 large serrations over a length of 1.30–2.80 mm, extending from just posterior to greatest depth; distal half of ventral edge straight; left mandible with 4–5 teeth separated by finely ridged U-shaped notch from a short blunt/acute apical tooth; right mandible with 3–4 teeth in a single incisor process; exopod of maxilliped 2 1.63–2.96 times longer than endopod; maxilliped 3 with medial distal margin of apical segment of endopod with 7–11 broad teeth-like spines, outer margin with 1–3 broad teeth-like spines, exopod long and narrow, tip over-reaching distal end of basal endopod segment; pereiopod 1 with long carpus and short and broad chelae, exopod extending to base–apex of carpus; pereiopod 2 with exopod extending to mid merus to base of carpus; dactylus of pereiopod 3 with prominent terminal claw and 7–11 strong spines on medial margin, exopod extends to mid merus; dactylus of pereiopod 4 prominent terminal claw and 8–11 spines on medial margin, exopod extends to mid merus; dactylus of pereiopod 5 with prominent terminal claw and very regular comb-like row of 81–94 small spines on medial margin, exopod extends to basal third of merus.

Carapace length 5.7 (4.5–6.6) mm.

Rostrum long 6.82 (4.55–6.82) mm, extending beyond the antennular peduncle and scaphocerite (fig. 18a), rostral length longer than carapace 1.2 (0.83–1.26) times length of carapace, shape long and slender with dorsal edge curved upwards, pointed, rostrum 8.52 (5.53–9.57) longer than rostral width; dorsally armed with 33 (20–34) teeth, ratio of number of dorsal spines to length is 4.84 (3.68–6.15), 2 (1–4) postorbital eye spines (fig. 18a); ventrally with 6 (4–14) large spines over a length of 1.88 (1.30–2.80) mm, with 1–2 spines posterior to greatest width (fig. 18a), distal half of ventral edge straight; ratio of ventral spine row length to rostral length is 0.28 (0.23–0.46) and 4.57 (2.43–5.80) times more dorsal spines than ventral spines; rostral length 1.38 (1.04–1.77) times length of scaphocerite.

Antenna 1 (fig. 18b) peduncle short 3.05 (3.05–5.28) mm, not reaching distal tip of scaphocerite, length 0.62 (0.62–1.12) times as long as scaphocerite. Stylocerite 1.97 (1.60–2.64) mm long, length 0.35 (0.32–0.51) times carapace length, reaching beyond distal border of peduncle segment and middle to just beyond process on first segment (fig. 18b).

Antenna 2 (fig. 18c) second segment of peduncle 1.03 (1.03–1.80) mm, 0.21 (0.21–0.45) times length of scaphocerite, length 2.50 (2.35–3.75) times width. Scaphocerite 4.94 (3.10– 5.20) mm long, 0.87 (0.69–0.96) times carapace length, 2.93 (2.93–3.85) times as long as wide,

Mouthparts. Left mandible (fig. 18d, e) with 4–5 teeth separated by slightly ridged shallow U-shaped notch from a short blunt/acute apical tooth; spine row immediately below incisor process of 7–9 rugose spines (lifting spines); spine row above molar process of approximately over 40 sparsely setose spines. Right mandible (fig. 18f, g) with 3–4 robust teeth in incisor process with 2 central teeth larger than apical and inner teeth; spine row immediately below teeth with 8–12 spines each finely setose basally; spine row above molar process. Molar process ridged.

Maxilla 1 as for P. australiensis (fig. 18h).

Maxilla 2 as for P. australiensis (fig. 18i).

Maxilliped 1 as for P. australiensis (fig. 18j).

Maxilliped 2 (fig. 18k) endopod 1.40 (0.87–1.40) mm long; exopod long and narrow, length 2.56 (1.73–2.87) mm, exopod 1.82 (1.63–2.96) times longer than endopod. Epipodite with long podobranch extending to basal third of third segment of endopodite.

