On the Mysid Crustacean Genus Deltamysis (Mysidae: Heteromysinae), with a New Species and a New Record from Australia Author Daneliya, Mikhail E. text Records of the Australian Museum 2023 Rec. Aust. Mus. 2023-12-06 75 4 413 430 http://dx.doi.org/10.3853/j.2201-4349.75.2023.1881 journal article 296174 10.3853/j.2201-4349.75.2023.1881 2700c7a4-4131-4d51-99f4-22923ff3ee00 2201-4349 10413846

Table 1. Comparison of the diagnostic morphological characters between the species of the genus Deltamysis (unique character states indicated in bold).

characters		species (in alphabetic order)
	D. holmquistae	D. lowryi sp. nov.	D. nana	D. songkhlaensis
Anterior margin of carapace Apically rounded		Apically rounded	Apically rounded	Apically pointed or blunt
Eye cornea width / stalk width	0. 7–0.96	0.7–0.95	0.8	0.57–0.63
Telson length / width cleft presence cleft / telson length apical spinules number apical spinules length / lateral	1.1–1.3 Absent — 2 or 3 0.23–0.58	1.1–1.4 Present 0.05 7 0.09–0.25	1.5–1.6 Present 0.02 2 0.43	1.1–1.2 Absent — 2 1.0–1.1
terminal spiniform setae length
lateral terminal / subterminal	0.51–1.5	3.1–3.4	0.94	0.95–1.1
spiniform setae length subterminal / previous postero-	1.1–2.4	0.48	1.6	0.95–1.1
lateral spiniform setae length lateral terminal spiniform setae length/ telson length	0.20–0.42	0.22–0.23	0.12	0.27–0.32
Maxilla 2 exopod and endopod lateral setae Absent exopod length Barely reaching half of endopod segment 1		Absent Reaching endopod segment 2	Present Reaching half of endopod segment 1	Present Reaching endopod segment 2
Maxilliped 2 endopod carpus and propodus Present in males lateral processes		Present in males	Absent in females,? in males	Absent
Pereopod dactylus	Thick	Thin	Thin	Thick
Pereopod 3–6 carpopropodus segment number 4 segment 1 / segments 2–4 (5) Shorter combined length		4 or 5 Shorter	4 or 5 Shorter	4 Longer, as long as or only slightly shorter