Warregoensis lowryi, King & Stringer & Leijs, 2023

King, Rachael A., Stringer, Danielle N. & Leijs, Remko, 2023, Carnarvonis gen. nov. and Warregoensis gen. nov.: Two New Genera and Species of Subterranean Amphipods (Crangonyctoidea: Chillagoeidae) Described from North-eastern Australia, Records of the Australian Museum (Rec. Aust. Mus.) 75 (4), pp. 447-457 : 452-455

Warregoensis lowryi sp. nov.

urn:lsid:zoobank.org:act:D631937A-D112-46F2-8D55-E713B7E92030

Figs 4–6

Holotype: QM W29604 (RL 2296.4, Genbank CO 1: OP596266.1), male, Carnarvon Station Reserve , Lady Spring, 24.80255°S 147.8265°E, Bou-Rouch pump in gravel bank, coll. R. Leijs, 15 October 2014 . Paratypes: QM W29605 (RL 2296.3, Genbank CO 1: OP596269.1), female, Carnarvon Station Reserve , Lady Spring, 24.80255°S 147.8265°E, Bou-Rouch pump in gravel bank, coll . R. Leijs, 15 October 2014 ; SAMA C14814 (RL 2296.1, RL2296.2, Genbank CO 1: OP596268.1, OP596270.1), female and male, Carnarvon Station Reserve , Lady Spring, 24.80255°S 147.8265°E, Bou-Rouch pump in gravel bank, coll . R. Leijs, 15 October 2014 .

Description. Holotype male, 6.2 mm. Head. Without rostrum, eyes absent. Antenna 1 length greater than half length of animal; peduncle with three articles progressively shorter; accessory flagellum of two articles, distal article small; flagellum of 18 articles. Antenna 2 approximately ⅔ length of antenna 1; peduncle longer than flagellum, articles 4–5 of peduncle of subequal length; flagellum of 7 articles. Labrum (upper lip) evenly rounded, setose apically. Labium (lower lip) without inner lobes. Mandible incisor with 5 teeth, lacinia mobilis with 4 teeth, setal row of 5 plumose setae present, molar narrow and denticulate; palp of three articles, article 3 shorter than article 2, with short row of plumose setae (“D-setae”; after Lowry & Stoddart, 1993). Maxilla 1 outer plate with seven apical denticulate robust setae; inner plate with two apical plumose setae; palp of two articles, distal article longest, with apical setae. Maxilla 2 outer plate with two rows of simple and plumose setae apically and simple setae laterally; inner plate with simple setae apically and an oblique row of medial plumose setae. Maxilliped palp slender (no articles enlarged), of four articles plus spine; outer plate with robust and simple setae along apical and lateral margin; inner plate with robust and plumose setae apically and laterally.

Pereon. Gills include coxal gills on pereopods 2–7; sternal gills on thoracic segments 2–6, slender, around ½ length of coxal gills. Gnathopods 1–2 large (propodus similar length to head). Gnathopod 1 coxa short (wider than long), with robust seta at posterior corner and few simple setae scattered along margin; propodus length 1.8 times width, lateral face with distinct excavation above and parallel to palm margin, palm margins crenulate and with 2 excavations, without robust setae along palm margin, with rows of 3 mesial (inner) and 3 lateral (outer) robust setae either side of palm corner (where dactyl fits to the propodus), posterior margin of propodus with 4 oblique rows of long simple setae. Gnathopod 2 coxa longer than coxa 1, distinctly longer than wide, with robust seta at posterior corner and few simple setae scattered along margin; propodus length 2 times width, lateral face with distinct excavation above and parallel to palm margin, palm margins crenulate and with 2 excavations, without robust setae along palm margin, with rows of 3 mesial (inner) and 2 lateral (outer) robust setae either side of palm corner (where dactyl fits to the propodus), posterior margin of propodus with 5 oblique rows of long simple setae. Pereopod 3 coxa similar length to coxa 2, longer than wide, with robust seta at posterior corner and few simple setae scattered along margin. Pereopod 4 coxa similar length to coxa 2–3, longer than wide, small but distinct excavated corner on the posterior margin, with robust seta at posterior corner and few simple setae scattered along margin; dactylus with single seta. Pereopod 5 shorter than pereopods 6–7; coxa with rounded anteroventral lobe with seta, posteroventral lobe indistinct, with two setae on posterior margin; basis 1.7 times as long as wide; propodus longer than carpus; dactylus with single seta. Pereopod 6 similar length to pereopod 7; coxa with rounded anteroventral lobe, posteroventral lobe indistinct, with two setae on posterior margin; basis 1.9 times as long as wide; propodus longer than carpus; dactylus with single seta. Pereopod 7 coxa rounded, with two setae on posterior margin; basis 1.9 times as long as wide; propodus longer than carpus; dactylus with single seta.

Pleon. Epimera 1–3 posteroventrally subquadrate, posteroventral corner with robust seta and posterior margins with several small robust setae along length; epimera 2–3 with robust setae along the ventral margin. Urosomite 1 with distinct distoventral robust seta, with paired dorsolateral setae on distal margin. Urosomite 2 with paired dorsolateral setae on distal margin. Uropod 1 peduncle without basofacial robust seta, distal margin of peduncle with group of 1 large and 2 small robust setae laterally and 1 large robust seta medially. Uropod 2 distal margin of peduncle with group of 2 small robust setae laterally and 1 small robust seta medially. Uropod 3 distal margin of peduncle with robust setae laterally and medially; outer ramus of 1 article, approximately 3 times length of peduncle, with clusters of 2–3 robust setae along length; inner ramus absent. Telson cleft to 1/3 depth, with robust and simple setae apically.

Etymology. Named in honour of Dr Jim Lowry, a friend and colleague.

Remarks. Warregoensis lowryi sp. nov. is clearly a distinct species with 15% CO1 divergence from Carnarvonis katjae sp. nov. and 22% CO1 divergence from Chillagoe thea .

Figures

Figure 4. Warregoensis lowryi sp. nov., holotype male, TL 6.2 mm, Carnarvon Station Reserve, Queensland, QM W29604. (A) whole animal in lateral view; (B) maxilla 1; (C) maxilla 2; (D) mandible; (E) maxilliped; (F) lower lip; (G) upper lip. Scale (A): 0.1 mm.

Figure 5. Warregoensis lowryi sp. nov., holotype male,TL 6.2 mm, Carnarvon Station Reserve, Queensland, QM W29604.(A) gnathopod 1 with enlargement to show palm detail; (B) gnathopod 2 with enlargement to show palm detail.

Figure 6. Warregoensis lowryi sp. nov., holotype male, TL 6.2 mm, Carnarvon Station Reserve, Queensland, QM W29604. (A) pereopod 4; (B) pereopod 5; (C) pereopod 6; (D) pereopod 7; (E) uropod 1; (F) uropod 2; (G) uropod 3; (H) telson.