Maxilliped 3 (fig. 19a) endopod length 7.0 (4.85–8.3) mm, 3.38 (2.32–3.38) times longer than exopod; with 3 distal segments of similar length; basal segment curved, apical segment with large terminal claw, inner margin with 9 (7–11) broad teeth-like spines, largest 2–4 in basal half, outer margin with 1 (1–3) long teeth-like spines near terminal spine and a single spine on outer margin; several transverse spine rows near base; mid and basal segments with several short simple setae. Exopod 2.07 (1.63–2.85) mm long, narrow, tip over-reaching distal end of basal endopod segment.

Thoracic appendages. Pereiopod 1 (fig. 19b) short, 5.85 (3.56–5.85 mm), 1.03 (0.73–1.03) times carapace length. Chelae short and broad (fig. 19b), 1.6 (1.09–1.67) mm long, 2.59 (2.48– 3.84) times as long as wide, 2.0 (1.82–2.48) times longer than dactylus; palm length 1.55 (1.55–2.25) longer than palm width and 1.22 (0.82–1.22) times dactylus length. Carpus short, 2.88 (2.10–2.88) times longer than greatest width. Segment ratios 0.61 (0.55–0.68): 1.22 (1.14–1.49): 1.00 (1.08 [0.87–1.40] mm): 1.60 (1.11–1.60): 0.64 (0.30–0.64): – (2.26–2.60). Exopod extending to base–apex of carpus.

Pereiopod 2 longer than pereiopod 1, 7.23 (5.41–7.83) mm long, 1.28 (1.11–1.47) times carapace length. Chelae long and slender (fig. 19c), 1.60 (1.20–1.80) mm long, half to two-thirds length of carpus, 3.47 (3.43–4.33) times as long as wide, palm length 2.04 (1.5–2.50) times palm width and 0.87 (0.86–1.29) times dactylus length. Propodus 1.48 (1.39–1.91) times longer than dactylus. Carpus 6.54–7.48 times as long as greatest width, slightly broader distally, distal margin with small excavation. Merus shorter than carpus, parallel–sided. Ischium about half as long as merus. Segment ratios 0.39 (0.29–0.43): 0.58 (0.56–0.70): 1.00 (1.80–2.83) mm: 0.77 (0.66–0.82): 0.29 (0.36–0.56): – (1.06–1.33). Exopod extending to mid of merus to base of carpus.

Pereiopod 3 (fig. 19d, e) distinctly longer than pereiopod 2 and more slender 10.11 (7.12–10.21) mm long, 1.78 (1.38–1.78) times carapace length. Dactylus with prominent terminal claw and 10 (7–11) strong spines on medial margin (fig. 19e). Propodus length 4.28 (3.82–4.69) times longer than dactylus, length, 19.52 (12.10–19.52) times longer than wide with 11(10–18) spines on inner margin. Merus with 1 strong spine on medial margin and 1 near ventral distal margin; segment ratios 0.42 (0.37–0.49): 1.82 (1.61–1.88): 1.00 (1.91 [1.27– 2.00] mm): 1.91 (1.74–2.23): 0.64 (0.45–0.64): – (1.54–1.75). Exopod extends to mid to apex of merus.

Pereiopod 4 (fig. 19f, g) similar length to pereiopod 3, – (6.67–9.63) mm long, – (1.45–1.62) times carapace length. Dactylus with prominent terminal claw and – (8–11) spines on medial margin (fig. 19g). Propodus – (3.58–5.00) times longer than dactylus; length – (12.37–16.00) times longer than wide, with – (11–16) spines on inner margin; merus with 1–2 strong spine on medial margin and 1 near ventral distal margin. Segment ratios – (0.22–0.52): – (1.56–2.10): 1.00 (– [1.17– 1.92] mm): – (1.77–2.23): – (0.49–0.71): – (1.25–1.77). Exopod extends to mid merus.

Pereiopod 5 (fig. 20a, b) similar length to pereiopod 4, 9.16 (6.57–9.73) mm long, 1.62 (1.24–1.75) times carapace length. Dactylus with prominent terminal claw and very regular, comb–like row of numerous 72 (72–94) small spines on medial margin (fig. 20b). Propodus 4.09 (2.78–4.22) times longer than dactylus, length 14.08 (10.42–18.93) times longer than wide with 14 (10–14) long medial teeth, 2 distally and external margin without teeth. Carpus without any large spines near distal margin. Merus with 1 strong medial spine and 1 distal spine; segment ratios 0.45 (0.45–0.71): 1.85 (1.84–2.41): 1.00 (1.88 [1.08–1.88] mm): 1.64 (1.56–1.79): – (0.52–0.89): 1.25 (1.07–1.36). Exopod extends to basal to mid third of merus.

Abdomen. Pleopods peduncle of first pleopod short, 1.64 mm, 0.28 (0.30–0.38) times length of carapace, 1.82 (1.82– 3.08) times width, exopod 1.83 (1.06–1.83) times peduncle length, endopod 0.97 (0.42–0.97) times peduncle length (fig. 20e); second pleopod peduncle short, – (0.33–0.58) times length of carapace, – (2.50–3.88) times width, exopod – (0.91–1.35) times peduncle length, endopod slightly shorter – (0.83–1.20) times peduncle length. Length of first peduncle – (1.07–1.74) times length of second peduncle.

Telson (fig. 20c, d) length 3.67 (3.20–4.40) mm, 0.65 (0.58–0.83) times carapace length, 3.00 (2.83–3.66) times longer than greatest width, tapering distally. Dorsal surface with 2 pairs of strong submarginal teeth-like spines. Posterior margin convex with 1 pair of teeth-like spines outermost, 4 (4–10) long strong setose spines (fig. 20d).

Uropods approximately equal to telson length.

Male smaller than females, carapace length 4.9–6.0 mm; endopod of first pleopod strongly excavated apically with 8–12 external spines and 11–15 long setae on inner margin (fig. 20f, g)

Etymology: Named in honour of the late Dr Mary E. White (AM), an Australian paleobotanist and whose environmental publications are inspirational and whose generosity to us while staying at The Falls Forest Retreat (New South Wales; type locality) will be remembered always.

Comments: P. whitemae may be confused by other widespread species and is found in the same areas as P. australiensis , P. arrostra and P. tasmaniensis . It can be distinguished from all other long rostrum species by the carpus of pereiopod 1 which is long with a short, robust chelae; the rostrum is concave with ventral rostral spines extending from posterior to the greatest width, extending over a length of 1.30–2.80 mm ( Table 2).

Paratya whitemae is a widespread species in the coastal streams of Victoria, New South Wales and in south-eastern Queensland and in the Murray R in the Murray–Darling Basin (fig. 32b) and may co-exist with P. australiensis , P. arrostra , P. williamsi , P. rouxi and P. tasmaniensis at various locations throughout its range.

Figures

Figure 18. Paratya whitemae sp. nov.: a, head region and rostrum; b, antenna 1 peduncle and stylocerite; c, scaphocerite; d, left mandible; e, enlarged incisors; f, right mandible; g, enlarged incisors; h, maxilla 1; i, maxilla 2; j, maxilliped 1; k, maxilliped 2. Scale lines 0.2 mm.

Figure 19. Paratya whitemae sp. nov.: a, maxilliped 3; b, pereiopod 1; c, pereiopod 2; d, pereiopod 3; e, dactylus 3; f, pereiopod 4; g, dactylus 4. Scale lines 0.2 mm.

Figure 20. Paratya whitemae n. sp.: a, pereiopod 5; b, dactylus 5; c, telson; d, telson terminal spines; e, pleopod 1 of female; f, pleopod 1 of male; g, endopod 1 of male. Scale lines 0.2 mm.